首页 > 最新文献

International Journal of Mining Science and Technology最新文献

英文 中文
A new scientific explanation to rock fracture-induced electromagnetic radiation process
IF 11.7 1区 工程技术 Q1 MINING & MINERAL PROCESSING Pub Date : 2024-11-01 DOI: 10.1016/j.ijmst.2024.11.003
Xueqiu He , Xianghui Tian , Zhenlei Li , Menghan Wei , Majid Khan , Liming Qiu , Shengquan He , Ting Ren , Hani Mitri , Dazhao Song
The electromagnetic radiation (EMR) monitoring and early warning technology has experienced decades of successful applications for worldwide coal and rock dynamic disasters, yet a fundamental model unifying physical mechanism and generation process for EMR is still lacking. The effective revealing of EMR’s mechanism is crucial for dynamic disaster control and management. With this motive, a multi-scale experimental study was conducted in the earlier stage. At the micro-scale, the charge’s existence and non-uniform distribution on rock’s micro-surface were confirmed by atomic force microscope (AFM), and deduced the relationship with load changes. At the meso-scale, the time sequence synchronization and frequency domain consistency of EMR and micro-vibration (MV) in the rock fracture under load have been confirmed. Therefore, it is inferred that the vibration of the crack surface acts as the power source of rock fracture-induced EMR, and the original charge on the crack surface and the charge generated by the new crack surface are the electrical basis of EMR. Based on the above two experimental findings, this paper proposes a new mechanism of rock fracture-induced EMR defined as the electricity-vibration coupling mechanism, stating that, the vibrating charged crack generates the EMR. Subsequently, a generation model was constructed based on vibrating charged crack clusters to elucidate this mechanism. The experimental results demonstrated that the EMR waveform calculated by the model and measured by antenna exhibited good correspondence, thereby verifying the effectiveness of the constructed EMR model. The proposal of this new mechanism and the model further clarified the EMR’s mechanism induced by rock fracture. Moreover, the inter-relationship among crack propagation, vibration, and EMR was developed by this model, which could be immensely beneficial in EMR-based identification and prediction of dynamic disasters in complex mining environments worldwide.
{"title":"A new scientific explanation to rock fracture-induced electromagnetic radiation process","authors":"Xueqiu He ,&nbsp;Xianghui Tian ,&nbsp;Zhenlei Li ,&nbsp;Menghan Wei ,&nbsp;Majid Khan ,&nbsp;Liming Qiu ,&nbsp;Shengquan He ,&nbsp;Ting Ren ,&nbsp;Hani Mitri ,&nbsp;Dazhao Song","doi":"10.1016/j.ijmst.2024.11.003","DOIUrl":"10.1016/j.ijmst.2024.11.003","url":null,"abstract":"<div><div>The electromagnetic radiation (EMR) monitoring and early warning technology has experienced decades of successful applications for worldwide coal and rock dynamic disasters, yet a fundamental model unifying physical mechanism and generation process for EMR is still lacking. The effective revealing of EMR’s mechanism is crucial for dynamic disaster control and management. With this motive, a multi-scale experimental study was conducted in the earlier stage. At the micro-scale, the charge’s existence and non-uniform distribution on rock’s micro-surface were confirmed by atomic force microscope (AFM), and deduced the relationship with load changes. At the meso-scale, the time sequence synchronization and frequency domain consistency of EMR and micro-vibration (MV) in the rock fracture under load have been confirmed. Therefore, it is inferred that the vibration of the crack surface acts as the power source of rock fracture-induced EMR, and the original charge on the crack surface and the charge generated by the new crack surface are the electrical basis of EMR. Based on the above two experimental findings, this paper proposes a new mechanism of rock fracture-induced EMR defined as the electricity-vibration coupling mechanism, stating that, the vibrating charged crack generates the EMR. Subsequently, a generation model was constructed based on vibrating charged crack clusters to elucidate this mechanism. The experimental results demonstrated that the EMR waveform calculated by the model and measured by antenna exhibited good correspondence, thereby verifying the effectiveness of the constructed EMR model. The proposal of this new mechanism and the model further clarified the EMR’s mechanism induced by rock fracture. Moreover, the inter-relationship among crack propagation, vibration, and EMR was developed by this model, which could be immensely beneficial in EMR-based identification and prediction of dynamic disasters in complex mining environments worldwide.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 11","pages":"Pages 1485-1493"},"PeriodicalIF":11.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143198115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental investigation on the macro-mechanical behavior and micromechanical damage model of Xiyu conglomerate with pores and inclusions under triaxial compression 三轴压缩下含孔隙和包裹体西峪砾岩宏观力学行为及细观力学损伤模型试验研究
IF 11.7 1区 工程技术 Q1 MINING & MINERAL PROCESSING Pub Date : 2024-11-01 DOI: 10.1016/j.ijmst.2024.10.006
Yajun Cao , Xuelei Duan , Wei Wang , Qizhi Zhu , Dengfeng Zhao , Long Jiang , Qiang Zhang
The complex and special mechanical properties of Xiyu conglomerate are of great significance to the construction of water conservancy and hydropower engineering. The crack characteristic stress, dilatancy behavior, and failure mechanism of Xiyu conglomerate collected from Momoke Water Control Project, southwestern China, were analyzed and discussed based on the experimental results of triaxial compression test and 3D X-ray computed tomography test. The results show that with increasing confining pressure, the deformation characteristics and all characteristic stresses increase monotonically, while the dilation angle and dilatancy index decrease, and exponential function model can accurately describe the evolution rule of dilatancy index with confining pressure. While the porosity is negatively correlated with confining pressure. The failure modes of Xiyu conglomerate include axial tensile cracks, shear cracks, local cross cracks and cracks around gravel. With increasing confining pressure, the failure modes transform from tension cracks to shear cracks. A non-associated micromechanical damage model considering pressure dependent matrix presenting tension-compression asymmetry is proposed and applied to Xiyu conglomerate with pores and a large number of gravels. By comparing numerical calculations and experimental results, the proposed micromechanical plastic damage model is able to describe the mechanical behavior of Xiyu conglomerate.
西峪砾岩复杂而特殊的力学性能对水利水电工程建设具有重要意义。基于三轴压缩试验和三维x射线计算机断层扫描试验结果,对莫莫克治水工程西峪砾岩的裂缝特征应力、剪胀行为及破坏机制进行了分析和探讨。结果表明:随着围压的增大,土体的变形特征和各特征应力均单调增大,而剪胀角和剪胀指数均减小,指数函数模型能较好地描述剪胀指数随围压的演化规律;孔隙度与围压呈负相关。西峪砾岩的破坏模式包括轴向拉伸裂缝、剪切裂缝、局部交叉裂缝和砾石周围裂缝。随着围压的增大,破坏模式由拉裂向剪切裂转变。提出了一种考虑拉压不对称压力依赖矩阵的非关联细观损伤模型,并将其应用于具有孔隙和大量砾石的西峪砾岩。数值计算与试验结果对比表明,所建立的微塑性损伤模型能够较好地描述西屿砾岩的力学行为。
{"title":"Experimental investigation on the macro-mechanical behavior and micromechanical damage model of Xiyu conglomerate with pores and inclusions under triaxial compression","authors":"Yajun Cao ,&nbsp;Xuelei Duan ,&nbsp;Wei Wang ,&nbsp;Qizhi Zhu ,&nbsp;Dengfeng Zhao ,&nbsp;Long Jiang ,&nbsp;Qiang Zhang","doi":"10.1016/j.ijmst.2024.10.006","DOIUrl":"10.1016/j.ijmst.2024.10.006","url":null,"abstract":"<div><div>The complex and special mechanical properties of Xiyu conglomerate are of great significance to the construction of water conservancy and hydropower engineering. The crack characteristic stress, dilatancy behavior, and failure mechanism of Xiyu conglomerate collected from Momoke Water Control Project, southwestern China, were analyzed and discussed based on the experimental results of triaxial compression test and 3D X-ray computed tomography test. The results show that with increasing confining pressure, the deformation characteristics and all characteristic stresses increase monotonically, while the dilation angle and dilatancy index decrease, and exponential function model can accurately describe the evolution rule of dilatancy index with confining pressure. While the porosity is negatively correlated with confining pressure. The failure modes of Xiyu conglomerate include axial tensile cracks, shear cracks, local cross cracks and cracks around gravel. With increasing confining pressure, the failure modes transform from tension cracks to shear cracks. A non-associated micromechanical damage model considering pressure dependent matrix presenting tension-compression asymmetry is proposed and applied to Xiyu conglomerate with pores and a large number of gravels. By comparing numerical calculations and experimental results, the proposed micromechanical plastic damage model is able to describe the mechanical behavior of Xiyu conglomerate.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 11","pages":"Pages 1529-1549"},"PeriodicalIF":11.7,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spatio-temporal evolution of pore and fracture structures in coal induced by initial damage and creep behavior: A real-time NMR-based approach
IF 11.7 1区 工程技术 Q1 MINING & MINERAL PROCESSING Pub Date : 2024-10-01 DOI: 10.1016/j.ijmst.2024.09.003
Lei Zhang , Yimeng Wang , Mingzhong Gao , Wenhao Jia , Senlin Xie , Wei Hou , Xiangyu Wang , Hao Zhang
Understanding the impact of mining disturbances and creep deformation on the macroscopic deformation and the microscopic pore and fracture structures (MPFS) of coal is paramount for ensuring the secure extraction of coal resources. This study conducts cyclic loading-unloading and creep experiments on coal using a low-field nuclear magnetic resonance (NMR) experimental apparatus which is equipped with mechanical loading units, enabling real-time monitoring the T2 spectrum. The experiments indicated that cyclic loading-unloading stress paths initiate internal damage within coal samples. Under identical creep stress conditions, coal samples with more initial damages had more substantial instantaneous deformation and creep deformation during the creep process. After undergoing nearly 35 h of staged creep, the total strains for coal samples CC01, CC02, and CC03 reach 2.160%, 2.261%, and 2.282%, respectively. In the creep stage, the peak area ratio of seepage pores and microfractures (SPM) gradually diminishes. A higher degree of initial damage leads to a more pronounced compaction trend in the SPM of coal samples. Considering the porosity evolution of SPM during the creep process, this study proposes a novel fractional derivative model for the porosity evolution of SPM. The efficacy of the proposed model in predicting porosity evolution of SPM is substantiated through experimental validation. Furthermore, an analysis of the impact mechanisms on key parameters in the model was carried out.
{"title":"Spatio-temporal evolution of pore and fracture structures in coal induced by initial damage and creep behavior: A real-time NMR-based approach","authors":"Lei Zhang ,&nbsp;Yimeng Wang ,&nbsp;Mingzhong Gao ,&nbsp;Wenhao Jia ,&nbsp;Senlin Xie ,&nbsp;Wei Hou ,&nbsp;Xiangyu Wang ,&nbsp;Hao Zhang","doi":"10.1016/j.ijmst.2024.09.003","DOIUrl":"10.1016/j.ijmst.2024.09.003","url":null,"abstract":"<div><div>Understanding the impact of mining disturbances and creep deformation on the macroscopic deformation and the microscopic pore and fracture structures (MPFS) of coal is paramount for ensuring the secure extraction of coal resources. This study conducts cyclic loading-unloading and creep experiments on coal using a low-field nuclear magnetic resonance (NMR) experimental apparatus which is equipped with mechanical loading units, enabling real-time monitoring the <em>T</em><sub>2</sub> spectrum. The experiments indicated that cyclic loading-unloading stress paths initiate internal damage within coal samples. Under identical creep stress conditions, coal samples with more initial damages had more substantial instantaneous deformation and creep deformation during the creep process. After undergoing nearly 35 h of staged creep, the total strains for coal samples CC01, CC02, and CC03 reach 2.160%, 2.261%, and 2.282%, respectively. In the creep stage, the peak area ratio of seepage pores and microfractures (SPM) gradually diminishes. A higher degree of initial damage leads to a more pronounced compaction trend in the SPM of coal samples. Considering the porosity evolution of SPM during the creep process, this study proposes a novel fractional derivative model for the porosity evolution of SPM. The efficacy of the proposed model in predicting porosity evolution of SPM is substantiated through experimental validation. Furthermore, an analysis of the impact mechanisms on key parameters in the model was carried out.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 10","pages":"Pages 1409-1425"},"PeriodicalIF":11.7,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Shear failure behaviors and degradation mechanical model of rockmass under true triaxial multi-level loading and unloading shear tests
IF 11.7 1区 工程技术 Q1 MINING & MINERAL PROCESSING Pub Date : 2024-10-01 DOI: 10.1016/j.ijmst.2024.10.002
Zhi Zheng , Ronghua Li , Pengzhi Pan , Jinghua Qi , Guoshao Su , Hong Zheng
<div><div>The redistribution of three-dimensional (3D) geostress during underground tunnel excavation can easily induce to shear failure along rockmass structural plane, potentially resulting in engineering disasters. However, the current understanding of rockmass shear behavior is mainly based on shear tests under 2D stress without lateral stress, the shear fracture under 3D stress is unclear, and the relevant 3D shear fracture theory research is deficient. Therefore, this study conducted true triaxial cyclic loading and unloading shear tests on intact and bedded limestone under different normal stress <em>σ</em><sub>n</sub> and lateral stress <em>σ</em><sub>p</sub> to investigate the shear strength, deformation, and failure characteristics. The results indicate that under different <em>σ</em><sub>n</sub> and <em>σ</em><sub>p</sub>, the stress–strain hysteresis loop area gradually increases from nearly zero in the pre-peak stage, becomes most significant in the post-peak stage, and then becomes very small in the residual stage as the number of shear test cycles increases. The shear peak strength and failure surface roughness almost linearly increase with the increase in <em>σ</em><sub>n</sub>, while they first increase and then gradually decrease as <em>σ</em><sub>p</sub> increases, with the maximum increases of 12.9% for strength and 15.1% for roughness. The shear residual strength almost linearly increases with <em>σ</em><sub>n</sub>, but shows no significant change with <em>σ</em><sub>p</sub>. Based on the acoustic emission characteristic parameters during the test process, the shear fracture process and microscopic failure mechanism were analyzed. As the shear stress <em>τ</em> increases, the acoustic emission activity, main frequency, and amplitude gradually increase, showing a significant rise during the cycle near the peak strength, while remaining almost unchanged in the residual stage. The true triaxial shear fracture process presents tensile-shear mixture failure characteristics dominated by microscopic tensile failure. Based on the test results, a 3D shear strength criterion considering the lateral stress effect was proposed, and the determination methods and evolution of the shear modulus <em>G</em>, cohesion <em>c</em><sub>jp</sub>, friction angle <em>φ</em><sub>jp</sub>, and dilation angle <em>ψ</em><sub>jp</sub> during rockmass shear fracture process were studied. Under different <em>σ</em><sub>n</sub> and <em>σ</em><sub>p</sub>, <em>G</em> first rapidly decreases and then tends to stabilize; <em>c</em><sub>jp</sub>, <em>φ</em><sub>jp</sub>, and <em>ψ</em><sub>jp</sub> first increase rapidly to the maximum value, then decrease slowly, and finally remain basically unchanged. A 3D shear mechanics model considering the effects of lateral stress and shear parameter degradation was further established, and a corresponding numerical calculation program was developed based on 3D discrete element software. The proposed model effectively s
{"title":"Shear failure behaviors and degradation mechanical model of rockmass under true triaxial multi-level loading and unloading shear tests","authors":"Zhi Zheng ,&nbsp;Ronghua Li ,&nbsp;Pengzhi Pan ,&nbsp;Jinghua Qi ,&nbsp;Guoshao Su ,&nbsp;Hong Zheng","doi":"10.1016/j.ijmst.2024.10.002","DOIUrl":"10.1016/j.ijmst.2024.10.002","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The redistribution of three-dimensional (3D) geostress during underground tunnel excavation can easily induce to shear failure along rockmass structural plane, potentially resulting in engineering disasters. However, the current understanding of rockmass shear behavior is mainly based on shear tests under 2D stress without lateral stress, the shear fracture under 3D stress is unclear, and the relevant 3D shear fracture theory research is deficient. Therefore, this study conducted true triaxial cyclic loading and unloading shear tests on intact and bedded limestone under different normal stress &lt;em&gt;σ&lt;/em&gt;&lt;sub&gt;n&lt;/sub&gt; and lateral stress &lt;em&gt;σ&lt;/em&gt;&lt;sub&gt;p&lt;/sub&gt; to investigate the shear strength, deformation, and failure characteristics. The results indicate that under different &lt;em&gt;σ&lt;/em&gt;&lt;sub&gt;n&lt;/sub&gt; and &lt;em&gt;σ&lt;/em&gt;&lt;sub&gt;p&lt;/sub&gt;, the stress–strain hysteresis loop area gradually increases from nearly zero in the pre-peak stage, becomes most significant in the post-peak stage, and then becomes very small in the residual stage as the number of shear test cycles increases. The shear peak strength and failure surface roughness almost linearly increase with the increase in &lt;em&gt;σ&lt;/em&gt;&lt;sub&gt;n&lt;/sub&gt;, while they first increase and then gradually decrease as &lt;em&gt;σ&lt;/em&gt;&lt;sub&gt;p&lt;/sub&gt; increases, with the maximum increases of 12.9% for strength and 15.1% for roughness. The shear residual strength almost linearly increases with &lt;em&gt;σ&lt;/em&gt;&lt;sub&gt;n&lt;/sub&gt;, but shows no significant change with &lt;em&gt;σ&lt;/em&gt;&lt;sub&gt;p&lt;/sub&gt;. Based on the acoustic emission characteristic parameters during the test process, the shear fracture process and microscopic failure mechanism were analyzed. As the shear stress &lt;em&gt;τ&lt;/em&gt; increases, the acoustic emission activity, main frequency, and amplitude gradually increase, showing a significant rise during the cycle near the peak strength, while remaining almost unchanged in the residual stage. The true triaxial shear fracture process presents tensile-shear mixture failure characteristics dominated by microscopic tensile failure. Based on the test results, a 3D shear strength criterion considering the lateral stress effect was proposed, and the determination methods and evolution of the shear modulus &lt;em&gt;G&lt;/em&gt;, cohesion &lt;em&gt;c&lt;/em&gt;&lt;sub&gt;jp&lt;/sub&gt;, friction angle &lt;em&gt;φ&lt;/em&gt;&lt;sub&gt;jp&lt;/sub&gt;, and dilation angle &lt;em&gt;ψ&lt;/em&gt;&lt;sub&gt;jp&lt;/sub&gt; during rockmass shear fracture process were studied. Under different &lt;em&gt;σ&lt;/em&gt;&lt;sub&gt;n&lt;/sub&gt; and &lt;em&gt;σ&lt;/em&gt;&lt;sub&gt;p&lt;/sub&gt;, &lt;em&gt;G&lt;/em&gt; first rapidly decreases and then tends to stabilize; &lt;em&gt;c&lt;/em&gt;&lt;sub&gt;jp&lt;/sub&gt;, &lt;em&gt;φ&lt;/em&gt;&lt;sub&gt;jp&lt;/sub&gt;, and &lt;em&gt;ψ&lt;/em&gt;&lt;sub&gt;jp&lt;/sub&gt; first increase rapidly to the maximum value, then decrease slowly, and finally remain basically unchanged. A 3D shear mechanics model considering the effects of lateral stress and shear parameter degradation was further established, and a corresponding numerical calculation program was developed based on 3D discrete element software. The proposed model effectively s","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 10","pages":"Pages 1385-1408"},"PeriodicalIF":11.7,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
IFC: Editorial
IF 11.7 1区 工程技术 Q1 MINING & MINERAL PROCESSING Pub Date : 2024-10-01 DOI: 10.1016/S2095-2686(24)00146-0
{"title":"IFC: Editorial","authors":"","doi":"10.1016/S2095-2686(24)00146-0","DOIUrl":"10.1016/S2095-2686(24)00146-0","url":null,"abstract":"","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 10","pages":"Page IFC"},"PeriodicalIF":11.7,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental investigation of methane explosion fracturing in bedding shales: Load characteristics and three-dimensional fracture propagation 垫层页岩中甲烷爆炸压裂的实验研究:载荷特征和三维裂缝扩展
IF 11.7 1区 工程技术 Q1 MINING & MINERAL PROCESSING Pub Date : 2024-10-01 DOI: 10.1016/j.ijmst.2024.09.010
Yu Wang , Cheng Zhai , Ting Liu , Jizhao Xu , Wei Tang , Yangfeng Zheng , Xinyu Zhu , Ning Luo
Methane in-situ explosion fracturing (MISEF) enhances permeability in shale reservoirs by detonating desorbed methane to generate detonation waves in perforations. Fracture propagation in bedding shale under varying explosion loads remains unclear. In this study, prefabricated perforated shale samples with parallel and vertical bedding are fractured under five distinct explosion loads using a MISEF experimental setup. High-frequency explosion pressure-time curves were monitored within an equivalent perforation, and computed tomography scanning along with three-dimensional reconstruction techniques were used to investigate fracture propagation patterns. Additionally, the formation mechanism and influencing factors of explosion crack-generated fines (CGF) were clarified by analyzing the morphology and statistics of explosion debris particles. The results indicate that methane explosion generated oscillating-pulse loads within perforations. Explosion characteristic parameters increase with increasing initial pressure. Explosion load and bedding orientation significantly influence fracture propagation patterns. As initial pressure increases, the fracture mode transitions from bi-wing to 4–5 radial fractures. In parallel bedding shale, radial fractures noticeably deflect along the bedding surface. Vertical bedding facilitates the development of transverse fractures oriented parallel to the cross-section. Bifurcation-merging of explosion-induced fractures generated CGF. CGF mass and fractal dimension increase, while average particle size decreases with increasing explosion load. This study provides valuable insights into MISEF technology.
甲烷原位爆炸压裂(MISEF)通过引爆解吸甲烷在射孔中产生爆震波来提高页岩储层的渗透率。不同爆炸载荷作用下层理页岩的裂缝扩展尚不清楚。在这项研究中,使用MISEF实验装置,在五种不同的爆炸载荷下,对平行和垂直层理预制多孔页岩样品进行了压裂。在等效射孔内监测高频爆炸压力-时间曲线,并使用计算机断层扫描和三维重建技术来研究裂缝扩展模式。此外,通过对爆炸碎片颗粒形貌和统计数据的分析,阐明了爆炸裂纹生成细粒的形成机理和影响因素。结果表明,甲烷爆炸在射孔内产生振荡脉冲载荷。爆炸特性参数随初始压力的增大而增大。爆炸载荷和层理方向对裂缝扩展模式有显著影响。随着初始压力的增大,裂缝模式由双翼裂缝转变为4-5径向裂缝。在平行层理页岩中,径向裂缝沿层理面明显偏转。垂向层理有利于平行于剖面的横向裂缝发育。爆炸裂缝分岔合并产生CGF。随着爆炸载荷的增加,CGF质量和分形维数增大,平均粒径减小。这项研究为MISEF技术提供了有价值的见解。
{"title":"Experimental investigation of methane explosion fracturing in bedding shales: Load characteristics and three-dimensional fracture propagation","authors":"Yu Wang ,&nbsp;Cheng Zhai ,&nbsp;Ting Liu ,&nbsp;Jizhao Xu ,&nbsp;Wei Tang ,&nbsp;Yangfeng Zheng ,&nbsp;Xinyu Zhu ,&nbsp;Ning Luo","doi":"10.1016/j.ijmst.2024.09.010","DOIUrl":"10.1016/j.ijmst.2024.09.010","url":null,"abstract":"<div><div>Methane in-situ explosion fracturing (MISEF) enhances permeability in shale reservoirs by detonating desorbed methane to generate detonation waves in perforations. Fracture propagation in bedding shale under varying explosion loads remains unclear. In this study, prefabricated perforated shale samples with parallel and vertical bedding are fractured under five distinct explosion loads using a MISEF experimental setup. High-frequency explosion pressure-time curves were monitored within an equivalent perforation, and computed tomography scanning along with three-dimensional reconstruction techniques were used to investigate fracture propagation patterns. Additionally, the formation mechanism and influencing factors of explosion crack-generated fines (CGF) were clarified by analyzing the morphology and statistics of explosion debris particles. The results indicate that methane explosion generated oscillating-pulse loads within perforations. Explosion characteristic parameters increase with increasing initial pressure. Explosion load and bedding orientation significantly influence fracture propagation patterns. As initial pressure increases, the fracture mode transitions from bi-wing to 4–5 radial fractures. In parallel bedding shale, radial fractures noticeably deflect along the bedding surface. Vertical bedding facilitates the development of transverse fractures oriented parallel to the cross-section. Bifurcation-merging of explosion-induced fractures generated CGF. CGF mass and fractal dimension increase, while average particle size decreases with increasing explosion load. This study provides valuable insights into MISEF technology.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 10","pages":"Pages 1365-1383"},"PeriodicalIF":11.7,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research progress on the adaptability of lunar regolith simulant-based composites and lunar base construction methods
IF 11.7 1区 工程技术 Q1 MINING & MINERAL PROCESSING Pub Date : 2024-10-01 DOI: 10.1016/j.ijmst.2024.09.005
Bo Liu , Peng Sun , Wei Yao , Tao Li , Wei Xu
The development and utilization of lunar resources are entering a critical stage. Immediate focus is needed on key technologies for in-situ resource utilization (ISRU) and lunar base construction. This paper comparatively analyzes the basic characteristics of lunar regolith samples returned from Chang’e-5 (CE-5), Apollo, and Luna missions, focusing on their physical, mechanical, mineral, chemical, and morphological parameters. Given the limited availability of lunar regolith, more than 50 lunar regolith simulants are summarized. The differences between lunar regolith and simulants concerning these parameters are discussed. To facilitate the construction of lunar bases, this article summarizes the advancements in research on construction materials derived from lunar regolith simulants. Based on statistical results, lunar regolith simulant-based composites are classified into 5 types by their strengthening and toughening mechanisms, and a comprehensive analysis of molding methods, preparation conditions, and mechanical properties is conducted. Furthermore, the potential lunar base construction forms are reviewed, and the adaptability of lunar regolith simulant-based composites and lunar base construction methods are proposed. The key demands of lunar bases constructed with lunar regolith-based composites are discussed, including energy demand, in-situ buildability, service performance, and structural availability. This progress contributes to providing essential material and methodological support for future lunar construction.
{"title":"Research progress on the adaptability of lunar regolith simulant-based composites and lunar base construction methods","authors":"Bo Liu ,&nbsp;Peng Sun ,&nbsp;Wei Yao ,&nbsp;Tao Li ,&nbsp;Wei Xu","doi":"10.1016/j.ijmst.2024.09.005","DOIUrl":"10.1016/j.ijmst.2024.09.005","url":null,"abstract":"<div><div>The development and utilization of lunar resources are entering a critical stage. Immediate focus is needed on key technologies for in-situ resource utilization (ISRU) and lunar base construction. This paper comparatively analyzes the basic characteristics of lunar regolith samples returned from Chang’e-5 (CE-5), Apollo, and Luna missions, focusing on their physical, mechanical, mineral, chemical, and morphological parameters. Given the limited availability of lunar regolith, more than 50 lunar regolith simulants are summarized. The differences between lunar regolith and simulants concerning these parameters are discussed. To facilitate the construction of lunar bases, this article summarizes the advancements in research on construction materials derived from lunar regolith simulants. Based on statistical results, lunar regolith simulant-based composites are classified into 5 types by their strengthening and toughening mechanisms, and a comprehensive analysis of molding methods, preparation conditions, and mechanical properties is conducted. Furthermore, the potential lunar base construction forms are reviewed, and the adaptability of lunar regolith simulant-based composites and lunar base construction methods are proposed. The key demands of lunar bases constructed with lunar regolith-based composites are discussed, including energy demand, in-situ buildability, service performance, and structural availability. This progress contributes to providing essential material and methodological support for future lunar construction.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 10","pages":"Pages 1341-1363"},"PeriodicalIF":11.7,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electromagnetic radiation of granite under dynamic compression
IF 11.7 1区 工程技术 Q1 MINING & MINERAL PROCESSING Pub Date : 2024-10-01 DOI: 10.1016/j.ijmst.2024.09.006
Juncheng Li , Qingming Zhang , Zhixiang Liu , Renrong Long , Xianzhe Zhong , Wenjin Liu , Mingze Wu , Xin Hu , Jinlong Xu , Jiankang Ren , Wei Wei , Qiang Liu , Keqin Zheng , Haozhe Liang
To elucidate the characteristics and mechanism of electromagnetic radiation in granite under impact loading, based on the quasi-static compression tests, this paper conducts dynamic compression experiments on granite using Hopkinson pressure bar and one-stage light-gas gun as loading methods. Combined with experimental and theoretical analyses, the relationship between mechanical and electromagnetic responses under impact loads of different intensities, and the time-domain signals of electromagnetic radiation generated by a single crack under different strain rates are studied. The intensity and frequency of electromagnetic radiation increase with the increasing compressive strain rate. According to the thermal activation theory, it reveals the microscopic mechanism of the transition from intergranular microcracks to transgranular microcracks in terms of strain sensitivity. It also serves as the physical basis for the increase in electromagnetic radiation intensity amplitude and frequency with increasing compressive strain rate. Transgranular microcracks are the primary cause of electromagnetic radiation generated by fractures.
{"title":"Electromagnetic radiation of granite under dynamic compression","authors":"Juncheng Li ,&nbsp;Qingming Zhang ,&nbsp;Zhixiang Liu ,&nbsp;Renrong Long ,&nbsp;Xianzhe Zhong ,&nbsp;Wenjin Liu ,&nbsp;Mingze Wu ,&nbsp;Xin Hu ,&nbsp;Jinlong Xu ,&nbsp;Jiankang Ren ,&nbsp;Wei Wei ,&nbsp;Qiang Liu ,&nbsp;Keqin Zheng ,&nbsp;Haozhe Liang","doi":"10.1016/j.ijmst.2024.09.006","DOIUrl":"10.1016/j.ijmst.2024.09.006","url":null,"abstract":"<div><div>To elucidate the characteristics and mechanism of electromagnetic radiation in granite under impact loading, based on the quasi-static compression tests, this paper conducts dynamic compression experiments on granite using Hopkinson pressure bar and one-stage light-gas gun as loading methods. Combined with experimental and theoretical analyses, the relationship between mechanical and electromagnetic responses under impact loads of different intensities, and the time-domain signals of electromagnetic radiation generated by a single crack under different strain rates are studied. The intensity and frequency of electromagnetic radiation increase with the increasing compressive strain rate. According to the thermal activation theory, it reveals the microscopic mechanism of the transition from intergranular microcracks to transgranular microcracks in terms of strain sensitivity. It also serves as the physical basis for the increase in electromagnetic radiation intensity amplitude and frequency with increasing compressive strain rate. Transgranular microcracks are the primary cause of electromagnetic radiation generated by fractures.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 10","pages":"Pages 1427-1441"},"PeriodicalIF":11.7,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Crystal structure transformation and lattice impurities migration of quartz during chlorine roasting
IF 11.7 1区 工程技术 Q1 MINING & MINERAL PROCESSING Pub Date : 2024-10-01 DOI: 10.1016/j.ijmst.2024.09.004
Wenda Guo , Haolong Lu , Zhenyue Zhang , Ling Jiang , Hanjun Wu , Defeng Liu , Ruan Chi
To investigate the effect of chlorine roasting on the migration and removal of trace elements in quartz lattice, firstly, an efficient pretreatment process, grinding–HCl washing–flotation–HF and HCl leaching, was used to remove the gangue minerals in quartz ore to obtain purified quartz for the preparation of high-purity quartz and the investigation of lattice impurities migration. The results showed that the high-purity quartz with total impurities less than 50 μg/g could be obtained from purified quartz after being treated with chlorine at 1200 °C. The variation of crystal structure and the lattice impurities migration of quartz during chlorine roasting were studied through in-situ XRD, TGA, SEM-EDS, ICP-MS, FT-IR and XPS analysis. It revealed that the decomposable impurities H2O, −OH, and residual collectors in the crystal of purified quartz could be effectively removed through chlorine roasting above 900 °C, which also had an obvious effect on the removal of low-valence trace elements Li, Na and K in the crystal of quartz but didn’t affect the multivalent trace elements Al and Ti. This study revealed the removal and migration mechanism of the trace elements in quartz crystal during chlorine roasting.
{"title":"Crystal structure transformation and lattice impurities migration of quartz during chlorine roasting","authors":"Wenda Guo ,&nbsp;Haolong Lu ,&nbsp;Zhenyue Zhang ,&nbsp;Ling Jiang ,&nbsp;Hanjun Wu ,&nbsp;Defeng Liu ,&nbsp;Ruan Chi","doi":"10.1016/j.ijmst.2024.09.004","DOIUrl":"10.1016/j.ijmst.2024.09.004","url":null,"abstract":"<div><div>To investigate the effect of chlorine roasting on the migration and removal of trace elements in quartz lattice, firstly, an efficient pretreatment process, grinding–HCl washing–flotation–HF and HCl leaching, was used to remove the gangue minerals in quartz ore to obtain purified quartz for the preparation of high-purity quartz and the investigation of lattice impurities migration. The results showed that the high-purity quartz with total impurities less than 50 μg/g could be obtained from purified quartz after being treated with chlorine at 1200 °C. The variation of crystal structure and the lattice impurities migration of quartz during chlorine roasting were studied through in-situ XRD, TGA, SEM-EDS, ICP-MS, FT-IR and XPS analysis. It revealed that the decomposable impurities H<sub>2</sub>O, −OH, and residual collectors in the crystal of purified quartz could be effectively removed through chlorine roasting above 900 °C, which also had an obvious effect on the removal of low-valence trace elements Li, Na and K in the crystal of quartz but didn’t affect the multivalent trace elements Al and Ti. This study revealed the removal and migration mechanism of the trace elements in quartz crystal during chlorine roasting.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 10","pages":"Pages 1465-1474"},"PeriodicalIF":11.7,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exploring the mechanism of a novel cationic surfactant in bastnaesite flotation via the integration of DFT calculations, in-situ AFM and electrochemistry
IF 11.7 1区 工程技术 Q1 MINING & MINERAL PROCESSING Pub Date : 2024-10-01 DOI: 10.1016/j.ijmst.2024.09.007
Chang Liu , Longhua Xu , Jiushuai Deng , Zhiguo Han , Yi Li , Jiahui Wu , Jia Tian , Donghui Wang , Kai Xue , Jinmei Fang
Effectively separating bastnaesite from calcium-bearing gangue minerals (particularly calcite) presents a formidable challenge, making the development of efficient collectors crucial. To achieve this, we have designed and synthesized a novel, highly efficient, water-soluble cationic collector, N-dodecyl-isopropanolamine (NDIA), for use in the bastnaesite-calcite flotation process. Density functional theory (DFT) calculations identified the amine nitrogen atom in NDIA as the site most susceptible to electrophilic attack and electron loss. By introducing an OH group into the traditional collector dodecylamine (DDA) structure, NDIA provided additional adsorption sites, enabling synergistic adsorption on the surface of bastnaesite, thereby significantly enhancing both the floatability and selectivity of these minerals. The recovery of bastnaesite was 76.02%, while the calcite was 1.26%. The NDIA markedly affected the zeta potential of bastnaesite, while its impact on calcite was relatively minor. Detailed Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) results elucidated that the ―NH― and ―OH groups in NDIA anchored onto the bastnaesite surface through robust electrostatic and hydrogen bonding interactions, thereby enhancing bastnaesite’s affinity for NDIA. Furthermore, in situ atomic force microscopy (AFM) provided conclusive evidence of NDIA aggregation on the bastnaesite surface, improving contact angle and hydrophobicity, and significantly boosting the flotation recovery of bastnaesite.
{"title":"Exploring the mechanism of a novel cationic surfactant in bastnaesite flotation via the integration of DFT calculations, in-situ AFM and electrochemistry","authors":"Chang Liu ,&nbsp;Longhua Xu ,&nbsp;Jiushuai Deng ,&nbsp;Zhiguo Han ,&nbsp;Yi Li ,&nbsp;Jiahui Wu ,&nbsp;Jia Tian ,&nbsp;Donghui Wang ,&nbsp;Kai Xue ,&nbsp;Jinmei Fang","doi":"10.1016/j.ijmst.2024.09.007","DOIUrl":"10.1016/j.ijmst.2024.09.007","url":null,"abstract":"<div><div>Effectively separating bastnaesite from calcium-bearing gangue minerals (particularly calcite) presents a formidable challenge, making the development of efficient collectors crucial. To achieve this, we have designed and synthesized a novel, highly efficient, water-soluble cationic collector, N-dodecyl-isopropanolamine (NDIA), for use in the bastnaesite-calcite flotation process. Density functional theory (DFT) calculations identified the amine nitrogen atom in NDIA as the site most susceptible to electrophilic attack and electron loss. By introducing an OH group into the traditional collector dodecylamine (DDA) structure, NDIA provided additional adsorption sites, enabling synergistic adsorption on the surface of bastnaesite, thereby significantly enhancing both the floatability and selectivity of these minerals. The recovery of bastnaesite was 76.02%, while the calcite was 1.26%. The NDIA markedly affected the zeta potential of bastnaesite, while its impact on calcite was relatively minor. Detailed Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) results elucidated that the ―NH― and ―OH groups in NDIA anchored onto the bastnaesite surface through robust electrostatic and hydrogen bonding interactions, thereby enhancing bastnaesite’s affinity for NDIA. Furthermore, in situ atomic force microscopy (AFM) provided conclusive evidence of NDIA aggregation on the bastnaesite surface, improving contact angle and hydrophobicity, and significantly boosting the flotation recovery of bastnaesite.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"34 10","pages":"Pages 1475-1484"},"PeriodicalIF":11.7,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
International Journal of Mining Science and Technology
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1