International Journal of Mining Science and Technology最新文献_第7页

High-gravity assisted coal mine gas separation based on clathrate hydrates: Implication for methane recovery 基于笼形水合物的高重力辅助煤矿瓦斯分离：对甲烷回收的启示

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-12-01 Epub Date: 2025-11-04 DOI: 10.1016/j.ijmst.2025.09.011

Qiang Zhang , Yalan Peng , Xiang Li , Yuanji Li , Zhenyuan Yin

Hydrate-based gas separation offers a promising approach for coalbed methane recovery, reaching energy conservation and emissions reduction. This study innovatively applied high-gravity technology to enhance hydrate formation in separating 25%CH₄/67%N₂/8% O₂ for achieving rapid and efficient methane recovery. Systematic investigations were conducted at 283.2 K and 3.0 MPa with tetrahydrofuran at a molar concentration of 5.56% and L-tryptophan at a mass concentration of 0.5% additives, first evaluating liquid flow rate effects (0–20 mL/min) on mixed hydrate kinetic performance and separation efficiency, followed by rotating speed optimization (0–1200 r·min⁻¹) under the optimal liquid flow rate. The high-gravity system amplified the gas–liquid contact area by ∼1155 times through cascaded liquid supply and secondary shear effects, methane molecules entered the hydrate phase rapidly under the highest driving force with the significantly intensified mass transfer. Optimal conditions (20 mL/min, 600 r·min⁻¹) yielded an exceptional initial hydrate growth rate of 58.59 mmol/(mol·h) and methane recovery of 50.76%, about 71.33 and 0.58 times higher than the static system, respectively. Gas chromatography and Raman spectrometer analyses revealed superior methane enrichment in hydrate phase at 90% gas uptake completion, with a concurrent 41.17% reduction in process duration. These findings demonstrate the efficacy of high-gravity-enhanced hydrate technology for coalbed methane separation, offering valuable insights for optimizing clean energy utilization.

水合物基气体分离是一种很有前途的煤层气回收方法，可以达到节能减排的目的。在25%CH4/67%N2/8% O2分离过程中，创新性地应用高重力技术促进水合物形成，实现了甲烷的快速高效回收。系统考察了在283.2 K和3.0 MPa条件下，四氢呋喃摩尔浓度为5.56%，l -色氨酸质量浓度为0.5%的添加剂，首先考察了液体流速（0 ~ 20 mL/min）对混合水合物动力学性能和分离效率的影响，然后在最佳液体流速下进行转速优化（0 ~ 1200 r·min−1）。高重力体系通过级联供液和二次剪切效应，将气液接触面积扩大了约1155倍，甲烷分子在最高驱动力下迅速进入水合物相，传质明显增强。最优条件为20 mL/min， 600 r·min−1，水合物初始生长速率为58.59 mmol/(mol·h)，甲烷回收率为50.76%，分别是静态体系的71.33倍和0.58倍。气相色谱和拉曼光谱仪分析显示，当气体吸收完成90%时，水合物相的甲烷富集程度较高，同时工艺时间缩短了41.17%。这些发现证明了高重力增强水合物技术在煤层气分离中的有效性，为优化清洁能源利用提供了有价值的见解。

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引用次数: 0

Water storage in underground mined-out space as a geothermal reservoir: Heat extraction performance and temperature evolution 地下采空区作为地热储层的储水：采热性能与温度演化

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-12-01 Epub Date: 2025-11-10 DOI: 10.1016/j.ijmst.2025.10.010

Cunli Zhu , Yuejin Zhou , Jixiong Zhang , Meng Li , Zhen Li

As mining depth increases, the temperature of the surrounding rock rises, drawing global attention to the potential for geothermal energy extraction from high-temperature water stored in collapsed rock masses—a prospect that offers both promise and challenges. In response, this study proposes a functional backfilling method using mining solid waste to construct a high-porosity heat extraction space. The research integrates experiments, theoretical analysis, and simulations to examine the mechanical and permeability properties of solid waste backfill materials. It further aims to elucidate how flow velocity and initial temperature influence the evolution of the temperature field and the thermal performance. Results indicate that the backfill material achieves optimal mechanical strength with a glass fiber content of 10‰ and a length of 6 mm. Furthermore, the permeability of the solid waste backfill demonstrates a quadratic relationship with both axial and confining pressure. During the recovery stage, the temperature in the heat extraction space remains lower than that of the surrounding rock, with geothermal energy being extracted via convective heat transfer between the water medium and the rock. The amount of heat extracted shows a positive correlation with the flow velocity of the water medium and a negative correlation with its initial temperature.

随着开采深度的增加，周围岩石的温度升高，从崩塌岩体中储存的高温水中提取地热能的潜力引起了全球的关注——这一前景既带来了希望，也带来了挑战。为此，本研究提出利用采矿固体废弃物构建高孔隙度抽热空间的功能回填方法。本研究将实验、理论分析和模拟相结合，对固体废物回填材料的力学性能和渗透性能进行了研究。进一步阐明了流速和初始温度对温度场演化和热性能的影响。结果表明，当玻璃纤维含量为10‰、长度为6 mm时，回填材料的机械强度最佳。此外，固体废物充填体的渗透性与轴压和围压均呈二次关系。在采热阶段，采热空间温度保持低于围岩温度，地热能通过水介质与岩石之间的对流换热提取。提取的热量与水介质的流速成正相关，与水介质的初始温度成负相关。

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引用次数: 0

Schemes comparation of layered and continuous solution mining in bedded salt formations by horizontal interconnected wells 层状盐层层状与连续溶采水平互连井方案比较

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-12-01 Epub Date: 2025-11-10 DOI: 10.1016/j.ijmst.2025.10.003

Hao Zhang , Guimin Zhang , Kai Liu , Xinghui Fu , Yinping Li , Yuxuan Liu

Salt deposits in China predominantly originate from lake deposits, characterized by thin salt beds interspersed with numerous interlayers, collectively termed bedded salt formations. Historically, the solution mining practices have adopted the layered solution mining approach, inspired by coal mining techniques. However, this approach fails to account for the unique challenges of salt solution mining. Practical implementation is inefficient, costs escalate post-construction, and cavern geometry is constrained by salt beds thickness. Additionally, resource loss in abandoned beds and stability risks in adjacent mining zones remain unresolved. This study investigates mining scheme selection for low-grade salt deposits in Huai’an Salt Basin, introducing a continuous solution mining method that traverses multiple interlayers. Through comprehensive analysis of plastic deformation in caverns and surrounding rock, volume shrinkage rates, and economic costs comparing continuous and layered solution mining approaches, the results demonstrate that: (1) In the layered solution mining with horizontal interconnected wells scheme, plastic deformation zones propagate unevenly, posing interlayer connectivity risks. Concurrently, roof subsidence and floor heave destabilize the structure; (2) the continuous solution mining with horizontal interconnected wells scheme reduces plastic deformation zones to 3.4% of cavern volume, with volumetric shrinkage below 17%, markedly improving stability; (3) Economically, the continuous solution mining scheme generates caverns 2.43 times larger than the layered solution mining, slashing unit volume costs to 41.1% while enhancing resource recovery and long-term viability. The continuous method demonstrates distinct economic advantages and achieves higher resource utilization efficiency in solution mining compared to layered mining. Furthermore, its superior cavern stability presents strong potential for large-scale implementation.

中国的盐矿主要来源于湖泊沉积，其特征是薄盐层穿插着大量的夹层，统称为层状盐层。从历史上看，溶液开采实践采用分层溶液开采方法，灵感来自煤矿开采技术。然而，这种方法无法解释盐溶液开采的独特挑战。实际实施效率低下，施工后成本上升，洞穴几何形状受盐层厚度的限制。此外，废弃地层的资源损失和邻近矿区的稳定性风险仍未得到解决。研究了淮安盐盆地低品位盐矿的开采方案选择，介绍了一种穿越多夹层的连续溶液开采方法。通过对连续与分层溶液开采方案岩洞及围岩塑性变形、体积收缩率及经济成本的综合分析，结果表明：(1)水平连井分层溶液开采方案中，塑性变形区扩展不均匀，存在层间连通性风险；同时，顶板沉陷和底鼓使结构失稳；(2)水平连井连续溶液开采方案将塑性变形区缩小至洞室体积的3.4%，体积收缩率低于17%，显著提高了稳定性；(3)从经济上看，连续溶矿方案产生的溶洞比分层溶矿方案大2.43倍，在提高资源回收率和长期生存能力的同时，将单位体积成本降低至41.1%。与分层开采相比，连续法在溶液开采中具有明显的经济优势和更高的资源利用效率。此外，其优越的洞室稳定性为大规模实施提供了强大的潜力。

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引用次数: 0

In-situ temperature- and pressure-preserved sampler for marine natural gas hydrates: Principles, techniques, and field application 海洋天然气水合物现场保温保压取样器：原理、技术和现场应用

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-12-01 Epub Date: 2025-10-25 DOI: 10.1016/j.ijmst.2025.09.002

Chenghang Fu , Le Zhao , Ling Chen , Guikang Liu , Han Wu , Mingzhu Qi , Ming Zhang , Heping Xie

Marine gas hydrates are highly sensitive to temperature and pressure fluctuations, and deviations from in-situ conditions may cause irreversible changes in phase state, microstructure, and mechanical properties. However, conventional samplers often fail to maintain sealing and thermal stability, resulting in low sampling success rates. To address these challenges, an in-situ temperature- and pressure-preserved sampler for marine applications has been developed. The experimental results indicate that the self-developed magnetically controlled pressure-preserved controller reliably achieves autonomous triggering and self-sealing, provides an initial sealing force of 83 N, and is capable of maintaining pressures up to 40 MPa. Additionally, a custom-designed intelligent temperature control chip and high-precision sensors were integrated into the sampler. Through the design of an optimized heat transfer structure, a temperature-preserved system was developed, achieving no more than a 0.3 °C rise in temperature within 2 h. The performance evaluation and sampling operations of the sampler were conducted at the Haima Cold Seep in the South China Sea, resulting in the successful recovery of hydrate maintained under in-situ pressure of 13.8 MPa and a temperature of 6.5 °C. This advancement enables the acquisition of high-fidelity hydrate samples, providing critical support for the safe exploitation and scientific analysis of marine gas hydrate resources.

海洋天然气水合物对温度和压力波动高度敏感，与原位条件的偏差可能导致相态、微观结构和力学性能的不可逆变化。然而，传统的取样器往往不能保持密封和热稳定性，导致取样成功率低。为了解决这些挑战，开发了一种用于海洋应用的原位温度和压力保存采样器。实验结果表明，自主研制的磁控保压控制器可靠地实现了自动触发和自密封，初始密封力为83 N，压力维持能力高达40 MPa。此外，在采样器中集成了定制的智能温度控制芯片和高精度传感器。通过对传热结构的优化设计，开发了保温系统，在2 h内实现升温不超过0.3℃。在南海海马冷渗进行了性能评估和取样作业，在13.8 MPa地压和6.5℃温度下成功回收水合物。这一进步使高保真水合物样品的获取成为可能，为海洋天然气水合物资源的安全开采和科学分析提供关键支持。

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引用次数: 0

Dynamic multifractal characteristics and damage evolution of granite pegmatite with varying biotite content based on acoustic emission monitoring 基于声发射监测的不同黑云母含量花岗岩伟晶岩动态多重分形特征及损伤演化

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-12-01 Epub Date: 2025-11-10 DOI: 10.1016/j.ijmst.2025.09.012

Shuowei Liu , Jianjun Zhao , Bin Shi , Qiyi Lai , Qingmiao Li , Jianxian He , Xiao Zhao , Jie Deng , Xuejin Ying

Biotite content critically influences rock mechanical behavior and threatens underground engineering stability. Uniaxial compression tests with acoustic emission (AE) monitoring were conducted on granite pegmatite samples having varying biotite content. Peak frequency distribution analysis, rise angle-average frequency (RA-AF) analysis, multifractal theory, and a dynamic multifractal algorithm were applied to explore the relationship between damage evolution and AE characteristics. Results indicate that increased biotite content reduces uniaxial compressive strength and elastic modulus, enhances plastic deformation, and increases the proportion of shear cracks. The segmented evolution of the dynamic multifractal parameter

{Δ α}_{m}

is biotite-dependent. Oscillations during the elastic phase signify localized shear crack initiation and propagation; their attenuation in the plastic phase reflects frictional closure along biotite cleavage planes, promoting elastic energy storage and delaying release. AE-based damage models and time-varying signals characterize rock damage progression. Stress concentrations around biotite minerals foster localized shear band formation, leading to concentrated shear failure at lower damage levels. Higher biotite content accelerates crack propagation, while smooth cleavage planes lower the fracture energy threshold, reducing strength and stiffness. These findings enhance understanding of biotite-influenced progressive rock damage and underpin stability monitoring and early-warning systems for underground engineering.

黑云母含量对岩石力学行为有重要影响，威胁地下工程的稳定。对不同黑云母含量的花岗伟晶岩样品进行了声发射监测的单轴压缩试验。应用峰值频率分布分析、上升角-平均频率（RA-AF）分析、多重分形理论和动态多重分形算法探讨损伤演化与声发射特征之间的关系。结果表明：增加黑云母含量降低了单轴抗压强度和弹性模量，增强了塑性变形，增加了剪切裂缝的比例；动态多重分形参数Δαm的分段演化依赖于黑云母。弹性阶段的振荡表明局部剪切裂纹的萌生和扩展；它们在塑性阶段的衰减反映了沿黑云母解理面的摩擦闭合，促进了弹性能的储存和延迟释放。基于ae的损伤模型和时变信号表征了岩石损伤过程。黑云母矿物周围的应力集中形成局部剪切带，导致较低损伤水平的集中剪切破坏。较高的黑云母含量加速了裂纹扩展，而光滑的解理面降低了断裂能阈值，降低了强度和刚度。这些发现增强了对黑云母影响的岩石渐进损伤和地下工程基础稳定性监测预警系统的认识。

{"title":"Dynamic multifractal characteristics and damage evolution of granite pegmatite with varying biotite content based on acoustic emission monitoring","authors":"Shuowei Liu , Jianjun Zhao , Bin Shi , Qiyi Lai , Qingmiao Li , Jianxian He , Xiao Zhao , Jie Deng , Xuejin Ying","doi":"10.1016/j.ijmst.2025.09.012","DOIUrl":"10.1016/j.ijmst.2025.09.012","url":null,"abstract":"<div><div>Biotite content critically influences rock mechanical behavior and threatens underground engineering stability. Uniaxial compression tests with acoustic emission (AE) monitoring were conducted on granite pegmatite samples having varying biotite content. Peak frequency distribution analysis, rise angle-average frequency (<em>RA-AF</em>) analysis, multifractal theory, and a dynamic multifractal algorithm were applied to explore the relationship between damage evolution and AE characteristics. Results indicate that increased biotite content reduces uniaxial compressive strength and elastic modulus, enhances plastic deformation, and increases the proportion of shear cracks. The segmented evolution of the dynamic multifractal parameter <span><math><mrow><msub><mrow><mi>Δ</mi><mi>α</mi></mrow><mi>m</mi></msub></mrow></math></span> is biotite-dependent. Oscillations during the elastic phase signify localized shear crack initiation and propagation; their attenuation in the plastic phase reflects frictional closure along biotite cleavage planes, promoting elastic energy storage and delaying release. AE-based damage models and time-varying signals characterize rock damage progression. Stress concentrations around biotite minerals foster localized shear band formation, leading to concentrated shear failure at lower damage levels. Higher biotite content accelerates crack propagation, while smooth cleavage planes lower the fracture energy threshold, reducing strength and stiffness. These findings enhance understanding of biotite-influenced progressive rock damage and underpin stability monitoring and early-warning systems for underground engineering.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 12","pages":"Pages 2107-2124"},"PeriodicalIF":13.7,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145492106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of reservoir temperature and water driving pressure on dynamic behavior of geothermal reservoirs under production loads 采油负荷下储层温度和水驱压力对地热储层动态特性的影响

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-12-01 Epub Date: 2025-10-25 DOI: 10.1016/j.ijmst.2025.09.004

Yide Guo , Cheng Zhai , Xibing Li , Ming Tao , Linqi Huang , Yangchun Wu

The safe and efficient development of geothermal energy is a key driver of the energy revolution and environmental governance in this century. To understand the effect of water driving pressure on drilling safety and hydraulic fracturing efficiency during the development of geothermal energy under varying reservoir temperatures, dynamic compression tests were conducted on granite samples subjected to thermal treatment (25, 100, 200, 300, 400 and 600 °C) and subsequent forced water absorption (0, 4, 8, 12 MPa) using a split Hopkinson pressure bar system. The results indicate that a higher water driving pressure exacerbates the deterioration of dynamic compressive strength with increasing temperature, while it enhances the rate dependence of dynamic compressive strength, except at 600 °C. The dynamic increase factor (DIF) of dynamic compressive strength vs. strain rate is determined by both temperature and water driving pressure. A prediction model for the deterioration of dynamic compressive strength considering reservoir temperature and water driving pressure is proposed for geothermal reservoirs. While the splitting failure of samples remains unchanged, crack density increases with increasing temperature and water driving pressure, exhibiting multiscale failure cracks parallel to the loading direction. The structure effective strength model, the wing-crack propagation model, the effect of pore water pressure on dynamic stress intensity factor, and the dynamic response of forced absorbed water can collectively reveal the response mechanisms of dynamic strength. Based on the experimental findings, implications for safe and productive geothermal energy development are discussed, with particular attention to the effect of drilling fluid leakage on wellbore stability and the impact of residual fracturing fluid after backflow on repeated fracturing. This study has important reference value for understanding dynamic wellbore stability under drilling disturbance loads and for the design of repeated dynamic hydraulic fracturing schemes in geothermal energy development.

安全高效地开发地热能是本世纪能源革命和环境治理的关键驱动力。为了解不同储层温度条件下水驱压力对地热能源开发过程中钻井安全性和水力压裂效率的影响，采用分离式霍普金森压杆系统，对花岗岩试样进行了25、100、200、300、400和600℃的热处理和0、4、8、12 MPa的强制吸水试验。结果表明：除600℃外，较高的水驱压力加剧了动抗压强度随温度升高的劣化，增强了动抗压强度的速率依赖性；动态抗压强度随应变速率的动态增长因子（DIF）由温度和水驱动压力共同决定。提出了考虑储层温度和水驱压力的地热储层动态抗压强度劣化预测模型。试样的劈裂破坏保持不变，但裂纹密度随温度和水驱动压力的升高而增大，呈现平行于加载方向的多尺度破坏裂缝。结构有效强度模型、翼裂扩展模型、孔隙水压力对动应力强度因子的影响以及强制吸水水的动态响应可以共同揭示动强度的响应机理。在此基础上，讨论了地热能源安全高效开发的意义，重点讨论了钻井液泄漏对井筒稳定性的影响以及返排后残余压裂液对重复压裂的影响。该研究对于认识钻井扰动载荷下井筒动态稳定性，以及地热能开发中重复动态水力压裂方案的设计具有重要的参考价值。

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引用次数: 0

Viscoelasticity-enhanced stability and ice-breaking performance of submerged water jet at long standoff distances 粘弹性增强水下射流远距离稳定性和破冰性能

IF 11.8 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-11-27 DOI: 10.1016/j.ijmst.2025.10.012

Hongwei Zhang, Binbin Ge, Zhaolong Ge, Qiuxu Hu, Jinming Cui, Sen Wen, Qinglin Deng

引用次数: 0

Mechanism of low-disturbance and high-pressure-retaining sampling of seafloor sediments at 10000-meter depth and its laboratory experiment and on-site sea trials 海底沉积物万米低扰动高压取样机理及室内实验和现场海试

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-11-01 Epub Date: 2025-07-01 DOI: 10.1016/j.ijmst.2025.06.001

Guangping Liu, Shanqiang Jiang, Yongping Jin, Buyan Wan, Liang Liu, Youduo Peng

Obtaining high-quality 10000-meter-deep seafloor sediment samples is the prerequisite and foundation for conducting deep-sea geological and environmental scientific research. The bottom structure of the deep seafloor is complex, and the physical and mechanical properties and disturbance resistance of sediments of different lithologies vary greatly, so the sediment sampler inevitably disturbs the sediments during the sampling process and affects the quality of the sediment samples. A new type of deep-sea sediment pressure retaining sampler is introduced, the force state and elastic–plastic state of the sampler destroying sediments are analyzed, the radial disturbance model of sediment coring based on the spherical cavity expansion theory is established, and the radius of sediments undergoing plastic deformation around the spherical holes is used as an index for evaluating the radial disturbance of sediments. The distribution of stress and strain fields in the sediments during the expansion of the spherical cavity and the influencing factors of the radius of the radially disturbed region (plastic region) are analyzed using an arithmetic example, and the influence law is analyzed. A sediment disturbance experimental platform was built indoors to simulate the sediment coring process. The radial stress field and pore water pressure of the sediment during the coring process were monitored by sensors arranged inside the sediment, and the results of indoor tests verified the correctness of the perturbation theory model. The sampler was carried aboard the deep-sea manned submersible FENDOUZHE and conducted on-site tests at depths of 9298.4 and 9142.8 m in the Kuril-Kamchatka Trench. Pressure-preserved sediment samples were retrieved, with preservation rates of 94.21% and 92.02%, respectively, which are much higher than the current technical indicator of 80% of pressure-holding ratio for deep-sea sediments. The retrieved sediments have obvious stratification characteristics and little disturbance.

获得高质量的万米深海底沉积物样品是开展深海地质环境科学研究的前提和基础。深海海底底部结构复杂，不同岩性沉积物的物理力学性能和抗扰性差异较大，因此沉积物取样器在取样过程中不可避免地会对沉积物产生扰动，影响沉积物样品的质量。介绍了一种新型深海保压取样器，分析了取样器破坏沉积物的受力状态和弹塑性状态，建立了基于球形孔洞膨胀理论的沉积物取心径向扰动模型，并以球形孔洞周围沉积物发生塑性变形的半径作为评价沉积物径向扰动的指标。通过算例分析了球腔膨胀过程中沉积物中应力场和应变场的分布以及径向扰动区（塑性区）半径的影响因素，并分析了影响规律。在室内搭建泥沙扰动实验平台，模拟泥沙取心过程。通过设置在沉积物内部的传感器对取心过程中沉积物的径向应力场和孔隙水压力进行监测，室内试验结果验证了微扰理论模型的正确性。采样器由深海载人潜水器“分斗浙”号携带，在千岛-堪察加海沟9298.4米和9142.8米深度进行了现场测试。测得压力保存沉积物样品，保存率分别为94.21%和92.02%，远高于目前深海沉积物保压率80%的技术指标。回收的沉积物具有明显的分层特征，扰动较小。

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引用次数: 0

Multi-scale damage and fracture analysis and statistical damage constitutive model of shallow coral reef limestone based on digital core 基于数字岩心的浅层珊瑚礁灰岩多尺度损伤断裂分析及统计损伤本构模型

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-11-01 Epub Date: 2025-07-19 DOI: 10.1016/j.ijmst.2025.06.010

Yingwei Zhu , Xinping Li , Zhengrong Zhou , Dengxing Qu , Fei Meng , Shaohua Hu , Wenjie Li

Coral reef limestone (CRL) constitutes a distinctive marine carbonate formation with complex mechanical properties. This study investigates the multiscale damage and fracture mechanisms of CRL through integrated experimental testing, digital core technology, and theoretical modelling. Two CRL types with contrasting mesostructures were characterized across three scales. Macroscopically, CRL-I and CRL-II exhibited mean compressive strengths of 8.46 and 5.17 MPa, respectively. Mesoscopically, CRL-I featured small-scale highly interconnected pores, whilst CRL-II developed larger stratified pores with diminished connectivity. Microscopically, both CRL matrices demonstrated remarkable similarity in mineral composition and mechanical properties. A novel voxel average-based digital core scaling methodology was developed to facilitate numerical simulation of cross-scale damage processes, revealing network-progressive failure in CRL-I versus directional-brittle failure in CRL-II. Furthermore, a damage statistical constitutive model based on digital core technology and mesoscopic homogenisation theory established quantitative relationships between microelement strength distribution and macroscopic mechanical behavior. These findings illuminate the fundamental mechanisms through which mesoscopic structure governs the macroscopic mechanical properties of CRL.

珊瑚礁灰岩（CRL）是一种独特的海相碳酸盐岩地层，具有复杂的力学性质。本研究通过实验测试、数字核心技术和理论建模相结合的方法研究了CRL的多尺度损伤与断裂机制。在三个尺度上表征了两种具有不同介观结构的CRL类型。宏观上，CRL-I和CRL-II的平均抗压强度分别为8.46和5.17 MPa。细观上，crl - 1具有小尺度的高连通孔隙，而crl - 2具有较大的层状孔隙，但连通性较差。微观上，两种CRL基质在矿物组成和力学性能上表现出显著的相似性。开发了一种新的基于体素平均的数字核心尺度方法，以促进跨尺度损伤过程的数值模拟，揭示了CRL-I的网络渐进破坏与CRL-II的方向脆性破坏。基于数字核技术和细观均质化理论的损伤统计本构模型建立了微单元强度分布与宏观力学行为之间的定量关系。这些发现阐明了细观结构支配CRL宏观力学性能的基本机制。

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引用次数: 0

A sediment sampling system for monitoring plume redeposition from deep-sea polymetallic nodule mining 用于监测深海多金属结核开采羽流再沉积的沉积物采样系统

IF 13.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology

Pub Date : 2025-11-01 Epub Date: 2025-10-04 DOI: 10.1016/j.ijmst.2025.08.010

Jiale Wu , Jiawang Chen , Xinghui Tan , Kaichuang Wang , Jianling Zhou , Zhangyong Jin , Congchi Huang , Yuan Lin , Chunsheng Wang , Junyi Yang , Shiquan Lin

The spatiotemporal characterization of plume sedimentation and microorganisms is critical for developing plume ecological monitoring model. To address the limitations of traditional methods in obtaining high-quality sediment, a novel sampling system with 6000 m operational capability and three-month endurance was developed. It is equipped with three sediment samplers, a set of formaldehyde preservation solution injection devices. The system is controlled by a low-power, timing-triggered controllers. To investigate low-disturbance rheological mechanisms, gap controlled rheological tests were conducted to optimize the structural design of the sampling and sealing assembly. Stress-controlled shear rheological tests were employed to investigate the mechanisms governing yield stress in sediments under varying temperature conditions and boundary roughness. Additionally, the coupled Eulerian-Lagrangian (CEL) method and sediment rheological constitutive models were employed to simulate tube-soil interaction dynamics and sediment disturbance. The radial heterogeneity of sediment disturbance and friction variation of the sampling tube were revealed. The tube was completely “plugged” at a penetration depth of 261 mm, providing critical data support to the penetration depth parameters. The deep-sea pressure test and South China Sea field trials demonstrated the system’s capability to collect and preserve quantitative time-series sediment samples with high fidelity.

烟柱沉积和微生物的时空特征是建立烟柱生态监测模型的关键。为了解决传统方法在获取高质量沉积物方面的局限性，开发了一种具有6000米操作能力和3个月续航时间的新型采样系统。配有沉积物取样器3台，甲醛保存液注入装置1套。该系统由低功耗定时触发控制器控制。为了研究低扰动流变机理，进行了间隙控制流变试验，以优化采样和密封组件的结构设计。采用应力控制剪切流变试验研究了不同温度条件和边界粗糙度下沉积物屈服应力的控制机制。此外，采用欧拉-拉格朗日（CEL）耦合方法和泥沙流变本构模型模拟管土相互作用动力学和泥沙扰动。揭示了沉积物扰动的径向非均质性和采样管的摩擦变化。钻进深度为261mm时，管柱完全“堵塞”，为钻进深度参数提供了关键数据支持。深海压力测试和南海现场试验表明，该系统能够高保真地收集和保存定量时间序列沉积物样品。

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