Pub Date : 2026-02-01Epub Date: 2025-12-20DOI: 10.1016/j.ijmst.2025.12.005
Jinguo Lyu , Zhanpeng Xue , Yishan Pan , Lianpeng Dai , Zhi Tang , Xuebin Wang
<div><div>To address the key scientific challenge of monitoring the dynamic fracturing of surrounding rock in deep roadways, this study systematically investigates the quantitative relationship between stress and charge signals during coal mass loading. By integrating innovative analytical approaches, introducing quantitative evaluation indices, and developing a charge–stress inversion model, and incorporating underground monitoring practices, significant progress has been achieved in elucidating the correlation between stress variations and charge signals throughout the entire coal mass fracturing process. First, in the field of stress–charge correlation analysis, empirical mode decomposition (EMD) was combined with wavelet coherence analysis for the first time, enabling the removal of slow-varying stress trends while retaining high-frequency fluctuations. This approach allowed for the quantitative characterization of the evolution of coherence between stress variations and charge fluctuations across multiple time scales. Second, coherence skewness and the proportion of high-coherence intervals were innovatively introduced to examine the influence of time scale selection on correlation results. On this basis, a criterion for determining the near-optimal observation scale of charge signals was proposed, providing a quantitative reference for time scale selection in similar signal analyses. Finally, by correlating charge signals with coal damage factors and stress states, a charge-based damage evolution equation was established to achieve effective stress inversion. Combined with in situ monitoring of stress and charge in roadway surrounding rock, this approach revealed the correlation characteristics of stress and charge intensity responses during the dynamic fracturing process. The results indicate, first, that charge signals are not significantly correlated with the absolute stress level of coal but are directly associated with stress variations following coal damage and failure, with the amplitude of charge fluctuations increasing alongside stress fluctuations. Second, coherence between stress and charge signals varies markedly across time scales, with excessively small or large scales leading to distortion, and the scale corresponding to the peak proportion of intervals with coherence >0.8 was identified as the near-optimal observation scale. Third, charge signals can effectively characterize coal damage factors, and the established damage evolution equation can effectively invert stress variation trends. Fourth, in underground roadways, zones of dynamic fracturing in surrounding rock are commonly located in areas where stress concentration overlaps with regions of high charge intensity, further confirming the strong consistency between charge and stress variations. These findings improve the theoretical framework of charge signal responses in loaded coal and provide a scientific basis for precise “stress-charge” monitoring of dynamic disa
{"title":"Quantitative correlation between stress variation and charge signals of loaded coal and its implication for dynamic fracturing of surrounding rock","authors":"Jinguo Lyu , Zhanpeng Xue , Yishan Pan , Lianpeng Dai , Zhi Tang , Xuebin Wang","doi":"10.1016/j.ijmst.2025.12.005","DOIUrl":"10.1016/j.ijmst.2025.12.005","url":null,"abstract":"<div><div>To address the key scientific challenge of monitoring the dynamic fracturing of surrounding rock in deep roadways, this study systematically investigates the quantitative relationship between stress and charge signals during coal mass loading. By integrating innovative analytical approaches, introducing quantitative evaluation indices, and developing a charge–stress inversion model, and incorporating underground monitoring practices, significant progress has been achieved in elucidating the correlation between stress variations and charge signals throughout the entire coal mass fracturing process. First, in the field of stress–charge correlation analysis, empirical mode decomposition (EMD) was combined with wavelet coherence analysis for the first time, enabling the removal of slow-varying stress trends while retaining high-frequency fluctuations. This approach allowed for the quantitative characterization of the evolution of coherence between stress variations and charge fluctuations across multiple time scales. Second, coherence skewness and the proportion of high-coherence intervals were innovatively introduced to examine the influence of time scale selection on correlation results. On this basis, a criterion for determining the near-optimal observation scale of charge signals was proposed, providing a quantitative reference for time scale selection in similar signal analyses. Finally, by correlating charge signals with coal damage factors and stress states, a charge-based damage evolution equation was established to achieve effective stress inversion. Combined with in situ monitoring of stress and charge in roadway surrounding rock, this approach revealed the correlation characteristics of stress and charge intensity responses during the dynamic fracturing process. The results indicate, first, that charge signals are not significantly correlated with the absolute stress level of coal but are directly associated with stress variations following coal damage and failure, with the amplitude of charge fluctuations increasing alongside stress fluctuations. Second, coherence between stress and charge signals varies markedly across time scales, with excessively small or large scales leading to distortion, and the scale corresponding to the peak proportion of intervals with coherence >0.8 was identified as the near-optimal observation scale. Third, charge signals can effectively characterize coal damage factors, and the established damage evolution equation can effectively invert stress variation trends. Fourth, in underground roadways, zones of dynamic fracturing in surrounding rock are commonly located in areas where stress concentration overlaps with regions of high charge intensity, further confirming the strong consistency between charge and stress variations. These findings improve the theoretical framework of charge signal responses in loaded coal and provide a scientific basis for precise “stress-charge” monitoring of dynamic disa","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"36 2","pages":"Pages 313-331"},"PeriodicalIF":13.7,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145784967","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}
Pub Date : 2026-02-01Epub Date: 2025-11-05DOI: 10.1016/j.ijmst.2025.09.013
Hongbin Liu, Mamadou Fall
As underground mining advances to greater depths, cemented paste backfill (CPB) is increasingly subjected to complex thermo-mechanical loading conditions, including multiaxial stress states and elevated temperatures. This study investigates the coupled effects of field-representative vertical self-weight and horizontal rockwall closure stresses, along with in-situ temperatures, on the mechanical behavior and pore water pressure (PWP) evolution of CPB. Experiments were conducted using a novel apparatus capable of controlling multiaxial stress and temperature during curing, replicating in-situ stress paths and thermal profiles typical of deep mine environments. Results show that multiaxial stress enhances CPB strength and stiffness by promoting denser particle packing, reducing porosity, and increasing frictional resistance. Elevated temperatures independently accelerate early-age cement hydration, further improving bond strength and stiffness. When combined, multiaxial stress and elevated temperature produce a synergistic enhancement in unconfined compressive strength (UCS) and elastic modulus, as confirmed by two-way ANOVA and synergy index analysis. PWP responses were also highly sensitive to thermo-mechanical conditions. The evolution of positive and negative PWP was governed by the interplay of thermal expansion, hydration-induced desaturation, and mechanical compaction. Multiaxial stress amplified early positive PWP and delayed its dissipation, whereas elevated temperature accelerated hydration and reduced pore pressure, leading to enhanced suction at later ages. A transient “stress-induced resaturation” effect was observed under late-stage excessive horizontal stress but was mitigated by elevated temperatures. These findings provide critical insights into the coupled mechanical and hydraulic behavior of CPB under realistic field conditions and offer guidance for optimizing backfill design, binder content, and barricade stability in deep mining applications.
{"title":"Mechanical response and pore pressure evolution of cemented paste backfill under deep mine-like multiaxial stress and temperature conditions","authors":"Hongbin Liu, Mamadou Fall","doi":"10.1016/j.ijmst.2025.09.013","DOIUrl":"10.1016/j.ijmst.2025.09.013","url":null,"abstract":"<div><div>As underground mining advances to greater depths, cemented paste backfill (CPB) is increasingly subjected to complex thermo-mechanical loading conditions, including multiaxial stress states and elevated temperatures. This study investigates the coupled effects of field-representative vertical self-weight and horizontal rockwall closure stresses, along with in-situ temperatures, on the mechanical behavior and pore water pressure (PWP) evolution of CPB. Experiments were conducted using a novel apparatus capable of controlling multiaxial stress and temperature during curing, replicating in-situ stress paths and thermal profiles typical of deep mine environments. Results show that multiaxial stress enhances CPB strength and stiffness by promoting denser particle packing, reducing porosity, and increasing frictional resistance. Elevated temperatures independently accelerate early-age cement hydration, further improving bond strength and stiffness. When combined, multiaxial stress and elevated temperature produce a synergistic enhancement in unconfined compressive strength (UCS) and elastic modulus, as confirmed by two-way ANOVA and synergy index analysis. PWP responses were also highly sensitive to thermo-mechanical conditions. The evolution of positive and negative PWP was governed by the interplay of thermal expansion, hydration-induced desaturation, and mechanical compaction. Multiaxial stress amplified early positive PWP and delayed its dissipation, whereas elevated temperature accelerated hydration and reduced pore pressure, leading to enhanced suction at later ages. A transient “stress-induced resaturation” effect was observed under late-stage excessive horizontal stress but was mitigated by elevated temperatures. These findings provide critical insights into the coupled mechanical and hydraulic behavior of CPB under realistic field conditions and offer guidance for optimizing backfill design, binder content, and barricade stability in deep mining applications.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"36 2","pages":"Pages 457-474"},"PeriodicalIF":13.7,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145447341","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}
Pub Date : 2026-02-01Epub Date: 2025-12-18DOI: 10.1016/j.ijmst.2025.12.006
Qingzhe Cui , Rongbin Hou , Zhenhua Li , Feng Du , Xu Chen , Boyang Zhang , Lielie Li
In deep coal mining, surrounding rock is subjected to both high in-situ stress and intense mining disturbances, leading to significant time-dependent behavior. Accurately capturing this behavior is essential for predicting long-term roadway stability, necessitating the development of a reliable constitutive creep model and numerical simulation approach. In this study, creep experiments were conducted on pre-damaged rock with varying initial damage levels to investigate the time-dependent mechanical properties. Based on the experimental results, an accelerated-creep criterion was proposed, and an elastic-viscoplastic creep damage model (EVPCD) was established that simultaneously considers the effects of time-dependent damage and instantaneous damage caused by stress disturbances on rock creep behavior. Subsequently, the effectiveness of the proposed creep model was verified using experimental data, and the secondary development of the EVPCD model was completed based on the FLAC3D platform. Following this, a long-term stability analysis method of deep surrounding rock that accounts for excavation-and mining-induced disturbances was proposed. Using the main roadway of Xutuan Coal Mine as a case study, numerical simulations were carried out to investigate the time-dependent deformation and failure characteristics of the surrounding rock following excavation and mining disturbance. Combined with on-site monitoring of the surrounding rock damage areas, the results indicate that the EVPCD outperforms the CVISC and Nishihara models in predicting the time-dependent behavior of deep surrounding rock.
{"title":"Time-dependent behavior of deep roadway surrounding rock considering damage induced by excavation and mining disturbances: Experiments, modeling, and simulation","authors":"Qingzhe Cui , Rongbin Hou , Zhenhua Li , Feng Du , Xu Chen , Boyang Zhang , Lielie Li","doi":"10.1016/j.ijmst.2025.12.006","DOIUrl":"10.1016/j.ijmst.2025.12.006","url":null,"abstract":"<div><div>In deep coal mining, surrounding rock is subjected to both high in-situ stress and intense mining disturbances, leading to significant time-dependent behavior. Accurately capturing this behavior is essential for predicting long-term roadway stability, necessitating the development of a reliable constitutive creep model and numerical simulation approach. In this study, creep experiments were conducted on pre-damaged rock with varying initial damage levels to investigate the time-dependent mechanical properties. Based on the experimental results, an accelerated-creep criterion was proposed, and an elastic-viscoplastic creep damage model (EVPCD) was established that simultaneously considers the effects of time-dependent damage and instantaneous damage caused by stress disturbances on rock creep behavior. Subsequently, the effectiveness of the proposed creep model was verified using experimental data, and the secondary development of the EVPCD model was completed based on the FLAC3D platform. Following this, a long-term stability analysis method of deep surrounding rock that accounts for excavation-and mining-induced disturbances was proposed. Using the main roadway of Xutuan Coal Mine as a case study, numerical simulations were carried out to investigate the time-dependent deformation and failure characteristics of the surrounding rock following excavation and mining disturbance. Combined with on-site monitoring of the surrounding rock damage areas, the results indicate that the EVPCD outperforms the CVISC and Nishihara models in predicting the time-dependent behavior of deep surrounding rock.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"36 2","pages":"Pages 439-456"},"PeriodicalIF":13.7,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145784969","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}
Pub Date : 2026-01-30DOI: 10.1016/j.ijmst.2026.01.005
Xiaozhao Li, Yujie Yan, Bowen Yao, Artem A. Kunitskikh, Evgenii V. Kozhevnikov, Chengzhi Qi
{"title":"Micromechanical assessment of unsaturation freezing impact on compressive fracture in brittle rocks","authors":"Xiaozhao Li, Yujie Yan, Bowen Yao, Artem A. Kunitskikh, Evgenii V. Kozhevnikov, Chengzhi Qi","doi":"10.1016/j.ijmst.2026.01.005","DOIUrl":"https://doi.org/10.1016/j.ijmst.2026.01.005","url":null,"abstract":"","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"143 1","pages":""},"PeriodicalIF":11.8,"publicationDate":"2026-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146089491","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}
Pub Date : 2026-01-24DOI: 10.1016/j.ijmst.2025.12.012
Kang Peng, Hankuo Zhang, Mao Jing, Yunge Zhao
A critical scientific gap exists in quantifying the intrinsic mechanisms of shale mechanical property degradation induced by the combined effects of perforation (impact) and acidization—two core techniques for shale reservoir permeability enhancement. To address this gap, this study proposed an innovative coupled experimental framework integrating dynamic-static cyclic loading (to simulate perforation impact) and acid erosion. Static uniaxial compression tests were performed on treated damaged shale samples, with microstructural characterization via X-ray diffraction (XRD) and scanning electron microscopy (SEM). Key findings include: (1) The damage factor (characterized by longitudinal wave velocity) showed a significant positive correlation with acid concentration; (2) Combined damage (impact + acidization) caused far more severe mechanical deterioration than single damage modes—for instance, samples under combined damage with 20% hydrochloric acid exhibited a strength reduction to 158.97 MPa, with sharp decreases in peak strength and elastic modulus; (3) Damage reduced total energy and elastic strain energy of samples while increasing dissipated energy proportion, leading to more developed internal fractures and severe failure in combined damage samples; (4) Acidization promoted sample fragmentation into smaller debris, resulting in significantly higher fractal dimensions of acidized shale than other damage types under the same acid concentration; (5) XRD and SEM analyses confirmed that high-concentration acid erosion reduced shale carbonate content, and the synergy of mechanical pre-damage and chemical dissolution in combined damage accelerated acid-rock reactions, significantly increasing micro-interfacial pores and degrading shale structural integrity. This study’s innovation lies in establishing a coupled experimental framework that reproduces the actual “perforation-acidization” sequence, quantitatively revealing the synergistic degradation mechanism of shale mechanical properties under combined damage—providing a novel theoretical basis for optimizing shale reservoir stimulation parameters.
{"title":"Effects of combined dynamic-static loading and acidic corrosion treatment on the mechanical properties and microstructure of shale","authors":"Kang Peng, Hankuo Zhang, Mao Jing, Yunge Zhao","doi":"10.1016/j.ijmst.2025.12.012","DOIUrl":"https://doi.org/10.1016/j.ijmst.2025.12.012","url":null,"abstract":"A critical scientific gap exists in quantifying the intrinsic mechanisms of shale mechanical property degradation induced by the combined effects of perforation (impact) and acidization—two core techniques for shale reservoir permeability enhancement. To address this gap, this study proposed an innovative coupled experimental framework integrating dynamic-static cyclic loading (to simulate perforation impact) and acid erosion. Static uniaxial compression tests were performed on treated damaged shale samples, with microstructural characterization via X-ray diffraction (XRD) and scanning electron microscopy (SEM). Key findings include: (1) The damage factor (characterized by longitudinal wave velocity) showed a significant positive correlation with acid concentration; (2) Combined damage (impact + acidization) caused far more severe mechanical deterioration than single damage modes—for instance, samples under combined damage with 20% hydrochloric acid exhibited a strength reduction to 158.97 MPa, with sharp decreases in peak strength and elastic modulus; (3) Damage reduced total energy and elastic strain energy of samples while increasing dissipated energy proportion, leading to more developed internal fractures and severe failure in combined damage samples; (4) Acidization promoted sample fragmentation into smaller debris, resulting in significantly higher fractal dimensions of acidized shale than other damage types under the same acid concentration; (5) XRD and SEM analyses confirmed that high-concentration acid erosion reduced shale carbonate content, and the synergy of mechanical pre-damage and chemical dissolution in combined damage accelerated acid-rock reactions, significantly increasing micro-interfacial pores and degrading shale structural integrity. This study’s innovation lies in establishing a coupled experimental framework that reproduces the actual “perforation-acidization” sequence, quantitatively revealing the synergistic degradation mechanism of shale mechanical properties under combined damage—providing a novel theoretical basis for optimizing shale reservoir stimulation parameters.","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"22 1","pages":""},"PeriodicalIF":11.8,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146047933","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}
Pub Date : 2026-01-22DOI: 10.1016/j.ijmst.2025.12.013
Zeqi Wang, Liang Yuan, Bin Hu, Bo Li, Laisheng Huang
{"title":"Quantitative calibration method for the evolution of mechanical properties of gas-containing coal under mining-induced stress and microscopic failure evaluation","authors":"Zeqi Wang, Liang Yuan, Bin Hu, Bo Li, Laisheng Huang","doi":"10.1016/j.ijmst.2025.12.013","DOIUrl":"https://doi.org/10.1016/j.ijmst.2025.12.013","url":null,"abstract":"","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"16 1","pages":""},"PeriodicalIF":11.8,"publicationDate":"2026-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146033271","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}
{"title":"Dynamic response and failure evolution of rock slope under freeze–thaw cycles based on Hilbert-Huang transform","authors":"Jinfeng Deng, Chunlei Xin, Danqing Song, Xiaoli Liu, Wenkai Feng, Yifeng Yang, Jianmin Zhang","doi":"10.1016/j.ijmst.2025.12.009","DOIUrl":"https://doi.org/10.1016/j.ijmst.2025.12.009","url":null,"abstract":"","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"128 1","pages":""},"PeriodicalIF":11.8,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146000591","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}
Pub Date : 2026-01-18DOI: 10.1016/j.ijmst.2025.12.017
Wenxi Zhu, Huafeng Deng, Linjian Ma, Mingyang Wang, Yao Xiao, Hongya Li, Lei Cheng, Wenlong Yu
{"title":"Reconstruction of pore structure and transformation of failure mode in reef limestone under MICP grouting","authors":"Wenxi Zhu, Huafeng Deng, Linjian Ma, Mingyang Wang, Yao Xiao, Hongya Li, Lei Cheng, Wenlong Yu","doi":"10.1016/j.ijmst.2025.12.017","DOIUrl":"https://doi.org/10.1016/j.ijmst.2025.12.017","url":null,"abstract":"","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"22 1","pages":""},"PeriodicalIF":11.8,"publicationDate":"2026-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995457","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}
Pub Date : 2026-01-13DOI: 10.1016/j.ijmst.2025.12.016
Hongyu Ye, Jie Li, Yuanxin Yao, Daoyi Chen, Jun Duan, Xuezhen Wu, Dayong Li, Mucong Zi
{"title":"Distinct gas production characteristics from laboratory-synthesized Class I, II, and III hydrate reservoirs: A novel thermally-segmented rotatable approach","authors":"Hongyu Ye, Jie Li, Yuanxin Yao, Daoyi Chen, Jun Duan, Xuezhen Wu, Dayong Li, Mucong Zi","doi":"10.1016/j.ijmst.2025.12.016","DOIUrl":"https://doi.org/10.1016/j.ijmst.2025.12.016","url":null,"abstract":"","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"30 1","pages":""},"PeriodicalIF":11.8,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145962554","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}
Temperature is one of the main causes of spontaneous coal combustion. To improve the flame retardant performance, CaCl2, ammonium polyphosphate (APP), and calcium phosphate (CaHP) were compounded to control the temperature response of different stages of coal spontaneous combustion through physical and chemical synergy. Simultaneous thermal analysis, thermogravimetric-Fourier infrared spectroscopy (TG-FTIR), in-situ FTIR and electron paramagnetic resonance (EPR) were used to study the multi-temperature stage synergistic inhibition of coal spontaneous combustion. The results show that the proposed method is effective. By obtaining the characteristics of the spontaneous combustion reaction stage of coal in advance, the method of configuring an appropriate composite inhibitor can effectively realize the intelligent control of the temperature response of coal spontaneous combustion. The ignition point of long-flame coal increased by 37.15 °C. The inhibition rate of the gas phase products was more than 20%, and the inhibition rate of the functional groups was more than 30%. It has a good quenching effect on free radicals and can effectively inhibit the oxidation activity of active free radicals such as ·H, ·HO, and ·O. The results provide experimental and theoretical support for the study of temperature-responsive composite flame retardants for coal with different metamorphic degrees.
{"title":"Study on the mechanism of temperature-responsive composite inhibitors in suppressing coal spontaneous combustion at different reaction stages","authors":"Yumo Wu, Guohua Chen, Dan Zhao, Jinzhang Jia, Zhihao Pang, Lingqiao Xie, Mengqiu Liu, Xinlei Xu","doi":"10.1016/j.ijmst.2025.12.015","DOIUrl":"https://doi.org/10.1016/j.ijmst.2025.12.015","url":null,"abstract":"Temperature is one of the main causes of spontaneous coal combustion. To improve the flame retardant performance, CaCl<ce:inf loc=\"post\">2</ce:inf>, ammonium polyphosphate (APP), and calcium phosphate (CaHP) were compounded to control the temperature response of different stages of coal spontaneous combustion through physical and chemical synergy. Simultaneous thermal analysis, thermogravimetric-Fourier infrared spectroscopy (TG-FTIR), in-situ FTIR and electron paramagnetic resonance (EPR) were used to study the multi-temperature stage synergistic inhibition of coal spontaneous combustion. The results show that the proposed method is effective. By obtaining the characteristics of the spontaneous combustion reaction stage of coal in advance, the method of configuring an appropriate composite inhibitor can effectively realize the intelligent control of the temperature response of coal spontaneous combustion. The ignition point of long-flame coal increased by 37.15 °C. The inhibition rate of the gas phase products was more than 20%, and the inhibition rate of the functional groups was more than 30%. It has a good quenching effect on free radicals and can effectively inhibit the oxidation activity of active free radicals such as ·H, ·HO, and ·O. The results provide experimental and theoretical support for the study of temperature-responsive composite flame retardants for coal with different metamorphic degrees.","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"21 1","pages":""},"PeriodicalIF":11.8,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145956528","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}
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