International Journal of Mining Science and Technology最新文献

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A novel coal-rock recognition method in coal mining face based on fusing laser point cloud and images 基于激光点云和图像融合的采煤工作面煤岩识别新方法
IF 13.7 1区 工程技术
International Journal of Mining Science and Technology Pub Date : 2025-07-01 DOI: 10.1016/j.ijmst.2025.05.009
Yang Liu , Lei Si , Zhongbin Wang , Miao Chen , Xin Li , Dong Wei , Jinheng Gu
{"title":"A novel coal-rock recognition method in coal mining face based on fusing laser point cloud and images","authors":"Yang Liu ,&nbsp;Lei Si ,&nbsp;Zhongbin Wang ,&nbsp;Miao Chen ,&nbsp;Xin Li ,&nbsp;Dong Wei ,&nbsp;Jinheng Gu","doi":"10.1016/j.ijmst.2025.05.009","DOIUrl":"10.1016/j.ijmst.2025.05.009","url":null,"abstract":"<div><div>Rapid and accurate recognition of coal and rock is an important prerequisite for safe and efficient coal mining. In this paper, a novel coal-rock recognition method is proposed based on fusing laser point cloud and images, named Multi-Modal Frustum PointNet (MMFP). Firstly, MobileNetV3 is used as the backbone network of Mask R-CNN to reduce the network parameters and compress the model volume. The dilated convolutional block attention mechanism (Dilated CBAM) and inception structure are combined with MobileNetV3 to further enhance the detection accuracy. Subsequently, the 2D target candidate box is calculated through the improved Mask R-CNN, and the frustum point cloud in the 2D target candidate box is extracted to reduce the calculation scale and spatial search range. Then, the self-attention PointNet is constructed to segment the fused point cloud within the frustum range, and the bounding box regression network is used to predict the bounding box parameters. Finally, an experimental platform of shearer coal wall cutting is established, and multiple comparative experiments are conducted. Experimental results indicate that the proposed coal-rock recognition method is superior to other advanced models.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 7","pages":"Pages 1057-1071"},"PeriodicalIF":13.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515519","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
Large system study of chalcopyrite and pyrite flotation surfaces based on SCC-DFTB parameterization method 基于SCC-DFTB参数化方法的黄铜矿和黄铁矿浮选面大系统研究
IF 13.7 1区 工程技术
International Journal of Mining Science and Technology Pub Date : 2025-07-01 DOI: 10.1016/j.ijmst.2025.06.004
Jianhua Chen , Yibing Zhang
{"title":"Large system study of chalcopyrite and pyrite flotation surfaces based on SCC-DFTB parameterization method","authors":"Jianhua Chen ,&nbsp;Yibing Zhang","doi":"10.1016/j.ijmst.2025.06.004","DOIUrl":"10.1016/j.ijmst.2025.06.004","url":null,"abstract":"<div><div>In recent years, the study of chalcopyrite and pyrite flotation surfaces using computational chemistry methods has made significant progress. However, current computational methods are limited by the small size of their systems and insufficient consideration of hydration and temperature effects, making it difficult to fully replicate the real flotation environment of chalcopyrite and pyrite. In this study, we employed the self-consistent charge density functional tight-binding (SCC-DFTB) parameterization method to develop a parameter set, CuFeOrg, which includes the interactions between Cu-Fe-C-H-O-N-S-P-Zn elements, to investigate the surface interactions in large-scale flotation systems of chalcopyrite and pyrite. The results of bulk modulus, atomic displacement, band structure, surface relaxation, surface Mulliken charge distribution, and adsorption tests of typical flotation reagents on mineral surfaces demonstrate that CuFeOrg achieves DFT-level accuracy while significantly outperforming DFT in computational efficiency. By constructing large-scale hydration systems of mineral surfaces, as well as large-scale systems incorporating the combined interactions of mineral surfaces, flotation reagents, and hydration, we more realistically reproduce the actual flotation environment. Furthermore, the dynamic analysis results are consistent with mineral surface contact angle experiments. Additionally, CuFeOrg lays the foundation for future studies of more complex and diverse chalcopyrite and pyrite flotation surface systems.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 7","pages":"Pages 1037-1055"},"PeriodicalIF":13.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144613364","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
Geothermal energy production potential of karst geothermal reservoir considering mining-induced stress 考虑采动应力的岩溶地热储层地热能生产潜力
IF 13.7 1区 工程技术
International Journal of Mining Science and Technology Pub Date : 2025-07-01 DOI: 10.1016/j.ijmst.2025.06.003
Jinghong Yan , Dan Ma , Xuefeng Gao , Hongyu Duan , Qiang Li , Wentao Hou
{"title":"Geothermal energy production potential of karst geothermal reservoir considering mining-induced stress","authors":"Jinghong Yan ,&nbsp;Dan Ma ,&nbsp;Xuefeng Gao ,&nbsp;Hongyu Duan ,&nbsp;Qiang Li ,&nbsp;Wentao Hou","doi":"10.1016/j.ijmst.2025.06.003","DOIUrl":"10.1016/j.ijmst.2025.06.003","url":null,"abstract":"<div><div>Developing hydrothermal resources in highly conductive karst aquifers at deep mine floors is regarded as a potential approach to achieving the co-development of coal and geothermal resources. However, the heat transfer potential of the fracture system in the target reservoir under mining activities remains in suspense. Hence, a coupled thermal–hydraulic-mechanical model was developed for the karst reservoir of Anju coal mine in China, considering non-isothermal convective heat transfer in fractures. This model examined the influence of stress redistribution due to different mining distances (MD) on the effective flow channel length/density and the high/low-aperture fracture distribution. The dynamic heat generation characteristics of the geothermal reservoir were evaluated. Key findings include: Mining-induced stress creates interlaced high-aperture and low-aperture fracture zones below the goaf. Within these interlaced zones, the combined effect of high- and low-aperture fractures restricts the effective flow channel length/density of the fracture network. This contraction of the flow field leads to a significant decline in production flow rate, which consequently reduces both the production flow rate and power as MD increases. This work represents the study of mining disturbances on geothermal production, providing a theoretical foundation for the co-development of coal and geothermal resources.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 7","pages":"Pages 1153-1170"},"PeriodicalIF":13.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144613367","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
Enhancing performance of mining phenolic filling materials by tailoring closed cell morphology with fly ash geopolymer 粉煤灰地聚合物裁剪闭孔形态,提高矿用酚醛充填材料性能
IF 13.7 1区 工程技术
International Journal of Mining Science and Technology Pub Date : 2025-07-01 DOI: 10.1016/j.ijmst.2025.06.008
Yi Zhang , Xiaotian Nan , Sitong Zhang , Lan Jia , Fengbo Zhu , Wenwen Yu , Qiang Zheng
{"title":"Enhancing performance of mining phenolic filling materials by tailoring closed cell morphology with fly ash geopolymer","authors":"Yi Zhang ,&nbsp;Xiaotian Nan ,&nbsp;Sitong Zhang ,&nbsp;Lan Jia ,&nbsp;Fengbo Zhu ,&nbsp;Wenwen Yu ,&nbsp;Qiang Zheng","doi":"10.1016/j.ijmst.2025.06.008","DOIUrl":"10.1016/j.ijmst.2025.06.008","url":null,"abstract":"<div><div>Phenolic foam (PF) has attracted growing attention in plugging areas due to its lightweight, flame retardancy and high fillability, yet its friable character and high reaction temperature severely weaken its potentials toward practical coal mining applications. Herein, a novel phenolic composite material filled with modified fly ash (MFA) geopolymer has been proposed to address the above issues. By modifying fly ash (FA) particles with siloxanes, robust interfacial bonding between the organic PF polymer and inorganic geopolymer network has been established, which enables modulation of their micro-morphologies to optimize their macro performances. The foam structure of PF evolves from an open-cell to a closed-cell morphology with the incorporation of MFA, leading to a decreased pulverization ratio (41%) while enhanced mechanical properties (15%). Compared with neat PF, the composite exhibits faster gelation dynamics during curing, with a maximum reaction temperature as low as only 40 °C. PF/MFA composite show high reliability against gas leakage during a laboratory designed coal mine plugging test. Furthermore, the formation of a silica hybrid char layer with higher graphitization degree and a multiple continuous closed-cell structure following the combustion of PF/MFA effectively inhibits the release of combustible volatiles and toxic gases. It is provided that this strategy of geopolymer filled polymer cross-linking networks with tunable morphology opens up an avenue for advanced mining phenolic filling materials.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 7","pages":"Pages 1197-1210"},"PeriodicalIF":13.7,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144613350","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
Deterministic cascade evolution in coal and gas outbursts: From early acoustic signatures to system-wide failure 煤和瓦斯突出的确定性级联演化:从早期声学特征到全系统失效
IF 11.7 1区 工程技术
International Journal of Mining Science and Technology Pub Date : 2025-06-01 DOI: 10.1016/j.ijmst.2025.05.003
Yang Lei , Zhijie Wen , Liang Wang , Ting Ren , Yujun Zuo
{"title":"Deterministic cascade evolution in coal and gas outbursts: From early acoustic signatures to system-wide failure","authors":"Yang Lei ,&nbsp;Zhijie Wen ,&nbsp;Liang Wang ,&nbsp;Ting Ren ,&nbsp;Yujun Zuo","doi":"10.1016/j.ijmst.2025.05.003","DOIUrl":"10.1016/j.ijmst.2025.05.003","url":null,"abstract":"<div><div>Coal and gas outbursts constitute a critical hazard in underground mining operations, characterized by rapid transitions from localized instability to catastrophic failure. Understanding the relationship between initial characteristics and final outburst scale remains a fundamental challenge in geomechanics. This study conceptualizes outbursts as deterministic cascade systems through integrated physical simulations combining high-sensitivity infrasound monitoring with energy analysis under controlled gas pressure (0.5–1.0 MPa) and confining stress (5–10 MPa) conditions. Our complementary analytical algorithms—the absolute amplitude integral and predominant period function—revealed characteristic step-wise patterns in outburst development. Quantitative analysis established a robust correlation (<em>R</em><sup>2</sup>=0.91) between initial acoustic response and final outburst intensity. Energy analysis demonstrated that gas expansion dominates the outburst process (91.81%–99.09% of total energy), with desorption gas contributing 59.1%–77.7%. Time-frequency analysis showed systematic frequency migration from high (12–15 Hz) to low (4–8 Hz) bands during outburst progression, reflecting hierarchical spatial scale expansion. The concentrated energy release (&gt;20% of total) within initial 0.2 s provides a mechanistic basis for the deterministic nature of outburst evolution. These mechanistic insights establish a quantitative framework for developing physics-based monitoring protocols and risk assessment methodologies applicable to underground coal mining operations.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 6","pages":"Pages 975-987"},"PeriodicalIF":11.7,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337684","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
Synergistic mechanisms of steel slag, granulated blast furnace slag, and desulfurization gypsum in high-content steel slag-based cementitious backfill materials 钢渣、粒状高炉渣、脱硫石膏在高掺量钢渣基胶凝回填材料中的协同作用机理
IF 11.7 1区 工程技术
International Journal of Mining Science and Technology Pub Date : 2025-06-01 DOI: 10.1016/j.ijmst.2025.05.007
Jianshuai Hao , Zihan Zhou , Zhonghui Chen , Yanjun Shen , Kuizhen Fang , Fei Tang , Fengyang Xin , Lingfei Zhang
{"title":"Synergistic mechanisms of steel slag, granulated blast furnace slag, and desulfurization gypsum in high-content steel slag-based cementitious backfill materials","authors":"Jianshuai Hao ,&nbsp;Zihan Zhou ,&nbsp;Zhonghui Chen ,&nbsp;Yanjun Shen ,&nbsp;Kuizhen Fang ,&nbsp;Fei Tang ,&nbsp;Fengyang Xin ,&nbsp;Lingfei Zhang","doi":"10.1016/j.ijmst.2025.05.007","DOIUrl":"10.1016/j.ijmst.2025.05.007","url":null,"abstract":"<div><div>In the steel slag-based mine backfill cementitious material systems, the hydration reaction mechanisms and synergistic effects of steel slag (SS), granulated blast furnace slag (GBFS), and desulfurization gypsum (DG) are crucial for performance optimization and regulation. However, existing studies have yet to fully reveal the underlying synergistic mechanisms, which limits the application and promotion of high SS content in mine backfill and low-carbon building materials. This study systematically explores the synergistic effects between various solid wastes and their regulation of the hydration process in the SS-based cementitious system through multi-scale characterization techniques. The results show that GBFS, by releasing active Si<sup>4+</sup> and Al<sup>3+</sup>, triggers a synergistic activation effect with Ca<sup>2+</sup> provided by SS, promoting the formation of C-S-H gel and ettringite, significantly optimizing the hardened paste microstructure. When the GBFS content reaches 30%, the C-S-H content increases by 40.8%, the pore size distribution improves, the proportion of large pores decreases by 68.7%, and the 90-day compressive strength increases to 5 times that of the baseline group. The sulfate activation effect of DG accelerates the hydration of silicate minerals, but excessive incorporation (&gt;16%) can lead to microcracks caused by the expansion of AFt crystals, resulting in a strength reduction. Under the synergistic effect of 8% DG and 30% GBFS, the hydration reaction is most intense, with the peak heat release rate reaching 0.92 mW/g and the cumulative heat release amount being 240 J/g. By constructing a “SS-GBFS-DG-cement” quaternary synergistic system (mass ratio range: SS:GBFS:cement:DG=(50–62):(20–40):10:(8–12)), the matching of active components in high-content SS systems was optimized, significantly improving microstructural defects and meeting engineering application requirements. This study provides a theoretical basis for the component design and performance regulation of high-content SS-based cementitious materials.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 6","pages":"Pages 1005-1018"},"PeriodicalIF":11.7,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337683","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
Time-evolution of ScCO2-weakened coal integrity: Chemo-hydromechanical coupling and geological sequestration implications scco2削弱煤完整性的时间演化:化学-流体-力学耦合和地质封存意义
IF 11.7 1区 工程技术
International Journal of Mining Science and Technology Pub Date : 2025-06-01 DOI: 10.1016/j.ijmst.2025.05.006
Peng Liu , Jingtao Yang , Baisheng Nie , Ang Liu , Wei Zhao , Hao Xu , Hengyi He
{"title":"Time-evolution of ScCO2-weakened coal integrity: Chemo-hydromechanical coupling and geological sequestration implications","authors":"Peng Liu ,&nbsp;Jingtao Yang ,&nbsp;Baisheng Nie ,&nbsp;Ang Liu ,&nbsp;Wei Zhao ,&nbsp;Hao Xu ,&nbsp;Hengyi He","doi":"10.1016/j.ijmst.2025.05.006","DOIUrl":"10.1016/j.ijmst.2025.05.006","url":null,"abstract":"<div><div>Geological sequestration of CO<sub>2</sub> is critical for deep decarbonization, but the geomechanical stability of coal reservoirs remains a major challenge. This study integrates nanoindentation, XRD/SEM-EDS chemo physical characterization and 4D CT visualization to investigate the time-evolving mechanical degradation of bituminous coals with ScCO<sub>2</sub> injection. The main results show that 4 d of ScCO<sub>2</sub> treatment caused 50.47%–80.99% increase in load–displacement deformation and 26.92%–76.17% increase in creep depth at peak load, accompanied by 55.01%–63.38% loss in elastic modulus and 52.83%–74.81% reduction in hardness. The degradation exhibited biphasic kinetics, characterized by rapid surface-driven weakening (0–2 d), followed by stabilized matrix-scale pore homogenization (2–4 d). ScCO<sub>2</sub> preferentially dissolved carbonate minerals (dolomite), driving pore network expansion and interfacial debonding, while silicate minerals resisted dissolution but promoted structural homogenization. These coupled geochemical-mechanical processes reduced the mechanical heterogeneity of the coal and altered its failure modes. The results establish a predictive framework for reservoir stability assessment and provide actionable insights for optimizing CO<sub>2</sub> enhanced coalbed methane recovery.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 6","pages":"Pages 961-973"},"PeriodicalIF":11.7,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337672","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
Deterioration mechanism and dynamic constitutive model of coal-rock assemblages considering chemical corrosion and impact damage 考虑化学腐蚀和冲击损伤的煤岩组合劣化机理及动态本构模型
IF 11.7 1区 工程技术
International Journal of Mining Science and Technology Pub Date : 2025-06-01 DOI: 10.1016/j.ijmst.2025.04.006
Jianhang Chen , Banquan Zeng , Wuyan Xu , Kun Wang , Peng Liu , Songsong Hu , Shiji Wang , Zhixiang Song , Shaokang Wu , Xuyang Bai
{"title":"Deterioration mechanism and dynamic constitutive model of coal-rock assemblages considering chemical corrosion and impact damage","authors":"Jianhang Chen ,&nbsp;Banquan Zeng ,&nbsp;Wuyan Xu ,&nbsp;Kun Wang ,&nbsp;Peng Liu ,&nbsp;Songsong Hu ,&nbsp;Shiji Wang ,&nbsp;Zhixiang Song ,&nbsp;Shaokang Wu ,&nbsp;Xuyang Bai","doi":"10.1016/j.ijmst.2025.04.006","DOIUrl":"10.1016/j.ijmst.2025.04.006","url":null,"abstract":"<div><div>To reveal the deterioration mechanism of coal-rock assemblages under chemical corrosion and dynamic loading, chemical corrosion and dynamic impact experiments were conducted. Under different chemical corrosion conditions, the weakening characteristics, observable characteristics, softening characteristics of the dynamic parameters, dynamic failure characteristics, dynamic failure forms and dynamic microscopic characteristics were analyzed. Under each corrosion condition, the dynamic elastic modulus, dynamic deformation modulus and dynamic peak intensity tended to decrease with immersing time. The dynamic elastic modulus, dynamic deformation modulus and dynamic peak intensity exhibited an inverted U-shaped trend. Under dynamic impact, the failure process of acidly corroded samples can be divided into the following stages: the initial stage, elastic energy accumulation stage, local failure of coal and secondary rock crack expansion stage, coal fragment ejection stage, rock spalling stage and complete instability stage. Under dynamic impact, failure modes exist: coal crushing failure, rock fragmenting failure, rock splitting failure and full splitting failure. After impact failure, sample fragments are distributed in powder, granular, cone and block forms. Based on Zhu-Wang-Tang nonlinear viscoelastic properties, a model considering chemical corrosion and impact damage was proposed. The combined effects of chemical and impact-induced damage on the dynamic mechanical properties of coal-rock assemblages were systematically analyzed.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 6","pages":"Pages 837-861"},"PeriodicalIF":11.7,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589089","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
Degradation mechanism of coal pillars in an underground coal gasification environment: Bearing capacity, pyrolysis behaviour and pore structure 煤地下气化环境下煤柱降解机理:承载力、热解行为和孔隙结构
IF 11.7 1区 工程技术
International Journal of Mining Science and Technology Pub Date : 2025-06-01 DOI: 10.1016/j.ijmst.2025.05.002
Jian Li , Jinwen Bai , Guorui Feng , Erol Yilmaz , Yanna Han , Zhe Wang , Shanyong Wang , Guowei Wu
{"title":"Degradation mechanism of coal pillars in an underground coal gasification environment: Bearing capacity, pyrolysis behaviour and pore structure","authors":"Jian Li ,&nbsp;Jinwen Bai ,&nbsp;Guorui Feng ,&nbsp;Erol Yilmaz ,&nbsp;Yanna Han ,&nbsp;Zhe Wang ,&nbsp;Shanyong Wang ,&nbsp;Guowei Wu","doi":"10.1016/j.ijmst.2025.05.002","DOIUrl":"10.1016/j.ijmst.2025.05.002","url":null,"abstract":"<div><div>Coal pillars are critical supporting structures between underground coal gasification gasifiers. Its bearing capacity and structural stability are severely threatened by high-temperature environments. To elucidate the high-temperature deterioration mechanism of coal pillars at multiple scales, coal strength features as a function of temperature were investigated via uniaxial compression and acoustic emission equipment. The pyrolysis reaction process and microstructure evolution were characterized via X-ray diffractometer (XRD), scanning electron microscope (SEM), thermogravimetric (TG), Fourier transform infrared spectroscopy (FTIR), and computed tomography (CT) tests. Experimental results reveal a critical temperature threshold of 500 °C for severe degradation of the coal bearing capacity. Specifically, both the strength and elastic modulus exhibit accelerated degradation above this temperature, with maximum reductions of 45.53% and 61.34%, respectively. Above 500 °C, coal essentially undergoes a pyrolysis reaction under N<sub>2</sub> and CO<sub>2</sub> atmospheres. High temperatures decrease the quantity of O<sub>2</sub>-based functional groups, growing aromaticity and the degree of graphitization. These changes induce dislocation and slip inside the coal crystal nucleus and then lead to deformation of the coal molecular structural units and strain energy generation. This process results in a great increase in porosity. Consequently, the stress deformation of coal increases, transforming the type of failure from brittle to ductile failure. These findings are expected to provide scientific support for UCG rock strata control.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 6","pages":"Pages 897-912"},"PeriodicalIF":11.7,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589091","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
Homogeneity-dependent fracture behavior and instability mechanism of composite coal-rock: Insights from three-point bending tests 煤岩复合材料均质性断裂行为及失稳机制:三点弯曲试验的启示
IF 11.7 1区 工程技术
International Journal of Mining Science and Technology Pub Date : 2025-06-01 DOI: 10.1016/j.ijmst.2025.04.007
Weitao Yue , Enyuan Wang , Xiaojun Feng , Tingjiang Tan , Li Zhang , Dong Chen , Qiming Zhang , Zeng Ding
{"title":"Homogeneity-dependent fracture behavior and instability mechanism of composite coal-rock: Insights from three-point bending tests","authors":"Weitao Yue ,&nbsp;Enyuan Wang ,&nbsp;Xiaojun Feng ,&nbsp;Tingjiang Tan ,&nbsp;Li Zhang ,&nbsp;Dong Chen ,&nbsp;Qiming Zhang ,&nbsp;Zeng Ding","doi":"10.1016/j.ijmst.2025.04.007","DOIUrl":"10.1016/j.ijmst.2025.04.007","url":null,"abstract":"<div><div>To investigate the instability mechanisms of heterogeneous geological structures in goaf area roofs, three-point bending tests (TPBT) and numerical simulations are performed on composite coal-rock (CCR). Acoustic emission (AE) monitoring is employed to analyze key parameters, establishing a multi-parameter quantitative system for CCR fracture processes. The impact of lithological homogeneity on fracture evolution and energy migration is examined. Results show that CCR exhibits a three-stage mechanical response: weak contact, strong contact, and post-peak stages, each with distinct crack evolution patterns. A positive correlation is found between lithological homogeneity and tensile crack proportion. No significant correlation is observed between AE average frequency (<em>AF</em>) and AE counts across different lithological CCR; however, peak frequency (<em>PF</em>) displays clear lithology-dependent characteristics. The regulatory effect of the rock homogeneity coefficient (<span><math><mrow><mi>φ</mi></mrow></math></span>) on crack derivation mechanisms is quantified, yielding mathematical relationships between fracture strength (<span><math><mrow><mi>f</mi></mrow></math></span>), crack propagation path angle (<span><math><mrow><mi>β</mi></mrow></math></span>), crack fractal dimension (<span><math><mrow><mi>D</mi></mrow></math></span>), and <span><math><mrow><mi>φ</mi></mrow></math></span>. The study highlights how different fracture modes alter energy migration pathways, confirming the coupling effect of grain distribution on mechanical response and crack propagation, and the influence of parameter <span><math><mrow><mi>φ</mi></mrow></math></span> on critical energy release zones. These findings offer new insights into CCR failure mechanisms for mining safety.</div></div>","PeriodicalId":48625,"journal":{"name":"International Journal of Mining Science and Technology","volume":"35 6","pages":"Pages 913-932"},"PeriodicalIF":11.7,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144304955","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
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