不同温度下露天煤矿泥岩多尺度特征研究

doi:10.3724/1000-6915.jrme.2025.0899

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Abstract To systematically investigate the evolution patterns and intrinsic relationships between the micro-mesoscopic structure and macroscopic mechanical properties of open-pit mine mudstone under varying temperatures, samples from an open-pit mine in Inner Mongolia were subjected to heat treatment at temperatures ranging from 25 °C to 600 °C. Multiscale characterization techniques, including X-ray diffraction (XRD), computed tomography (CT) scanning, and scanning electron microscopy (SEM), were employed to analyze the evolution of mineral composition, crystallinity, pore structure, and microcrack distribution. In conjunction with uniaxial and triaxial compression tests, the influence of temperature on mechanical parameters such as strength, elastic modulus, and Poisson’s ratio was examined, elucidating the restraining effect of confining pressure on high-temperature damage. The main findings are as follows: (1) While mineral composition remained relatively stable, crystallinity demonstrated a nonlinear trend, initially increasing and then decreasing, with a peak of 77.9% observed at 400 °C. (2) Porosity increased from 6.8% to 17.9% with rising temperature, as the pore structure evolved from smaller to larger pore sizes; additionally, microcracks initiated, propagated, and interconnected, ultimately forming a highly connected three-dimensional fracture network at 600 °C. (3) High-temperature exposure shifted the failure mode from ductile to brittle. The peak strength under uniaxial compression and crystallinity exhibited a consistent trend with temperature variation, indicating that microstructural evolution is a key factor governing macroscopic mechanical behavior. (4) Under varying confining pressures, both peak strength and elastic modulus of mudstone increased with rising temperature, while the effectiveness of confining pressure in mitigating thermal damage improved with increased confining pressure. This finding suggests that confining pressure can inhibit the propagation of microcracks and partially offset the thermal damage caused by high temperatures. The research results provide a crucial basis for developing slope control measures in open-pit coal mines under conditions of spontaneous coal combustion.

Key words： rock mechanics mudstone high temperature crystallinity pore structure mechanical properties

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	Articles by authors
	LI Guanghe1
	2*
	LIU Saifei1
	WANG Dong1
	JIA Hongjun1
	WANG Laigui3
	KONG Lingwei4

Cite this article:

LI Guanghe1,2*,LIU Saifei1, et al. Multiscale characterization of mudstone in open-pit coal mines under thermal effects[J]. , 2026, 45(8): 2283-2298.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0899 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/I8/2283

[1] 袁亮，张通，王玥晗，等.深部煤炭资源安全高效开采科学问题及关键技术[J].煤炭学报，2025，50(1)：1–12.(YUAN Liang，ZHANG Tong，WANG Yuehan，et al. Scientific problems and key technologies for safe and efficient mining of deep coal resources[J]. Journal of China Coal Society，2025，50(1)：1–12.(in Chinese))
[2] 唐跃刚，王绍清，王晓帅，等.洁净煤地质内涵、现状与未来发展方向[J]. 煤田地质与勘探，2025，53(1)：36–63.(TANG Yuegang，WANG Shaoqing，WANG Xiaoshuai，et al. Connotation，research status，and development directions of clean coal geology in China[J]. Coal Geology and Exploration，2025，53(1)：36–63.(in Chinese))
[3] LORE S J，EICHHUBL P，AYDIN A .Alteration and fracturing of siliceous mudstone during in situ combustion，Orcutt field，California[J]. Journal of Petroleum Science and Engineering，2002，36(3/4)：169–182.
[4] 邓军，王津睿，任帅京，等. 采空区煤自燃高温点识别与探测技术研究与展望[J]. 煤炭学报，2024，49(2)：885–901.(DENG Jun，WANG Jinrui，REN Shuaijing，et al. Identification and detection technology for high-temperature spontaneous combustion points in goaf areas[J]. Journal of China Coal Society，2024，49(2)：885–901.(in Chinese))
[5] 邓军，杨成，任立峰，等. 基于机器学习的煤自燃预测研究进展及展望[J]. 煤炭学报，2025，50(增1)：336–360.(DENG Jun，YANG Cheng，REN Lifeng，et al. A review on coal spontaneous combustion prediction based on machine learning[J]. Journal of China Coal Society，2025，50(Supp.1)：336–360.(in Chinese))
[6] 崔铁军，马云东，王来贵. 露天矿边坡残煤自燃温度场及燃深研究[J]. 安全与环境学报，2016，16(6)：50–54.(CUI Tiejun，MA Yundong，WANG Laigui. Study of the temperature field and combustion depth of the residual coal spontaneous combustion in the open-pit mine slope[J]. Journal of Safety and Environment，2016，16(6)：50–54.(in Chinese))
[7] 田华，李新鹏，韩流，等. 黑山露天矿浅部火烧区边坡稳定性研究[J]. 煤矿安全，2018，49(3)：222–224.(TIAN Hua，LI Xinpeng，HAN Liu，et al. Study on slope stability of shallow buried area in Heishan surface mine[J]. Safety in Coal Mines，2018，49(3)：222–224.(in Chinese))
[8] 王明，吴璋，徐长友，等. 富水弱胶结露天边坡劣化失稳机理研究[J]. 煤田地质与勘探，2025，53(8)：154–169.(WANG Ming，WU Zhang，XU Changyou，et al. Deterioration and instability mechanisms of water-rich and weakly cemented open-pit slopes[J]. Coal Geology and Exploration，2025，53(8)：154–169.(in Chinese))
[9] 张功基，李长冬，孟杰，等. 浸水作用下泥岩膨胀特性及其关键界面响应机制[J]. 中国地质灾害与防治学报，2025，36(4)：15–25.(ZHANG Gongji，LI Changdong，MENG Jie，et al. Mudstone swelling characteristics and key interface response under water immersion[J]. The Chinese Journal of Geological Hazard and Control，2025，36(4)：15–25.(in Chinese))
[10] 龚涛，何荣昊，何川，等. 降雨诱发滑坡全过程流固耦合模拟与滑坡时机研究[J]. 岩石力学与工程学报，2025，44(10)：2 608–2 621.(GONG Tao，HE Ronghao，HE Chuan，et al. Fluid-solid coupled modeling of the entire process of rainfall-induced landslides and study of landslide timing[J]. Chinese Journal of Rock Mechanics and Engineering，2025，44(10)：2 608–2 621.(in Chinese))
[11] 曾铃，郭雨，高乾丰，等. 湿热交替下粉砂质泥岩裂隙动态扩展及机制研究[J]. 岩土工程学报，2025，47(4)：820–828.(ZENG Ling，GUO Yu，GAO Qianfeng，et al. Dynamic fracture propagation and mechanism of silty mudstone under hydrothermal alternation[J]. Chinese Journal of Geotechnical Engineering，2025，47(4)：820–828. (in Chinese))
[12] 张淑坤，王来贵，陆璐，等.赋存结构面粉砂质泥岩力学性能弱化机制研究[J]. 岩土工程学报，2020，42(11)：2 015–2 023.(ZHANG Shukun，WANG Laigui，LU Lu，et al. Weakening effects of occurrence structural plane on mechanical properties of silty mudstone[J]. Chinese Journal of Geotechnical Engineering，2020，42(11)：2 015–2 023.(in Chinese))
[13] 张亚妹，孙淦，白晓宇，等. 受动力打桩影响的泥岩宏细观力学特性室内试验研究[J]. 中南大学学报：自然科学版，2023，54(11)：4 523–4 530.(ZHANG Yamei，SUN Gan，BAI Xiaoyu，et al. Laboratory test on macroscopic and mesoscopic mechanical properties of mudstone affected by driven pile[J]. Journal of Central South University：Science and Technology，2023，54(11)：4 523–4 530.(in Chinese))
[14] 刘瑞雪，茅献彪，张连英，等. 温度对泥岩力学性能的影响[J]. 矿业研究与开发，2012，32(4)：97–99.(LIU Ruixue，MAO Xianbiao，ZHANG Lianying，et al. Influence of Temperature on Mechanical Properties of Mudstone[J]. Mining Research and Development，2012，32(4)：97–99.(in Chinese))
[15] 张连英，张树娟，茅献彪，等. 考虑温度效应的泥岩损伤特性试验研究[J]. 采矿与安全工程学报，2012，29(6)：852–858.(ZHANG Lianying，ZHANG Shujuan，MAO Xianbiao，et al. Experimental research on thermal damage properties of mudstone at a high temperature[J]. Journal of Mining and Safety Engineering，2012，29(6)：852–858.(in Chinese))
[16] 查文华，宋新龙，武腾飞，等. 温度对煤系泥岩力学特征影响的试验研究[J]. 岩土力学，2014，35(5)：1 334–1 339.(CHA Wenhua，SONG Xinlong，WU Tengfei，et al. Experimental study of mechanical characteristics of coal-serial mudstone under different temperatures[J]. Rock and Soil Mechanics，2014，35(5)：1 334–1 339.(in Chinese))
[17] 张连英，吴鹏，李明，等. 实时温度下煤系泥岩动态力学特性及微观破裂特征研究[J]. 煤炭学报，2025，50(增1)：192–204. (ZHANG Lianying，WU Peng，LI Ming，et al. Study on dynamic mechanical properties and microscopic fracture characteristics of coal measures mudstone at real-time temperature[J]. Journal of China Coal Society，2025，50(Supp.1)：192–204.(in Chinese))
[18] ZHANG L Y，MAO X B，LIU R X，et al. Meso-structure and fracture mechanism of mudstone at high temperature[J]. International Journal of Mining Science and Technology，2014，24(4)：433–439.
[19] ZHANG Y，WAN Z J，MCLENNAN J，et al. Influence of temperature on physical and mechanical properties of a sedimentary rock：Coal measure mudstone[J]. Thermal Science，2021，25(Part A)：159–169.
[20] 茅献彪，张连英，刘瑞雪. 高温状态下泥岩单轴蠕变特性及损伤本构关系研究[J]. 岩土工程学报，2013，35(增2)：30–37.(MAO Xianbiao，ZHANG Lianying，LIU Ruixue. Creep properties and damage constitutive relation of mudstone under uniaxial compression at high temperature[J]. Chinese Journal of Geotechnical Engineering，2013，35(Supp.2)：30–37.(in Chinese))
[21] ZHU Z N，TIAN H，CHEN J，et al. Experimental investigation of thermal cycling effect on physical and mechanical properties of heated granite after water cooling[J]. Bulletin of Engineering Geology and the Environment，2020，79(5)：2 457–2 465.
[22] 刘磊，李睿，秦浩，等. 高温后深部矽卡岩动力学特性及微观破坏机制研究[J]. 岩土工程学报，2022，44(6)：1 166–1 174.(LIU Lei，LI Rui，QIN Hao，et al. Dynamic mechanical properties and microscopic damage characteristics of deep skarn after high-temperature treatment[J]. Chinese Journal of Geotechnical Engineering，2022，44(6)：1 166–1 174.(in Chinese))
[23] WANG S，WANG L G，REN B，et al. Mechanical behavior and fracture characteristics of high-temperature sandstone under true triaxial loading conditions[J]. Journal of Materials Research and Technology，2024，28：569–581.
[24] 林志南，肖虎生，张强，等. 高温作用下砂岩物理力学特征及损伤多尺度研究[J]. 工程科学与技术，2026，待刊.(LIN Zhinan，XIAO Husheng，ZHANG Qiang，et al. Study on physical and mechanical characteristics and multi-scale damage of sandstone under high temperature[J]. Advanced Engineering Sciences，2026，to be presses. (in Chinese))
[25] 宿腾跃，李皋，上官自然，等. 川南须二段致密砂岩高温后损伤演化机制与力学行为研究[J]. 岩石力学与工程学报，2025，44(11)：3 071–3 085.(SU Tengyue，LI Gao，SHANGGUAN Ziran，et al. Damage evolution mechanism and mechanical behavior of tight sandstone in the second member of Xujiahe Formation in Southern Sichuan after high temperature[J]. Chinese Journal of Rock Mechanics and Engineering，2025，44(11)：3 071–3 085.(in Chinese))
[26] SIRDESAI N N，SINGH N T，GAMAGE P R .Thermal alterations in the poro-mechanical characteristic of an Indian sandstone-A comparative study[J]. Engineering Geology，2017，226：208–220.
[27] 侯迪，彭俊. 热损伤大理岩三轴力学特性及强度模型[J]. 岩石力学与工程学报，2019，38(增1)：2 603–2 613.(HOU Di，PENG Jun. Triaxial mechanical behavior and strength model for thermally-damaged marble[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(Supp.1)：2 603–2 613.(in Chinese))
[28] 朱振南，梁缘，解经宇，等. 高温后花岗岩三轴压缩条件下力学特性试验研究[J]. 岩土工程学报，2026，48(1)：33–44.(ZHU Zhennan，LIANG Yuan，XIE Jingyu，et al. Experimental investigation on mechanical behavior of granite specimens after thermal treatment under conventional triaxial compression[J]. Chinese Journal of Geotechnical Engineering，2026，48(1)：33–44.(in Chinese))
[29] 王刚，郑金叶，刘义鑫，等. 不同温度作用下砂岩微观结构变化与演化规律实验研究[J]. 岩石力学与工程学报，2024，43(3)：600–610.(WANG Gang，ZHENG Jinye，LIU Yixin，et al. Experimental study on the microstructure change and evolution law of sandstone under different temperatures[J]. Chinese Journal of Rock Mechanics and Engineering，2024，43(3)：600–610.(in Chinese))
[30] 秦雷，王平，李树刚，等. 液态CO2-高温蒸汽循环冲击煤体三维CT裂隙重构及劣化机理[J]. 煤炭学报，2024，49(增1)：304–313.(QIN Lei，WANG Ping，LI Shugang，et al. Reconstruction and degradation mechanism of three-dimensional CT cracks in coal under the cycle impact of liquid CO2 high-temperature steam[J]. Journal of China Coal Society，2024，49(Supp.1)：304–313.(in Chinese))
[31] 吴云，王嘉敏，黄震，等. 高温条件下北山花岗岩细观结构演化试验研究[J]. 岩土工程学报，2025，48(1)：196–205.(WU Yun，WANG Jiamin，HUANG Zhen，et al. Experimental study on microstructure evolution of Beishan granite under high temperature conditions[J]. Chinese Journal of Geotechnical Engineering，2025，48(1)：196–205.(in Chinese))
[32] 李烨，杨圣奇，刘子璐，等. 不同加载速率和温度下红砂岩的动态力学特性及本构模型(英文)[J]. Journal of Central South University，2025，32(5)：1 922–1 937.(LI Ye，YANG Shengqi，LIU Zilu，et al. Dynamic mechanical properties and constitutive model of red sandstone under different loading rates and high temperatures[J]. Journal of Central South University，2025，32(5)：1 922–1 937.(in Chinese))
[33] 陈宇龙，张玉. 不同温度热处理石灰岩的物理力学性质试验研究[J]. 岩石力学与工程学报，2017，36(增2)：3 732–3 739.(CHEN Yulong，ZHANG Yu. Experimental study of physical and mechanical behavior of limestone subjected to different heat treatment temperatures[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(Supp.2)：3 732–3 739.(in Chinese))
[34] 黄彦华，张坤博，杨圣奇，等. 高温后花岗岩微观特征及其对强度影响规律研究[J]. 岩石力学与工程学报，2025，44(2)：359–372. (HUANG Yanhua，ZHANG Kunbo，YANG Shengqi，et al. Study on the microstructure characteristic and its influence on strength properties of granite specimens after high temperature treatment[J]. Chinese Journal of Rock Mechanics and Engineering，2025，44(2)：359–372. (in Chinese))
[35] 刘力源，罗胜文，王涛，等. 超高温下花岗岩微观结构与能量演化特征的多尺度研究[J]. 岩石力学与工程学报，2025，44(9)： 2 305–2 320.(LIU Liyuan，LUO Shengwen，WANG Tao，et al. Multiscale study of microstructural and energy evolution characteristics of granite under ultra-high temperature conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2025，44(9)：2 305–2 320.(in Chinese))
[36] 吴鹏，张连英，郑亚东，等. 考虑温度与升温速率效应的砂岩细观损伤机制研究[J]. 采矿与安全工程学报，2025，42(3)：696–707.(WU Peng，ZHANG Lianying，ZHENG Yadong，et al. Study on the mesoscopic damage mechanism of sandstone considering the effect of temperature and heating rate[J]. Journal of Mining and Safety Engineering，2025，42(3)：696–707.(in Chinese))
[37] 张嘉凡，代超凡，张慧梅，等. 动力扰动作用下冻融砂岩细观损伤演化分析[J]. 岩土工程学报，2026，48(5)：919–928.(ZHANG Jiafan，DAI Chaofan，ZHANG Huimei，et al. Analysis of mesoscopic damage evolution in freeze-thawed sandstone under dynamic disturbance[J]. Chinese Journal of Geotechnical Engineering，2026，48(5)：919–928.(in Chinese))
[38] 李杨杨，庞海超，张士川，等. 基于CT三维重构煤岩疲劳损伤演化及数值模拟研究[J]. 煤炭科学技术，2026，54(2)：237–246.(LI Yangyang，PANG Haichao，ZHANG Shichuan，et al. Fatigue damage evolution characteristics and time effect analysis of coal-rock based on CT three-dimensional reconstruction[J]. Coal Science and Technology，2026，54(2)：237–246.(in Chinese))
[39] 张天军，伍珊，庞明坤，等. 裂隙分形维数对孔周煤体瓦斯非Darcy渗流特征参数的影响[J]. 煤炭学报，2025，50(增1)：361–371.(ZHANG Tianjun，WU Shan，PANG Mingkun，et al. Influence of fractal dimensions of fissures on characteristic parameters of non-Darcy seepage of coal gas in peripore coal bodies[J]. Journal of China Coal Society，2025，50(Supp.1)：361–371. (in Chinese))
[40] 廖进，兰春晖，吴勇桃，等. 红层软岩软化的微–细–宏观界面关联过程与跨尺度级联效应[J]. 岩石力学与工程学报，2024，43(5)：1 241–1 254.(LIAO Jin，LAN Chunhui，WU Yongtao，et al. Micro-meso-macro interface correlation processes and cross-scale cascade effects in red-bed soft rocks softening[J]. Chinese Journal of Rock Mechanics and Engineering，2024，43(5)：1 241–1 254. (in Chinese))
[41] QI L D，PENG W，ZHENG C .Influence of temperature and confining pressure on the mechanical properties of granite[J]. Powder Technology，2021，394：10–19.
[42] LIU L，JIN J，LIU J，et al. Mechanical properties of sandstone under in-situ high-temperature and confinement conditions[J]. International Journal of Minerals，Metallurgy and Materials，2025，32(4)：1–10.
[43] 徐小丽，高峰，张志镇. 高温后围压对花岗岩变形和强度特性的影响[J]. 岩土工程学报，2014，36(12)：2 246–2 252.(XU Xiaoli，GAO Feng，ZHANG Zhizhen. Influence of confining pressure on deformation and strength properties of granite after high temperatures[J]. Chinese Journal of Geotechnical Engineering，2014，36(12)：2 246–2 252.(in Chinese))
[44] 谢世杰，林杭，陈怡帆，等. 一种岩石在三轴压缩条件下的非线性经验强度准则(英文）[J]. Journal of Central South University，2021，28(5)：1 448–1 458.(XIE Shijie，LIN Hang，CHEN Yifan，et al. A new nonlinear empirical strength criterion for rocks under conventional triaxial compression[J]. Journal of Central South University，2021，28(5)：1 448–1 458.(in Chinese))