首页|Microstructural and thermal properties of coal measure sandstone subjected to high temperatures

Microstructural and thermal properties of coal measure sandstone subjected to high temperatures

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To study the microscopic structure,thermal and mechanical properties of sandstones under the influence of temperature,coal measure sandstones from Southwest China are adopted as the research object to carry out high-temperature tests at 25 ℃-1000 ℃.The microscopic images of sandstone after thermal treatment are obtained by means of polarizing microscopy and scanning electron microscopy(SEM).Based on thermogravimetric(TG)analysis and differential scanning calorimetric(DSC)analysis,the model function of coal measure sandstone is explored through thermal analysis kinetics(TAK)theory,and the kinetic parameters of thermal decomposition and the thermal decomposition reaction rate of rock are studied.Through the uniaxial compression experiments,the stress-strain curves and strength characteristics of sandstone under the influence of temperature are obtained.The results show that the temperature has a significant effect on the microstructure,mineral composition and mechanical prop-erties of sandstone.In particular,when the temperature exceeds 400 ℃,the thermal fracture phe-nomenon of rock is obvious,the activity of activated molecules is significantly enhanced,and the kinetic phenomenon of the thermal decomposition reaction of rock appears rapidly.The mechanical properties of rock are weakened under the influence of rock thermal fracture and mineral thermal decomposition.These research results can provide a reference for the analysis of surrounding rock stability and the control of disasters caused by thermal damage in areas such as underground coal gasification(UCG)channels and rock masses subjected to mine fires.

Rock mechanicsCoal measure sandstoneMicromorphologyThermal damage

Weijing Xiao、Dongming Zhang、Shujian Li、Mingyang Wu

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School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang,330013,China

State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing,400044,China

Yunnan Phosphate Chemical Group Co.,Ltd.,Kunming,650600,China

National Engineering and Technology Research Center for Development and Utilization of Phosphate Resources,Kunming,650600,China

State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,430071,China

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Scientific Research Foundation of State Key Laboratory of Coal Mine Disaster Dynamics and ControlJiangxi Provincial Natural Science Foundation of China

2011DA105287-zd20180420232BAB214036

2024

10.1016/j.jrmge.2023.11.007

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(8)
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