Microstructural and thermal properties of coal measure sandstone subjected to high temperatures
作者机构：School of Civil Engineering and ArchitectureEast China Jiaotong UniversityNanchang330013China State Key Laboratory of Coal Mine Disaster Dynamics and ControlChongqing UniversityChongqing400044China Yunnan Phosphate Chemical Group Co.Ltd.Kunming650600China National Engineering and Technology Research Center for Development and Utilization of Phosphate ResourcesKunming650600China State Key Laboratory of Geomechanics and Geotechnical EngineeringInstitute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China
出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)
年 卷 期：2024年第16卷第8期
页 面：2909-2921页
核心收录：
学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）]
基 金：supported by the Scientific Research Foundation of State Key Laboratory of Coal Mine Disaster Dynamics and Control(Grant No.2011DA105287-zd201804) Jiangxi Provincial Natural Science Foundation of China(Grant No.20232BAB214036)
主 题：Rock mechanics Coal measure sandstone Micromorphology Thermal damage
摘 要：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 *** the uniaxial compression experiments,the stress‒strain curves and strength characteristics of sandstone under the influence of temperature are *** results show that the temperature has a significant effect on the microstructure,mineral composition and mechanical properties of *** particular,when the temperature exceeds 400℃,the thermal fracture phenomenon of rock is obvious,the activity of activated molecules is significantly enhanced,and the kinetic phenomenon of the thermal decomposition reaction of rock appears *** mechanical properties of rock are weakened under the influence of rock thermal fracture and mineral thermal *** 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.
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