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Experimental study on the deformation behaviour,energy evolution law and failure mechanism of tectonic coal subjected to cyclic loads

查看全文 作　　者：Deyi [1,2]Gao;Shuxun [1,2,3,4]Sang;Shiqi [1,2,3,4]Liu;Jian [5]Wu;Jishi [1,2]Geng;Wang [1,2]Tao;Tengmin [1,2]Sun 高影响力作者 机构地区：[1]Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process,China University of Mining and Technology,Xuzhou 221116,China;[2]School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China;[3]Carbon Neutrality Institute,China University of Mining and Technology,Xuzhou 221116,China;[4]Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization,China University of Mining and Technology,Xuzhou 221116,China;[5]China United Coalbed Methane Co.Ltd.(CUCBM),Beijing 100083,China高影响力机构 出　　处：《International Journal of Mining Science and Technology》索引2022年第32卷第6期,共13页高影响力期刊 基　　金：funded by the National Major Scientific Research Instrument Development Project(No.41727801);the National Natural Science Foundation of China(Nos.42030810 and 41972168);the Dominant discipline support project of Jiangsu Province(No.2020CXNL11);the Foundation of Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization(No.2019A001). 摘　　要：Compared to intact coal,tectonic coal exhibits unique characteristics.The deformation behaviours under cyclic loading with different confining pressures and loading rates are monitored by MTS815 test system,and the mechanical and energy properties are analysed using experimental data.The results show that the stress-strain curve could be divided into four stages in a single cycle.The elastic strain and elastic energy density increase linearly with deviatoric stress and are proportional to the confining pressure and loading rate;irreversible strain and dissipated energy density increase exponentially with deviatoric stress,inversely proportional to the confining pressure and loading rate.The internal structure of tectonic coal is divided into three types,all of which are damaged under different deviatoric stress levels,thereby explaining the segmentation phenomenon of stress-strain curve of tectonic coal in the cyclic loading process.Tectonic coal exhibits nonlinear energy storage characteristics,which verifies why the tectonic coal is prone to coal and gas outburst from the principle of energy dissipation.In addition,the damage mechanism of tectonic coal is described from the point of energy distribution by introducing the concepts of crushing energy and friction energy. 关 键 词：Tectonic coal Cyclic loading Deformation behaviour Energy evolution Failure mechanism
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