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

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

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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 pro-cess.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 mech-anism of tectonic coal is described from the point of energy distribution by introducing the concepts of crushing energy and friction energy.

Tectonic coalCyclic loadingDeformation behaviourEnergy evolutionFailure mechanism

Deyi Gao、Shuxun Sang、Shiqi Liu、Jian Wu、Jishi Geng、Wang Tao、Tengmin Sun

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Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process,China University of Mining and Technology,Xuzhou 221116,China

School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116,China

Carbon Neutrality Institute,China University of Mining and Technology,Xuzhou 221116,China

Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization,China University of Mining and Technology,Xuzhou 221116,China

China United Coalbed Methane Co.Ltd.(CUCBM),Beijing 100083,China

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National Major Scientific Research Instrument Development Project国家自然科学基金国家自然科学基金Dominant discipline support project of Jiangsu ProvinceFoundation of Jiangsu Key Laboratory of Coalbased Greenhouse Gas Control and Utilization

4172780142030810419721682020CXNL112019A001

2022

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCDSCIEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2022.32(6)
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