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| Study on triaxial compression damage evolution characteristics of coal based on energy dissipation |
| ZHANG Yao1，LI Bobo1，2，3，XU Jiang4，GAO Zheng1，CHEN Shuai1，WANG Bin1 |
| (1. College of Mining，Guizhou University，Guiyang，Guizhou 550025，China；2. National and Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas，Guizhou University，Guiyang，Guizhou 550025，China；3. Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources，Guiyang，Guizhou 550025，China；4. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400044，China) |
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Abstract In the underground mining engineering activities of coal resources，coal is in the complex stress environment with the coupling of the axial pressure，the confining pressure and the gas pressure. In order to explore the damage deformation and energy evolution characteristics of coal during the compression process，the triaxial compression test of coal under different confining pressures and different gas pressures is carried out by using a triaxial servo-controlled seepage device. Based on the theory of continuous damage mechanics，the damage stress-strain function composed of heterogeneous Weibull function，energy dissipation function and plastic strain function is deduced theoretically from the angle of energy，and the plastic damage constitutive model of coal based on energy dissipation is constructed. The results show that the change trend of stress-strain and plastic deformation behavior of coal under different confining pressures and different gas pressures have stage characteristics. Corresponding to different deformation and failure stages，the energy evolution trend of coal and rock shows periodic changes. It is also shown that，at the stress peak point，the total energy absorbed by coal as well as the elastic energy and the dissipated energy increases with increasing the confining pressure. However，the total energy absorbed by coal and the elastic energy decrease with increasing the gas pressure，while the dissipated energy increases. A plastic damage constitutive model of coal based on energy dissipation under the effect of the confining pressure and the gas pressure is constructed，and the rationality of the model is verified by experiments. Under different confining pressures and gas pressures，the energy dissipation and damage evolution of coal experience a S type evolution trend.
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2021, Vol. 40 
