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| Energy and damage analysis of sandstone under true triaxial compression |
| LIU Zhixi1，2，MENG Xiangrui1，2，ZHAO Guangming1，2，ZHANG Ruofei1，2，LIU Chongyan1，2，
KAO Siming3，QI Minjie1，2 |
| (1. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines，Anhui University of Science and Technology，Huainan，Anhui 232001，China；2. Key Laboratory of Safe and Effective Coal Mining，Ministry of Education，Anhui University of Science and Technology，Huainan，Anhui 232001，China；3. School of Mechanics and Optoelectronics Physics，Anhui University of Science and Technology，Huainan，Anhui 232001，China)
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Abstract In order to explore the true triaxial compression under the energy and the damage evolution law of sandstone，with independent research and development of disturbance unloading rock true triaxial test system for a real triaxial unloading test and true triaxial compression test，the evolvement of true triaxial compression stress-strain are studied，and the influence of the principal stress on rock mass is discussed. The elastic energy density of true triaxial compression，dissipation energy density and input energy density are calculated by graphics area，and their variations with the unloading level of the maximum principal stress are analyzed. The damage evolution law of the rock mass during the true triaxial compression process，and the elastic energy index for determining the tendency of impact ground pressure is discussed. The results show that the increase of the maximum principal stress under true triaxial compression makes the internal stress of sandstone adjust，resulting in the change of strain in the direction of medium and small principal stress. This phenomenon is defined as“induced increase”of energy from the perspective of energy. The types of principal stress loading and unloading in three directions were divided into damage loading(maximum principal stress loading) and protection loading(medium and small principal stress loading). Unloading is divided into conventional unloading(maximum principal stress unloading) and damage unloading(medium and small principal stress unloading). Under true triaxial compression，the confining stress in the middle principal stress direction is larger，making the proportion of induced elastic energy density in this direction higher than that in the direction of minimum principal stress. The stress of maximum principal stress direction increases under true triaxial compression，and there is a linear function relationship between the elastic energy density，dissipated energy density and input energy density of sandstone. The energy analysis method of true triaxial compression is proposed，and the energy storage limit of sandstone is further obtained. Compared with uniaxial compression，its energy storage capacity is greatly improved. The damage variable of sandstone under true triaxial compression changes approximately linearly before the plastic stage，and presents a nonlinear evolution trend with the increase of maximum principal stress.
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2023, Vol. 42 
