Wang Chaosheng, Zhou Hongwei, Pei Hao, Wang Zihui, Liu Jianfeng. Study on energy concentration and dissipation of Beishan granite in Gansu during failure process[J]. Journal of Mining Science and Technology, 2018, 3(6): 536-542.
Citation:
Wang Chaosheng, Zhou Hongwei, Pei Hao, Wang Zihui, Liu Jianfeng. Study on energy concentration and dissipation of Beishan granite in Gansu during failure process[J]. Journal of Mining Science and Technology, 2018, 3(6): 536-542.
Wang Chaosheng, Zhou Hongwei, Pei Hao, Wang Zihui, Liu Jianfeng. Study on energy concentration and dissipation of Beishan granite in Gansu during failure process[J]. Journal of Mining Science and Technology, 2018, 3(6): 536-542.
Citation:
Wang Chaosheng, Zhou Hongwei, Pei Hao, Wang Zihui, Liu Jianfeng. Study on energy concentration and dissipation of Beishan granite in Gansu during failure process[J]. Journal of Mining Science and Technology, 2018, 3(6): 536-542.
1School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing 100083,China;2School of Water Resources and Hydropower,Sichuan University,Chengdu Sichuan 610065,China
Servo test system was used to obtain stressstrain curves of Beishan granite under different confining pressure,and the loading process was jointly controlled by means of axial pressure and circumferential deformationVariation characteristics of energy and characteristic stress of Beishan granite were researchedCharacteristic stress are linear increase with confining pressure increasing,crack initiation stress,damage stress and peak strength increased 330 MPa,674 MPa,768 MPa respectively along with confining pressure increased 1 MPaTotal energy and elastic energy corresponding to characteristic stress are greatly increase with confining pressure increasingWhen confining pressure increased form 2 MPa to 30 MPa,elastic energy corresponding to initiation stress,damage stress and peak stress increased 52 times,58 times and 51 times respectively,corresponding total energy increased 49 times,57 times and 47 times respectivelyThe increment of dissipation energy increase with increasing of confining pressure,and energy at the crack unstable propagation stage was significant affected by confining pressureEnergy storage coefficient was defined to estimate rock stability around the peak strength,effect of stress state coefficient on energy storage was further analyzed