The evolution of sandstone energy dissipation under cyclic loading and unloading
DENG Huafeng1，2，HU Yu1，2，LI Jianlin1，2，WANG Zhe1，2，ZHANG Xiaojing1，2，HU Anlong1，2
(1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area，Ministry of Education，China Three Gorges University，Yichang，Hubei 443002，China；2. Collaborative Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area，Hubei Province，Yichang，Hubei 443002，China)
Abstract：To analyze the evolution law of rock energy dissipation，a series of uniaxial cyclic loading and unloading tests for sandstone have been designed and conducted. The typical cyclic loading and unloading hysteresis loop characteristic curve has been analyzed in detail，the variation and relationship of the total power，the elastic deformation energy，dissipated energy，energy dissipation rate，residual strain，damage variable and some other parameters during loading and unloading process have been discussed. The results showed that：(1) during cyclic loading and unloading process，the stress-strain hysteresis is obvious，and there is significant residual strain，whose effects should be considered in the calculation of the energy parameters. (2) Considering the impact of residual deformation and hysteresis effects，modified calculation methods of energy parameters during cyclic loading and unloading process have been proposed. (3) When rock samples is close to failure during the cyclic loading and unloading process，there is a significant increase for the energy parameters and residual strain，and the energy parameters and residual strain can effectively predict the destruction of rock samples. (4) The correlation of energy dissipation rate and residual strain shows from another perspective that the residual strain cannot be ignored in the calculation of energy parameters. The research results have a good reference value for the analysis of rock damage evolution law during cyclic loading and unloading process.
邓华锋1，2，胡 玉1，2，李建林1，2，王 哲1，2，张小景1，2，胡安龙1，2. 循环加卸载过程中砂岩能量耗散演化规律[J]. 岩石力学与工程学报, 2016, 35(S1): 2869-2875.
DENG Huafeng1，2，HU Yu1，2，LI Jianlin1，2，WANG Zhe1，2，ZHANG Xiaojing1，2，HU Anlong1，2. The evolution of sandstone energy dissipation under cyclic loading and unloading. , 2016, 35(S1): 2869-2875.
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2016, Vol. 35 
