ENERGY ANALYSIS OF SEISMIC STABILITY OF ROCK SLOPE
LU Yanxin，LI Haibo，LIU Yaqun，CHEN Qiuyu
(State Key Laboratory of Geotechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：For the geological disasters of slope failure under seismic loads，the failure criterion has been a hot and difficulty issue in rock mechanics. The main objective in the study is to combine the limit analysis and wave theory to carry out a new evaluation of slope stability from the perspective of power，that is，the rate of external work is equal to the rate of energy dissipation. By means of the methods of strength reduction and overload factor，the factors of safety were adopted to evaluate the quantitative safety of the rock slope. The oblique incident P wave across a single joint in jointed slope was considered. The variations of the critical height of jointed slopes and the transmission and reflection of stress waves were investigated. Then，within the critical height of jointed slopes，the variation of the critical height was studied under the stress wave. Finally，based on the energy criterion that the rate of external work is equal to the rate of energy dissipation，the variations of FOS were investigated by means of the methods of strength reduction and overload factor. The sliding energy of the block in limit state was also calculated. The investigations revealed that the higher the cohesion of the joint，the higher the self-stable height of the jointed slope. Therefore，the higher critical heights of the jointed slope during earthquakes result in the significant improvement of the seismic performance of the jointed slope. As the peak strength of the incident P-wave increases，the reduction degree of the critical height of jointed slope also increases. As the incidence of the stress wave decreases，the variation degree of the critical height of the jointed slope also gradually increases，indicating that the failure possibility of the slope is also increasing during earthquakes. The variation of FOS is just opposed to that of the transmitted waves. The higher the rock slope is，the more unstable the block is. Therefore，the corresponding sliding energy is decreasing as the jointed slope is in limit state.
吕言新，李海波，刘亚群，陈秋宇. 岩质边坡抗震稳定性的能量方法研究[J]. 岩石力学与工程学报, 2015, 34(05): 876-883.
LU Yanxin，LI Haibo，LIU Yaqun，CHEN Qiuyu. ENERGY ANALYSIS OF SEISMIC STABILITY OF ROCK SLOPE. , 2015, 34(05): 876-883.
2015, Vol. 34 
