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Study on probability of earthquake-induced slip of geoengineering rock mass joint plane
DENG Xuejing1, QI Yucheng1, LIN Qian1, ZOU Degao2
(1.College of Pipeline and Civil Engineering in China University of Petroleum, Qingdao 266580, China;2.School of Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China)
Abstract:
Based on non-stationary random vibration model, a series of ground motions were synthesized, whose statistical parameters could satisfy the randomness of a potential earthquake. In order to evaluate the stability of engineering rock mass, horizontal equivalent acceleration (HEA) of the rock mass joint plane was defined, while the earthquake response of engineering rock mass was calculated numerically. The maximum horizontal equivalent acceleration (MHEA) was compared with the yield acceleration of the rock mass joint plane. Based on non-linear numerical calculations and ground motion samples of an earthquake, a new approach was proposed to calculate the probability density of the MHEA of rock mass joint plane. The application of this method in seismic reliability analysis of engineering rock mass was demonstrated. The numerical computation results indicate that the probability of rock mass instability under remote earthquake is below 0.01%, while the value is up to 26.1% under near earthquake, given the same magnitude of earthquake.
Key words:  rock mass  earthquake stability  dynamic reliability  horizontal equivalent acceleration