Nonlinear Dynamic Responses Analysis On The High Rock Slope Subjected To Earthquake Action

With the rapid development of domestic capital intensity and the smooth implementation of development strategy in these years, the stability problem of rock slope is increasing accordingly. Especially, landslide disaster caused by strong earthquakes is very heavy. Therefore research on the dynamic responses and stability of rock slope under earthquake load is very important in theories as well as in practices. In this paper, some primary studies, aimed at the dynamic responses and stability of rock slope under earthquake load are carried on.The main studies have been done as follows:1,The development, the application, and the character of analysis methods of rock slope seismic stability have been summed up systematically. And some concise remarks have been made. Meanwhile, a few problems of seismic responses in rock slope, which need to be done in future, have been suggested.2,The Discontinuous Deformation Analysis with Lagrange Multiply (LDDA) have been introduced. The recursive formula for displacement, velocity, and acceleration have been established with LDDA method. The theory of Rayleigh damping and the experience formula on calculation time step have been given. Also, an iterative algorithm for dynamic contact force and the computer program of LDDA have been introduced. In the end, two examples are given to show the high calculated efficiency of the LDDA program.3,Time domain method, as a simple method of high precision is presented, which is used to generate artificial earthquake wave, aimed at the data of acceleration and seismic records are lack in engineering earthquake-proof. In connection with an engineering practice, artificial earthquake has been generated from the time-domain method, which fitted with the response spectrum decided by "The Seismic Design Code of Hydraulic Structure", realized artificial synthesis of the earthquake. The results of which have been used in the seismic analysis of practical engineering.4,A free field input method for rock slope seismic responses have been introduced based on the viscous dashpots and elastic springs. The method of artificial generated seismic motions with time domain method and the method of time domain finite element with spring-viscous boundary have been used. This model can imitate the transmission of earthquake wave from base rock, and consider the effect of infinite foundation damp. Therefore, the result is more reality, and the input model is feasible to the input of earthquake in rock slope.5,The LDDA method have been adopted to analysis the earthquake responses of high rock slope. Taken the slope of a large-scale hydro project as an example, the earthquake responses of the slope under the earthquake have been solved, the opening and closing phenomenon of the discontinuous planes in this slope under earthquake have been simulated, the amplification effect on the slope have been analyzed in detail, the dynamic influence law under the earthquake in slope have been summarized. The results show that: LDDA method can be used in dynamical analysis of rock slope with discontinuous planes.