Seismic Time-History Responese Znzlysis Of Rock Slope Contains Soft Soil Layer

Seismic stability of slope is one of hot problems in geologic seismic engineering and earthquake engineering field. Studies show that there are egregious coherence between the distribution of global earthquake belts and landslide belts,which sufficiently reflects the effects of earthquake inducing on slope stability losing. That complexity of the composition of geological materials constitutive modes and speciality of earthquake ground motion with strong randomicity make slope seismic stability difficult. Some primary studies, aimed at seismic stability of rock slope under earthquake ground motion are carried on.The several analyses have done:1,The advancement of several important problems on seismic stability analysis of rock-soil slopes is reviewed,including analysis method of seismic response,dynamic properties,strength criteria, rock slope failure location,seismic stability evaluation methods, earthquake input and computations accuracy of seismic stability evaluation index,and concise remarks are made. Then some study problems,which need to be done in future,are suggested.2,The seismic stability of slopes under the action of factors summarized in the geological setting, structure of rock slope and the type of lithology combination, the slope of hydrogeological conditions.On the slope of the dynamic failure in earthquake was discussed that the earthquake will have two effects on the slope:the role of the earthquake and seismic inertial forces generated and pore water pressure increases rapidly and the cumulative effect. These two effects together result the instability of slope.3,The analysis method truly reflecting the characters of earthquake ground motion is the basis of concisely describing seismic response of rock-mass. Applying dynamic characteristics of rock mass plastic explicit finite element method fluctuations, describes the real rock ground motions in explicit wave propagation of elastic-plastic finite element calculation principle and implementation details, including the rock plastic constitutive relation, boundary conditions, model damping, seismic loads applied, the material parameters of the select, elastic-plastic nonlinear approach. For obvious soft soil layer in rock slope with the different method is given.4,Based on the principle of dynamical response time-dependent analysis, the dynamic response and stability of the weathering rock slope which contains soft soil layer were analyzed with ADINA program in the following way. Firstly, the static finite element analysis was made to determine the initial stress field. Then, the slope dynamic response was analyzed and the stress, displacement, and acceleration were studied. Dynamic response results of slope in the seismic action are achieved by means of time-dependent analysis,which can be applied to reflect the dynamic characteristics of slope.