The Dynamic Response Of Toppling Slope Under Earthquake

China is a highly earthquake country.Shawozi slope at State Road 317 (213) line in Dujiangyan to Wenchuan highway section, the right bank of Minjiang River, about 3km away from Wenchuan county town. The local of Shawozi slope were damaged in the WenChuan earthquake, it is going to affect Road 317 (213) line safety, Therefore, study shawozi toppling slope in the dynamic response under earthquake has important practical significance.This article summarizes the research deformablelandslide history and current situation, and to shawo child slope, for example, focuses on the geological aspects of engineering analysis deformablelandslide in the dynamic response under earthquake. Conducting field investigations after the earthquake, based on the slope of the overturned deformation in the formation and evolution under strong earthquake mechanism is analyzed and, in this based on shaking table tests of physical modeling simulation analysis, a good re- is the dumping of deformed under the force in the earthquake response characteristics, and then established a two-dimensional discrete element model of deformation and failure deformablelandslide process of inversion depth analysis focused on the overturned deformation in strong earthquakes deformation rate, displacement and vector distribution and characteristics, and then create a finite element model of the stress field and plastic zone analysis, from the stress of the To verify the reasonableness of the work ahead.(1) on the basis of previous studies on the overturned deformation in the dynamic response under earthquake is summarized, and the slope in the earthquake in the dynamic response characteristics are summarized.(2) were similar to the principle of physical simulation and summarized, and the Chengdu University of Technology developed its own system of vibration test bed for analyzing the principles described and pointed out the characteristics of the vibration table, the slope for the sub Shawodi deformablelandslide simulation test program accordingly, and use of laboratory tests for many years experience to the physical parameters required for this test.(3) using DEM software UDEC on the slope of the dumping of sub-Shawodi deformed under the action carried out in the earthquake simulated by iteration to calculate a total of 90,000 steps, the following conclusions: the dumping of slope deformation in strong damage under earthquake had said can be divided into three stages: the first stage, resulting in tensile cracks. The initial model, the deformation mainly concentrated in the front of the toe of slope Department, followed by posterior slope, showed the foot of rock crack, a small tensile cracks appeared after the edge. The second stage, the development of cracks. La posterior deepening widening cracks, front rock deformation increased, the interface slope front base cover of the deformation of cover appears, showing tension cracks appeared slope table. The third stage, unstable failure. Pull back edge crack increase and a rock outside the projectile to the slope, slope instability to the slope outside the office rock movement, the overall buckling down front cover, slope failure.(4) through the finite element numerical model to calculate the dumping Shawodi deformed child in the earthquake induced slope stability analysis, the following conclusions can be drawn:1) earthquake state, the slope of the maximum displacement and natural state is different from most natural state, mainly in posterior displacement, maximum displacement under seismic focus on slope surface cover, the displacement gradually reduced from outside to inside small cover near the interface in the base to form a sliding surface, front surface covering layer of the largest displacement of about 36cm or so.2) earthquake state, the slope of the maximum principal stress is mainly distributed in the slope surface of the dump body and the cover, after the front edge has increased relative to the maximum principal stress decreases from outer to inner, near the bedrock place close to zero, and the natural state consistent.3) Seismic state, the minimum principal stress distribution and the natural state, similar to the adjacent slope where the surface of the minimum principal stress tends to zero; close to the internal slope, minimum principal stress direction also produced significant deflection, gradually to the slope, almost vertical, the stress value decreased gradually from the inside out, place the gradual slope near zero, and the natural state did not show different is the local tensile stress phenomenon.4) Seismic state, distribution of plastic zone and the different natural state, natural state, the model of the plastic zone mainly localized in the cover layer, the plastic zone under seismic conditions mainly in the slope surface of the cover , localized plastic zone occurs in the frontal zone through the ductile failure to form a band, obviously this will cause great the threat to the stability of the slope.5) earthquake state, the slope will be covered by layer through the formation of a continuous increment of shear strain increased with the increase of shear strain increment through the entire base covered with the interface, thus can be considered at this time the slope has been cover within the interface formed along the base of a continuous follow-through of the potential sliding zone (area).