Dynamic Analysis Of Retaining Wall

With the propulsion of China's western development, more and more highway began to extend to the west. Most of the western region is a typical mountainous topography. In such places to building highways, it will inevitably encounter a lot of half-dug half-filled and steep embankments, retaining structures must be used to guarantee the stability of the embankment in order to ensure that the road transport security. The balance weight retaining wall's chest-slope is very steep and its back wall is tipsy, so it is widely used because it can reduce the height of retaining wall designed and the amount of earth excavation. Most parts are located in a high-intensity earthquake zone in Sichuan Province, seismic design of retaining walls is particularly important.Currently the studies of self-vibration frequency of roadbed and retaining structures are few, using static method to calculate seismic effect. Gravity retaining wall based on our standards for a typical wall type in our country, and only considers the role of horizontal seismic force to conduct seismic design seismic forces. But also Japan, the United States and New Zealand norms have not been considered the role of vertical seismic forces, but European standards are taken into account. In this paper, by earthquake damage surveys, large-scale shaking table test, combining with ANSYS finite element numerical simulation to explore the role of the retaining wall under seismic dynamic response. In this paper, I carried out research in the following areas:1.Through the retaining wall shaking table test, I has reached the distribution of the horizontal acceleration and the seismic active earth pressure along the wall high, combining with general-purpose finite element analysis software ANSYS to simulate the experiment, the experimental results and numerical simulation result. They come to a conclusion that correct numerical simulation model providing an experimental basis.2. Using ANSYS modal to analyze two types of shoulder wall, I extract ahead five frequencies and mode shape. According to 4m,6m,8m,10m and 12m, contrasting the conflation of the balance weight retaining wall and steep retaining wall,1 have obtained that the vibration frequency decrease with the increase of the high walls; at the same height, weight balance type of vibration frequency larger than the steep type.3. Using ANSYS transient analysis about the 8m-high balance weight retaining wall on soil based, using Wenchuan seismic wave, in accordance with 0.1g,0.2g,0.4g,0.6g,0.8g and 0.9g 6 kinds of input-wave peak, analyze the subject only to the horizontal of seismic forces, subject only to vertical seismic force and horizontal earthquake force and joint action of vertical earthquake force, conclude the maximum horizontal displacement of top of the wall with the earthquake magnitude, the horizontal of seismic derived the retaining wall displacements play a leading role, vertical seismic forces has little effect and can be negligible.