Study on Seismic Performance of Gravity Retaining Wall with Balancing Platform
|School||Southwest Jiaotong University|
|Keywords||gravity retaining wall with balancing platform plaxis Seismic performance failure mechanism earthquake peak ground acceleration foundation soilconditions|
Gravity retaining wall with balancing platform is peculiar to our country,and plays an important role in road constructions in western mountains. But western mountains are always in high-seismic intensity and Earthquake-prone areas. Earthquakes tend to cause the damage to the retaining walls, Which in turn led to dmage to road and bridge,and even slope instability,and seriously affect the process of rescue and relief work. Therefore,to study the seismic performance and its influencing factors, and to reveal failure mechanism and laws of the wall in earthquake, is of great significance in guiding the design and construction of gravity retaining wall with balancing platform.Therefore, the mainly works we have done in this paper are as follows:1, Describe the calculation method of seismic soil pressure of gravity retaining wall with balancing platform, including the second failure surface method for calculating upper’ earth pressure, and for calculating bottom’ earth pressure the wall back extending method, the wall back extending amendment method and force polygon method.2, Describe the theoretical basis of the finite element method, and make a brief introduction on Finite element software plaxis.3, Based on damage survey data of some section of gravity retaining wall with balancing platform in Wenchuan earthquake regions, to simulate the dynamic response of the two cases of the retaining wall in the earthquake by use of the finite element software plaxis. Taking the permanent displacement after the earthquake on top of the wall as inversion of control parameters, to inverse the calculation results such as seismic soil pressure by the finite element method. From the three aspects of displacement post-earthquake and failure modes, the total force of seismic soil pressure and stability factor, to analysis the seismic performance of gravity retaining wall with balancing platform. In addition, compare calculation results of specification method and finite element method (there are three approaches to deal with the rasults of the finite element method, denoted as number one,numeber two and number three), to explore the failure mechanism of the retaining wall in earthquake.4, On the basis of the typical operating conditions., made a general analysis of dynamic response for gravity retaining wall with balancing platform. Study the differences of seismic performance for the retaining wall in the aspect of different earthquake peak ground acceleration, different balancing platform width, different filling thickness before wall, and different foundation soil conditions. And from the initial three aspects to explore the mechanism of this difference lies. 5, Condensed the main conclusions, and pointed out the areas for further research.