The Dynamic Response Study Of The Empty-box-buttress Retaining Wall

The retaining wall is an indispensable part of the water conservancy project.Its main role is to support the soil after the wall and maintain the soil balance.The seismic performance of the retaining wall has a direct impact on the safety of the whole water conservancy project under strong earthquake.The empty-box-buttress retaining wall is a kind of common structural type in retaining wall.It is usually used in low-carrying ground and high retaining soil conditions.At present,there are few studies on the dynamic response of such retaining wall under earthquake action.So this paper enriches the theoretical basis of the study of the stability of retaining wall under earthquake action,which can provide some reference for structural seismic design.In this paper,the empty box-buttress retaining wall was taken as the object of study,considering the interaction between the wall and soil as well as infinite foundation.In this paper,the study mainly includes the following parts:The research methods of earthquake damage and earthquake response of retaining walls at home and abroad have been summarized.The basic theory of dynamic finite element method and the constitutive model of wall-soil structure have been discussed.The finite element-infinite element coupling model of two-dimensional gravity retaining wall was established by combining physical experiments.The results of simulation of structural acceleration were compared with that of gravity-based retaining wall model test.The veracity and superiority of the infinite element boundary conditions in the structure simulation of the dynamic response were verified.According to the specific hydraulic engineering example,the finite element-infinite element coupling model of three-dimensional retaining wall was established.The dynamic response of the structure under the action of EI-Centro wave with peak acceleration of 0.2g was analyzed by using Rayleigh damping and time history analysis.By using control variable method,the effects of seismic wave intensity and different ground motions on the horizontal acceleration,horizontal displacement,maximum principal stress,minimum principal stress and dynamic earth pressure of the retaining wall were studied.The results show that the dynamic response amplitude of the retaining wall increases with the increase of the seismic wave intensity,and the period and regularity of the dynamic response time history are related to the ground motion characteristics.As well as the spatial distribution of the dynamic response is independent of the ground motion characteristics.The date of the EI-Centro wave was entered to the model from the base by adjusting the peak values to 0.1g,0.2g,0.4g,0.6g and 0.8g respectively.The dynamic responses of the retaining wall under the three conditions were compared.The influence of vertical seismic force on the dynamic response of the retaining wall was analyzed.It is concluded that the horizontal seismic force plays a dominant role in the dynamic response of the retaining wall and the vertical seismic force has little influence on the retaining wall.