A Study Of Internal Force And Deformation Of Retaining Structures For Foundation Pits Based On Additional Earth Pressures

The analysis of internal force and deformation is the key point in the design of retaining structures for foundation pits.Considering the relationship between earth pressure and deformation is very important to analyze the internal force and deformation of retaining structures.The space effect of foundation pits can be fully reflected in the design of retaining structures for foundation pits based on the theory of additional earth pressure.In this paper,based on the laboratory test,numerical simulation and three-dimensional finite element analysis of bar structures,the theory of internal force and additional earth pressure of foundation pits near bank slope is studied.The main work and achievements are as follows:1.The deformation,earth pressure and design method of retaining structures for foundation pits are summarized,and the development trend of additional earth pressure with horizontal displacement under different working conditions is analyzed.2.Indoor model tests of foundation pit excavation under the condition of shore site are carried out.The earth pressure,horizontal displacement and internal force distribution of the support structure under the condition of overload after excavation and excavation are studied.The relationship between the actual earth pressure,the additional earth pressure and the horizontal displacement is analyzed,and the expression of the additional earth pressure behind the wall is put forward.3.Plaxis3 d software is used and the earth pressure,horizontal displacement,internal force distribution and interrelation of the retaining structure under the condition of excavation and overload after excavation are analyzed.The relationship between the real earth pressure,the additional earth pressure and the horizontal displacement is compared under different soil parameters and retaining wall parameters.4.The finite element program of three-dimensional bar structure embedded with additional earth pressure expression is used to calculate the example of retaining structures.And the relationship between the additional earth pressure and displacement of the retaining structure is considered.The spatial effect of the foundation pit is reflected by the calculation results,which proves the feasibility for the analysis of the internal force and deformation of retaining structures based on the theory of additional earth pressure.