Research on deformation prediction at any position of deep foundation pit for subway station in Beijing
The deformation of foundation pit caused by deep excavation is a complicated three-dimensional space problem,significant cost and time can be taken on carrying out three dimensional analysis,which,additionally,is not normally carried out at an early stage of the design of a project.In order to predict the deformation conveniently,this paper presents an simplified methodology that allows calculation of the formation deformations at any position considering the spatial effect.Base on the two-dimensional plane strain calculation method,the three-dimensional calculation method of the center section of the long side of the foundation pit is derived by introducing the plane strain coefficient.Furthermore,the vertical transfer coefficient,horizontal transfer coefficient and complementary error function are used to predict the deformation at any position in the formation;then cases are analyzed.This method can be easy to use by hand avoiding low efficiency,long period and high cost in three-dimensional numerical simulation.The whole state and magnitude of the foundation deformation could be directly reflect from the calculation results.It can be used in conjunction with two-dimensional numerical analysis and also for calculating displacements in early stages of projects when numerical analysis has not yet been undertaken,so as to provide reference for design and construction.
deep foundation pitthree-dimensional deformationsimplified mothedsubway station
NETL
NSTL
万方数据
