The Numerical Analysis On The Influence Of The Pile Under The Foundation Pit Excavated

In recent years,China's urbanization construction rapid acceleration.Exceedingly deep or huge foundation pits appears more and more frequently.All kinds of foundation pits which will be built are closer and closer with the constructed building structures,such as the elevated bridge abutments and other all kinds of pipeline facilities been built.The external environment of excavation construction on foundation pit is also becoming increasingly complex.Therefore,how to complete the excavation task safely and efficiently,how to avoid the corresponding engineering accidents of foundation pit and how to master the influence of the adjacent building facilities caused by the excavation of foundation pits have been one of the most paramount topics in the geotechnical engineering field.On the reference of the foreign and domestic scholar's production,this paper will utilize the large general finite element software ABAQUS to simulates the whole process of the deep foundation pit excavated on one examples of underground continuous wall supporting.The disadvantaged effects on pile foundation brought by excavation unloading of soil had been analyzed.The main research contents are as follows:1.Firstly,this article has outlined the research background and status at home and abroad on this topic and development trend on contemporary foundation Pit Engineering.Addition,the typical strength theory of soil mass,the determination methods and selections principle of soil resistance shear index,the existing theories of foundation pit deformation and interaction mechanisms of piles and soil have been discussed too.2.The application and theory of the software ABAQUS in geotechnical engineering are briefly introduced,including the soil constitutive models widely used,contact theory of soil and building,the setting of initial stress field and the simulation of excavation procedure.3.With the help of software called ABAQUS,this paper simulated the influence orderliness of the adjacent pile foundation brought by foundation pit excavation under the support of the underground continuous wall.I mainly research the influence regular of the retaining structure and adjacent single pile on the horizontal displacement,vertical displacement and axial force caused by excavation.The factors of the deformation of pile foundation,such as wall stiffness,pile stiffness,pile load and other factors is also deeply explored by the method of control variable.