A Subway Building Excavation Analysis Of The Seepage Deformation

With the rapid development of modern city, high-rise buildings are built higher, thefoundation pit excavation depth is more and more deep, and more and more environmentalfactors were considered, in which the seepage of groundwater is one of the most importantfactors. In the process of excavation, due to foundation pit of groundwater to be reduced, somade the groundwater flow tend to accelerate leading to initial seepage field, stress field anddisplacement field changed. Influence of groundwater seepage of foundation pit engineeringhas become an emphasis and difficult questions in construction, so it is necessary to furtherstudy influence of groundwater seepage on foundation pit engineering.On the basis of the foundation ditch of one subway building, and based on thepercolation theory, this paper using two-dimensional finite element method for foundation pitsin saturated-unsaturated seepage and studied under fluid-solid coupling deformation ofFoundation pit. Firstly, based on percolation theory for unsaturated flow equation, complexequations of saturated-unsaturated seepage, and analyze the seepage in the partial satuaredsoil and the seepage field of the foundation pit under different work conditions withGEO-SLOPE. Secondly, taking the displacements and the pore water pressure as variables toestablish the finite element equations under the double influence of the fluid and solid, andmade the simulation analysis of excavation deformation of deep foundation pit. Thirdly, theinfluence on foundation pit by the factor of different underground water levels, embeddeddepth and pile section is studied obtained the deformation discipline of embedded depth andthe surface subsidence, and put forward the suitable built-in depth control deformation offoundation pit displacement of retaining structures. Finally, analyze the surface settlement,pile displacement and vertical displacement deformation of basement with two kinds ofcalculation methods whether the coupling effect is considered. It can be refered to foundationpit seepage problem for the future.