摘要
Abstract
A coupled 3-D finite difference numerical model considering the confined water,soil,supporting structure,horizontal and vertical support system was established based on strain correlated Cam-Clay elastoplastic model.The interaction between the continuous wall and the soil was considered,and the FLAC3D software was adopted to simulate the stepped excavation of the foundation pit.The deformation behavior of the deep foundation pit affected by the confined water was analyzed comprehensively,including the basal heave of excavation,the lateral displacement of the envelope,the subsidence and lateral displacement both behind the wall and in the deep soil,and the effect of the pressure head on the deformation of the foundation pit was finally analyzed.The results show that when the initial head is relatively large,the initial pressure head has a big different on the deformation at the bottom of the foundation;The deformation at the specific point of the pit bottom increases with the increase of the initial pressure head,which shows a good agreement with the laboratory test results;Under different initial water pressure head,the lateral displacement of the continuous wall is relatively large below the horizontal support;The lateral displacements of the wall located in the aquifer and the confined aquifer show different changing forms with the increasing initial pressure head;The deformation difference of the soil behind the wall is smaller under different initial pressure head;in the ideal aquifuging condition,the pressure head has a small effect on the deformation of the foundation pit during excavation.关键词
相互作用/承压水/坑底隆起/基坑变形/有限差分/数值模拟Key words
interaction/confined water/excavation basal heave/excavation pit deformation/finite difference/numerical simulation
