Analysis On Medical Response And Influencing Factor Of The Enclosure Wall In The Reverse Construction Method Of Dual-purpose Diaphragm Wall And The Deep Foundation Pit

In recent years,with the city process improvement,development and utilization of the underground space in the city and emerge in an endless stream of high-rise building,super deep and large foundation pit excavation depth,whether in the area or technical difficulty have been repeatedly refresh.The inverse approach plays an increasingly important role undoubtedly in this process,the two walls in one top-down deep excavation system because of its many advantages in terms of deformation,shorten the construction period,the sustainable development in the control and is widely used,more and more liked by the engineers.With the deep foundation pit of a building on the two walls in one deep foundation of reverse deformation,through the finite element software ANSYS,using Drucker-Prager model,stress import function using ANSYS(INISTATE command)to achieve the initial stress before excavation of the self balance of two dimensional numerical analysis of soil retaining structure and surrounding environment,integration of ground and underground,the whole process simulation of foundation pit excavation.The main work is as follows:(1)with a lateral deformation of the retaining structure and ground surface settlement behind the wall,and the heave of foundation pit considering the deformation of the upper structure construction of the systematic analysis of the two wall,and compared with the measured results,verify the two-dimensional finite element numerical analysis of the rationality and applicability of the.(2)the process of excavation were analyzed by engineering common plane method of vertical beam on elastic foundation by using ANSYS software,and compared with the analysis results of two dimensional finite element method,the correctness of the calculation results shows that the vertical plane elastic foundation beam method.(3)using ANSYS powerful post processing APDL language,change of finite element numerical analysis model,using single factor analysis method,focusing on the influence of continuous wall thickness,basement slab thickness,continuous wall insertion ratio,the excavation surface below the value of M,continuous wall elastic modulus of two walls in one branch of retaining wall side shift.The results show that the influence factors of one branch of lateral displacement of retaining wall in the two wall,improve the surface soil layer below the excavation deformation m values can be well controlled continuous wall,to meet the strength of the premise,the insertion ratio and basement slab thickness increased almost has no effect on the deformation.The continuous wall elastic modulus and wall thickness of these two factors while the deformation can control the continuous wall to a certain extent,but brings the increase of bending moment,so generally has little effect.These practical conclusions can provide guidance for the design of similar retaining structures.