Study On The Influence Of Construction Of Diaphragm Wall In Deep Foundation Pit On Supporting Structure And Surrounding Environment

With the development of science and technology and the improvement of economic level,architectural theory and technology are being rapidly developed,building scale is bigger and bigger.Because of the rapid development of cities,limited urban space,underground space has become an important area of urban construction.At present,The excavation space is getting bigger and deeper,surrounding buildings become more and more intensive,the city underground pipelines,which are not only stag gered but also complex and meticulous.The excavation of foundation pit,soil horizontal direction will lead to the release of stress,the foundation pit supporting structure deformation of surrounding soil,horizontal displacement and vertical settlement,and may further lead to the surrounding buildings and public facilities damage,around road damage,underground pipeline damage,and it has a wide impact and serious consequences.Therefore,the stability of the foundation pit and its impact on the surrounding security is extremely important.At present,the design theory and construction technology of foundation pit are difficult to satisfy the stability of foundation pit and surrounding environment.How to control the stability of the foundation pit and reduce the impact on the surrounding environment has been an important topic in the development of the foundation pit.In this paper,based on the deep foundation pit project of a commercial center in Wuhan and the actual situation of the project,the influence of underground continuous wall construction on the surrounding environment and the stability of self deformation of deep foundation pit are studied.Research contents include:(1)To prepare for numerical simulation,the deformation theory of foundation pit is analyzed,the surrounding environment of the foundation pit is analyzed,and the construction technology is discussed.(2)This paper expounds the situation of the foundation pit engineering and the actual monitoring work and content of the project.Based on the actual monitoring data of the project site,the deformation of the foundation pit and the surrounding environment of the foundation pit excavation are obtained.It also puts forward some suggestions on the design of foundation pit stability and the measures to reduce the influence of surrounding rock.(3)The finite element software ANSYS is used for the numerical analysis of the actual engineering,and the deformation stability of the foundation pit and the surrounding environment are analyzed.It is found that the deformation and deformation of the foundation pit during the excavation of the foundation pit and the settlement and deformation of the surrounding environment.This paper analyzes the mechanism of reducing the foundation pit and the surrounding deformation.Through the analysis of deformation mechanism,a new construction scheme is proposed to reduce the deformation.And the new construction plan and the general construction scheme are analyzed and compared.Some practical conclusions are obtained for engineering design and construction.(4)Based on the existing theoretical research,combined with the actual situation of engineering,by considering the two deformation modes,namely triangular deformation and parabolic deformation,using the incremental principle,combined formation loss method,wall soil deformation and surrounding settlement formula are deduced.Compared with the actual engineering data,the consistency is good,which is more reasonable than the traditional calculation method.