The Deformation Laws Research Of Supporting Structure Of Deep Foundation Pit During Excavations

With the rapid development of city construction, people on the utilization of urban underground space becomes more and more high, deep excavation caused environmental geotechnical engineering problem is getting attention by people , so that the theory of deep excavation research, design and construction are stillnot perfect topic and become the research hotspots industry. From engineering perspective, the design of deep excavation has developed from the intensity of control by the initial to deformation control, system control.So deformation research of bracing structure of deep excavation has important significance to design optimization. Based on the subway XunLiMen station of wuhan city of deep excavation engineering, horizontal displacement of palisade structure deformation is analyzed. the main work is as follows:(1)This paper briefly introduces the characteristics of excavation engineering, the current situation of foundation pit engineering development and mainly analyze mechanical characteristics and deformation laws of underground continuous wall.(2) Summarizes the constitutive relation theory of soil, mainly introduces failure criteria, yield criterion, the current standards, hardening criterion and detailed discusses Drucker - Prager constitutive model used in this paper.(3) Using the ANSYS finite element analysis software, raise period in metro station excavation course of typical sections is analysised. The analysis solusion indicate that finite element analysis land even wall deformation curve and measured curve shape is roughly identical. Thus under the parameter selection appropriate circumstances ANSYS numerical simulation of the plane can be used for supporting structure displacement prediction..(4) According to the calculation of finite element software, the main factors to influenc wall deformation such as wall stiffness interior support stiffness, interior support prestressed, soil parameters is analysised, Drawing some regular conclusions, accumulating the experience for similar projects.