Research On The Deformation Of Foundation Pit And Soil Pressure Considering The Effect Of Time And Space

The foundation pit is a both old and new topic,in the current technical specifications,supporting structure calculations are used in plane strain,but the foundation is a three-dimensional structure,and it has strong temporal and spatial effects.If the supporting design is regarded as a plane problem to calculate,the calculation results will have a big difference between the stress state of reality..Therefore,this paper base on the drainage box of Chongqing Jiangbei Gai Lan Xi sports park on the west side of the culvert foundation and carry out the following research work:(1)Through analyzing the field monitoring data of deep foundation pit of row pile horizontal displacement and shaft support force with the excavation conditions to promote changes rule.(2)using the finite element software MADIS-GTS to establish the foundation pit engineering three-dimensional numerical analysis model,and compare the calculation results and monitoring data,and analyze the similarities and differences between the two points.(3)Through studying different pile spacing between foundation pit deformation,it can get critical pile spacing characteristic value when destroying the foundation pit;Through studying different pile retaining soil thickness of foundation pit deformation changes,it can get retaining soil plate thickness influence on the deformation of foundation pit and pile;Through studying foundation pit under the support of the different height position of deformation,it can get maximum support position influence on foundation pit deformation and provide reference for the design and construction of the project.(4)To change the different construction sequence of excavation and support,analyze the deformation of the foundation pit under different construction sequence,and get the excavation method of the optimal foundation pit deformation control.