Numerical Simulation Of Soil Nailing Support In Deep Excavation Based On Deformation Control

The foundation pit engineering is a large excavation unloading projects，Foundation pit excavation led to horizontal displacement,surface settlement andbasement uplift, more and more project accidents appear.With complicatedenvironment conditions during urban underground space developing process; Moresevere restrictions are required for these deep excavations.how to control thedeformation of deep foundation and protect the safety of buildings became more andmore important. The current design bases mainly stability contract of foundation Pit,and there is no mature theoretical for calculation of displacement and deformation ofsupport structure. the calculation model on the Premise of many assumptions cannotsufficiently reflect characteristics of support structure and the interaction between thesupporting structure and the soil. So to calculate the displacement and deformation ofthe supporting system accurately is still a problem at present. This thesis is based onpractical project, adopting theoretical analysis and numerical simulation methods,simulating the construction process of excavating and supporting for deep excavation,then laws of displacement of soil is discussed. the influence factors of deformation ofthe soil nailing is analyzed. Contents are mainly showed as follows:The thesis analyzed the current research present situation of foundation pit,theproblems in the current research and the trend of the development about the excavationengineering. In this article deformation rule of the foundation pit is described, as well asthe corresponding the influence analysis of the deformation. the mechanism ofdeformation and their calculation methods are introduced.Discussed the mechanism and deformation characteristics of the soil nailing,Introduced the limit equilibrium analysis method and the finite element method. Byusing these methods to calculate the internal force and the deformation of the soilnailing support.The basic feature and the computable principles of the ANSYS software isintroduced. based on the full analysis of working mechanism of the soil nailingsupporting structure. the numerical model of a project was built by using of ANSYSsoftware, The procedure of the staged excavation and retaining on soil nailing issimulated. According to simulated data, the laws of displacement of soil is discussed.Various parameters of the soil nailing the influence to the deformation of the soilnailing was studied, in addition, the laws of displacement the disposal, inclination angle,the length, the ground overload and spacing of the soil nailing were discussed.