Numeircal Simulation Of Diaphragm Wall Ritaining Structure In Deep Foundation Pit Based On Deformation Control

Deep foundation excavation engineering is a comprehensive and complicated subject. The the improvement and optimizing of its theory and engineering directly propel the development of urban construction. Due to the limitation of the surrounding environment, the deformation of architectures and pipe network facilities caused by the excavation must be controlled. Current excavation design has gradually shifted from strength control to deformation control. How to effectively control deformation of foundation pit and to make foundation pit engineering safe and stable become more and more important.In this text, the development and application status of deep foundation pit engineering was introduced and the design theory of deep foundation pit was summarized. The finite element method, used in the numerical simulation, was emphatically introduced, and the three dimensional numerical model was constructed in term of deep foundation pit engineering examples. The whole process of excavation and supporting technology was step by step simulated by the finite element software MIDAS/GTS. The displacement cloudscape of foundation pit was obtained by calculating, and the deformation control problem of the wall hold palisade structure was researched. Furthermore, the change laws of foundation pit deformation and pit soil mass displacement in the deep foundation pit excavation process were analysed, from which it is obtained that the limit of the maximum horizontal displacement of diaphragm wall and soil hole. It is pointed out that the deep foundation pit deformation has the steric effect and the key position of deformation was found out.This research aimed to the deformation factors which have effect on supports retaining wall structural distortion. The computation models of different continuous wall stiffness, brace stiffness and entering ground depth in underground continuous wall were established. The graph of deep foundation pit deformation in different parameters of wall hold palisade structure was obtained, and thus the impact of deformation of foundation pit in various parametric variables was analysed for the sake of safety and economy of wall hold palisade structure design and providing information for the similar supporting structure design of deep foundation pit engineering in future.