Optimization Design And Simulation Analysis Of Deep Foundation Pit Support In A Building

The deep foundation pit support project is one of the hot sub-projects in the construction of houses and municipal public works in China,and it is also one of the important factors that restrict the overall project benefit and the construction period of the joint.Due to the large number of urban buildings and old urban areas that need to be rebuilt,his space is limited in the excavation of the foundation pit project;Therefore,under the protection of its own safety,the safe and smooth development of the projects under the ground also needs to ensure other safety,such as: surrounding buildings,pipelines,roads and so on.Therefore,the requirements for the foundation pit project are higher.It is of great practical significance to study deep foundation pit engineering in the course of stress strain deformation and its stability.The background of this article is the foundation pit support project in a building in Shenzhen.In the joint application of lizheng deep foundation pit software and FLAC3 D software,the practicability of numerical simulation method is verified in the deep foundation pit project.At the same time,the horizontal displacement and the soil stress inside and outside the foundation pit are the key research objects in the excavation of foundation pit.Their changing characteristics have always been the lifeblood that affects the overall stability of the foundation pit support system.In this regard,we mainly studied the following points:1.Li Zheng software was used to theoretically calculate various conditions of a preliminary plan and optimization scheme for the foundation pit support of a building in Shenzhen.At the same time,the stress and displacement indexes of the two schemes were compared and analyzed through the calculation results.2.The FLAC3 D finite difference software was used to simulate the excavation process of the foundation pit,and the horizontal displacement,ground settlement and stress change of each section of the pit were simulated.According to the results of numerical simulation,the characteristics of displacement and stress change under various excavation conditions are analyzed.3.According to the results of real-time monitoring data obtained during the excavation process,the theoretical calculation results of Li Zheng Software and the numerical simulation results of FLAC3 D finite difference software are compared.From the comparison and analysis of the three data,it can be seen that there are certain differences among the three data.The main reason for the difference is the large dispersion of geotechnical parameters,and it is difficult to realize the comprehensive consideration of the space-time effect and many influencing factors in numerical simulation.However,the development trends and quantitative results are in good agreement with the actual monitoring data,which verifies the rationality and feasibility of the numerical simulation of the deep foundation pit project and provides reference for similar deep pit projects in the region or similar areas.