3D Numerical Simulation Analysis Of Foundation Pit Support Of Based On MIDAS-GTS

With the economic and social improvement, the extraordinary development of urbanconstruction, the relative scarcity of buildable lots， development and utilization ofunderground space is very important. The basement and underground garage numbermultiplication，excavating depth of foundation pit from several meters to dozens of meters.And zhe adjacent buildings and underground subway and other underground projects exist,That makes bracing projects for excavation become more difficult, the bracing projects designand construction for deep foundation pit as one of the very important research topic in thefield of geotechnical engineering.This article takes Dalian deep foundation pit project as the research object, for somedifficult problems of the bracing projects design and construction of E region of DalianRailway East Station Renovation Projects. the intensive study by introducing the strengthreduction fem of the bracing projects design and construction for deep foundationpit is carried out. The main contents are followed:（1）A comprehensive summary of design and construction of deep foundation pitsystem of Dalian on the status quo. Pointed out that the current problems and the lack of deepfoundation pit support design,on this basis, according to the latest research results ofgeotechnical engineering, the development and engineering experience of Dalian`s foundationpit supporting, taking the deep foundation pit of Dalian Railway East Station as the object of study,undertook thorough analysis to its rationalityof bracing projects design, feasibility of constructionand safety of supporting structure for deep foundation pit.（2）Through LiZheng—a software for designing the deep foundation pit supportingstructure—to figure out the supports design of E region`s deep foundation pit and get thesupporting scheme. In the stage of the foundation pit construction and building foundationconstruction, according to the requirements of related codes, analysis and comparison of theactual monitoring data, to further verify the rationality and feasibility of the scheme.（3）On the basis of LiZheng and MIDAS-GTS,by introducing The finite elementmethod，based on the actual situation of deep foundation pit engineering came up with aThree-dimensional fem model of deep foundation pit to analyse the lateral displacement of deep foundation pit, the stress-strain and internal force of supporting structure and thesettlement of surrounding buildings more directly.（4）In this paper, through different research methods to analyze the soil pressure after theexcavation of foundation pit in E region. Designing of foundation pit supporting scheme, atthe same time analysis and comparison of the actual monitoring data and showing that thesupport model has higher reliability and practicability. Provide technical support for the futureof foundation pit support design and construction technology.