Study On The Retaining Structure Of Deep Foundation Pit And Safety Control Of Subgrade Close To Railway

In the constructions of neighboring railway deep foundation pit, train dynamicload is a factor cannot be neglected to the stability of foundation. However, theexisting specifications and theories have not made detailed elaboration and analysisof the dynamic load influence to the neighboring railway foundation pit in theprocess of construction. Therefore, the research of deformation law of neighboringrailway deep foundation pit and the influence to railway embankment byconstruction of deep foundation pit has a very important practical significance, andit can provide experience and reference to the design and construction of similarprojects.This thesis takes a station deep foundation pit project of light rail the thirdstage in Changchun as the background, through the methods of theoretical analysis,on-site monitoring and numerical simulation, research profoundly the stability andthe influence to the surrounding environment of enclosure structure of neighboringrailway deep foundation pit in the process of construction. The main contents are asfollows:1.Analyze the stability of supporting structure of the deep foundation pit andthe surrounding environment from the risk source.2.Use Finite Difference Method to conduct the static simulation of excavationof deep foundation pit process, convert railway dynamic load to the correspondingstatic load, carry out numerical simulation, and analyze the result of the simulation.3.Enter railway dynamic load into FLAC3D，conduct the three-dimensionalnumerical simulation of dynamic response to the foundation pit constructionaffected by dynamic load, and analyze the result of the simulation.4.Through the analysis of the monitoring data of foundations collected at thescene, and compare with the results of the numerical simulation, research andanalyze the security of railway embankment in the process of the foundationconstruction, so that to summarize the laws of railway embankment deformationand stability in the process of foundation construction.5.Based on the above analysis, evaluate the foundation supporting system ofthe light rail station, in order to provide guidance to the following similar projects.