Combination Of Soil And Rock Strata Supporting The Subway Deep Excavation Monitoring And Numerical Simulation

With the rapid economic development, accelerating the pace of the city, to meetthe growing public travel, rail transfer, the need for parking and other functions, thegrowing tension in the center of urban land use, development and utilization ofunderground space, as has been the development of the Underground Railroad forcountries to solve the traffic problem is one important direction. Construction of thesubway is the most important building of the subway station, subway station excavationbecause most of the city’s downtown section, near the building foundation intensive,deep underground excavation pit size and depth of the plane will bring a series ofincreases complex issues, such as: foundation pit of the deformation and stability of thestructure, the construction of the adjacent environment, underground pipeline, theimpact of ground transportation, will be subject to subway construction and design unitsof attention, if not handled properly, project will lead to security problems.Qingdao Subway just started, with Qingdao in rock unique geological conditionsare distinct from Shanghai, Shenzhen and other soft soil, sand is also different from theBeijing area. In this paper, Qingdao City, Metro Line3Taipingjiao station deepexcavation for the study, for the enclosure wall deformation, the surrounding soilsubsidence, axial force and other aspects of the monitoring data for analysis. Combinedanalysis of the conclusions of the enclosure wall supporting structure for the numericalsimulation analysis, using theoretical analysis, field monitoring and numericalsimulation analysis of a combination of methods, analysis of the Pacific deep pit in thecorner station, under the combined supporting deformation. The main contents of thisarticle are as follows:(1) an overview of the current development status of foreign deep pit deformationand deformation of deep excavation-site monitoring of the status quo.(2) describes the common base pit supporting structure, the deformationmechanism of the deep pit, deep pit enclosure system failure characteristics, deep pitdeformation factors and control measures. (3) details of the project monitoring programs, on-site monitoring by the collationof data analysis, the displacement of the wall construction process control, surfacesubsidence and the axial force changes in such laws, by monitoring the data comparedwith control values, time to do out of adjustment, will help guide the construction goessmoothly.(4) using the finite element analysis software FLAC3D, enclosure wall of thesubway station in the excavation process of deformation of three-dimensional finiteelement analysis, finite element analysis of deformation curves are basically consistentwith the measured curve.(5) obtained using the previous rules for Qingdao Metro Line3station excavationsupport system for analysis, obtained in the design phase must be considered, and theorganization of the construction should follow the principle. For the excavation toachieve better economy, construction safety, provide the basis.