Research On45m Deep Foundation Pit Support Scheme In Chongqing Rail Line Six Jiangbei Cheng Station

In recent years, with the rapid development of our economy and the progress of thesociety, the basic construction scale is gradually increasing in our country, high-risebuildings, underground construction, tunnels and other projects has greatly increased. Inorder to save space on the ground, saves the land, make full use of underground space ofthe deep foundation pit engineering increase, which makes the deep foundation pitengineering construction problems on technical and economic construction plays a veryimportant influence on the whole.Deep foundation pit engineering is currently one of the difficult and hot issue in thefield of geotechnical engineering. Under the premise of the rapid development of urbanrail transit, the subway station often has a deep foundation pit engineering, under thecondition of complex environment, how to make the influence of the deep foundationpit engineering on the surrounding buildings within the range of engineeringspecification requirements, so as to guarantee the safety of deep foundation pitengineering and building.After reading a large number of domestic and foreign literature, on the basis ofsummarizing research achievements, this paper takes chongqing rail transit line6jiangbei town station deep foundation pit engineering as the background, in view of thestructure in the process of excavation and supporting of foundation pit deformation andearth pressure and the performance of the conducted in-depth research, at the same time,using the large finite element software ANSYS to establish a three-dimensional modelof deep foundation pit is calculated under three different support scheme of mechanicalbehavior, concluded the optimum construction scheme, the main work and researchcontent of this paper is as follows:①using the finite element software ANSYS to establish45m deep foundation pitsupport in anchor rod retaining wall under the action of the finite element model, theanalysis of deep foundation pit support in anchor rod retaining wall under the action ofsoil displacement, soil stress, anchor rod retaining wall, vertical stress and the horizontaldisplacement on the anchor rod retaining wall.②using the finite element software ANSYS to establish45m deep foundation pitin anchor pile support under the action of the finite element model, the analysis of deepfoundation pit in anchor pile supporting pile displacement and stress of soil and soil under the action of vertical stress, the horizontal displacement of pile and prestressedanchor axial force.③45m using finite element software ANSYS to establish finite element model ofdeep foundation pit under the effect of the anti-slide pile supporting, analysis of deepfoundation pit under the effect of the anti-slide pile supporting soil displacement andstress of soil horizontal displacement, vertical stress of pile, pile.④monitor the result of the measurement and finite element software analysisresults were analyzed.View of the rail transit line6in chongqing jiangbei town45m subway station deepfoundation pit supporting technology research, this paper obtained the45m deepfoundation pit under three different support scheme of stress analysis, throughcomparing the anchor pile and anti-slide pile and closer to the measured values, andmeet the requirements of specification, but the anchor pile project belongs to the activecontrol of soil deformation, integrated the advantages of the two structures of anti-slidepile and prestressed anchor cable, also save investment, for optimal scheme. By usingmonitoring technology is analyzed, the results of monitoring data and numericalsimulation of three dimensional finite element analysis results are compared andanalyzed the causes of error and verify the reliability of the finite element analysis.