Stability Analysis Of Subway Foundation Pit Based On Monitoring Data

In recent years,with the rapid increase of urban population and the increasing scale of cities in our country,the traffic problem is becoming more and more serious.In order to alleviate this problem,people turn their attention to the development and utilization of underground space.Subway transportation brings people convenience,but also can cause the risk of construction.In this paper,based on the Beijing metro line eight Dahongmen subway station construction,through Midas/GTS finite element software engineering is analyzed,compared with the actual test data,verify the reference value of numerical simulation.Through the simulation of different construction conditions,the maximum deformation monitoring point of the foundation pit is determined,and the deformation caused by different construction stages is analyzed.The research contents of this paper are as follows:The stability and deformation of the ground,support structure and steel structure support system in the working condition are monitored.The monitoring data and MADAS design predictive value are analyzed and compared.Optimize the design program,is conducive to targeted improvement of construction technology and safety construction.According to the monitoring of the adjacent buildings,according to the development trend of the underground pipeline and the deformation of the ground surface,the protective measures should be taken.Conducive to the construction of timely and effective protection of the structural deformation,strictly controlled within the standard line,to ensure the normal use of underground pipelines into the building and safety and stability.(1)based on the Beijing metro line eight Dahongmen subway station foundation pit construction as an example the collection of field data,the monitoring data and the estimated value of MADAS design are analyzed and compared,verified reference value of numerical simulation,analysis of differential settlement causes.(2)through the measured data and simulation results,the deformation of the foundation pit and the maximum deformation of adjacent buildings and their positions are determined.(3)by simulating different buried depth of underground continuous wall,the influence of the buried depth of the foundation pit stability,determine the safety and depth of the economic,scientific practice,embedded depth.(4)the excavation process,there are many factors affecting the settlement deformation,through numerical simulation analysis of excavation method in different construction stages,through the settlement data comparison,determine the most suitable excavation method in the construction of engineering construction optimization.