Analysis On Ground Settlement Caused By Qingdao Subway Tunnel Excavation Based On FLAC3D

In China today, with GDP’s high growth, China becomes the world’s secondlargest economy. And technological advancements, the people’s living standardsimprove, the pace of urbanization, traffic congestion has become a major problem ofthe city. In the high cost of land in the city, the ground is very valuable road space,with the improvement of people’s living standards, more and more private cars, anincrease of the growth of the vehicle and the road is extremely unbalanced, thegrowing problem of urban congestion. Subway traffic speed, and large capacity,smooth and efficient operation, comfortable ride, and do not take up floor space,features prominent huge advantage, has become the first choice of major urbandevelopment.City subway tunnel excavation will lead to many geotechnical problems,inevitably led to the disturbance of rock and soil, causing the formation subsidenceand deformation, surface damage buildings, roads, pipelines and other safe use,settlement deformation is too large even cause collapse accident must be theformation subsidence caused by subway construction process monitoring forecast andthus reasonable control.In this paper, based on Qingdao Wannianquan Road Station Metro Line-Licunstation line project, subway construction process monitoring and measurement data,with the use of numerical analysis software FLAC3D, studied the ground subsidencecaused by subway excavation. The main contents are as follows:1, through the study of the formation of metro tunnel construction disturbance,analyzes and generates an internal mechanism of land subsidence, summarized theresults of previous studies on the law of the land subsidence caused by tunneling,combined with years of Qingdao Springs Road subway station-station interval LIactual construction situation, analyze the cause of land subsidence caused by theproject and analyzes the law of settlement curve.2, combined with FLAC3Dnumerical analysis software, according to the Metrosection of engineering geology, hydrogeology data, subway construction survey reports, select the3D model a typical cross-section of the tunnel, on the groundsubsidence caused by the construction process were analyzed.3, according to the Metro construction process monitoring and measurement data,summarize the results of comparative research analysis and numerical analysis duringexcavation and land subsidence caused by the law. Settler tunneling caused normallydistributed, and as time progresses, after first slow sedimentation rate fast.