The Impact On The Near The Subway Deep Foundation Pit And Underground Structure Research

Xintian Garden Plaza is located in the foundation pit of Zhengzhou Metro Line 2 radio stations to Xinlong Road station interval line west of the right line,the red line from the pit interval line closest to 35 m, retaining structure horizontal distance from the center line of the right line from about 33 to 50 m.On the basis of the foundation pit engineering, deep foundation pit supporting structure, adjacent subway structure and soil as a whole structure, using the method of numerical simulation, the finite element software MIDAS/GTS field data by combining the study of deformation rule of deep foundation pit supporting structure and surrounding soil and adjacent subway structure.The main work is as follows:1 analyze and summarize the field monitoring data, and compare the difference between the monitoring results and the simulation results.2 using MIDAS/GTS finite element software to establish the finite element model with the actual engineering, and analyze the simulation results(stress,strain, etc.), and analyze the influence factors.Through the above work, the following main research results are obtained:1 with the increase of the depth of excavation of deep foundation pit, the horizontal displacement and deformation of the pile anchor support structure increases, and the position of the maximum horizontal displacement decreases. The lateral displacement curve of pile anchor support structure presents two small, middle large drum belly shape.2 that with the increase of deep foundation pit excavation depth, gradually increasing the surface within the scope of the settlement, a distance of 22.5meters at a distance of maximum ground settlement of deep foundation pit excavation boundary, and the maximum surface settlement position does not change, at a distance of 3 times the depth of excavation of deep cutting in the field of settlement is almost zero.The 3 and four layers of foundation pit of underground structure after the completion of the construction, the existing subway line No. 2 tunnel structure the total deformation value is 5.11mm% D=30mm(D for the metro tunnel diameter), meet the shield tunnel lining ring diameter ovality less than 5 per thousand D, is in the safe range of deformation of tunnel.Based on the data simulation and monitoring, this paper studies the influence of the construction of deep foundation pit and underground four layer structure on the adjacent metro tunnel structure, which can provide reference for similar projects.