Analysis Of The Influence Of Different Construction Methods On The Support Structure Of Subway Station

With the speeding up of urbanization in our country, the project of deep foundation pit in subway station, high-rise buildings and municipal engineering application is increasingly wide. Based on metro line 1 hefei mingguang road station deep foundation pit for the engineering background, discusses the subway station under the different construction methods of underground continuous wall accumulative deformation of impact analysis. Main work and conclusions are as follows:(1) The deformation mechanism of foundation pit supporting structure are analyzed, and systematically summed up some factors influencing foundation pit deformation, the main influence factors including the excavation depth, embedded depth, overload and support, etc.(2) In hefei metro line 1 mingguang road station as engineering background, the engineering general situation has carried on the simple introduction, including the basic situation of the station, engineering geological and hydrogeological conditions, poor geological conditions, deformation monitoring scheme, etc.(3) The foundation pit deformation analysis method and the finite element software MIDAS/GTS basic application and calculation principle, and on this basis to determine the construction parameters and construction procedure of modeling.(4) Using MIDAS/GTS software in combination with the practical construction situation of mingguang road cut and suitable practice construction stage model is established, and the underground continuous wall accumulative deformation simulation results and the actual monitoring results contrast analysis, the simulation results and the actual monitoring results in underground continuous wall on the accumulative deformation of all present a consistent rule, namely the maximum horizontal displacement occurred in the depth of the foundation pit of 1/2, and the maximal displacement numerical simulations and some actual monitoring stations monitoring numerical difference is not big, verified the model under the condition of the accuracy and reliability.(5) Under the condition of changing construction way, using MIDAS/GTS software again under the way of building the subway station cover dig uni-axial construction model, compare under different construction methods of underground continuous wall of the accumulative deformation as a result, it is concluded that under two different construction method of underground continuous wall cumulative displacement presents different rules, cut along the practice of construction when the maximum displacement occurred in 1/2, the depth of the foundation pit cover digging the uni-axial the largest displacement occurs in the bottom of the foundation pit, but under the two different ways of underground continuous wall accumulated maximum horizontal displacement of the numerical difference is very small, cut and suitable practice 4.45 mm, respectively, dig uni-axial 4.24 mm cover.