Numerical Analysis Lanzhou Subway Station Deep Excavation And Study The Impact On The Surrounding Pipes Precipitation

One line subway station in Lanzhou main city of the east-west line from the Ring Road West, Shek Kong solid area north of the West, East Donggang, via petrochemical plant, Chen government-run, three beach areas, the West Railway Station, West off even the word, The East is Red Square planned route length of approximately34km, the deepest pit of metro station23.97m, most shallow there14.06m. Subway stations are built in the heart of downtown, surrounded by a variety of intricate underground pipes, improper protection measures should the excavation, underground pipeline will cause rupture, causing incalculable economic losses. So study the impact on the surrounding excavation of underground pipelines for Maryland Metro Pit is particularly important..This paper depends on the project that "The selection of supporting structure of subway station foundation pit and treatment measures of groundwater in Lanzhou ". In combination with subway station deep foundation pit engineering in Lanzhou, this paper analyzed the internal force of retaining structure of deep excavation in metro station using the finite element software MIDAS/GTS. It also analyzed the pile bending moment and displacement of the steel support, axial forces and the settlement of surrounding soils. This paper analyzed the displacements of underground pipeline in the process of excavation and precipitation station using the finite element software Adina. The main research contents of this Paper can be divided into the following several aspects:(1) Using the finite element software MIDAS/GTS establish plus the support for the piles supporting structure subway foundation model to analyze the bending moment and displacement, axial force of steel supports and the surrounding soil subsidence, and then come to support structural changes of the internal forces.(2) This paper analysis the influence to surrounding displacement of underground pipeline of deep foundation pit excavation of a metro station by using the finite element software ADINA. This paper analyzes three different positions of underground pipeline, and summarizes its change law.(3) With the establishment of finite element software ADINA pit dimensional finite element model of1/2, through the deep excavation analysis of precipitation, summed up the pore water pressure and deformation of underground pipes around foundation soil, indicating deep open pit digging a significant effect on the precipitation in the deformation of the surrounding underground pipeline.(4) Through monitoring data of a practical engineering example of pipeline, it summary Pipeline deformation law and compared with the numerical simulation and analysis of the difference and its reason.