Research On The Effect Of Open Excavation Contact Channel To The Existing Subway Station Structure

With the gradual acceleration of China’s city construction, city subway construction is also in constant development. The underground space has become an important natural resource of the city. With the development of the underground space, the construction of the subway has been facing more complicated underground environment. Influence of the new underground engineering of subway structure in the vicinity is a common problem in subway construction. The construction of new subway structure, not only to ensure their own safety,but also to ensure the adjacent underground structure safety and normal use. Therefore,accurate judgment of new influence of existing subway structure deformation and internal force of underground structure, to ensure smooth project safety is of great significance.This will be the No. fourteen subway line will carry on the research of excavation station contact channel, analysis of excavation deformation and its excavation of contact channel impact on the existing subway station, and the influence of different construction methods on deformation and internal force of the existing station. The main contents of this paper are as follows:(1) Summarize the deformation law of surrounding soil due to excavation, the excavation deformation prediction method of foundation pit. Summary of foundation pit excavation onexisting control station deformation index.(2) Divided into excavation: cut pile scheme and not cut pile scheme, analysis of the two schemes on both the deformation of the structure of the station, using the ANSYS software of these two schemes of foundation pit excavation numerical simulation, comparison of the two schemes of existing station structure deformation degree, so as to optimize the design scheme.(3) For the analysis of cutting pile scheme and not cutting pile scheme the impact of the station structure of the internal force, using MIDAS/GEN software for numerical simulation of these two schemes, comparing the two schemes of both impact force station structure, to optimize the design scheme.(4) The construction of the excavation monitoring data through the new contact channel excavation, comparative analysis, summed up the law and the results of numerical simulation,gives the main measures to control the deformation of foundation pit.