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  Stress Field due to Excavation and Development of Excavation Method for the Mountain Subway Station

  Many complex subway stations were built in Chongqing city of China and the span was very large, in order to study the effect of different excavation order on the stress field in surrounding ground, this paper used Midas GTS software to simulate the different excavation process. Additionally, in order to ensure the excavation stability, the frequently-used methods, i.e. the CD method, the CRD method and the pilot tunnel method, could not satisfied the requirements, so a new excavation method was proposed and this paper researched on the effect degree of the pilot tunnel method (DPTM) and new method (PTSM) on the ground deformation, which verified that the new method is effective and can provide reference for building subway station in the analogous areas. KEYWORDS: mountain subway station, excavation method, stress distribution property, stress field

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