Abstract
Shield method as one of the most commonly used method of tunnel construction at present has been in its economic, efficient, and the advantages of the minimum impact on the environment in tunnel and underground engineering, especially in the soft hard formation, maintain the excavation face stability is the key to shield tunnel construction. Use more physical field coupling analysis software COMSOL Multiphysic in hangzhou some engineering of large diameter shield wear under both the subway before the affected zone, draw a large diameter shield tunnel when compound formation through the surface subsidence value; To judge in urban areas and under the geological conditions of composite shield close down through both the risk and feasibility of the subway, to judge in urban areas and under the geological conditions of composite shield close down through both the risk and feasibility of the subway.
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