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Numerical Analysis of the Construction Scheme for Large-span Exit Section of the Pengshui Tunnel in Chongqing-Huaihua Railway

LEI Sheng xiang et al.  
Two dimensional finite element computation is performed to simulate the driving process of large span exit section of Pengshui Tunnel in Yuhai Railway by means of Center Diaphragms (CD) and Bottom Drift with Upper Annular Benching (BDUAB) method. The comparison of varying features of ground subsidence, plastic zone in surrounding soil and roof settlement of tunnel lining induced by construction of the large span exit between the two tunneling methods has been carried out. The obtained results show that the adoption of BDUAB method is much more safe and rational than the CD method to excavate the exit section of Pengshui tunnel. Therefore, the BDUAB method is highly recommended to excavate the exit section of the tunnel.
【CateGory Index】: U455.4
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