已有工程监测资料充分反映了盾构法隧道、尤以大直径的盾构法隧道,在施工完成后的相当长时间内,均会产生上浮。本文将从隧道施工过程中,初始地层应力状态被破坏、洞周应力被部分释放、形成“下大上小的不均匀”应力状态着手,研究隧道衬砌(其重量远小于被开挖土体重量)上浮的必然性和力学机理。 The existing engineering monitoring data fully reflects the shield tunneling method, especially the tunnel tunneling method with large diameter. In the long time after the construction is completed, the tunneling method will be floated. In the process of tunnel construction, the stress state of the initial formation is destroyed, and the stress around the cavity is partially released to form a “large and small non-uniform” stress state. The tunnel lining (whose weight is much smaller than the excavation soil Body weight) the inevitability of floating and mechanical mechanism.