平顶隧道下穿人防隧道的影响研究

Analysis of the Impacts of Flat-topped Tunnel Passing Civil Air Defense Tunnel

以青岛某段新建平顶隧道下穿"回字形"既有人防隧道为例,采用三维有限元方法对此段隧道的三导洞开挖方式进行数值模拟.开挖过程中引起的人防隧道变形,严重时可能导致地层倒塌,与此同时,由于受既有人防隧道的影响,新建隧道的衬砌可能会受到受力及变形影响、对此进行分析,为设计与施工提出合理建议,也为类似工程施工提供参考.

This paper takes a new flat-topped tunnel excavation in Qingdao passing an existing circle-like civil air defense tunnel as an example and adopts the three-dimensional finite element mode to implement a numerical simulation on the three heading excavating method of this tunnel. The excavation process will cause deformity of the civil air detense tunnel, and even lead to stratum collapse in some serious cases. Meanwhile, due to the influence of the existing civil air defense tunnel, the lining of the newly-buih tunnel may be deformed and even destructed hecause of the impact of stress. Thus, considering the overall factors and carrying out an analysis will provide reasonable suggestions for both the design and construction and references for similar engineering constructions.