盾构隧道通缝拼装管片错台的理论分析

Theoretical Analysis on Faulted Slabs of Straight-joint Assembled Segment for Shield Tunnel

摘要:

随着盾构法隧道施工技术的发展和众多问题的解决，管片错台引起的管片开裂、拼装困难和防水隐患等问题对施工和运营的影响日益凸显，对工程质量有直接的影响。盾构隧道管片的错台主要归因于隧道管片间的差异性位移。分析以上海轨道交通二号线西延段盾构隧道工程为背景，在对隧道的不同类型的管片详细的受力分析的基础上，运用达朗贝尔原理对管片的位移进行了理论分析。最后，分析得出了不同类型管片的位移计算公式，并推导得出了管片之间的错台公式。该公式描述了管片错台与管片受力、弹性密封垫性质等因素的一个定量关系，为消除盾构隧道管片在推进过程中的错台，确保施工精度，提高工程质量提供了理论依据。

Abstract:

With the development of shield tunneling construction technology and the solution of many problems, the problems of segment cracking, assembly difficulty and waterproof hidden danger caused by the faulted slabs of segment affect the construction and operation increasingly, which has the direct impact on the engineering quality. The faulted slabs of shield tunnel segment are mainly attributed to the differential displacement between the tunnel segments. Taking Shanghai Metro Line II West Extension Shield Tunnel Project as the background, on the basis of analyzing the stress of the different tunnel segments in detail, the D' Alembert principle is used to theoretically analyze the segment displacement. Finally, the calculation formula of the displacement for the different types of segments is analyzed and given, and the formula of faulted slabs between the segments is deduced. This formula shows out a ration relation among the faulted slab segment, segment stress, elastic gasket property and other factors in order to provide the theoretical basis for eliminating the faulted slab in the tunneling process of shield tunnel segments, ensuring the constructing precision and improving the construction quality.