The excavation of a foundation pit will cause soil unloading, resulting in the structural deformation of underlying tunnels, which affects the safety of tunnel operation. Here, the impact of foundation pit excavation on the structural deformation of the metro interval tunnel underlying a foundation pit support project for a storage pond is analyzed through theoretical analysis, numerical simulation, and on-site monitoring, and corresponding safety control measures are proposed. The research shows that simplifying the tunnel into an infinite-length Euler–Bernoulli beam resting on the Kerr foundation model has good rationality and applicability when analyzing the impact of pit construction on the deformation of the interval tunnel. The distance between the foundation pit and the tunnel cross-section significantly affects the deformation of the tunnel structure, and the shorter the straight-line distance from the pit foundation, the more obvious the structural deformation of the interval tunnel. The maximum deformation of the tunnel structure occurs in the upper-left area of the middle of the tunnel near the foundation pit, and the deformation shows a nonlinear decreasing trend toward the two ends of the tunnel. Timely support can effectively inhibit the deformation of the foundation pit, and the spatial and temporal effects of foundation pit excavation on the underlying tunnels should be minimized during construction. The impact on the structural deformation of the underlying tunnels should be mitigated in strict accordance with the three-level control principle: early warning, alarm, and control. The research results provide a reference for guiding foundation pit construction.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Analysis of the Impact of Foundation Pit Construction on the Deformation of Underlying Metro Tunnels


    Additional title:

    Transportation Research Record: Journal of the Transportation Research Board


    Contributors:
    Wang, Lin (author) / Xu, Peng (author) / Ma, Zhenshuo (author) / Yang, Ruisong (author) / Liu, Pingfei (author)


    Publication date :

    2024-11-11




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Deformation Response of Metro Tunnels to Adjacent Tram Track Construction

    Shan, Yao / Zhou, Shunhua / Gong, Quanmei et al. | ASCE | 2018


    Numerical Analysis of Effects of Foundation Pit Excavation on Metro Tunnels

    Huo, Zhiliang / Yan, Shuwang / Zhang, Qibin | ASCE | 2014


    Metro Santiago - Design and construction of shallow tunnels

    Gomes, Alexandre R.A. / Pimentel, Karla C.A. / Houska, Michael | Tema Archive | 2008