姜之阳, 张彬, 刘硕, 等. 2022. 大断面矩形顶管上跨施工对既有地铁隧道变形影响研究[J]. 工程地质学报, 30(5): 1703-1712. doi: 10.13544/j.cnki.jeg.2022-0452.
    引用本文: 姜之阳, 张彬, 刘硕, 等. 2022. 大断面矩形顶管上跨施工对既有地铁隧道变形影响研究[J]. 工程地质学报, 30(5): 1703-1712. doi: 10.13544/j.cnki.jeg.2022-0452.
    Jiang Zhiyang, Zhang Bin, Liu Shuo, et al. 2022. Influence of large-section rectangular pipe jacking on deformation of existing subway tunnels[J]. Journal of Engineering Geology, 30(5): 1703-1712. doi: 10.13544/j.cnki.jeg.2022-0452.
    Citation: Jiang Zhiyang, Zhang Bin, Liu Shuo, et al. 2022. Influence of large-section rectangular pipe jacking on deformation of existing subway tunnels[J]. Journal of Engineering Geology, 30(5): 1703-1712. doi: 10.13544/j.cnki.jeg.2022-0452.

    大断面矩形顶管上跨施工对既有地铁隧道变形影响研究

    INFLUENCE OF LARGE-SECTION RECTANGULAR PIPE JACKING ON DEFORMATION OF EXISTING SUBWAY TUNNELS

    • 摘要: 大断面矩形顶管上跨既有地铁隧道施工过程中,由于近距离开挖出土卸荷,导致既有地铁隧道产生上浮变形,危及地铁运营安全。本文以北京市通州区畅和西路(兆善大街—潞阳大街)综合管廊矩形顶管工程为背景,采用FLAC3D有限差分软件建立了大断面矩形顶管上跨既有地铁隧道的三维数值模型,研究了双线矩形顶管上跨施工引起地铁隧道上浮的变形规律以及采用不同抗浮配重对既有地铁隧道的变形影响,并将模拟结果与现场监测数据进行对比,验证了数值模型的准确性。研究结果表明:双线顶管上跨施工引起地铁隧道的上浮变形大于单线顶管引起的上浮变形,且最大上浮变形均位于顶管隧道轴线处;施加与开挖损失土体近似重量的配重,可改变地铁隧道原有水平变形规律,导致先穿越的地铁隧道整体向始发井方向移动,后穿越的地铁隧道整体向接收井方向移动。随抗浮配重的增加,地铁隧道上浮位移减小,所受拉应力减小,且施加开挖损失土体重量50%的抗浮配重,可以将地铁上浮变形控制在1.4 mm以内;研究成果为该工程地铁隧道抗浮设计提供了参考依据。

       

      Abstract: During the construction of a large section rectangular pipe jacking over an existing subway tunnel,the unloading effect caused by the close excavation of the soil leads to the floating deformation of the existing subway tunnel,which can endanger the safety of subway operation. In order to study the influence of the large-section rectangular pipe jacking construction on the deformation of existing subway tunnels,this paper takes the rectangular pipe jacking project of the comprehensive pipe corridor in Changhe West Road(Zhaoshan Street~Luyang Street),Tongzhou District,Beijing as research project. This paper uses FLAC3D finite difference software,establishes a 3D numerical model of a large section rectangular pipe jacking over an existing subway tunnel and studies the floating deformation pattern of the subway tunnel caused by double-line rectangular pipe jacking construction and the influence of different anti-floating weights on the deformation of the existing subway tunnel. The simulation results are compared with on-site monitoring data to verify the accuracy of the numerical model. The results show that the floating deformation of the subway tunnel caused by the double-line pipe jacking construction is larger than that caused by the single-line pipe jacking. The maximum floating deformation is located at the axis of the pipe jacking tunnel. When a counterweight similar to the weight of the soil lost by excavation is applied,the original horizontal deformation pattern of the subway tunnel can be changed as follows. (1)The subway tunnel that has been traversed first moves to the direction of the originating shaft; (2)The subway tunnel that has been traversed later moves to the direction of the receiving shaft. Floating deformation and tensile stress of subway tunnel decrease with the increase of anti-floating weights. Applying anti-floating weight of 50% of the lost soil weight during excavation can control the floating deformation of the subway tunnel within 1.4 mm. The results provide a reference for the anti-floating design of the subway tunnel in this project.

       

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