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WANG Li-xiang, LIANG Rong-zhu, LI Zhong-chao, KANG Cheng, XIAO Ming-zhao, WU Wen-bing, GAO Kun, GUO Yang. HEAVE DEFORMATION OF EXISTING SHIELD TUNNEL INDUCED BY OVER-CROSSING EXCAVATION[J]. Engineering Mechanics, 2022, 39(12): 130-140. DOI: 10.6052/j.issn.1000-4750.2021.07.0547
Citation: WANG Li-xiang, LIANG Rong-zhu, LI Zhong-chao, KANG Cheng, XIAO Ming-zhao, WU Wen-bing, GAO Kun, GUO Yang. HEAVE DEFORMATION OF EXISTING SHIELD TUNNEL INDUCED BY OVER-CROSSING EXCAVATION[J]. Engineering Mechanics, 2022, 39(12): 130-140. DOI: 10.6052/j.issn.1000-4750.2021.07.0547
shu

HEAVE DEFORMATION OF EXISTING SHIELD TUNNEL INDUCED BY OVER-CROSSING EXCAVATION

  • 1.

    Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China

  • 2.

    Wuhan Municipal Construction Group Co., Ltd., Wuhan, Hubei 430023, China

  • 3.

    Anhui Institute of Building Research & Design, Hefei, Anhui 230031, China

  • 4.

    Anhui Key Laboratory of Green Building and Assembly Construction, Hefei, Anhui 230031, China

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  • Received Date: July 16, 2021
  • Revised Date: October 19, 2021
  • Accepted Date: November 01, 2021
  • Available Online: November 01, 2021
    Graphical Abstract
    • Abstract
  • Over-crossing excavation will cause the heave deformation of existing shield tunnels and endanger the service performance of existing shield tunnels. The current analytical methods for predicting the heave deformation of a shield tunnel due to excavation always consider the shield tunnel as an elastic continuous beam resting on an elastic foundation model, which overlook the effect of the joint between adjacent rings. Thusly, a shield tunnel model with adjacent joints is proposed. The nonlinear characteristics of soil deformation are considered by nonlinear Pasternak foundation model. Through the two-stage analysis method, the simplified solutions of heave displacement and opening of shield tunnel under the action of upper span excavation of foundation pit are derived. The additional unloading pressure on shield tunnel due to excavation is calculated using MINDLIN’s elastic solution. The differential equation of heave deformation of the shield tunnel due to exerted unloading pressure is established. The heave deformation and internal force distribution of the adjacent shield tunnel caused by excavation are obtained by using the finite difference method. The measured results from three well-documented published cases are collected, and then the prediction from proposed method is compared with the measured results and the prediction from existing methods to verify the applicability of the proposed method.
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    • References (26)
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