|Table of Contents|

Effect of ground surface surcharge on longitudinal deformation of existing shield tunnel(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年03期
Page:
130-141
Research Field:
隧道工程
Publishing date:

Info

Title:
Effect of ground surface surcharge on longitudinal deformation of existing shield tunnel
Author(s):
LIANG Rongzhu1; 2; 3;  WANG Lixiang1;  LI Zhongchao2;  KANG Cheng1;  GAO Kun4; 5;  KE Zhaibang4; 5
(1. Faculty of Engineering, China University of Geosciences(Wuhan), Wuhan 430074, Hubei, China; 2. Wuhan Municipal Construction Group Co., Ltd., Wuhan 430023, Hubei, China; 3.School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China; 4. Anhui Institute of Building Research & Design, Hefei 230031, Anhui, China; 5. Anhui Province Key Laboratory of Green Building and Assembly Construction, Hefei 230031, Anhui, China)
Keywords:
ground surface surcharge;  shield tunnel deformation;  nonlinear Pasternak foundation model;  joint discontinuous shield tunnel calculation model
PACS:
TU344
DOI:
10.19815/j.jace.2022.02062
Abstract:
The ground surface surcharge caused by the dumped soil from temporary excavation and construction wastes have adverse impacts on the shield tunnel and can threaten the safe operation of the shield tunnel. Therefore, it is necessary to evaluate shield tunnel deformation subjected to surface surcharge. The nonlinear characteristics of soil deformation were considered by nonlinear Pasternak foundation model. The influence of shield tunnel segmental ring joint was considered by the joint discontinuous shield tunnel calculation model. Using the two-stage method, a simplified calculation method of longitudinal deformation of shield tunnel under surface surcharge was derived. Firstly, the additional pressure imposed on the shield tunnel was estimated by Boussineq's solution. Secondly, based on the joint discontinuous shield tunnel model, the longitudinal deformation equation of the shield tunnel under surface surcharge was derived by imposing the additional pressure, and the equation was solved using the finite difference method. Finally, the rationality of the proposed method was verified by two engineering cases. The results show that the increase of the rotational stiffness of shield tunnel segmental ring joint has little effect on the reduction of the tunnel settlement, but it can effectively reduce the joint opening. Increasing the surcharge length will increase the settlement and settlement range of the shield tunnel at the same time, while increasing the surcharge width will only lead to a slow increase in the tunnel settlement but will not increase the tunnel settlement range. The increase of the distance between the surcharge boundary line and the tunnel axis will effectively decrease the settlement caused by surcharge.

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Last Update: 2023-05-20