Analysis of longitudinal displacement of existing shield tunnel due to construction of above-crossing new tunnel considering the weakening of circumferential joint

被引：0
|
作者：
Zhang Z. [1 ]
Liang R. [1 ]
Gao K. [2 ,3 ]
Li Z. [4 ]
Xiao M. [4 ]
Guo Y. [2 ,3 ]
Yue T. [2 ,3 ]
Wu W. [1 ]
机构：
[1] Faculty of Engineering, China University of Geosciences, Wuhan
[2] Anhui Province Institute of Building Research and Design, Hefei
[3] Anhui Key Laboratory of Green Building and Assembly Construction, Hefei
[4] Wuhan Municipal Construction Group Co., Ltd., Wuhan
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2022年 / 41卷
关键词：
Above-crossing tunnelling; Existing shield tunnel; Joint discontinuous shield tunnel model; Nonlinear foundation model; Tunnelling engineering; Weakening of circumferential joint;
D O I：
10.13722/j.cnki.jrme.2021.0275
中图分类号：
学科分类号：
摘要：
Exploring the longitudinal deformation mechanism of the existing shield due to construction of new tunnel above is significant to assess the adverse impacts of above-crossing tunnelling on the existing shield tunnel. Current analytical methods commonly simplify the existing shield tunnel as an equivalent continuous beam resting on a linear elastic foundation, of which will overlook the weakening of circumferential joint and the nonlinear deformation characteristics of the ground. Firstly, the joint discontinuous shield tunnel model and the nonlinear Pasternak foundation model are adopted to consider the weakening of circumferential joint and the tunnel-soil nonlinear interaction. The differential equation for shield tunnel longitudinal deformation owing to above-crossing tunnelling is derived. Secondly, the numerical solution for shield tunnel longitudinal deformation is solved using the finite difference method and the Newton's iteration method. Finally, the predictions from the proposed method are compared with two field cases and the results predicted by the current equivalent continuous beam model. It shows that the longitudinal deformation and the bending moment based on the equivalent continuous beam model express continuous characteristics. While the longitudinal deformation and the bending moment predicted by the proposed method can reflect the discontinuous characteristics, because the weakening of circumferential joint is considered by the proposed method. The results obtained by the proposed method is much closer to the real shield tunnel deformation characteristics. Through the parametric analyses, it is found that increasing the clearance distance between the new and old tunnels will effectively reduce the tunnel heave, bending moment and joint opening. By increasing the length of segment ring, the tunnel heave will decrease slightly, but the joint opening and bending moment will increase. To increasing the stiffness of the circumferential joint will effectively lead to the decrease of tunnel vertical displacement and opening of joint, but it will increase the bending moment of tunnel. © 2022, Science Press. All right reserved.
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页码：2955 / 2970
页数：15
相关论文
共 26 条
  • [1] Overview of urban rail transit lines in mainland China in 2020
  • [2] HANSMIRE W H, PARKER H W, GHAHOUSSI J, Et al., Effects of shield tunnelling over subways, Proceedings of the Third Rapid Excavation and Tunnelling Conference, pp. 224-276, (1981)
  • [3] GHABOUSSI J, HANSMIRE W H, PARKER H W, Et al., Finite element simulation of tunneling over subways, Journal of Geotechnical Engineering, 109, 3, pp. 318-334, (1983)
  • [4] ZHANG D W, LIU BO, QIN Y J., Construction of a large-section long pedestrian underpass using pipe jacking in muddy silty clay: A case study, Tunneling and Underground Space Technology, 60, 11, pp. 151-164, (2016)
  • [5] WANG Jianchen, ZHANG Dingli, ZHANG Chengping, Et al., Existing tunnel's deformation of superincumbent subway station induced by approaching excavation in shallow depth, Journal of Beijing Jiaotong University, 38, 1, pp. 8-12, (2014)
  • [6] LIU Jianguo, XU Tianhua, SONG Chengpeng, Construction techniques of shield tunnels approaching existing metro tunnels in soft ground at seafront areas, Modern Tunneling Technology, 56, 4, pp. 160-166, (2019)
  • [7] HUANG Dezhong, MA Xianfeng, WANG Junsong, Et al., Centrifuge modelling of effects of shield tunnels on existing tunnels in soft clay, Chinese Journal of Geotechnical Engineering, 34, 3, pp. 520-526, (2012)
  • [8] LI P, DU S J, MA X F, Et al., Centrifuge investigation into the effect of new shield tunnelling on an existing underlying large-diameter tunnel, Tunnelling and Underground Space Technology, 42, 5, pp. 59-66, (2014)
  • [9] ZHANG Xiaoqing, ZHANG Mengxi, LI Lin, Et al., Mechanism of approaching construction disturbance caused by multi-line overlapped shield tunneling, Rock and Soil Mechanics, 38, 4, pp. 1133-1140, (2017)
  • [10] LIU H Y, SMALL J C, CARTER J P, Et al., Effects of tunnelling on existing support systems of perpendicularly crossing tunnels, Computers and Geotechnics, 36, 5, pp. 880-894, (2009)
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