Simplified method for evaluating deformation responses of existing tunnels due to overlying basement excavation

被引：0
|
作者：
Cheng K. [1 ,2 ]
Xu R. [1 ,2 ]
Ying H. [1 ,2 ,3 ]
Liang R. [4 ]
Lin C. [5 ]
Gan X. [1 ,2 ]
机构：
[1] Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, 310058, Zhejiang
[2] Engineering Research Center of Urban Underground Development of Zhejiang Province, Hangzhou, 310058, Zhejiang
[3] Institute of Geotechnical Engineering Science, Hohai University, Nanjing, 210098, Jiangsu
[4] Faculty of Engineering, China University of Geosciences(Wuhan), Wuhan, 430074, Hubei
[5] Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai
来源：
Ying, Hongwei (ice898@zju.edu.cn) | 1600年 / Academia Sinica卷 / 39期
基金：
中国国家自然科学基金;
关键词：
Displacement coupling; Euler-Bernoulli beam; Existing tunnel; Overlying basement; Simplified prediction formula; Tunnelling engineering;
D O I：
10.13722/j.cnki.jrme.2019.1074
中图分类号：
学科分类号：
摘要：
The excavation of the basement will break the original stress field of ground and hence has an unfavorable effect on the underlying tunnel. In this paper, a new simplified method is developed to evaluate the response of the existing tunnel duo to the unloading of the basement excavation. Firstly, the Euler Bernoulli beam resting on the Pasternak foundation was used to simulate the interaction between the existing tunnel and ground, and the coefficient of subgrade reaction considering the effect of the burial depth of the existing tunnel was adopted. Secondly, the ground displacement at the tunnel center induced by basement excavation was obtained with the application of Mindlin’s solution. Then, a deformation control equation of tunnels was established based on the displacement coupling condition between the existing tunnel and the ground. Finally, the solution of the longitudinal response of the existing tunnel caused by adjacent excavation was obtained using the finite difference method. The accuracy and applicability of the proposed method were verified by comparison with the three-dimensional finite element method analysis and theoretical solutions published in other literature, and the influence of different factors on tunnel response was analyzed including the tunnel buried depth, relative space position between the basement and the existing tunnel, the excavation depth of the basement, the geometry of the basement, the relative rigidity between the existing tunnel and the ground, etc. Finally, a simplified formula for predicting the maximum vertical displacement of the tunnel induced by excavation was presented. The results could provide some theoretical support for similar projects. © 2020, Science Press. All right reserved.
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页码：637 / 648
页数：11
相关论文
共 35 条
  • [1] ZHANG X, OU X, YANG J, Et al., Deformation response of an existing tunnel to upper excavation of foundation pit and associated dewatering, International Journal of Geomechanics, 17, 4, pp. 1-14, (2017)
  • [2] CHEN Renpeng, MENG Fanyan, LI Zhongchao, Et al., Considerable displacement and protective measures for metro tunnels adjacent deep excavation, Journal of Zhejiang University: Engineering Science, 50, 5, pp. 856-863, (2016)
  • [3] TAN Y, LU Y., Responses of shallowly buried pipelines to adjacent deep excavations in Shanghai soft ground, Journal of Pipeline Systems Engineering and Practice, 9, 2, (2018)
  • [4] ZHENG G, YANG X, ZHOU H, Et al., A simplified prediction method for evaluating tunnel displacement induced by laterally adjacent excavations, Computers and Geotechnics, 95, 3, pp. 119-128, (2018)
  • [5] ZHENG G, YANG X, ZHOU H, Et al., Reply to the discussion on “A simplified prediction method for evaluating tunnel displacement induced by laterally adjacent excavations” by Far et al, Computers and Geotechnics, 109, 5, (2019)
  • [6] SHI J, NG C W W, CHEN Y., Three-dimensional numerical parametric study of the influence of basement excavation on existing tunnel, Computers and Geotechnics, 63, 1, pp. 146-158, (2015)
  • [7] HUANG X, SCHWEIGER H F, HUANG H., Influence of deep excavations on nearby existing tunnels, International Journal of Geomechanics, 13, 2, pp. 170-180, (2013)
  • [8] KARKI R., Effects of deep excavation on circular tunnels in fine grained soils, (2006)
  • [9] ZHENG G, WEI S., Numerical analyses of influence of overlying pit excavation on existing tunnels, Journal of Central South University of Technology, 15, pp. 69-75, (2008)
  • [10] NG C W W, Sun HS, Lei GH, Et al., Ability of three different soil constitutive models to predict a tunnel's response to basement excavation[J], Canadian Geotechnical Journal, 52, 11, pp. 1685-1698, (2015)
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