Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (2): 635-644.doi: 10.16285/j.rsm.2019.0340

• Geotechnical Engineering • Previous Articles     Next Articles

Variations of transverse forces on nearby shield tunnel caused by foundation pits excavation

WEI Gang1, ZHANG Xin-hai2, LIN Xin-bei1, HUA Xin-xin3   

  1. 1. Department of Civil Engineering, Zhejiang University City College, Hangzhou, Zhejiang 310015, China; 2. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, Zhejiang 310058, China; 3. CREEC East China Survey and Design Co., Ltd., Hangzhou, Zhejiang 310004, China
  • Received:2019-02-13 Revised:2019-05-14 Online:2020-02-11 Published:2020-02-12
  • About author:WEI Gang, male, born in 1977, PhD, Professor, Research interest: the interaction between underground tunnels and the surrounding environment, and risk assessment and control. E-mail:weig@zucc.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51778576).

PDF (Chinese)

400

PDF (English)

50

Abstract: In order to study the influence of excavation near shield tunnels on the force of tunnel segments, the mechanism of surrounding pressure change on tunnels caused by nearby excavation is studied. A model of additional confining pressure redistribution is proposed which can describe the process of force-displacement-rebalancing of tunnels, and the calculation formula of additional confining pressure is deduced. The internal force of lining under the corresponding confining pressure is calculated by using the modified routine method. The influence of foundation pit excavation on the confining pressure and internal force of shield tunnels is studied based on the analysis of a practical engineering example, and the influencing factors are analyzed. The analysis results show that confining pressure of the tunnel before excavation presents a "bell shape" distribution. After excavation, the confining pressure on both sides of the tunnel decreases, and the confining pressure on the excavation side decreases more. The excavation of the foundation pit increases the positive and negative bending moments and the positive and negative shear forces of the nearby tunnel, and decreases the axial forces of the arch top and the arch bottom. With the increase of the stress release coefficient of the side wall of the foundation pit, both the absolute values of the additional confining pressure and of the additional bending moment will increase, and the response of bending moment to unloading of foundation pit excavation is more obvious. Shallow shield tunnel is more sensitive to the influence of the excavation of side foundation pit, and the influence of excavation of side foundation pit will decrease obviously when the burial depth of the tunnel is greater than that of the foundation pit excavation. With the increase of the distance between the foundation pit and the nearby tunnel, the influence of the foundation pit excavation on the tunnel will also be reduced.

Key words: foundation pits excavation, nearby shield tunnel, transverse force, redistribution of confining pressure, modified routine method

CLC Number: 

  • U 25
[1] ZHOU Peng-fa, SHEN Yu-sheng, GAO Deng, ZHANG Xi, HUANG Hai-feng, GAO Bo, . Explicit time-domain perfectly matched layers base on mixed finite element method [J]. Rock and Soil Mechanics, 2025, 46(5): 1605-1619.
[2] PAN Qiu-jing, WU Hong-tao, ZHANG Zi-long, SONG Ke-zhi, . Prediction of tunneling-induced ground surface settlement within composite strata using multi-physics-informed neural network [J]. Rock and Soil Mechanics, 2024, 45(2): 539-551.
[3] HOU Gong-yu, LI Zi-xiang, HU Ta, ZHOU Tian-ci, XIAO Hai-lin, . Study on monitoring error of distributed optical fiber using fixed-point layout for tunnel deformation monitoring [J]. Rock and Soil Mechanics, 2020, 41(10): 3481-3490.
[4] BAO Han-ying, CHEN Wen-hua. Dynamic response of a saturated poroelastic medium due to a moving axial excitation in a lining tunnel [J]. , 2018, 39(10): 3735-3742.
[5] PENG Zu-zhao, FENG Kun, XIAO Ming-qing, HE Chuan, JIANG Chao, CHEN Huai-wei，. Reasonable overlying thickness of subaqueous tunnels based on pressure arch theory [J]. , 2018, 39(7): 2609-2616.
[6] WU Dong，GAO Bo，SHEN Yu-sheng，ZHOU Jia-mei. Shaking table test study of seismic dynamic response of tunnel entrance slope [J]. , 2014, 35(7): 1921-1928.
[7] YANG Xian ，ZHANG Ke-neng ，LI Yong-suo ，PENG Huan-yun ，HUANG Chang-bo . Theoretical and experimental analyses of jacking force during deep-buried pipe jacking [J]. , 2013, 34(3): 757-761.
[8] HE Ben-guo ，ZHU Yong-quan ，SUN Ming-lei ，ZHANG Zhi-qiang ，SUN Yuan-guo . Method for determining supporting load of deep tunnel on high-speed railway in gypsum breccia stratum [J]. , 2013, 34(3): 827-832.
[9] WEI Gang , HONG Jie , WEI Xin-jiang . Analysis of influence of DOT shield tunneling on existed adjacent tunnel [J]. , 2012, 33(S2): 98-104.
[10] YUAN Xiao-hui , HAN Yue-wang , ZHONG Xiao-chun. Numerical model building for consolidation deformation of cemented mortar for shield tail grouting [J]. , 2012, 33(3): 925-932.
[11] MA Hui , GAO Ming-zhong , ZHANG Jian-kang , YU Qi-fu. Theoretical model developed for equivalent elastic modulus estimation of cobblestone-soil matrix [J]. , 2011, 32(12): 3642-3646.
[12] LI Yong-suo , ZHANG Ke-neng , HUANG Chang-bo , LI Zhong , DENG Mei-long. Analysis of surface subsidence of tunnel built by pipe-roof pre-construction method [J]. , 2011, 32(12): 3701-3707.
[13] SHU Zhi-le , LIU Xin-rong , ZHU Cheng-hong , GUO Zi-hong , LI Xiao-hong. Study of model test about 3D GPR detection of tunnel lining cavity [J]. , 2011, 32(S1): 551-0558.
[14] GUO Jun，WANG Ming-nian，TAN Zhong-sheng，LUO Lu-sen. Anchoring mechanism and effect of systematic rockbolt for shallow buried loess tunnel [J]. , 2010, 31(3): 870-874.
[15] DU Ju-hong，HUANG Hong-wei. Dynamic simulation analysis of displacement field of bias closely spaced tunnel with altitude difference [J]. , 2009, 30(4): 1102-1108.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
No Suggested Reading articles found!
Copyright © Rock and Soil Mechanics, All Rights Reserved.
Tel: 027-87198484　E-mail: ytlx@whrsm.ac.cn
Powered by Beijing Magtech Co. Ltd