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Volume 38 Issue z2
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ZHANG Zhi-guo, YANG Xuan, ZHAO Qi-hua, BAI Qiao-mu. Assessment and modification of traditional methods for ground displacements induced by shield tunneling[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(z2): 272-279. DOI: 10.11779/CJGE2016S2045
Citation: ZHANG Zhi-guo, YANG Xuan, ZHAO Qi-hua, BAI Qiao-mu. Assessment and modification of traditional methods for ground displacements induced by shield tunneling[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(z2): 272-279. DOI: 10.11779/CJGE2016S2045
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Assessment and modification of traditional methods for ground displacements induced by shield tunneling

  • 1. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China;
    2. State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China;
    3. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China

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  • Received Date: May 18, 2016
  • Published Date: October 19, 2016
    Graphical Abstract
    • Abstract
  • The issue of soil displacements caused by shield excavation is the hot topic in academic and engineering fields. Firstly, the traditional computation theories of soil vertical displacements are introduced. The ground surface settlements of 5 classical shield tunnels are calculated and analyzed. The analysis results show that: the fitting precision of Peck equation, Yoshikoshi method and Celestino method is higher, and the maximum settlements calculated by Loganathan & Poulos method are a little less than the measured data. The calculated results by Sagaseta method are mostly the same with those by Verruijt & Booker, while the maximum settlement is obviously small. The calculated results of Park method for shallow tunnel match well with the measured data. Secondly, based on cases of measured data of surface settlements, the modified fitting formula of width coefficient is of soil surface settlement trough is obtained. The formula is related to the tunnel radius R, axis depth h and soil conditions (internal friction angle φ of soil). The value of is is linear with R+h tan(45°-φ/2). In addition, according to the statistical analyses of some cases of measured data of subsurface settlements, the modified fitting formula for width coefficient iz of subsurface settlement trough is acquired. The formula for relationship between iz/is and hz/T is the logarithmic function (hz is ground depth and T is thickness of overlying soil). The case analyses show the modified fitting formulae for the width coefficient of ground surface and subsurface trough agree with the measured data.
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    • References (36)
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