Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (S2): 345-354.doi: 10.16285/j.rsm.2021.1104

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Centrifugal model test on relationship between support pressure of shield tunnel face and ground deformation in water rich sand strata

LUO Wei-ping1, 2, YUAN Da-jun1, 2, JIN Da-long1, 2, LU Ping1, 2, CHEN Jian3, GUO Hai-peng1, 2   

  1. 1. Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China; 2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China, 3. China Railway 14th Bureau Group Co., Ltd., Jinan, Shandong 250014, China
  • Received:2021-07-20 Revised:2022-02-16 Online:2022-10-10 Published:2022-10-09
  • Supported by:
    This work was supported by the Key Project of High-speed Rail Joint Fund of National Natural Science Foundation of China(U1834208) and the Fundamental Research Funds for the Central Universities(2020YJS141).

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Abstract: In this study a centrifugal model test system was developed to explore the relationship between the face support pressure and ground deformation characteristics of shield tunnel in water rich sandy soil. Based on Wuhan Metro Line 8 large shield tunnel project, the influence of face support pressure on the face stability and ground deformation characteristics under different buried depths was investigated. The correlation curve between excavation face support pressure and surface deformation was obtained and the results show that: 1) When the cover of tunnel is shallow (<1.5D, where D is shield diameter), the influence of support pressure on surface deformation decreases with the increase of tunnel depth; when the tunnel is deep (>1.5D), no matter the support pressure is too small or too large, the influence of the excavation face support pressure on the ground deformation is difficult to extend to the surface. 2) When the support pressure is too high, the disturbance to the stratum takes on a “fishtail type”, which can be divided into compaction area, uplift area and settlement area induced by the jacking of excavation face as well as the settlement area. The settlement area is within 1D from the surface to the excavation surface, and the uplift area is within 1D−2D. 3) When the support pressure is too small, the main disturbance to the ground is settlement, and the influence range is about 1D in front of the excavation face. Additionally, the influence range will increase as the buried depth decreases. Based on centrifugal model test, the suggestion value of the range of support pressure premised on deformation control for different buried depths is obtained, which aims to provide guidance for the control of support pressure in practical engineering.

Key words: water rich sand strata, shield tunnel face, support pressure, ground deformation, centrifuge model test

CLC Number: 

  • U25
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