Journal of Shanghai Jiaotong University ›› 2018, Vol. 52 ›› Issue (8): 982-990.doi: 10.16183/j.cnki.jsjtu.2018.08.015

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Semi-Analytical Solution of Limit Support Pressure on Shield Tunnel Face Subjected to Water Level Fluctuation

YING Hongwei,SHEN Huawei,ZHANG Jinhong,ZHU Chengwei   

  1. 1. Research Center of Coastal and Urban Geotechnical Engineering, MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China; 2. Zhejiang Province Institute of Architectural Design and Research, Hangzhou 310008, China
  • Received:2017-10-24

Abstract: In order to study the influence of tides on shield tunnel excavation, by using the finite element software COMSOL, a three-dimensional numerical model is established to obtain the seepage field in front of the tunnel face. Phase delay and amplitude decay of seepage are found in the ground. The seepage force from the numerical results is applied to the “wedge-prism” limit equilibrium model, in order for the computation and analysis of the limit supporting pressure under the condition of water level fluctuation. Fluctuation of the limit supporting pressure is related to the ratio of the overburden thickness to the diameter of the tunnel, soil properties, boundary water level fluctuation, etc. With the increase of the ratio of the overburden thickness to the diameter of the tunnel and the decrease of the fluctuation period, the phase delay and amplitude decay of the limit supporting force are more notable. The seepage force on the tunnel face varies with time and the maximum value is smaller than that calculated in static water condition with the highest tidal level. The supporting force and tidal level reach the maximum value at different time.

Key words: water level fluctuation, shield tunnel face, limit support pressure, finite element method (FEM), semi-analytical solution

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