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J4  2012, Vol. 46 Issue (4): 665-671    DOI: 10.3785/j.issn.1008-973X.2012.04.014
Supporting pressure for earth pressure balance tunnel face stability
when  tunneling is implemented in saturated sandy soil
LIU Wei1, ZHANG Xiang-jie2, TANG Xiao-wu1, ZHU Ji3, CHEN Ren-peng1
1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China;
2. Civil Engineering Institute, Tokyo Institute of Technology, Tokyo 152-8552, Japan; 3. China Railway Siyuan Survey
and Design Group Limited Company, Wuhan 430000, China
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 Seepage application was considered in upper bound analysis to evaluate the seepage effect on face stability in order to avoid insufficient supporting pressure when earth pressure balance shield (EPB) is tunneling through aquifer sand stratum. Supporting pressure formula was proposed for EPB tunneling in saturated soil. Comparison and sensitivity analysis on coefficients of the supporting pressure equation indicated a slight effect of shield depth but obvious effect of shield diameter on face stability. Seepage factor takes larger portion in support pressure determination and becomes the most critical controlling factor with underground water level increasing. Stability equation deduced in the thesis gives out a straightforward criterion of support pressure determination. Case studies on the subway line show rational results from where important conclusions are obtained.

Published: 17 May 2012
CLC:  TU 434  
Cite this article:

LIU Wei, ZHANG Xiang-jie, TANG Xiao-wu, ZHU Ji, CHEN Ren-peng. Supporting pressure for earth pressure balance tunnel face stability
when  tunneling is implemented in saturated sandy soil. J4, 2012, 46(4): 665-671.

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