›› 2010, Vol. 31 ›› Issue (5): 1497-1502.

• Geotechnical Engineering • Previous Articles     Next Articles

Stability analysis of shield tunnel face in multilayer soil with seepage

QIAO Jin-li, ZHANG Yi-tong, GAO Jian   

  1. School of Mechanical Engineering, Tianjin University, Tianjin 300072, China
  • Received:2008-10-29 Online:2010-05-10 Published:2010-05-24

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Abstract:

The traditional model of wedge for stability analysis of tunnel face under homogenous soil is extended to encompass multilayer soil with seepage; the wedge consists of trapezoids and each trapezoid is related to a layer of soil; the Terzaghi’s theory and upper limit theorem are applied to derive the equation for limit support pressure. The limit support pressure is the sum of the effective support pressure and seepage force; the former is obtained from limit equilibrium analysis and the latter is evaluated by means of numerical analysis of head distribution. It is found that the seepage force is the main portion of the limit support pressure. The analytical results are consistent with measured data in engineering.

Key words: excavation face stability, seepage, limit support pressure, upper theorem, multilayer soil

CLC Number: 

  • U 451
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