›› 2010, Vol. 31 ›› Issue (11): 3640-3644.

• Numerical Analysis • Previous Articles     Next Articles

Numerical simulation for unsaturated road-embankment deformation and slope stability under rainfall infiltration

WANG Xie-qun1，ZHANG You-xiang 2，ZOU Wei-lie 3, 4，XIONG Hai-fan1   

  1. 1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China; 2. Beijing Geotechnical Institute Engineering Consultang Limited, Beijing 100038, China; 3. School of Civil and Architectural Engineering, Wuhan University, Wuhan 430072, China; 4. Hubei Key Laboratory of Security of Geotechnical and Structural Engineering, Wuhan University, Wuhan 430072, China
  • Received:2009-08-12 Online:2010-11-10 Published:2010-11-24

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Abstract:

Owing to involving to unsaturated soil mechanics, numerical simulation for deformation of unsaturated road-embankment under rainfall infiltration is still a difficult point. The present strength reduction finite element methods usually only reduce strength parameters, which result in the deformation fields of road-embankments are different from the practical ones. This paper holds that under rainfall infiltration, not only the strength parameters of road-embankment soils will reduce, but also the deformation parameters will also change with the changing of soils stress levels and strength parameters. Using the developed FLAC program by authors, the numerical simulation for a high road-embankment deformation under different rainfall infiltration depths are conducted; and the results of numerical calculation are compared with those of the laboratory model tests. Then the influence law of rainfall infiltration depths on the road-embankment slope stability and sliding arc changing characteristics are analyzed by strength reduction finite element methods and limit equilibrium method (Bishop method).

Key words: unsaturated road-embankment, rainfall infiltration, deformation, slope stability, numerical simulation

CLC Number: 

  • U 416.1
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