›› 2012, Vol. 33 ›› Issue (2): 617-622.

• Numerical Analysis • Previous Articles     Next Articles

Saturated-unsaturated seepage analysis based on FLAC3D

LI Yi1, 2, WU Jia1, LI Kun1   

  1. 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering, Ministry of Education, Wuhan University, Wuhan 430072, China
  • Received:2010-07-06 Online:2012-02-10 Published:2012-02-14

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Abstract: When using FLAC3D which based on finite difference method (FDM) to calculate the seepage，the seepage surface is higher than the real situation’s and the permeability of unsaturated zone is a constant which is defined by mistakes. An adjusting element permeability method is used to develop the program secondly, and the modified adjusting element permeability method is proposed to correct the permeability of unsaturated zone strictly. After calculation, the exact continuous smooth seepage surface and saturated-unsaturated seepage are obtained. The FEM is used to analyze the seepage contrastively, and the feasibility and effectiveness of the method are validated. The method of attaching interface to downstream side is proposed to solve the problem in which the seepage points are hard to obtain on complicated three-dimensional boundary; then a three-dimensional complicated example is given to calculate the seepage field distribution of a slope; the result is accurate after verifications. The research results are helpful to guide the analysis of saturated-unsaturated seepage and the calculation related to seepage in the program.

Key words: saturated-unsaturated seepage, permeability, free surface, complicated boundary

CLC Number: 

  • O 357.3
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