›› 2009, Vol. 30 ›› Issue (4): 1083-1088.

• Numerical Analysis • Previous Articles     Next Articles

Numerical modeling of sand liquefaction behavior under cyclic loading

ZHOU Jian 1, 2，YANG Yong-xiang 1, 2，LIU Yang3，JIA Min-cai 1, 2   

  1. 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Department of Civil Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2007-09-10 Online:2009-04-10 Published:2011-01-30

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Abstract:

Based on the constant volume cyclic biaxial test in particle flow code (PFC), PFC2D, the behavior of sand liquefaction under cyclic loading is simulated by PFC2D . The major advantage of PFC2D is the evolution regularity of microscopic fabric parameters including co-ordination number, contact normal, normal contact force, shear contact force, can be achieved together with the macroscopic liquefaction response. The micromechanism of sand liquefaction is further discussed. The results of numerical simulation indicate that the sand liquefaction is reflected by the accumulation of excess pore water pressure and progressive decrease in mean effective principal stress in macroscopic response; and on the other hand, corresponds to the cumulative loss of co-ordination number and continuous reduction of contact forces in microscopic fabric. The micromechanical research exposes that the loss of co-ordination is related to the lagging of fabric anisotropy behind stress anisotropy.

Key words: cyclic loading, sand liquefaction, discrete element modeling, constant volume cyclic biaxial test, fabric parameters

CLC Number: 

  • TU 443
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