科研之友
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摘要
The main objective of this paper is to investigate the effect of initial fabric on liquefaction potential of granular materials by discrete element simulations. Three cases of initial arrangement of particles were considered: (1) the particles created with a random distribution of the major axis orientation, namely R samples;(2) the particles created with their major axes parallel to the horizontal direction, namely H samples;and (3) the particles created with their major axes parallel to the vertical direction, namely V samples. The strain-controlled undrained (constant volume) cyclic biaxial shear tests were carried out to explore the liquefaction behavior of numerical samples with different initial particle orientations. It was found that the samples with regular distributions of major axis orientation have a higher liquefaction resistance than those with random distributions, and the micro mechanism of this phenomenon is related to the initial averaged co-ordination numbers of different samples. Numerical samples significantly exhibit stress-induced fabric anisotropy during liquefaction regardless of their initial particle arrangements.
