Confining stress is a major consideration in the assessment of liquefaction resistance of granular soils. In this study, the influence of confining stress to cyclic liquefaction from micromechanical perspectives are explored using DEM simulations. Eight samples with different confining stresses and void ratios are prepared and subjected to undrained cyclic loading tests to reach initial liquefaction. It is observed that the influence of confining stress to coordination number of the sample before shearing is limited. However, confining stress has a significant influence to probability distribution of normal contact forces. Sample with higher confining stress has higher fraction of medium normal forces. During liquefaction process, evolution of coordination number versus effective vertical stress for all samples converge to a unique curve, which may depict the minimum value of coordination number for the load-bearing structure to sustain the effective stress. Different anisotropic sources undertake different roles in shear resistance. The contribution of tangential contact force anisotropy to shear resistance is gradually replaced by contact normal anisotropy.

在评估粒状土壤的抗液化性时，主要考虑应力是围压。在这项研究中，使用DEM模拟从微观力学角度探讨了应力对循环液化的影响。制备了八个具有不同围压和空隙率的样品，并进行了不排水的循环载荷试验，以达到初始液化的目的。可以看出，限制应力对剪切前样品的配位数的影响是有限的。但是，限制应力对法向接触力的概率分布有很大的影响。围压较高的样品具有较高的中等法向力分数。在液化过程中，所有样品的配位数与有效垂直应力的关系会收敛到一条唯一的曲线，它可以描述承重结构承受有效应力的协调数的最小值。不同的各向异性源在抗剪强度中起着不同的作用。切向接触力各向异性对剪切阻力的贡献逐渐被接触法向各向异性所代替。