Initial static deviatoric stress can affect the liquefaction behaviour and deformation characteristics of saturated sand under cyclic loading. A series of cyclic triaxial tests were performed on a saturated sand consolidated under a constant vertical stress but different lateral stresses. The dependence of failure mechanism, liquefaction resistance, and stiffness evolution of the sand on initial static deviatoric stress ratio was investigated on medium dense to dense sand samples (D_r = 0.44 to 0.82). The pre-failure deformation and the direction of strain accumulation were analysed under different static deviatoric stress ratios. The results indicate that under cyclic loading with stress reversal condition, the effective mean stress in the samples could reduce to zero, which leads to cyclic mobility failure and completely loss of stiffness due to liquefaction. The stress state after cyclic loading could be above critical state line. Under non reversal loading condition, however, the effective mean stress cannot reduce to zero and therefore the samples fail under shear due to large strain accumulation. In this condition, the stress state at the end of the cyclic loading is approximately at the critical state line and hardly affected by initial deviatoric stress. The failure resistance of medium dense to dense sand is not greatly affected by initial static deviatoric stress until it is large enough to meet non-reverse loading condition. The ratio of axial stain to excess pore water pressure accumulation (or Δϵacc a/Δϵacc v) increases with the average static deviatoric stress ratio η^av. The strain accumulation direction roughly follows the flow rule of Modified Cam Clay model, independent of relative density and failure mechanism.

初始静偏应力会影响循环荷载作用下饱和砂土的液化行为和变形特性。在恒定的垂直应力和不同的侧向应力下固结的饱和砂土上进行了一系列循环三轴试验。研究了砂的破坏机制、抗液化和刚度演变对初始静态偏应力比的依赖性，对中密至密砂样品 (D _r = 0.44 到 0.82）。分析了不同静偏应力比下的破坏前变形和应变积累方向。结果表明，在具有应力反转条件的循环加载下，样品中的有效平均应力会降低到零，从而导致循环流动性失效和由于液化而完全丧失刚度。循环加载后的应力状态可能高于临界状态线。然而，在非反向加载条件下，有效平均应力不能降低到零，因此样品在剪切下由于大的应变积累而失效。在这种情况下，循环加载结束时的应力状态近似处于临界状态线，几乎不受初始偏应力的影响。中密至密砂的破坏抗力不受初始静偏应力的影响很大，直到它足够大以满足非反向加载条件。轴向污损与超孔隙水压力累积的比率（或Δϵacc a/Δϵacc v ) 随平均静态偏应力比η ^{av 增加}。应变积累方向大致遵循改良凸轮粘土模型的流动规律，与相对密度和破坏机制无关。