细粒含量对饱和砂土液化特性的影响

通过对原状土样进行共振柱和动三轴试验，排除扰动样对原状土体结构性的破坏，研究不同细粒含量对饱和砂土动剪切模量和液化强度的影响。研究结果表明，在细粒含量小于30％时，由于细颗粒赋存于砂颗粒骨架形成的孔隙中，在砂颗粒之间起到类似于“滚珠”的作用，使得饱和砂土的抗液化强度随细颗粒的增加而降低。大于30％时，细颗粒逐渐占据砂颗粒形成的孔隙因而起着土体骨架的作用，并和砂颗粒一起承担由循环荷载引起的剪切变形，表现为抗液化强度随细粒含量的增加而升高。

Effect of fines content on liquefaction properties of saturated silty sands

Based on a series of resonant column and cyclic triaxial testing on undisturbed samples, the effect of fines content on liquefaction resistance and dynamic properties of silty sands was studied. It was found that the liquefaction resistance and dynamic properties of mixtures decreases with decreasing fines content up to a critical value of 30%, compared to that of pure sand. This trend is reversed when the content of fines is greater than 30%. The transition of behavior at this critical content is attributed to a change in the soil structure from one dominated by sand grains to one dominated by fines.