含细粒饱和砂土的液化特性研究综述

Review of liquefaction properties of saturated sands containing fines

综述了国内外有关含粉粒饱和砂土和含黏粒饱和砂土液化特性的试验研究成果,对于含粉粒饱和砂土,粉粒质量分数、粉粒粒径和砂骨架颗粒级配对饱和砂土的液化特性影响显著,粉粒的存在或可以增加或降低含粉粒饱和砂土的动强度,或存在临界粉粒质量分数使饱和砂土的动强度随粉粒质量分数的增加呈非单调性变化;对于含黏粒饱和砂土,临界黏粒质量分数使饱和砂土的抗液化强度随粉粒质量分数的增大先减小再增大;黏粒的塑性指数对饱和砂土的抗液化强度有较大影响;不同颗粒组成的饱和砂土对塑性指数的反应不尽相同。

In this review, we present the main researches on liquefaction characteristics of saturated sand containing silt or clay. The research results show that silt content, silt particle size and sand grain composition have a great impact on liquefaction characteristics of saturated sand containing silt. The liquefaction resistance of saturated sand containing silt may increase or decrease as silt content increases. In some cases, there might exist a limit silt content such that the dynamic strength of sand containing silt changes non-monotonously as the silt content increases. For sand-clay mixtures, the liquefaction resistance initially decreases as the clay content increases and then turn to increase as the clay content continues to increase. Liquefaction characteristics of clay sand greatly relate to plasticity index （ PI） of clay particles. Sand in different grain composition situations may have different reactions to PI values of clay particles.