饱和松散粉土剪切波速对其抗液化强度影响的研究

Research on Relativity between the Shear Wave Velocity and the Liquefaction Resistance of Loose Saturated Sand

采用剪切波速与振动三轴联合试验装置,分析了原状和重塑饱和松散粉土的抗液化强度与剪切波速之间的相关性。结果表明,当采用的液化判别标准超过7%时,不论原状还是重塑粉土,只要在相同围压下具有相同的剪切波速,其抗液化强度仍具有较强的相关性,并且实验样本的相关系数均在0.82以上。这为用剪切波速评价松散粉土的抗液化强度奠定了基础。

The relativity between the shear wave velocity and the liquefaction resistance of undisturbed and remolded loose saturated silt is analyzed by a kind of combined test apparatus on which shear wave velocity and dynamic triaxial test of soil specimen. The results show that the liquefaction resistance correlates very well with the shear wave velocity under the condition that the liquefaction criteria we adopted is more than 7 %. That means no matter undisturbed or remolded loose saturated loess sample, they have the unique liquefaction resistance if their shear wave velocity is equality under the same consolidation pressure. According to the test resuits, all the sets of soil samples have the correlation coefficient larger than 0.82. This conclusion is very useful in the liquefaction resistance evaluation of loose saturated loess by shear wave velocity.