黏粒和砂粒混合土体的动态液化性能研究

Dynamic Liquefaction Properties of Sand-Clay Mixture

现场和实验室观测表明,一定黏粒含量的砂土在一定条件下易发生动力液化的现象,且黏粒含量对砂土抗液化性能的影响较为复杂。通过CKC全数字闭环控制气动式三轴仪试验系统,对黏粒含量为0%、5%和10%的砂土进行动力三轴试验。结果表明,黏粒含量为5%时砂土的抗液化性能最差,并且黏粒含量对于孔压的发展具有较大影响。根据实验数据的分析,对砂土-黏土的混合土的液化和抗液化性能进行机理分析。

Field observations and laboratory studies indicate that sand with a certain amount clay can be easily dynamically liquefied under certain conditions and that the amount of clay has a complex impact on the liquefaction resistance of sand.Using a CKC dynamic tri-axial test system,the liquefaction resistance of sand samples with different clay content （0 %, 5 %, and 10%） was investigated.The results show that the sand sample with 5 % clay had the lowest liquefaction resistance;the generation of pore water pressure is obviously effected by the clay content.The liquefaction mechanism of the sand-clay mixture is explained according to the experimental results.