颗粒级配对含蒙脱石砂土抗液化性能的影响

Experimental Research on Influence of Grain Size Gradation on Anti-Liquefaction Characteristics of Clayey Sand with Montmorillonite

通过对含蒙脱石粘粒砂土进行不同粗颗粒级配、不同粘粒含量重塑土样的室内动三轴试验、X光衍射试验和电镜扫描 ,对含粘粒砂土的抗液化性能进行了研究 .结果表明 :随着其粗颗粒由大变小 ,含粘粒砂土的抗液化能力逐渐降低 ;液化应力比与粘粒含量并非呈单调增加关系 ,而呈抛物线关系 ,并给出了回归方程 ;含粘粒砂土抗液化能力的最低点总是在粘粒含量 8.5 %～9.5

By the lab dynamic triaxial test, X ray diffraction and electron microscope scanning of clayey sand samples with montmorillonite and the same dry density but different grain size gradations and different clay contents, the anti liquefaction characteristic was investigated to determine its main influencing parameters. The results show that the smaller the size of clayey sand is, the weaker the anti liquefaction characteristics is; the relation curve of dynamic shear strength and content of clay is not linear, but approximately a curve of parabola; when the content of clay is between 8.5%～9.5%,the anti liquefaction characteristic of clayey sand is the worst.