冻融循环条件下粉质粘土物理力学性质研究

摘要

Taking silty clay in Tibetan plateau as the research target,the paper carries out more than 30 times of freezing-thawing cycling test for the soil sample,carries out fast shearing test for various cycled soil samples,studies physical and mechanical properties of silty clay with various moisture content and dry density and strength changing law with freezing-thawing cycling. Experimental results show that:the dry density of soil sample increases with moisture content and dry density increasing,soil cohesion increases with moisture content reducing and dry density increas-ing,internal friction angle has no obvious law.%以青藏高原的粉质粘土为研究对象，对土样进行了最多30次的冻融循环，并对不同循环后的土样进行了快速剪切试验，研究了不同含水率、不同干密度的粉质粘土的物理特性以及强度特性随冻融循环的变化规律，试验结果表明：冻融循环过程中，土样的干密度变化率随着含水率以及干密度的增加而增加，土的粘聚力随着含水率的减小和干密度的增加而增加，内摩擦角则无明显的规律。