陇东地区非饱和黄土的强度及变形特征研究

Study on unsaturated soil strength and deformation haracteristic of Long Dong district

以4种不同含水率的重塑土样为研究对象,分析了陇东地区非饱和黄土的强度及变形特征随压力及含水率变化的规律,分析结果表明,土壤剪切强度与含水率间呈负相关,而与垂直压力呈正相关;土壤内摩擦角和粘聚力随着含水率的增加而减小,粘聚力与含水率呈二次函数关系,而含水率与内摩擦角呈线性关系;含水率与压力均会影响黄土的变形,黄土压缩应变随土壤含水率的增大、垂直压力的增大而增大,垂直压力与黄土压缩应变间存在良好的幂函数关系。

According to four different water content remolded samples, the rule of unsaturated soil strength and deformation characteristic are studied. The conclusion shows that the significant negative correlation between shear strength and water content, and the significant positive correlation between shear strength and vertical pressure. The internal friction and cohesion reduces with the crease water content, and the change law accord with linear relationship; The compressive strain of the loess will crease with the creasing of soil water content. And relationship between the vertical pressure and compressive strain can be described by power function.