中文摘要：

以湘潭北站附近某边坡的坡积土为研究对象,开展3种不同干密度下9组不同饱和度的抗剪强度试验。研究结果表明：干密度越大,非饱和土的抗剪强度越高,且随着饱和度从饱和状态到残余状态呈现增、减和稳定3个阶段;黏聚力也随着饱和度的减小呈现增、减和稳定3个阶段,变化规律近似呈正态分布,内摩擦角随饱和度增大呈非线性减小;黏聚力随干密度的增大而增大,干密度对内摩擦角影响较小;建立了含有饱和度的非饱和土总应力抗剪强度实用公式。

英文摘要：

Taking the colluvial soil at certain slope near Xiangtan North Station as the study object, shear strength tests in nine sets of saturation degree and three sets of dry density were carried out. The result shows that, the larger the dry density, the higher the shear strength of unsaturated soil, and as the saturation changes from saturated to residual condition, there presents increasing, decreasing and stable stages; the cohesion also presents increasing, decreasing and stable stages as the saturation degree reduces, in respect of which the change law is somewhat similar to normal distribution; the internal friction angle presents nonlinear decrease as the saturation degree increases; the cohesion increases with the dry density which has less effect on the internal friction angle. Finally, an useful formula of total stress shear strength of unsaturated soil, which contains saturation degree, is established.