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滑带土的强度特性直接关系到滑坡体的稳定性,在影响滑带土强度特性的众多因素中,水的作用至关重要,且水对不同种类滑带土强度特性的影响程度不同。粉土和粉质黏土属于两种常见的滑带土类型,笔者选取三峡的粉土滑带土和栾川的粉质黏土滑带土,进行了不同含水率下的室内直接剪切试验,旨在对比研究此两种滑带土的水致弱化规律。试验结果表明:在含水率增大的过程中,三峡粉土滑带土的黏聚力先增大后减小,在液限附近存在一个极大值,栾川粉质黏土滑带土的黏聚力则呈对数形式递减;随着含水率的增大,三峡粉土滑带土和栾川粉质黏土滑带土的内摩擦角均呈线性降低,三峡粉土滑带土内摩擦角降低的速率小于栾川粉质黏土滑带土。
The strength characteristics of landslide soil are directly related to the stability of the landslide body. Among the many factors affecting the strength characteristics of landslide soil, water plays an important role and the influence of water on the strength characteristics of different types of landslide soil is different. Silt and silty clay belong to two common types of slippery soil. The authors selected the silt and clay of the Three Gorges and the silty clay of Luanchuan, conducted direct indoor shear tests under different water contents, In the comparison of the water-induced weakened law of these two slip-zone soil. The experimental results show that in the process of water content increasing, the cohesion of soil in the slippery soil of the Three Gorges first increases and then decreases, and there exists a maximum near the liquid limit. Cohesion decreases logarithmically; with the increase of water cut, the internal friction angles of the Three Gorges silt slide soil and Luanchuan silty clay slide zone decrease linearly. The internal friction angle The rate of decrease is less than that of Luanchuan silty clay.