Experimental Study on the Influenced Mechanical Parameters of Shear Strength of Unsaturated Clay Slope

摘要

Now, many achievements about theoretical and experimental research of unsaturated soil had made, however the shear strength model and mechanical parameters of unsaturated clay should be studied deeply. With the increase of moisture content, the mechanical parameters of shear strength can get smaller and smaller to fail due to rainfall infiltration into slope engineering. A basic model of the shear strength of clay slope is established according to unsaturated soil theory. Through the direct shear experiment and tensiometer, the shear strength and mechanical parameters and soil-water characteristic curve (SWCC) are obtained at different moisture content of clay slope. According to the experimental results, the functional relationships of the shear strength and mechanical parameters to moisture content are fitted with curve. And the variation of shear strength to matric suction of clay is also obtained. The results of experiment show that the shear strength and mechanical parameters and the SWCC all can be ascribe to the influence of moisture content of clay. The fitted SWCC of clay slope is more reasonable according to exponential function than power function.