关键词: 土坡稳定性, 坡度, 含水率, 滑动位移, 粘聚强度, 数值模拟

Abstract:

The inner mechanism between the two influence factors of slope sliding was studied. The artificial rainfall experiments were carried out on three kinds of slopes with 30, 38 and 45 degree angles. Observations of the sliding displacement and water content of five fixed points along the slope surface, and UU triaxial test on soil samples were taken in the same location on the slope. The following rules were finally concluded within the slope and moisture content range of this study. The slope with larger gradient had comparatively longer vertical displacement, which was especially obvious in the upper and middle part of the slope. There was a liner relationship between the mud flow rate and the gradient. The larger the gradient was, the greater the rate of mud flow was. The total moisture level of fixed points related to the gradient. The greater the gradient was, the higher the water content was. The water content changed more greatly at the lower part of the slope. Under the same moisture condition, the soil cohesive strength increased with the gradient increasing. With the same gradient, the cohesive strength increased as the water content decreasing. Based on the above conclusions and numerical simulation test, the slopemudflow rate, the slope positionmoisture content and the moisture contentcohesive strength relations were proposed under the rainfall test condition.

Key words: slope stability, slope, moisture content, sliding displacement, sticky gather strength, numerical simulation