Slope Stability Sensitive Analysis For Fangzhi Excavating Channel Of South-to-North Water Diversion Project

The stability of landslip is recognized as a difficult problem in the engineering. It is one of the crucial factors that decide the project in the hydraulic project, traffic engineering, mineral engineering and building-construction projects. The South-to-North Water Diversion Project covers more than seven hundreds kilometres in Henan province, the influence of the factors to the slope stability is difficult to analyze as the geologic structure is changeable from place to place. Taking Fangzhi excavating channel of South-to-North Water Diversion Project as the object of study, this paper used the single parameter method and the multi-parameter method to analyze the sensitive factors of soil internal friction angle, soil cohesion, the angle of slip, the groundwater surface and the volume weight by Bishop calculation method. The chief contents of this paper are as follows:1. Using Bishop slices method, analyzed the sensitive factors of soil internal friction angle, soil cohesion, the angle of slip, the groundwater surface and the volume weight, studied its trends with the change of single parameter.2. Combination of the single parameter method and the multi-parameter method, supported by Grey correlation analysis, are used in study of the sensitive factors of soil internal friction angle, soil cohesion, the angle of slip, the groundwater surface and the volume weight. The calculation results show that soil internal friction angle is the most sensitive factor and the most insensitive factor is groundwater surface.3. Two modes are especially studied, mode one is that the channel empty and the groundwater keeps steady seepage; the other mode is the first mode adding earthquake. Results show that the safety factor variation tendency is similar in the two modes. The safety factor in the second mode is 0.11～0.25 smaller than the first mode.