Study on the Infiltration Rule of Expansive Rock Canal Slope: Fid-Bau Portal

Study on the Infiltration Rule of Expansive Rock Canal Slope

Zhao, Er Ping / Jia, Xiao Bing / Liu, Qiu Fei / Yan, Xuan

In order to find out the infiltration rule of expansive rock canal slope, take the expansive rock in south-to-north water diversion project as sample. First, soil-water characteristic curve of expansive rock test was carried out. It predicts the unsaturated infiltration coefficient. Then, based on the test result and the saturated-unsaturated seepage theory, the varying law of seepage field under different rainfall intensity was studied. The results show that when the rainfall intensity is less than the slope material saturated permeability coefficient, with the increase of slope rainfall duration, the underground water level rises gradually, but the increase is very small. Meanwhile, there isn't saturation zone on the surface of the slope. When the rainfall intensity is greater than or equal to the slope material saturated permeability coefficient, after one day's continuous rainfall, saturation zone appears in the slope surface. After 5 days' continuous rainfall, saturation zone appears in the middle of the slope (elevation: 89m). After 12 days' continuous rainfall, the underground water level arrives at the slope toe. So, in order to prevent slope sliding under the rainfall infiltration condition, both the slope toe and the middle of the slope should all be given enough attention, and it is not only necessary but also essential to take drainage measures in the relevant position in advance.