Abstract
Taking a homogeneous double-layer soil slope as an example, the SEEP/W module and SLOPE/W module in the finite element analysis software GeoStudio were used in this paper. Then, the changes of pore water pressure and stability under different rainfall patterns and soil parameters were studied. Finally, the variation curves of pore water pressure and slope safety factor with rainfall time were obtained. The results show that: Soil parameters a and m are directly proportional to the slope safety factor, while n is inversely proportional to the slope safety factor. Under the condition of continuous rainfall, the decreasing rate of slope safety factor is directly proportional to the rainfall intensity.Under different rainfall patterns, the continuous rainfall in the advanced and normal rainfall patterns will cause the slope stability to decline and then gradually recover, while delayed and averaged rainfall patterns rainfall will cause the slope stability to decline continuously.In addition, there is a lag period in the change of slope safety factor, and the whole lag period lasts about 6 hours. During the lag period, the pore water pressure inside the soil began to decrease, while the slope safety factor continued to decrease. The safety factor starts to recover after the lag period ends.
Highlights
Slope instability is a common geological disaster in open pit mining
Where: is the shear strength of unsaturated soil; c ' is the effective cohesion of unsaturated soil; ' is the effective internal friction angle of unsaturated soil; n ua is the static normal stress; n is the total normal stress; ua is pore gas pressure; ua uw is matrix suction; uw is pore water pressure; b is the friction angle corresponding to the contribution of matrix suction to shear strength. b usually decreases with the increase of matrix suction, which is assumed to be constant in this study
When the soil parameters a =100, m =1 and n =2, the relationship between the pore water pressure and the safety factor in the slope is analyzed under the four rainfall patterns.Fig.8 shows Pore water pressure variation curve of slope section X-X at different elevations
Summary
Slope instability is a common geological disaster in open pit mining. A large number of examples of slope instability indicate that rainfall is one of the main factors inducing landslides and debris flows ([1,2]). Many researches have been carried out on the instability of soil slope induced by rainfall These studies mainly focus on the influence of soil parameters, initial groundwater level, rainfall intensity and rainfall pattern, slope geometry and other factors ([1,2,3,4,5,6]). The fluid-solid coupling model was used to analyze the influence of different soil parameters and rainfall types on slope stability changes. This provides a theoretical reference for the instability of double slope induced by rainfall
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