Abstract
The loess slope stability is influenced by rainfall and other factors. In order to find out the mechanism of loess slope instability, especially the influence of rainfall intensity and slope, the indoor model test was performed to study rainfall-induced loess landslide in Tianshui area, Gansu Province. Slope gradient and rainfall intensity are considered as variables, and their influence on slope stability are analyzed based on monitoring of soil suction and water content, and slope deformation process. The results show that the higher the rainfall intensity, the faster the infiltration rate. The volumetric moisture rate under heavy rainfall is more than 10% under small rainfall intensity. The steeper the slope, the lower the infiltration rate for the slope model. The loess slope is prone to overall sliding from bottom to top under the heavy rainfall, and easily lead to down-top retrogressive landslide under light rain.
Highlights
In recent years, many geological disasters occurred in China
In Tianshui area of Gansu Province, there are many landslides occurred every year during the rainy season
The loess landslide which caused by rainfall is the mainly disaster in Tianshui area
Summary
Many geological disasters occurred in China. And over 70% of the geological disasters are landslides which mainly occurred in the rainy season[1]. In Tianshui area of Gansu Province, there are many landslides occurred every year during the rainy season. The loess landslide which caused by rainfall is the mainly disaster in Tianshui area. On the indoor simulation test of slope, Wu Caiping[3] et al took rainfall erosion on the slope surface of loess plateau as the prototype and designed an indoor experiment to study the influence of rainfall on the shape of barren loess slope. She found that the slope top infiltration rate is always higher than the slope surface. Preliminary explained the instability mechanism of rainfall secondary loess slope
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