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| RAINFALL THRESHOLD MODEL OF RAINFALL-INDUCED SLOPE INSTABILITY AND ITS APPLICATION |
| HE Yuqiong1，XU Zemin2，ZHANG Yong3，WANG Zhiqi3 |
HE Yuqiong1，XU Zemin2，ZHANG Yong3，WANG Zhiqi3
(1. Faculty of Transportation Engineering，Kunming University of Science and Technology，Kunming，Yunnan 650500，China；
2. Faculty of Architectural Engineering，Kunming University of Science and Technology，Kunming，Yunnan 650500，China；
3. Yunnan Institute of Highway Science and Technology，Kunming，Yunnan 650051，China) |
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Abstract In order to realize visual analysis and prediction of slope stability，a worksite slope in Shuangbai，Chuxiong is investigated. Based on digital elevation model(DEM)，combining the factors such as rainfall，topography and geomorphology，and soil characteristics，the threshold rainfall for deformation and instability of the slope unit is calculated by the rainfall threshold model. And the effects of rainfall infiltration and gradient on slope stability are analyzed. Comparing the results between the model prediction and the actual monitoring of slope stability，it is shown that the rainfall threshold model can simulate well the needful rainfall which can induce the instability of slope in each unit. The unit of slope may be instable when the rainfall is larger than the rainfall threshold of slope. The simulation result fits the real slope instability cases very well.
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2012, Vol. 31 
