| Surficial Stability Analysis of Unsaturated Loess Slopes Subjected to Rainfall Infiltration Effects |
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| 作者姓名： | LI Xinpo WANG Chenghua XU Jun |
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| 作者单位： | [1]Institute of Mountain Hazards and Environment,Chinese Academy of Sciences, Chengdu 610041, Sichuan,China [2]Graduate University of Chinese Academy of Sciences,Beijing 100049, China [3]College of Architecture and Storage Engineering,China University of Petroleum, Dongying 257061, Shandong,China |
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| 基金项目： | 中国科学院知识创新工程项目 |
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| 摘 要： | 0IntroductionInstability of unsaturatedsoil slopes subjectedtorainfall in-filtrationis commonin manycountries.Intheloess area ofChina,these failures are particularly serious due tothe specialstructure of loess.These surficial failures are characterized byrelatively shallowfailure surfaces and the surfaces are usuallyparallel to the slope surface.Generally,raininduces a rise ofthe groundwater table and anincrease in pore water pressurethat resultsinslopefailure.However,as the groundwater ta-bl…
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| 关 键 词： | 边坡稳定性 不饱和土 渗透 基质吸力 降雨 |
| 文章编号： | 1007-1202（2006）04-0825-04 |
| 收稿时间： | 2005-12-11 |
Surficial stability analysis of unsaturated loess slopes subjected to rainfall infiltration effects |
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| LI Xinpo WANG Chenghua XU Jun.Surficial Stability Analysis of Unsaturated Loess Slopes Subjected to Rainfall Infiltration Effects[J].Wuhan University Journal of Natural Sciences,2006,11(4):825-828. |
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| Authors: | Li Xinpo Wang Chenghua Xu Jun |
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| Institution: | (1) Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, 610041 Chengdu, Sichuan, China;(2) Graduate University of Chinese Academy of Sciences, 100049 Beijing, China;(3) College of Architecture and Storage Engineering, China University of Petroleum, 257061 Dongying, Shandong, China |
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| Abstract: | According to theory of unsaturated soil strength and Green-Ampt model, an analysis method based on limit equilibrium theory is introduced to consider rainfall infiltration effects in loess slope stability analysis. The relationships between wetting band depth and surficial stability of slopes are analyzed. It is found that the infiltration adds to the weight of the soil and at the same time reduces the shear strength provided by matric suction of the soil. The wetting band depth plays a key role in the stability of slopes. The minimum rainfall intensity and the minimum rainfall duration needed to infiltrate to the wetting front depth are calculated based on the Green-Ampt model. The method in this paper will contribute to the predication of slope stability considering rainfall characteristics. |
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| Keywords: | slope stability unsaturated soils infiltration matric suction |
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