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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References
Fourie A B, Rowe D, Blight G E. The Effect of Infiltration on the Stability of the Slopes of a Dry Ash Dump [J].Geotechnique, 1999,49(1):1–13.
Kim J, Jeong S, Park S,et al. Influence of Rainfall-Induced Wetting on the Stability of Slopes in Weather Soils [J].Engineering Geology, 2004,75:251–262.
Ni Wanyong, Niu Fujun, Liu Dongyan. Analyzing Impact on Strength of Unsaturated Loess by Rainfall Infiltration [J].Geotechnical Investigation and Surveying, 2002, (3):15–18 (Ch).
Vanapalli S K, Fredlund K G, Pufahl D E,et al. Model for Prediction of Shear Strength with Respect to Matric Suction [J].Canadian Geotechnical Journal, 1996,33:379–392.
Li Ningjun, Xia Yongxu. Research of Effect of the Matrix Suction on the Mechanical Characteristics of Unsaturated Loess Tunnel [J].Journal of Xi' an Highway University, 2000,20(2):49–51 (Ch).
Green W H, Ampt G A. Studies on Soil Physics: The Flow of Air and Water through Soils [J].Journal of Agricultural Sciences, 1991,4(1):1–24.
Fredlund D G, Rahardjo H. Soil Mechanics for Unsaturated Soils [M], New York: Wiley, 1993.
Van Genuchten M T. A Closed-Form Equation for Predicting the Hydraulic Conductivity of Unsaturated Soils [J].Soil Science Society of America Journal, 1980,44:892–898.
Pradel D, Raad G. Effect of Permeability on Surficial Stability of Homogeneous Slopes [J].Journal of Geotechnical Engineering, 1993,119(2):315–332.
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Foundation item: Supported by the Knowledge Innovation Project of Chinese Academy of Sciences (KZCX2-306)
Biography: LI Xinpo(1978-), male, Ph. D. candidate, he works in the China University of Petroleum, research direction: slope stability and landslide analysis
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Xinpo, L., Chenghua, W. & Jun, X. Surficial stability analysis of unsaturated loess slopes subjected to rainfall infiltration effects. Wuhan Univ. J. Nat. Sci. 11, 825–828 (2006). https://doi.org/10.1007/BF02830171
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DOI: https://doi.org/10.1007/BF02830171