Slope stability analysis in the Three Gorges Reservoir Area considering effect of antecedent rainfall

ABSTRACT Effects of different initial conditions of pore water pressure distribution on slope stability are investigated based on rainfall data in the Three Gorges Reservoir Area. A method to incorporate the initial condition of pore water pressure distribution into the slope stability analysis is suggested. Then, sandy and clayey slopes are taken as examples to investigate the effect of antecedent rainfall on slope stability. Results indicate that the influence of antecedent rainfall on the slope stability increases as the saturated permeability coefficient of the soil decreases.

[1]  D. Fredlund,et al.  Predicting the permeability function for unsaturated soils using the soil-water characteristic curve , 1994 .

[2]  E. Leong,et al.  REVIEW OF SOIL-WATER CHARACTERISTIC CURVE EQUATIONS , 1997 .

[3]  Pietro Aleotti,et al.  A warning system for rainfall-induced shallow failures , 2004 .

[4]  J. Wei,et al.  Landslide at Bukit Batok sports complex , 1991 .

[5]  David G. Toll,et al.  The effect of antecedent rainfall on slope stability , 2001 .

[6]  John. Pitts,et al.  An investigation of slope stability on the NTI campus, Singapore. , 1985 .

[7]  Yeou-Koung Tung,et al.  Three-dimensional numerical investigations of groundwater responses in an unsaturated slope subjected to various rainfall patterns , 2001 .

[8]  Tang Hui.  Stability and Control Measures of Zhaoshuling Landslide, Badong County, Three Gorges Reservoir , 2002 .

[9]  D. Fredlund,et al.  Equations for the soil-water characteristic curve , 1994 .

[10]  Chung Kwong Wong,et al.  The shear strength of unsaturated soils , 1984 .

[11]  Harianto Rahardjo,et al.  Effect of Antecedent Rainfall Patterns on Rainfall-Induced Slope Failure , 2011 .

[12]  The influence of spatial variability of soil permeability on the risk of rainfall induced landslides , 2015 .

[13]  M. Elfadil.  Effect of antecedent rainfall on pore-water pressure distribution characteristics in residual soil slopes under tropical rainfall , 2018, International Journal of Hydrology.

[14]  D. V. Griffiths,et al.  Simplified quantitative risk assessment of rainfall-induced landslides modelled by infinite slopes , 2014 .

[15]  J. Corominas,et al.  Reconstructing recent landslide activity in relation to rainfall in the Llobregat River basin, Eastern Pyrenees, Spain , 1999 .

[16]  Florence W. Y. Ko,et al.  Application of quantified risk analysis in landslide risk management practice: Hong Kong experience , 2009 .

[17]  Harianto Rahardjo,et al.  Factors Controlling Instability of Homogeneous Soil Slopes under Rainfall , 2007 .

[18]  M. Rossi,et al.  Rainfall thresholds for the initiation of landslides in central and southern Europe , 2007 .

[19]  Peter Lumb,et al.  Slope failures in Hong Kong , 1975, Quarterly Journal of Engineering Geology.