Effect of Antecedent Rainfall Patterns on Rainfall-Induced Slope Failure

Rainfall-induced slope failure occurs in many parts of the world, especially in the tropics. Many rainfall-induced slope failures have been attributed to antecedent rainfalls. Although it has been identified as a cause of rainfall-induced slope failure, the pattern or distribution of the antecedent rainfall has not received adequate attention. In this study, parametric studies were performed by using three typical rainfall patterns, identified by analysis of available rainfall data for Singapore and two different soil types to represent high- and low-conductivity residual soils of Singapore. Antecedent rainfall patterns were applied on soil slopes and a transient seepage analysis was conducted. The computed pore-water pressures were used in stability analyses to calculate the safety factor of the slope. Results indicated that antecedent rainfall affected the stability of both high-conductivity (HC) and low-conductivity (LC) soil slopes. However, the stability of the LC soil slope was more significantly af...

[1]  T. T. Lee,et al.  Response of a residual soil slope to rainfall , 2005 .

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

[3]  D. Fredlund,et al.  Soil Mechanics for Unsaturated Soils , 1993 .

[4]  B. Collins,et al.  STABILITY ANALYSES OF RAINFALL INDUCED LANDSLIDES , 2004 .

[5]  David G. Toll,et al.  CONTROLLING PARAMETERS FOR RAINFALL-INDUCED LANDSLIDES , 2002 .

[6]  Tung-Lin Tsai,et al.  Numerical modeling of rainstorm-induced shallow landslides in saturated and unsaturated soils , 2008 .

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

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

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

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

[11]  D. Fredlund,et al.  The shear strength of unsaturated soils , 1978 .

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

[13]  Cf Lee,et al.  CAUSATIVE MECHANISMS OF RAINFALL-INDUCED FILL SLOPE FAILURES , 2004 .

[14]  Charles Wang Wai Ng,et al.  Discussion of ‘Influence of rainfall intensity and duration on slope stability in unsaturated soils’ by C. W. W. Ng & Q. Shi (Quarterly Journal of Engineering Geology, 31, 105–114) , 1999, Quarterly Journal of Engineering Geology.

[15]  Keizo Ugai,et al.  NUMERICAL ANALYSIS OF RAINFALL EFFECTS ON SLOPE STABILITY , 2004 .

[16]  Michele Calvello,et al.  A numerical procedure for predicting rainfall‐induced movements of active landslides along pre‐existing slip surfaces , 2008 .

[17]  Harianto Rahardjo,et al.  SHEAR-STRENGTH CHARACTERISTICS OF A RESIDUAL SOIL , 1995 .

[18]  Andy Fourie,et al.  PREDICTING RAINFALL-INDUCED SLOPE INSTABILITY , 1996 .

[19]  Sang-Seom Jeong,et al.  Influence of rainfall-induced wetting on the stability of slopes in weathered soils , 2004 .

[20]  Harianto Rahardjo,et al.  Effect of antecedent rainfall on pore‐water pressure distribution characteristics in residual soil slopes under tropical rainfall , 2008 .

[21]  G. Crosta.  Failure and flow development of a complex slide: the 1993 Sesa landslide , 2001 .

[22]  Makoto Nishigaki,et al.  Laboratory rainfall-induced slope failure with moisture content measurement , 2007 .

[23]  P. Frattini,et al.  Approaches for defining thresholds and return periods for rainfall‐triggered shallow landslides , 2009 .

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

[25]  D. Fredlund,et al.  Soil Mechanics for Unsaturated Soils: Fredlund/Soil Mechanics for Unsaturated Soils , 1993 .

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

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

[28]  桑野 二郎,et al.  Rain-induced slope failures caused by reduction in soil strength. , 1991 .

[29]  S. Au.  Rain-induced slope instability in Hong Kong , 1998 .