Rainfall infiltration: infinite slope model for landslides triggering by rainstorm

Shallow slope failure due to heavy rainfall during rainstorm and typhoon is common in mountain areas. Among the models used for analyzing the slope stability, the rainwater infiltration model integrated with slope stability model can be an effective way to evaluate the stability of slopes during rainstorm. This paper will propose an integrated Green–Ampt infiltration model and infinite slope stability model for the analysis of shallow type slope failure. To verify the suitability of the proposed model, seven landslide cases occurred in Italy and Hong Kong are adopted in this paper. The results indicate that the proposed model can be used to distinguish failed and not-yet failed slopes. In addition, the proposed model can be used as the first approximation for estimating the occurrence time of a rainfall-induced shallow landslide and its depth of sliding.

[1]  Richard M. Iverson,et al.  Landslide triggering by rain infiltration , 2000 .

[2]  V. Tofani,et al.  Infiltration, seepage and slope instability mechanisms during the 20–21 November 2000 rainstorm in Tuscany, central Italy , 2006 .

[3]  L. A. Richards.  Capillary conduction of liquids through porous mediums , 1931 .

[4]  Dawei Han,et al.  Automated Thiessen polygon generation , 2006 .

[5]  Agus Setyo Muntohar,et al.  Analysis of rainfall-induced infinite slope failure during typhoon using a hydrological–geotechnical model , 2009 .

[6]  Charles Wang Wai Ng,et al.  Analytical Analysis of Rainfall Infiltration Mechanism in Unsaturated Soils , 2004 .

[7]  Veronica Tofani,et al.  Analysis of the landslide triggering mechanism during the storm of 20th–21st November 2000, in Northern Tuscany , 2006 .

[8]  Hengxing Lan,et al.  Rainfall-induced landslide stability analysis in response to transient pore pressure - A case study of natural terrain landslide in Hong Kong , 2004 .

[9]  Kyoji Sassa,et al.  Quantitative assessment on the influence of heavy rainfall on the crystalline schist landslide by monitoring system -case study on Zentoku landslide, Japan , 2005 .

[10]  J. M. Duncan.  State of the Art: Limit Equilibrium and Finite-Element Analysis of Slopes , 1996 .

[11]  M. Xie,et al.  A time-space based approach for mapping rainfall-induced shallow landslide hazard , 2004 .

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

[13]  Kenneth Gavin,et al.  A simple method to analyze infiltration into unsaturated soil slopes , 2008 .

[14]  Michael H. Young,et al.  Green‐Ampt infiltration model for sloping surfaces , 2006 .

[15]  H. Rahardjo.  Studies of rainfall-induced slope failures , 2002 .

[16]  Xiaodong Wang,et al.  Infiltration and saturated hydraulic conductivity of compacted clay , 1995 .

[17]  W. Z. Savage,et al.  TRIGRS - A Fortran Program for Transient Rainfall Infiltration and Grid-Based Regional Slope-Stability Analysis, Version 2.0 , 2002 .

[18]  R. Fukagawa,et al.  Study of Slope Failure due to Rainfall: A Comparison Between Experiment and Simulation , 2006 .

[19]  Robert V. Whitman,et al.  Organizing and evaluating uncertainty in geotechnical engineering , 2000 .

[20]  J. Philip,et al.  Hillslope infiltration: Planar slopes , 1991 .

[21]  Chen Chien-Yuan,et al.  Analysis of time-varying rainfall infiltration induced landslide , 2005 .

[22]  Giovanni B. Crosta,et al.  Regionalization of rainfall thresholds: an aid to landslide hazard evaluation , 1998 .

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

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

[25]  R. Govindaraju,et al.  Infiltration and deep flow over sloping surfaces: Comparison of numerical and experimental results , 2009 .

[26]  Sudhakar M. Rao.  Role of apparent cohesion in the stability of Dominician allophane soil slopes , 1996 .

[27]  Seung-Rae Lee,et al.  Evaluation of Surficial Stability for Homogeneous Slopes Considering Rainfall Characteristics , 2002 .