Authors:Kavin kumar C,Heeralal M,Rakesh J Pillai,
Keywords:Rainfall induced landslide,water pressure,suction distribution,numerical assessments,slope failure,
AbstractRainfall is an extrinsic factor for the collapse of sloping terrain in Western Ghats of Kerala. Careful analysis of rainfall induced landslide is very important as people in the area have serious threat from landslides. In-depth assessments of variation of pore water pressure change in slopes during avalanche rainfalls are required for the purpose of mitigation. Soil water characteristic curve was prepared by field and laboratory tests so that various properties of unsaturated soil could be estimated. As suction distribution and rainfall infiltration were influenced by the ratio of rainfall intensity to saturated hydraulic conductivity, numerical models were analysed for various ratio of rainfall intensities. Variations of pore water pressure across different sections of the slope and reduction of factor of safety with respect to time and rainfall intensities were analysed. The results of the analyses can be applied in practice for determining the probability of landslide hazards in areas vulnerable to heavy rainfall and consequently damage from landslides.
I. Anderson MG, Lloyd DM. 1991. Using a combined slope hydrology-stability
model to develop cut slope design charts. Proc Inst Civ Eng. 2:705_718.
II. Chen L, Young MH (2006) Green-Ampt infiltration model for sloping
surface. Water Resour Res 42:1–9
J. Mech. Cont.& Math. Sci., Vol.-15, No.-1, January (2020) pp 328-338
Copyright reserved © J. Mech. Cont.& Math. Sci.
Kavin kumar C et al
III. De Campos, L.E.P. & Menezes, M.S.S. 1991. A proposed procedure for slope
stability analysis in tropical soils. In Proc., 6th Int. Symp. on Landslides,
Christchurch, New Zealand, Balkema, Rotterdam, The Netherlands, Vol. 2:
IV. Dhakal, A.S., and Sidle, R.C., (2004), ” Pore water pressure assessment in a
forest watershed: simulations and distributed field measurements related to
forest practices”, Water Resources Research. 40, W02405.
V. Fredlund, D.G., Xing, A. and Huang, S. (1994). Predict-ing the Permeability
Function for Unsaturated Soils Using the Soil-Water Character Curve.
Canadian Geo-technical Journal. 31(3): 533-546
VI. Green, W. H., and C. A. Ampt. 1911. “Studies on Soil Physics: Flow of Air
and Water through Soils.” Journal of Agricultural Science 4: 1–24.
VII. Griffiths, D. V., Huang, J., and de Wolfe, G. F. (2011). “Numerical and
analytical observations on long and infinite slopes.” Int. J. Numer. Anal.
Methods Geomech., 35(5), 569–585.
VIII. Muntohar, A. M., and H. J. Liao. 2010. “Rainfall Infiltration: Infinite Slope
Model for Landslides Triggering by Rainstorm.” Natural Hazards 54:967–
IX. Ng, C. W. W., and Shi, Q. (1998). “Influence of rainfall intensity and
duration on slope stability in unsaturated soils.” Q. J. Eng. Geol.
Hydrogeol.31 (2), 105–113.
X. Rahardjo H, Ong TH, Rezaur RB, Leong EC. 2007. Factors controlling
instability of homogeneous soil slopes under rainfall. J Geotech Geoenviron
Eng ASCE. 133:1532_1543
XI. Rahardjo H., Leong E. C., Deutsher M.S., Gasmo J.M. and Tang S.K. (2000)
Rainfall-Induced Slope Failures, Geotechnical Engineering Monograph 3,
NTU-PWD Geotechnical Research Centre, NTU, Singapore.
XII. Rahardjo, H. & Fredlund, D.G. 1995a. Procedures for slope stability analyses
involving unsaturated soils. In Developments in deep foundations and ground
improvement schemes, Balkema, Rotterdam, The Netherlands: 33-56.
XIII. Van Beek, L.P.H (2002), “Assessment of the influence of changes in Landuse
and Climate on Landslide Activity in a Mediterranean Environment” [PhD
thesis]: Utrecht, The Netherlands, University of Utrecht.
XIV. Van Genuchten, M Th. 1980. “A Closed-Form Equation Predicting the
Hydraulic Conductivity of Unsaturated Soils.” Soil Science Society of
America 44: 892–898.