Acta Geotech 3:191–200īochev PB, Dohrmann CR, Gunzburger MD (2006) Stabilization of low-order mixed finite elements for the Stokes equations. Acta Geotech 4:177–191īirle E, Heyer D, Vogt N (2008) Influence of the initial water content and dry density on the soil-water retention curve and the shrinkage behavior of a compacted clay. Finite Elem Anal Design 43:361–383Īrifin YF, Schanz T (2009) Osmotic suction of highly plastic clays. Int J Numer Methods Eng 67:1531–1564Īndrade JE, Borja RI (2007) Modeling deformation banding in dense and loose fluid-saturated sands. Water Resour Res 33:2637–2653Īndrade JE, Borja RI (2006) Capturing strain localization in dense sands with random density. PhD Dissertation, University of California, BerkeleyĪnderson SP, Dietrich WE, Montgomery DR, Torres R, Conrad ME, Loague K (1997) Subsurface flowpaths in a steep, unchanneled catchment. Géotechnique 40:405–430Īnderson SP (1995) Flow paths, solute sources, weathering, and denudation rates: the chemical geomorphology of a small catchment. These results suggest that an infinite slope mechanism would be insufficient to represent the failure kinematics for a slope similar to CB1.Īlonso EE, Gens A, Josa A (1990) A constitutive model for partially saturated soils. Results of the studies suggest that for a steep hillside slope underlain by a shallow bedrock similar to the CB1 site, failure would occur by multiple slide blocks with the failure surfaces emerging on the slope face. We quantify the rainfall-induced slope deformation and assess the failure potential of the slope using finite element modeling that couples solid deformation with fluid pressure in an unsaturated soil. In this paper, we present a physics-based framework for continuum modeling of a hydrologically driven slope failure similar to what occurred in a steep experimental catchment CB1 near Coos Bay, Oregon. When excess fluid can no longer infiltrate the slope due to increased saturation in the soil, it is discharged as a surface runoff and erodes the slope. When the volume of infiltrating water is large enough to mobilize fluid flow inside the soil matrix, the fluid exerts a downhill frictional drag on the slope, creating a destabilizing effect. It increases the degree of saturation of the soil, thereby breaking the bonds created by surface tension between the soil particles. Rainfall weakens an earth slope in a number of ways.
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