Investigating rainfall-induced unsaturated soil slope instability: A meshfree numerical approach

Dakssa, L.M. and Harahap, I.S.H. (2012) Investigating rainfall-induced unsaturated soil slope instability: A meshfree numerical approach. In: UNSPECIFIED.

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Abstract

It is a common phenomenon, especially, in tropical and subtropical regions that a standing soil slope fails during or immediately after heavy or prolonged rainfall events. A possible reason is that rainwater infiltration affects the pore-water pressure distribution in soil slope. While negative pore-water pressures add to the stability of soil slopes, positive pore-water pressures disrupt the existing stability. The changes in pore-water pressure in the soil are handled through infiltration/seepage analyses. Conventionally, numerical approach to seepage analysis is carried out by the mesh-based finite element software SEEP/W. More recent studies, however, indicate SEEP/W software yields appalling numerical oscillations near the wetting fronts as seepage progresses through unsaturated soils. In view of seeking an alternative approach, in this paper, a meshfree smoothed particle hydrodynamics (SPH) method was used to simulate infiltration into and seepage through unsaturated soil slope. The governing flow equation was developed by incorporating seepage force into the Navier-Stokes equation. Numerical examples were executed to test the capability of the SPH scheme in mimicking both infiltration and seepage. It was confirmed that the SPH method is versatile in that new physics of flow can be incorporated during program coding with ease. Besides, the simulation results indicate that SPH numerical approach can be considered as a better seepage analysis method as, unlike the mesh-based finite element, it does not suffer from mesh distortions when used for simulating large deformations - the case in landslides. © 2012 WIT Press.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Additional Information: cited By 2; Conference of 4th International Conference on Monitoring, Simulation Prevention and Remediation of Dense and Debris Flows, DEB12 ; Conference Date: 29 May 2012 Through 31 May 2012; Conference Code:91473
Uncontrolled Keywords: Alternative approach; Finite Element; Finite element software; Flow equations; Large deformations; Matric suctions; Mesh distortion; Meshfree; New physics; Numerical approaches; Numerical example; Numerical oscillation; Pore-water pressures; Rainfall event; Seepage analysis; Smoothed particle hydrodynamics methods; Soil slopes; SPH; SPH methods; Subtropical regions; Unsaturated soil; Unsaturated soil slopes; Wetting fronts, Computer software; Continuum mechanics; Debris; Deformation; Finite element method; Hydraulic conductivity; Infiltration; Navier Stokes equations; Numerical methods; Rain; Seepage; Soils, Hydrodynamics
Depositing User: Mr Ahmad Suhairi UTP
Date Deposited: 09 Nov 2023 15:51
Last Modified: 09 Nov 2023 15:51
URI: https://khub.utp.edu.my/scholars/id/eprint/2917

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