Simulation of subsurface flows associated with rainfall-induced shallow slope failures

Ching-Chuan Huang, Chien Li Lo

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Modeling transient subsurface flow along the soil-bedrock interface and the subsequent mounding of porewater pressure head in the slope toe zone is key to a successful prediction of rainfall-induced shallow slope failure and debris flow initiation. To this end, finite element analyses are performed on some model slopes subjected to artificial rainfall using calibrated soil-water characteristic curves (SWCCs) and soil permeability functions (SPFs). Analytical results highlighted the importance of lateral subsurface flow in modeling rainfall-induced shallow slope failure, which cannot be adequately simulated using one-dimensional seepage models. Analytical results also revealed that the formation of a saturated zone and an outward subsurface flow over the entire length of the soil-bedrock interface signals rapid slope mass wasting. Results of a comparative study showed that an accurate modeling of time-dependent subsurface water table development requires modifications to the analytical boundary conditions induced by the wash-away of the slope toe. An accurate physical model of shallow slope failures requires further works to address this issue.

Original languageEnglish
Pages (from-to)101-111
Number of pages11
JournalJournal of GeoEngineering
Volume8
Issue number3
DOIs
Publication statusPublished - 2013 Jan 1

Fingerprint

slope failure
subsurface flow
Rain
Soils
rainfall
simulation
bedrock
modeling
mass wasting
soil
transient flow
phreatic zone
Seepage
Debris
debris flow
seepage
water table
Water
comparative study
porewater

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology

Cite this

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abstract = "Modeling transient subsurface flow along the soil-bedrock interface and the subsequent mounding of porewater pressure head in the slope toe zone is key to a successful prediction of rainfall-induced shallow slope failure and debris flow initiation. To this end, finite element analyses are performed on some model slopes subjected to artificial rainfall using calibrated soil-water characteristic curves (SWCCs) and soil permeability functions (SPFs). Analytical results highlighted the importance of lateral subsurface flow in modeling rainfall-induced shallow slope failure, which cannot be adequately simulated using one-dimensional seepage models. Analytical results also revealed that the formation of a saturated zone and an outward subsurface flow over the entire length of the soil-bedrock interface signals rapid slope mass wasting. Results of a comparative study showed that an accurate modeling of time-dependent subsurface water table development requires modifications to the analytical boundary conditions induced by the wash-away of the slope toe. An accurate physical model of shallow slope failures requires further works to address this issue.",
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Simulation of subsurface flows associated with rainfall-induced shallow slope failures. / Huang, Ching-Chuan; Lo, Chien Li.

In: Journal of GeoEngineering, Vol. 8, No. 3, 01.01.2013, p. 101-111.

Research output: Contribution to journalArticle

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AU - Huang, Ching-Chuan

AU - Lo, Chien Li

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