Preferential flow through cracks in weathered bedrock and slope stability

Daizo Tsutsumi; Masaharu Fujita; Roy C Sidle

doi:10.2208/prohe.49.1039

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Journal article

Preferential flow through cracks in weathered bedrock and slope stability

Daizo Tsutsumi, Masaharu Fujita and Roy C Sidle

Proceedings of Hydraulic Engineering, Vol.49, pp.1039-1044

2005

DOI: https://doi.org/10.2208/prohe.49.1039

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Abstract

Civil Engineering

cracks

weathered bedrock

slope stability

landslide

Richards' equation

preferential flow

Numerical experiments were conducted to assess the effect of preferential flow through pipes and cracks within weathered bedrock on slope stability, using hydrological model in which water flows within both the matrix and macropores. The hillslope consists of soil and weathered bedrock layers. Hydraulic properties were assigned to the weathered bedrock as well as the soil layer, and the regolith flow calculations were conducted within the slopes. Results demonstrated that the preferential flow pathway rapidly transported rainwater to the deeper layer of the slope, and if the outlets of the preferential flow pathway remained within the slope, the pressure head increased around these points. This increase in pressure head caused a decrease in the factor of safety at the deeper layer of the slope.

Details

Title: Preferential flow through cracks in weathered bedrock and slope stability
Authors: Daizo Tsutsumi (Author)
Masaharu Fujita (Author)
Roy C Sidle (Author)
Publication details: Proceedings of Hydraulic Engineering, Vol.49, pp.1039-1044
Publisher: Doboku Gakkai
Date published: 2005
DOI: 10.2208/prohe.49.1039
ISSN: 0916-7374
Organisation Unit: University of the Sunshine Coast, Queensland; Sustainability Research Cluster
Language: Japanese
Record Identifier: 99451253002621
Output Type: Journal article

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