Analysis of Rainfall-Induced Debris Flows
Publication: Journal of Geotechnical Engineering
Volume 121, Issue 7
Abstract
Rainfall-induced debris flows are flow failures in residual and colluvial soils initiated by a reduction of confining stress as a result of pore-water pressure rise during or following periods of intense rainfall. To establish appropriate stability analysis procedures, the behavior of soil from a debris flow source area is investigated. Constant-shear-drained triaxial tests, tests that mimic the field stress path, and anisotropically consolidated undrained triaxial tests performed at the in-situ stress level indicate that undrained loading is a prerequisite for flow failure. Mechanisms of stress transfer are proposed to explain how the initially drained deformation that occurs along the field stress path can lead to undrained mobilization. Because a debris flow involves both drained initiation and undrained mobilization, a complete stability analysis includes an effective stress analysis with constant-shear-drained parameters to determine the potential for failure initiation, and an undrained strength analysis using undrained residual strength to determine the potential for debris flow mobilization.
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Published In
Journal of Geotechnical Engineering
Volume 121 • Issue 7 • July 1995
Pages: 544 - 552
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Copyright © 1995 American Society of Civil Engineers.
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Published online: Jul 1, 1995
Published in print: Jul 1995
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