Coarse-Grained Debris-Flows: Hysteresis and Time-Dependent Rheology
Publication: Journal of Hydraulic Engineering
Volume 126, Issue 12
Abstract
Rheometer tests of coarse-grained debris-flow material show hysteresis of yield stress, the degree of which depends on maximum grain size, solids concentration, and normal stress. Coarse-grained debris-flow material did not exhibit well-defined flow curves based on instantaneous data; shear stresses at a given shear rate varied between ±50–100% of the mean value. Over periods of seconds to minutes this variability is accompanied by more gradual variation of shear stress at constant shear rate. The rheometry of coarse-grained debris-flows resembles that of dense suspensions in its poor precision and reproducibility of viscometric data.
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Published In
Journal of Hydraulic Engineering
Volume 126 • Issue 12 • December 2000
Pages: 938 - 941
History
Received: Dec 29, 1998
Published online: Dec 1, 2000
Published in print: Dec 2000
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