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Bin Yu, Yuanjing Chen, Qinghua Liu
Experimental study on the influence of coarse particle on the yield stress of debris flows
Appl. Rheol. 26:4 (2016) 42997 (13 pages)
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Former studies show that the coarse particle plays a very important role in the determination of the yield stress of fluid-solid
mixtures such as debris flows. The characteristics of the coarse particle in these mixtures include particle size, gradation, shape,
and type of material. To assess the influence of these coarse particles on the yield stress the concept of equivalent volumetric
solid concentration C is introduced. The equivalent concentration can be derived from the volumetric solid concentration by
considering the particle size, gradation, shape, and type of material. Laboratory experiments to determine the yield stress of
various mixtures were conducted to calibrate the coefficients of these coarse particle characteristics. A yield stress phenomenological
expression is proposed using the refined volumetric solid concentration (equivalent concentration), which could
be calibrated by the experiments in this study. The validation of this phenomenological expression with data from literature
shows good agreements, especially for higher volumetric concentrations of the sediments.
► Cite this publication as follows:
Yu B, Chen Y, Liu Q: Experimental study on the influence of coarse particle on the yield stress of debris flows, Appl. Rheol. 26 (2016) 42997.
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