Experimental Study on Settlement Characteristics of Grading Particles in Debris Flow Slurry

Sedimentation characteristic of solid particle in debris flow slurry is a basic scientific question of debris flow dynamics. Debris flow slurry is made by cellulose and tap water, and then put solid particle in debris flow slurry to develop debris flow, and then put them to the settlement observation device. To choose four kinds viscosities of debris flow slurry (viscosity for 0.1 Pa.s,0.3 Pa.s,0.5 Pa.s, and 0.7 Pa.s) and four kinds particle sizes of macadam (size for 2∼5 mm, 5∼10 mm, 10∼16 mm, and 16∼20 mm), and then sixteen kinds of experiment conditions confirmed. Adopting high speed camera records the process about the sedimentation of grading particles in debris flow slurry. The experimental data shows that the settlement duration of solid particles in the debris flow presents linear trend of increase, the larger the particle diameter is, the greater the settling velocity is, the biggest velocity is 46.39 cm/s (condition four); and the bigger the paste viscosity is, the smaller the particle settling velocity is, the smallest velocity is only 13.98 cm/s (condition thirteen). The results have positive significance for the study of debris flow impacting load research.