国际泥沙研究（英文版）
國際泥沙研究（英文版）
국제니사연구（영문판）
INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
2014年
1期
73-81
,共9页
Debris flow%Suspension competence%Particle size analysis%Critical particle size%Particle suspension mechanism
The determination of the critical particle size between solid and fluid phases, i.e., the suspension competence, is fundamental for debris flow. A method for determining suspension competence based on particle size analysis is presented in this paper. Suspension competence of static experimental water-debris mixtures prepared with the sediment of Jiangjia Gully is~0.025 mm if the bulk density is less than 1,800 kg m-3 and it increases with bulk density of more concentrated mixtures. Suspension competence of natural debris flows in Jiangjia Gully increases exponentially with the bulk density. These two data sets are compared in order to understand the suspension mechanism. It is concluded that turbulence may play a leading role in particle suspension in non-viscous and sub-viscous debris flows, while in viscous debris flows both matrix strength and excess pore water pressure play important roles.
