Determination of the suspension competence of debris flows based on particle size analysis

作     者：Hong-juan YANG Fang-qiang WEI Kai-heng HU Chuan-chang WANG 

作者机构：Key Laboratory of Mountain Hazards and Earth Surface ProcessChinese Academy of Sciences Institute of Mountain Hazards and EnvironmentChinese Academy of Sciences 

出 版 物：《International Journal of Sediment Research》 (国际泥沙研究(英文版))

年 卷 期：2014年第29卷第1期

页      面：73-81页

核心收录：

学科分类：08[工学] 0837[工学-安全科学与工程] 

基　　金：supported by the National Basic Research Program of China(973 Program)(No.2011CB409902) National Natural Science Foundation of China(No.41201011) the Youth Talent Team Program of Institute of Mountain Hazards and Environment,CAS(No.SDSQB-2010-01) 

主　　题：Debris flow Suspension competence Particle size analysis Critical particle size Particle suspension mechanism 

摘      要：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 *** 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;and it increases with bulk density of more concentrated *** competence of natural debris flows in Jiangjia Gully increases exponentially with the bulk *** two data sets are compared in order to understand the suspension *** 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.