[1]唐金波,等.黏性泥石流冲起爬高计算[J].山地学报,2017,(06):842-848.[doi:10.16089/j.cnki.1008-2786.000285]
　TANG Jinbo,HU Kaiheng,SU Fenghuan.Determination of Run-up of Viscous Debris Flow[J].Mountain Research,2017,(06):842-848.[doi:10.16089/j.cnki.1008-2786.000285]
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黏性泥石流冲起爬高计算()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2017年06期
页码:
842-848
栏目:
山地灾害
出版日期:
2017-11-30

文章信息/Info

Title:
Determination of Run-up of Viscous Debris Flow
文章编号:
1008-2786-(2017)6-842-07
作者:
唐金波1;  2; 胡凯衡1*; 苏凤环1
1.中国科学院山地灾害与地表过程重点实验室,成都 610041; 中国科学院水利部成都山地灾害与环境研究所,成都610041; 2.四川大学 水力学与山区河流保护国家重点实验室,成都610065
Author(s):
TANG Jinbo1; 2;  HU Kaiheng1;  SU Fenghuan1
1.Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, Chengdu 610041, China; Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; 2.State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065,China
关键词:
黏性泥石流;  冲起爬高;  水槽实验;  蒋家沟
Keywords:
viscous debris flow;  run-up;  flume experiment;  Jiangjia Gully
分类号:
P642.22
DOI:
10.16089/j.cnki.1008-2786.000285
文献标志码:
A
摘要:
泥石流冲起爬高是泥石流防治工程设计中的一个重要参数。黏性泥石流是一种特殊的固、液两相流体,固、液两相间的相互作用很弱,流体整体性表现为粘塑性流体。在运动过程中,由于黏粒含量高,液相浆体表现出非常大的宏观黏性,而浆体的屈服应力和固相颗粒间的摩擦作用使得泥石流体表现出了很强的塑性特性。本文以黏性泥石流作为研究对象,考虑泥石流龙头的运动平衡方程,建立了一个简单的黏性泥石流运动爬高的物理模型。结合运动平衡方程的解和障碍物的几何特性,推导了黏性泥石流的冲起爬高的计算公式。参数敏感性分析表明,泥石流的冲起爬高随着障碍物迎面坡度和泥石流流速的增加而增加,随着障碍物坡面的摩擦系数和泥石流密度的增加为减小,而泥石流的泥深、液相浆体的屈服应力及动力粘性对泥石流的爬高影响较小。进一步的分析表明,黏性泥石流冲起爬高的计算公Hp=aV2/2g主中的动能修正系数a与泥石流的密度及障碍物的迎面坡度和摩擦系数有关, 可表示为a=sin θ/[sin θ+Cs(ρs-ρf)/ρ cos θ tan φ]。利用水槽实验和云南蒋家沟野外采集的泥石流动力学参数和爬高数据,验证了本文提出的黏性泥石流冲起爬高的计算公式的可靠性。
Abstract:
Debris flow run-up is one of the key considerations in engineering mitigation design, particularly in the case of viscous debris flow, which usually was considered as granular-liquid two-phase flow.Due to its high clay content, viscous debris flow travels with higher viscosity, usually treated as visco-plastic flow in the modelling.Such plastics behavior of debris flow was ascribed to the interaction result of yield stress of liquid phase and friction stress between particles.In this study, run-up of viscous debris flow was addressed and a simplified physical model was developed based on momentum equilibrium equation for the debris flow front.The bottom shear stresses consisted of the stress of liquid slurries and was simulated by Bingham model and the friction stress between coarse particles and the surface of barrier.The calculation formula of viscous debris flow run-up was obtained through combining the solution of momentum equation for debris flowfront with the geometric characteristics of the barrier.The sensitivity analysis of the parameters showed that debris flow run-up increased with the increasing of velocity of debris flow and slope of barrier, and decreased with the decreasing of density of debris flow and friction coefficient between coarse particles and the surface of barrier.However, height of debris flow and dynamical parameters of liquid-slurry had less effect on the run-up of debris flow.Therefore, viscous debris flow run-up depended mainly on velocity of debris flow, slope of barrier and friction coefficient between coarse particles and the surface of barrier.Ignoring the resistance due to liquid slurry, the debris flow run-up could be calculated with the model, i.e.Hp=aV2/2g.Furthermore, the coefficient a in the debris flow run-up model, was depends on the density of debris flow, the slope of barrier and friction coefficient between coarse particles and the surface of barrier and can be modeled as a= sin θ /[sin θ+Cs(ρs-ρf)/ ρ cos θ tan φ].The proposed model was verified using experiment data and field measurement at the Jiangjia Gully.

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备注/Memo

备注/Memo:
收稿日期(Received date):2016-09-23; 改回日期(Accepted date):2016-10-11
基金项目(Foundation item):中国科学院科技服务网络计划(STS计划)项目(KFJ-EW-STS-094); 国家自然科学基金青年基金项目(41601011); 四川省科技支撑项目(2014SZ0163)资助[Technology Service Network Initiative of CAS(KFJ-EW-STS-094); National Natural Science Foundation of China(41601011); Sichuan Province Science and Technology Support Project(2014SZ0163).]
作者简介(Biography):唐金波(1986-),男,云南泸西人,助理研究员,在职博士研究生,从事泥石流运动机理及数值模拟研究[Tang Jinbo(1986-), male, born in Luxi, Yunnan, research assistant, Ph.D candidate, mainly engaged in dynamical mechanics and numerical simulation of debris flow.] E-mail: jinbotang@ imde.ac.cn
*通信作者(Corresponding author):胡凯衡(1975-),男,江西瑞金人,博士,研究员,主要从事泥石流减灾理论与技术、泥石流动力学过程与数值模拟研究[Hu Kaiheng, male, born in Ruijin, Jiangxi Province, Ph.D, professor, mainly engaged in mitigation theory and technology of debris flow and dynamical mechanics and numerical simulation of debris flow.] E-mail:khhu@imde.ac.cn.
更新日期/Last Update: 2017-11-30