两相物质组成对泥石流固相流速特征的影响
Effects of the Two-phase Compositions on the Solid-phase Velocity of Debris Flows
何晓英 1张展 1于泽清 2王智3
作者信息
- 1. 重庆交通大学河海学院,重庆 400074
- 2. 重庆交通大学河海学院,重庆 400074;中机中联工程有限公司,重庆 400074
- 3. 中机中联工程有限公司,重庆 400074
- 折叠
摘要
固相颗粒流速是研究泥石流冲击力和防治结构荷载取值的关键问题.基于水槽模型试验,采用粒子图像测试技术提取黏性泥石流表面固相颗粒流速,基于两相流模型探讨浆体黏度、固相体积浓度与颗粒粒径对泥石流固相粗颗粒流速特征的影响.结果表明:泥石流龙头现象随浆体黏度与固相体积浓度增大而减弱;固液相相对运动随浆体黏度增加而减弱,大黏度与小粒径组合条件下消失;固相颗粒流速随浆体黏度与固相体积浓度呈正相关,与颗粒粒径呈负相关.两相物质组成影响固相颗粒间的摩擦力与/或碰撞力、浆体施加的黏滞阻力、拖曳力与虚拟质量力,其对流速的影响还需进一步深入研究.
Abstract
The velocity of solid-phase particles of debris flows is a key issue for its kinematics and prevention measures.Flume model tests and particle image velocimetry were conducted to get the solid-phase velocity of debris flow.Effects of slurry viscosity,volume con-centrations and particle sizes on the solid-phase velocity characteristics were accordingly analyzed by adopting two-phase debris flow mod-el.The results show that the high-concentrated-particle debris flow head gets weak with the increase of slurry viscosity and volume con-centration.The relative motion between solid and liquid phase decreases with the increase of slurry viscosity,and it vanishes when the volume concentration is big and the particles are small.The solid-phase velocity of debris flow has a positive correlation with the slurry viscosity and volume concentration,and has a negative correlation with the particle size.Two-phase composition of debris flows affect the force of friction and/or collision between solid-phase particles,and the viscous resistance force,the viscous drag force and the virtual mass force acting on particles,which are induced by slurry.The influence of these forces on the solid-phase velocity needs further study.
关键词
泥石流/固相颗粒流速/两相流理论/粒子图像测试技术Key words
debris flow/solid phase velocity/two-phase debris flow model/particle image velocimetry引用本文复制引用
基金项目
国家自然科学基金(51608083)
第二次青藏高原综合科学考察研究(2019QZKK0902)
水利水运工程教育部重点实验室开放基金(SLK2021B05)
国家自然科学基金区域创新发展联合基金(U22A20600)
重庆市研究生联合培养基地建设项目(JDLHPYJD2020026)
出版年
2024
NETL
NSTL
万方数据