不同颗粒级配柱体堆积范围研究  

Depositing Range of Granular Columns with DifferentParticle Gradations

作　　者：黄波林[1,2] 张全 王健 罗朝林[3] 陈小婷 HUANG Bo-lin;ZHANG Quan;WANG Jian;LUO Chao-lin;CHEN Xiao-ting(Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang443002, China;National Field Observation and Research Station of Landslides in Three Gorges Reservoir Area of Yangtze River, China Three Gorges University, Yichang 443002, China;Department of Information and Automation Engineering, Pearl River Water Resources Research Institute, Guangzhou 510611, China)

机构地区：[1]三峡大学防灾减灾湖北省重点实验室,湖北宜昌443002 [2]湖北长江三峡滑坡国家野外科学观测研究站,湖北宜昌443002 [3]珠江水利委员会珠江水利科学研究院信息化与自动化工程研究所,广州510611

出　　处：《长江科学院院报》2020年第10期89-95,共7页Journal of Changjiang River Scientific Research Institute

基　　金：国家重点研发计划项目(2018YFC1504806);三峡大学硕士学位论文培优基金项目(2020SSPY022)。

摘　　要：碎屑流具有冲程远、危害范围大等特性,难以进行有效预测防范。颗粒级配被认为是影响碎屑流运动距离的重要因素之一。开展了一系列基于单面临空不同颗粒级配颗粒柱体崩塌运动的物理模型试验研究。结果表明:颗粒柱体崩塌后,颗粒运动斜向箱体外,水平板上的颗粒运动呈放射状,堆积平面形式为圆形态,颗粒静止轮廓可分别用抛物线、圆的方程拟合,效果较好;颗粒类型相同时,随着颗粒柱体高度的增加,崩塌后颗粒堆积成圆形态的圆心位置有沿着y轴向前移动趋势;颗粒柱体高度相同时,小颗粒的运动距离比大颗粒的运动距离远;颗粒粒径小时,松散堆积区范围小,颗粒的影响区域为密集堆积区范围;反之,颗粒的影响区域为密集堆积区范围+松散堆积区范围。试验研究成果对预测碎屑流堆积区范围具有一定的参考价值。Featured with long stroke and wide range,debris flow cannot be effectively predicted and prevented.Grain size distribution is an important factor affecting the movement distance of debris flow.Physical model tests are carried out to study the collapse movement of granular columns with single free face varying with different particle gradations.After the collapse of granular column,particles move obliquely towards the outside of the box.The particle motion on horizontal plate is radial,and the depositing plane is in the form of a circle.The deposit profile of particles can be well fitted by parabola and circle equations.Given the same particle type,as the granular column becomes higher,the position of the center of the circle in which particles deposit after collapse moves forward along the y-axis.When the height of granular column is fixed,fine particles move farther than large particles.The range of loosely deposited area of small particles is correspondingly small,and the small particles affect only the densely deposited area;large particles affect not only the densely deposited area,but also the loosely deposited area.

关 键 词：颗粒柱体 崩塌模型试验 速度场 堆积区范围 圆形态 颗粒级配 

分 类 号：P642.2[天文地球—工程地质学]