滑坡碎屑流运动及堵江堰塞体堆积特性模型试验  

Model experiment study on dynamic process of landslide debris and deposition characteristics of barrier body

作　　者：王涓 宋丽婧 刘轶[1] 廖海梅[1] WANG Juan;SONG Lijing;LIU Yi;LIAO Haimei(College of Civil Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学土木工程学院,贵州贵阳550025

出　　处：《人民长江》2023年第2期191-199,共9页Yangtze River

基　　金：国家自然科学基金项目(42107189)。

摘　　要：滑坡堰塞体形成机制复杂,掌握堰塞体堆积特征对其溃决风险评估具有重要意义。通过开展物理模型试验,研究了滑床坡度、滑体物质组成与体积对滑体特性及堰塞体堆积特性的影响。试验结果表明:滑体运动时间随颗粒粒径增大、坡度变陡而变短;单粒径滑体在滑槽前段速度的影响因素重要性排序为粒径、坡度、体积,中后段则为粒径、体积、坡度;分层多粒径滑体在滑槽前后两段的速度主要受坡度影响。单粒径堰塞体长度随着滑体体积增大而增加,且增加速率在陡坡下更快;堰塞体宽度随着体积及颗粒粒径增大而增加,且在陡坡下更敏感。试验数据的逻辑回归分析结果表明:影响堰塞体高度的因素其重要性排序由高到低依次为粒径、体积、坡度;分层多粒径堰塞体长度与坡度无明显相关关系,宽度和高度则随坡度增大而增大。The formation mechanism of landslide barrier dam is complex,mastering the dam deposit characteristics is of great significance for the breach risk assessment.Based on a physical model experiment,we studied the effects of slope gradient,landslide material composition and volume on the sliding movement process and deposition characteristics.The results show that the duration of sliding movement becomes shorter with the increase of particle size and slope gradient.The importance ranking of influencing factors for the single-particle landslide’s speed in the first section is particle size,slope and volume,and in the middle and end sections is particle size,volume and slope.The speed of the mixed particle landslide in the first and end sections is mainly affected by the slope.The length of the barrier dam of single particle increases with the volume,especially the increasing rate is obvious under steep slope,and the width increases with the volume and particle size,and both increase rates are sensitive under steep slope.The logistic regression analysis of experimental data shows that the importance order of influencing factors for barrier dam height is particle size,volume and slope gradient.For the barrier dam of mixed and stratified particle,its length has no obvious correlation with the slope gradient,while its width and height increase with the slope gradient.

关 键 词：堰塞体 滑坡碎屑流 运动过程 堆积特征 模型试验 

分 类 号：P642[天文地球—工程地质学]