中国地质灾害与防治学报2025，Vol.36Issue(6)：1-11,11.DOI:10.16031/j.cnki.issn.1003-8035.202502004
高速远程滑坡反粒序堆积体中细颗粒迁移-沉积特性试验研究
Experimental study on migration-deposition characteristics of fine particles in inverse-graded deposits from high-speed long-runout landslides
摘要
Abstract
Rainfall-induced migration and deposition of fine particles within inverse grading deposits can disrupt internal structural stability and increase the risk of secondary geological hazards such as landslides and debris flows.To investigate the influence of fine particle migration and deposition characteristics on the stability of inverse grading deposits,this study conducted laboratory-scale permeability tests,comparing the effects of varying particle concentrations,particle sizes,and seepage velocities on the migration-deposition behavior of fine particles in inverse grading deposits.The experimental results indicate that both particle size and seepage velocity significantly influence the migration and deposition of fine particles.When the median particle sizes were 4 μm and 18 μm,the turbidity of the outflow increased with higher seepage velocities.In contrast,for a median particle size of 34 μm,turbidity significantly decreased,indicating that larger particles exhibit weaker migration capacity under the same conditions.Additionally,the non-uniform distribution of porosity strongly influenced deposition behavior:coarse porosity in the upper layer limited deposition,while smaller pores in the middle layer promoted particle interception and accumulation.This study systematically identifies the migration and deposition characteristics of fine particles in inverse grading deposits under rainfall-driven conditions and highlights the critical influencing factors.The findings provide theoretical support for further research on rainfall-induced landslides and debris flows in inverse grading deposits.关键词
反粒序/穿透曲线/悬浮颗粒/迁移特性/高速远程滑坡Key words
inverse grading/penetration curves/suspended particles/release characteristic/rock avalanche分类
天文与地球科学引用本文复制引用
卫靖文,范勇,杨广栋,丁胜勇,崔先泽..高速远程滑坡反粒序堆积体中细颗粒迁移-沉积特性试验研究[J].中国地质灾害与防治学报,2025,36(6):1-11,11.基金项目
水电工程施工与管理湖北省重点实验室(三峡大学)开放基金项目(2023KSD13) （三峡大学）
长江科学院开放研究基金项目(CKWV20221036/KY) （CKWV20221036/KY）
湖北省自然科学基金项目(2022CFB248) （2022CFB248）
国家自然科学基金项目(41702254) （41702254）
