河南城建学院学报2026，Vol.35Issue(4)：10-19,10.DOI:10.14140/j.cnki.hncjxb.2026.04.002
颗粒级配对干颗粒流运动与堆积特征的影响机理
Influence mechanism of particle gradation on the mobility and deposition characteristics of dry granular flows
摘要
Abstract
Geological hazards such as collapses,landslides and pyroclastic flows often exhibit the kinematic characteristics of wide-graded granular flows.Particle size and its distribution exert significant influences on disaster intensity.To reveal the influence mechanism of particle-size distribution on the mobility and deposi-tion characteristics,flume model tests and PFC3D numerical simulations of dry granular flows with six parti-cle-size distributions were conducted under a fixed volume and slope condition.Results show that in sin-gle-sized granular flows,a larger particle size corresponds to a smaller final deposit length and width.In graded granular flows,a higher content of coarse particles leads to a shorter deposit length,accompanied by inverse grading deposition,which becomes more pronounced with an increasing proportion of large parti-cles.Velocity sorting is observed in all granular flows with different size distributions,characterized by high-er front velocity than the trailing one and higher top velocity than the bottom one.In single-sized granular flows,smaller particles yield higher peak velocities;in graded granular flows,a higher proportion of fine par-ticles results in a relatively higher peak velocity,with the maximum peak velocity reaching 2.92 m·s-1.In terms of force chain evolution,single-sized granular flows feature large inter-particle voids,resulting in a sparse and discrete force chain network lacking effective connectivity and thus lower peak velocities.In grad-ed granular flows,fine particles fill inter-particle voids,densifying the force chain network and favoring the formation of a"gathered"deposit.关键词
颗粒流/粒径分布/堆积特征/运动距离/力链演化Key words
granular flow/particle-size distribution/deposition characteristics/run-out distance/force chain evolution分类
天文与地球科学引用本文复制引用
孟紫阳,缪海波,徐盛,崔玉龙..颗粒级配对干颗粒流运动与堆积特征的影响机理[J].河南城建学院学报,2026,35(4):10-19,10.基金项目
国家自然科学基金项目(42277136,42577176) （42277136,42577176）
