基于离散元模型的聚合型滑坡碎屑流聚合角度影响研究  

Influence of aggregation angle of aggregated landslide debris flows based on discrete element model

作　　者：杨锟 叶永[1] 谢旋 YANG Kun;YE Yong;XIE Xuan(College of Hydralic and Environmental Engineering,China Three Gorges University,Yichang Hubei 443002,China)

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002

出　　处：《地质科技通报》2025年第2期116-129,共14页Bulletin of Geological Science and Technology

基　　金：国家重点研发计划课题(2021YFC3001903)。

摘　　要：滑坡碎屑流是一种常见的地质灾害,它有着规模宏大、滑动距离远、速度快的特征,而山坡沟谷等地形会影响滑坡碎屑流的运动轨迹,进而对其产生阻拦、转向、堆积等一系列影响,所以滑坡碎屑流不仅仅只有简单的直线路径,受到地形因素的影响,其运动路径复杂多样。本研究主要基于滑坡碎屑流不同运动轨迹中的聚合行为,采用EDEM软件,分析对称聚合型滑坡碎屑流在不同聚合角度中的运动冲击和堆积特性。研究结果表明:①聚合角度对于运动速度的影响:聚合角度越大,颗粒到达聚合点时沿主坡道的速度分量vy越小,滑坡碎屑流分离程度越高,滑坡滑动时间越长;②聚合角度对于堆积形态的影响:聚合角度越大,滑坡稳定在坡脚处,其堆积区的形态,在滑道一侧的长度越长,而在拦挡结构处的高度越小;③聚合角度对于冲击性能的影响:聚合角度越大,对拦挡结构的冲击力峰值越低且越晚出现峰值;在停止运动形成静态堆积区后的残余冲击力也越低,残余冲击力的值也与冲击力峰值越接近。研究成果为滑坡碎屑流复杂路径运动深入研究提供了基础作用,为滑坡碎屑流防治结构优化提供了理论参考。[Objective]Landslide debris flows are common geological disasters characterized by large scale,long sliding distances,and high speeds.The terrain of hillside ravines and valleys significantly influences the trajectory of these flows,causing them to block,turn,pile up,and exhibit a series of complex behaviors.Therefore,the movement path of landslide debris flows is not a simple straight line but is influenced by various terrain factors,resulting in complex and varied trajectories.[Methods]This study focuses on the aggregation behavior of landslide debris flows along different motion trajectories.Using EDEM software,we analyzed the impact and accumulation characteristics of symmetrically aggregated landslide debris flows at various aggregation angles.[Results]This study has reached results in three aspects.1)Effect of the aggregation angle on movement velocity:Larger aggregation angles result in lower vy values,higher degrees of separation of the landslide debris flow,and longer sliding times.2)Effect of the aggregation angle on accumulation morphology:Larger aggregation angles cause the landslide to stabilize at the foot of the slope,with the accumulation zone lengthening on the slide side and decreasing in height at the blocking structure.3)Effect on impact performance:Larger aggregation angles lead to lower and later peak impact forces on the barrier structure.Additionally,the residual impact force after the formation of a static accumulation area is lower and closer to the peak impact force.[Conclusion]These findings provide a fundamental basis for the in-depth study of the complex movement paths of landslide debris flows and offer theoretical references for optimizing landslide debris flow control structures.

关 键 词：滑坡碎屑流 聚合角度 运动特性 冲击力 离散元 EDEM 

分 类 号：P642.22[天文地球—工程地质学]