颗粒粒径对滑坡碎屑流动力特征及能量转化的影响——以四川省三溪村滑坡为例

    Influence of particle size on energy evolution of debris flow in landslide based on DEM: A case study of Sanxicun landslide

    • 摘要: 滑坡碎屑流的能量演化机制涉及复杂的碰撞、摩擦和能量转化,对滑坡灾害的防治具有重要意义。以四川省三溪村滑坡为例,采用离散元法建模,研究了不同土颗粒粒径下滑坡的运动堆积特征、能量演化过程及其对建筑物的影响。结果表明,在不同粒径条件下,滑坡的堆积特征变化不大,但它们对能量转换和建筑物的冲击力有显著的影响。粒径越大,滑坡启动速度越快,峰值动能速度越高,碰撞耗散能量越大,摩擦耗散能量越少。粗粒土中颗粒间距越大,颗粒间的碰撞效应越明显,有利于能量传递,因此,对房屋的冲击力越大。因此,在模拟过程中不能忽视颗粒粒径对滑坡碎屑流动力学特征的影响。这些研究结果揭示了不同粒径土粒在滑坡运动过程中的能量演化机制,为能量演化对建筑冲击的影响提供了初步的认识,可为滑坡碎屑流的防治提供指导依据。

       

      Abstract: Understanding the energy evolution mechanism of landslide debris flow is crucial for the prevention and control of landslide disasters, as it involves complex collisions, friction, and energy transformation.Taking the Sanxicun landslide in Sichuan Province as a case study, this research employs discrete element method modeling to investigate the motion deposition characteristics, energy evolution process, and impact on buildings under different soil particle sizes.The results show that the deposition characteristics of landslides do not vary significantly under different particle size conditions.However, they have a significant impact on internal energy conversion and the impact force on buildings.Larger particle sizes result in faster initiation velocity of landslides, higher peak kinetic energy velocity, more energy dissipation caused by collisions but less consumed by friction.The larger inter-particle spacing in coarse-grained soils leads to more pronounced collision effects between particles facilitating efficient energy transfer and increased impact forces on sliding masses.Therefore, the influence of particle size on the flow characteristics of landslide cannot be ignored in the simulation process.These findings reveal the energy evolution mechanism of soil particles during landslide motion under different soil particle sizes and provide preliminary insights into the influence of energy evolution on building impacts.This research offers valuable guidance for preventing and controlling landslide.

       

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