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滑坡–碎屑流因其超常的流动性、超高的滑速以及巨大的能量成为一种具有极端破坏力的地质灾害现象。为实现滑坡–碎屑流三维地形条件下运动全过程的数值模拟,在局部拉格朗日坐标系基础上,考虑滑坡–碎屑流运动过程中滑体下表面的侵蚀作用及摩擦阻力的变化,建立基于有限体积法的计算模型。应用模型对萨尔瓦多的El Picacho滑坡进行反演分析,模拟过程采用距离侵蚀速率参数及Voellmy阻力模型,模拟结果的运动路径及滑动距离与滑坡发生的实际情况吻合较好,表明结合模型方程的数值模拟方法对于滑坡–碎屑流运动过程研究的有效性。此外,计算未考虑滑体下表面侵蚀作用的滑坡运动过程,结果显示滑坡运动物质的总体积减少,滑动距离明显变短。因此,侵蚀作用是滑坡–碎屑流运动过程研究所必须考虑的重要因素之一。滑坡–碎屑流三维运动过程的数值模拟研究可以为该类灾害的危险性评估及风险预测等提供科学的参考依据。
Landslide - debris flow has become an extremely destructive geological hazard due to its extraordinary mobility, superb slippery and huge energy. In order to realize the numerical simulation of the whole process of landslide-debris flow under three-dimensional topography, based on the local Lagrange coordinate system, the erosion and frictional resistance of the lower surface of the landslide-debris flow are considered , The calculation model based on finite volume method is established. The model is applied to the inversion of the El Picacho landslide in El Salvador. The distance erosion rate and the Voellmy resistance model are used in the simulation. The results show that the movement path and the sliding distance are in good agreement with the landslide occurrence. Method for the study of landslide - debris flow movement of the effectiveness. In addition, the landslide motion process without considering the erosion of the lower surface of the slide body is calculated. The results show that the total volume of the landslide movement material decreases and the sliding distance is significantly shorter. Therefore, erosion is one of the important factors that must be considered in landslide-debris flow movement research. Landslide - debris flow three-dimensional movement of the numerical simulation can provide a scientific reference for the hazard assessment and risk prediction of such disasters.