滑坡碎屑流冲击挡桩的模型试验研究

Model Test Study on Impact of Landslide Debris Flow on Retaining Pile

【目的】研究滑坡-碎屑流在真实三维地形上的运动冲击过程及其堆积形态。【方法】使用PFC3D数值模拟重现模型试验,分析碎屑流冲击力的影响因素。【结果】较高的挡桩能更有效地减缓冲击力,并减少碎屑流的运移距离和堆积长度;颗粒粒径或体积增加时,碎屑流造成的冲击力会增大;挡桩所在截面颗粒冲击力大致呈正态分布,中部挡桩所受冲击力最大,往两侧冲击力逐渐减小。【结论】通过数值模拟研究碎屑流冲击力,可为后续防治提供参考。

[Purposes]Study the movement and impact process of landslide-debris flow on real threedimensional terrain and its accumulation morphology.[Methods]Use PFC simulation to reproduce the model test to analyze the influencing factors of debris flow impact force.[Findings]Higher retaining piles can more effectively slow down the impact force and reduce the migration distance and accumulation length of the debris flow;when the particle size or volume increases,the impact force caused by the debris flow will increase;in the section where the retaining piles are located,the particle impact force is roughly normally distributed,with the middle pile receiving the greatest impact force,and the impact force gradually decreasing toward both sides.[Conclusions]The impact force of debris flow is studied through numerical simulation,which provides a reference for subsequent prevention and control.