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泥石流是我国常见的一种地质灾害。位于泥石流区的公路路基常常由于受到泥石流的冲击而毁损严重,甚至导致交通的中断。泥石流冲击路基是一个复杂的三维问题,通过分层法将其简化为平面问题,建立了泥石流冲击作用下路基毁损的力学模型,并通过稳定性分析和叠加原理得到了确定冲击坑形状的计算方法。最后通过将泥石流冲击坑的形状与路基自稳的临界坡度相结合得到了路基受泥石流冲击后的最终破坏形态。
Debris flow is a common geological disaster in our country. Highway embankments located in the debris flow area are often severely damaged by the impact of debris flow and even lead to the interruption of traffic. The debris flow impact subgrade is a complicated three-dimensional problem, which is reduced to a plane problem by the stratification method. The mechanical model of the subgrade under the impact of debris flow is established. The calculation method for determining the shape of the impact pit is obtained through the stability analysis and the superposition principle . Finally, by combining the shape of debris flow crater with the critical slope of subgrade stabilization, the ultimate failure mode of subgrade after being hit by debris flow is obtained.