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跨越泥石流沟的公路桥梁、涵洞结构易受到泥石流及山洪的冲击,因此常会造成不同程度的破坏。位于泥石流区的桥梁墩台地基在泥石流爆发时受到泥石流的冲刷下切作用,基础逐渐被掏蚀而形成一定程度的冲刷坑。基于突变河流对于山区沿河公路路基的冲刷模型,以被泥石流冲刷破坏的桥梁墩台为研究对象,分析了泥石流对于桥梁墩台地基的掏蚀机理,并研究了冲刷坑形成后桥梁上部结构稳定性的变化。最后通过相关工程实例的计算,验证了该破坏机制的合理性。
Roads and bridges across the debris flow ditch, culvert structures vulnerable to debris flow and flash floods, it will often result in varying degrees of damage. The foundation of the pier and abutment located in the debris flow area is under the scour and cutting action of debris flow when the debris flow burst, and the foundation is gradually undercut to form a certain degree of scouring pit. Based on the model of abrupt river scouring on the embankment of mountainous highway along the riverbank, taking the pier and abutment destroyed by debris flow as the research object, the erosional mechanism of debris flow on the abutment of bridge abutment is analyzed and the stability of the superstructure of the bridge after scouring pit is formed Sexual changes. Finally, through the calculation of relevant engineering examples, the rationality of the damage mechanism is verified.