天山公路沟谷型泥石流动力学研究

泥石流是天山公路沿线发育最典型的地质灾害,是道路路基、路面、桥涵结构强烈的毁损动力。为了掌握泥石流运动变化规律,正确设置公路泥石流防治结构,提高防治结构防治公路泥石流病害的可靠性,作者开展了泥石流动力学研究。将泥石流体视为均匀介质,基于动量定理,建立了沟槽内泥石流体对沟槽土埂法向冲击力计算方法;基于土质力学、摩擦静力学原理建立了土埂稳定效应计算方法;创建了沟谷泥石流流通沟槽发生改道运动的判断标准。研究成果为合理设置公路泥石流防治结构提供了理论依据、增强了工程结构防治泥石流地质灾害的可靠性,进而提高了道路运输的安全性。

Research on dynamics of valley-shaped debris flow along Tianshan Highway

Debris flow is the most typical geological disaster along Tianshan Highway,and it seriously threats the roads,bridges and culverts.To understand the law of debris flow movement,choose the right control structure,and improve the reliability of debris flow control works,the authors researched the dynamics of debris flow.By regarding the debris flow as homogeneous medium and based on momentum theory,the authors founded the calculating method of vertical impacting force between debris flow and groove earth.And the authors put forward the hillock stabilization effect calculating method based on soil mechanics and static friction theory.At last,the authors presented the standard to judge debris flow changing its course in grooves.The results offer the theory basis for setting debris flow control structure reasonably along highways,and enhance the reliability of engineering control structure against debris flow and the security of traffics.