基于FLO-2D的核桃沟泥石流数值模拟分析

Numerical Simulation of Debris Flow in Hetao Gully Based on FLO-2D Model

铁路沿线泥石流灾害将对铁路隧道和桥梁施工和运营造成极大危害。文章选取核桃沟为研究对象,运用FLO-2D软件模拟不同周期的降雨过程,并提取降雨过程线计算泥石流洪峰流量。通过与雨洪法计算结果对比,验证了根据降雨过程线确定泥石流洪峰流量的合理性,进而对不同暴雨重现周期下核桃沟支沟和主沟泥石流发生过程进行模拟。核桃沟支沟泥石流模拟结果与分析表明,不同重现周期下,泥石流对支沟2~#斜井、沟谷居民安置点以及工程项目部的威胁较大,建议加强对支沟的泥石流监测预警。核桃沟主沟泥石流模拟结果与分析表明,不同重现周期下,核桃沟大桥处泥石流流速与堆积厚度有增大趋势;在50或100a一遇情况下,泥石流对核桃沟大桥的影响较大。

The debris flow disaster along the railway line will threaten the construction and operation safety of railway tunnels and bridges.In this paper,the Hetao gully was selected as the research object,and FLO-2 D software was used to simulate the rainfall process under different recurrence periods,the rainfall process line was used to calculate the peak discharge of debris flow.Compared with the calculated results by the rain-flood method,the rationality of calculated peak discharge of debris flow from the rainfall process line was verified.Furthermore,the occurrence process of debris flow in the Hetao branch gully and main gully under different recurrence periods of heavy rainfall was simulated.The analysis of the simulation results of debris flow in Hetao branch gully shows that under different recurrence periods,the debris flow would threaten the No.2 inclined shaft,the settlements of residents in the valley,and the campsite of the project department.It is suggested that field monitoring and early warning of debris flow in the branch gully should be strengthened.The simulation results of debris flow in the Hetao main gully show that the debris flow velocity and accumulation thickness at the Hetao gully bridge have an increasing trend under different recurrence periods,and the debris flow has a greater impact on the Hetao gully bridge in case of 50-year recurrence or 100-year recurrence.