汉源县范家沟泥石流拟设工程治理效果研究

Study on Effect of the Planned Engineering for Debris Flow Control in Fanjia Gully,Hanyuan

范家沟1998年至2020年间先后暴发6次规模不等的泥石流灾害,对沟口工业园区造成严重威胁,因此,有必要对拟设拦砂坝工程治理效果进行研究。本文分析了范家沟的地质条件,利用FLO-2D模拟不同降雨频率下泥石流的运动堆积过程,比较了自然工况及治理工况下拟设拦砂坝防治效果。结果表明:在自然工况下泥石流能冲至沟口工业园区内;在治理工况下,拟设拦砂坝能有效拦截泥石流并使泥石流停积在沟道内。本次模拟结果可对拦砂坝的设计提供一定参考。

From 1998 to 2020,6 times of debris flow disasters occurred in Fanjia Gully,which posed a serious threat to the industrial park on gully mouth.Therefore,it is necessary to study the treatment effect of the proposed check dam project.This paper analyzes the geological conditions of Fanjia Gully,uses FLO-2D to simulate the moving accumulation process of debris flow under different rainfall frequencies,and compares the control effects of the proposed check dam under natural conditions and treatment conditions.The results show that debris flow can reach the industrial park on gully mouth under natural conditions.Under treatment condition,the proposed check dam can effectively intercept debris flow and retain debris flow in the gully.The simulation results can provide certain reference for the design of check dam.