泥石流V型排导槽防淤设计方法及其应用研究

排导槽是泥石流治理常用的工程措施,泥石流若在槽内淤积,将极大影响排导槽防治效果。目前国内现行规范中没有关于排导槽淤积情况计算的相关条款,导致排导槽被泥石流淤埋的工程事故时有发生。鉴于此,分析了排导槽淤堵的常见原因,对现有的一些排导槽淤积验算公式进行了分析和整理,提出了一套基于槽宽验算、槽内泥深及流速验算等公式的排导槽防淤设计验算方法。该方法在雅(安)泸(沽)高速公路沿线某泥石流沟V型排导槽淤埋事故的处理中进行了应用,重建的排导槽经受了2011年6月17日特大暴雨形成的泥石流的考验,说明该方法实施效果良好,可供相关研究与设计参考。

Research on the Anti-silting Design Approach and Application in the Drainage Canal of Debris Flow

Drainage canal is a conventional mitigation and control works of debris flow,of which mitigation efficiency will be immensely influenced due to the debris flow silting in it.Until now there is no illustration about the calculation of its silting in the domestic reference standards,which causes the drainage canal silting accidents occur occasionally.In the view of this,the common causes of drainage canal silting are analyzed,and a serious silting check calculation formulas are advanced,then a set of drainage canal silting check calculation method based on canal width check,mud depth check,velocity check are proposed.This approach was applied in the silting accident removal of debris flow drainage canal at Sekeniluo valley along the Yalu highway under construction,the rebuilt drainage canal also withstand the debris flow caused by the torrential rain at Jan.17.2011,which means that the approach is well-responded and can serve as a reference for related research and engineering design.