The collapsible loess region of northwest China highway drainage waterlogging phenomenon is serious,in order to solve this problem,this paper first analyzes the environment of the collapsible loess region climate geological conditions,combining the using status quo of highway drainage system and waterlogging damage status quo,summing up the damage reason of loess area highway drainage facilities.On this basis,this paper designed a set of for collapsibility loess area highway drainage system control scheme,put forward the use of hose materials instead of traditional new tubular jet impingement sockets;At the same time puts forward how to determine the pipe jet slot size and design scheme of the company;Finally its practical application in highway road drainage facilities in the summer of 305 north line repair.The study found that:first,the collapsibility of loess and short time heavy rainfall is the main cause of drainage facilities were damaged.Second,the traditional jet slot drainage facilities in the design of large longitudinal slope,drainage capacity and catchment area don''t match,construction quality and maintenance aspects in defect;Third,the new type tubular rapids in the overall stability and drainage ability can effectively resist water erosion of the loess damage;Through a rainfall period (24 months) and monitoring,the practice of new type pipe jet under 12 times under the condition of moderate rain and 3 times of heavy rainfall is still running well,suggests that energy dissipation reduction rushed,tubular jet combined drainage of slot and slope protection measures are appropriate.Hope that through this article research results,for collapsibility in hazard area of highway drainage design provide certain reference.%我国西北湿陷性黄土地区公路排水设施水毁现象严重,针对这一问题,首先分析了湿陷性黄土地区的环境气候地质条件,分析传统排水系统水毁破坏现状,归纳出黄土地区公路排水设施的破坏原因.以此为基础,提出了利用软管材料代替传统防冲槽的新型管式急流槽公路排水系统防治方案;同时研究了确定管式急流槽尺寸和设计方案的公式;最后将其实践应用于省道305北夏线的公路排水设施修复.研究发现:第一,黄土湿陷性和短时强降雨是导致排水设施损坏的主要诱因;第二,传统的急流槽排水设施在设计纵坡、排水能力与汇水面积不匹配、施工质量和维护等多方面存在缺陷;第三,新型管式急流槽在整体稳定性和排水能力方面能够有效抵抗黄土水蚀破坏;最后通过降雨周期(24个月)的实践和监测,新型管式急流槽在遭受12次中雨和3次强降雨条件下依然运行良好,说明消能减冲、管式急流槽和护坡三者相结合的排水措施是合适的.希望通过本文的研究成果,为处在湿陷性危害地区的公路排水设计方案提供一定借鉴.
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