黄土地区公路排水沟渠出口破坏机理及工程防治

Damage mechanism and protection of highway ditch exit at loess area

通过大量调查和工程经验,研究发现在黄土地区公路建设中,公路排水沟渠出口破坏不仅影响路基边坡的稳定性和正常使用功能,而且给公路后期养护带来极大的困难,增加公路养护成本。结合工程力学和流体力学知识,分析了黄土地区公路排水沟渠出口破坏的形式以冲刷坑、湿陷坑为主;原因是黄土具湿陷性、抗蚀性差,出口水力条件不利。针对黄土地区特点提出了相应的工程防治措施,包括消能减冲、防止湿陷、防止结构失稳三方面工程措施,可应用于黄土地区公路排水系统设计及其病害治理。

According to the investigation and experience of highway engineering, this paper discovered that the broken of ditch exits at loess area can not only affect the roadbed stability and traffic safety, but also bring difficulty and high cost to highway maintenance. The main form of ditch exit destroy is scour pit and collapsible pit by the knowledge of engineering mechanics and fluid mechanics, and the reasons is the collapsibility and wash-out of loess. This paper brought out a list of prevention measures, including dissipation energy, prevention collapsibility and prevention structural break. Those measures can be used in highway drainage system at loess area.