公路边坡排水淤堵分析及新型仰斜排水孔应用研究

公路边坡通常是采用PVC塑料管外包土工布进行坡体的地下水排水处治,然而这种结构的仰斜排水孔在地层环境的长期机械、生物及化学作用下容易发生淤堵,导致排水功能逐渐减弱,甚至失效,致使大量的地下水滞留在坡体中,给边坡的安全带来隐患。依托京港澳高速公路小塘至甘塘段(K16+930~K17+000)右侧边坡开展了新型排水孔现场试验应用研究,提出了新型仰斜排水孔设计与施工的方法。通过两年的运行监测结果表明:新型仰斜排水孔较原排水孔雨季每天排水流量提高了10倍,排水效果显著。同时,防止淤堵效果很好,能延缓化学淤堵的产生,提高了排水孔的耐久性。

Analysis of Drainage Clogging on Highway Slope and Research on Application of New-type Upward Inclined Drainage Hole

The PVC plastic pipe wrapped by geotextile is generally used for groundwater drainage treatment on highway slope. However, the upward inclined drainage hole of this structure is prone to clogging under the long-term mechanical, biological and chemical action of stratum environment, resulting in gradually weakening, even failure of the drainage function, then a large amount of groundwater stranded in the slope and causing potential safety hazard to the slope. This paper carries out the field test and applied research of new-type drainage hole on the right side slope of Xiaotang-Gantang Section (K16+930~K17+000) of Beijing-Hong Kong-Macao expressway, and proposes the design and construction method of new-type upward inclined drainage hole. The operation monitoring results for two years show that the rainy season displacement increased 10 times a day compared with the new-type upward inclined drainage hole and the original drainage hole. At the same time, it’s effect is very good for prevent mechanical clogging.It delayed the formation of chemical clogging and improved the durability of drainage hole.