Abstract: The drainage systems for the channel lower than the ground and the section with the slope less than the deposit slope were studied. Four types of drainage systems for the channel lower than the ground，including seepage well，waterproof shed，evaporation pool and pump station，were suggested and compared. The drainage system in the section with the slope less than the deposit slope included the collecting water ditches and the rapid gutters in the slopes of subgrade etc. Results show that，waterproof shed can be used widely，evaporation pool can only be used in arid area，and pump station can be used in intersections and important channels; the drainage system for the section with the slope less than the deposit slope is stable，and has good economic efficiency and can be used for long time without deposit.

Key words: road engineering, freeway, low filled embankment, drainage system, channel lower than the ground

摘要： 研究了下挖通道处的排水系统和小于淤积坡度路段路表排水系统。对于下挖通道排水系统，提出了渗井、防 雨棚、蒸发池和泵站4种排水方案，并对这4种方案进行了对比和评价。在路肩以及中央分隔带的路缘带设置的 纵向集水沟与路基边坡上的急流槽等组成了小于淤积坡度路段路表排水系统。结果表明:防雨棚适用范围广，蒸 发池仅适用于干旱和半干旱地区，泵站可应用于立交或比较重要的通道;小于淤积坡度路段路表排水系统不会发 生失稳破坏，经济效益好，不易淤积。

关键词: 道路工程, 高速公路, 低路堤, 排水系统, 下挖通道