中文摘要：

对于较大地下水埋深的地区较大,改进暗管排水技术是否可以起到除涝作用值得讨论。基于室内土柱试验,考虑地下水埋深、反滤体宽度以及土体介质3个因素,分析了非饱和土体、地表持续积水一定时间后,改进暗排的排水性能。结果表明：细砂土介质中,地下水埋深很大时,常规暗排的排水能力有很大局限性,而改进暗排的排水能力仍然显著;地下水埋深为暗管埋深2倍时,改进暗排自由出流排水流量为相同条件下常规暗排排水流量的2.5~3.5倍,为土体介质完全饱和条件下常规暗排排水流量的2倍;相同地下水埋深条件下,改进暗排在细砂土介质中的排水效果好于粗砂土介质,反滤体宽度对单位时间暗管排出水量和下渗补给地下水水量的比值有很大影响。研究成果可为在地下水埋深较大地区推广应用高效的暗排工程技术提供技术支撑。

英文摘要：

Whether improved subsurface pipe drainage has effect on removing excess surface waterlogging in regions of large ground- water table depth is worth discussing. Based on soil column experiment, the performance of improved subsurface drainage under con- ditions of unsaturated soil and surface ponding was analyzed, considering three factors of groundwater table depth and filter width and soil medium. The results showed that conventional subsurface pipe drainage did not work under large groundwater table depth in fine-sand texture, however, the improved structure＇s drainage still played a role in removing ponded water. In fine-sand texture, im- proved subsurface drainage flow was as 2. 5 ~ 3. 5 times as that of conventional subsurface pipe drainage when groundwater table depth was two times of drain depth （D）, at the same time it was 2 times of conventional subsurface pipe drainage flow with groundw- ater depth of 0D. Improved subsurface drainage capacity was much larger in fine-sand texture than that in coarse-sand texture. Also, filter width had great effect on water quantity ratio of pipe drainage and seepage toward groundwater per unit time. The research re- sults can provide technical support to the application of improved subsurface drainage in regions with large groundwater table depth.