沿海土地整治区地下排水模式设计研究

Pattern of Subsurface Pipe Drainage in New Reclamation Land of Coastal Area

暗管排水系统排水脱盐效果能否充分发挥,取决于暗管埋设深度和埋设间距等布置参数选择是否合理。【目的】根据沿海土地整治区排盐需求,通过理论计算探究地下排水的最优模式。【方法】详细阐述了暗管排水工程设计布置参数计算过程,以江苏省南通市如东县九龙垦区暗管排水试验区为例,探究暗管埋设深度与间距对排水脱盐效果的影响。【结果】排水量占比随暗管埋深增加而增加,随埋设间距增加而减小,排水效果最好组合为埋深1.2 m埋设间距10 m组合。排盐率随暗管间距增加逐渐减小,排盐率随暗管埋深增加先增加后减小,埋深0.9 m暗管间距10 m时排盐效果最佳。【结论】研究区采用0.9～1.2 m的暗管埋设深度和10 m的埋设间距为最优设计。

The effect of desalination in the drainage system depends on the reasonable selection of the arrangement parameters such as the depth and spacing of the pipe.【Objective】According to the demand for salt discharge in coastal land remediation area,the optimal mode of underground drainage is explored through theoretical calculation.【Method】In this paper,the calculation process of design layout parameters of subsurface pipe drainage engineering was described in detail.Taking the experimental area of subsurface pipe drainage in Rudong county,Nantong city,Jiangsu province as an example,we studied the influence of buried depth and spacing on drainage desalting effect.【Result】The proportion of drainage amount increased with the depth of underground plastic pipes,and decreased with the space of underground plastic pipes.The optimum design was a combination of buried depth of 1.2 m and spacing of 10 m for drainage.The salt draining amount decreased with the depth of underground plastic pipes,and increased first then decreased with the space of underground plastic pipes.The optimum design was a combination of buried depth of 0.9 m and spacing of 10 m for salt drainage.【Conclusion】The combination of depth of 0.9~1.2 m and the space of 10 m is the optimum design according to theoretical calculation in this study area.