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该项研究工作是在调查研究、野外勘探和试验并取得有关水文地质参数的基础上,应用电阻网络模拟和有限元电算原理,建立了自洋淀二维渗流模型,取强、弱两个典型渗流段,经过百余组的试验和计算,提出沟深、沟距和控制水位的组合关系。为平原洼淀蓄水截渗排水工程规划设计提供了依据。实际观测与模型试验表明,千里堤截渗沟控制地下水位,防治周边土地盐碱化的作用是显著的。研究结果认为,以堤沟间距采用150—200米,截渗沟控制水位5.0—5.5米为宜。此时90％以上的渗流量被截入沟,弱渗流段单宽渗漏量为0.20—0.30米~3/日·米,强渗流段为0.59—0.78米~3/日·米。修截渗沟比不修截渗沟渗流量大10—20倍。这些数据可供水文地质条件类似地区设计截渗工程参考。
Based on the investigation, field exploration and experiment and the related hydrogeological parameters, this research work established a two-dimensional seepage model of ocean from the perspective of resistivity network and finite element method, taking two models of strong and weak A typical seepage section, after a hundred groups of tests and calculations, put forward a combination of groove depth, groove spacing and control of the water level. It provided the basis for the planning and design of the drainage and drainage engineering in the plain depression. The actual observation and model tests show that the effect of controlling the groundwater level at the Qianli embankment for controlling the salinization of the surrounding land is remarkable. According to the result of the study, the embankment ditch spacing is 150-200 meters, and the intercepting ditch is 5.0-5.5 meters. At this time, more than 90% of the seepage was intercepted into the trench. The single-unit seepage in the weak seepage section was 0.20-0.30 m ~ 3 / day · m, and the strong seepage section was 0.59-0.78 m 3 / day · m. Repair cut-off gutter than the cut-off gutter seepage flow 10-20 times. These data allow the design of seepage control engineering for similar areas of hydrogeological conditions.