| 引用本文: | 胡玲玲,杨树青,梁志航, 等..河套灌区下游排水暗管外包料筛选试验研究[J].灌溉排水学报,2022,41(4):141-148. |
| HU Lingling,YANG Shuqing,LIANG Zhihang, et al.河套灌区下游排水暗管外包料筛选试验研究[J].灌溉排水学报,2022,41(4):141-148. |
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| 摘要: |
| 【目的】筛选适合河套灌区下游的排水暗管外包料。【方法】利用自制水力渗透仪，选取68 g/m2和90 g/m2土工布与5种不同粒径（0.3、0.7、1.0、1.5、3.0 mm）的砂滤料组合，开展室内渗透试验，研究单一土工布和土工布与不同粒径砂滤料组合外包料的渗透性、保土性及防淤堵性。【结果】68 g/m2土工布的系统渗透系数高于90 g/m2土工布，外包料稳定后的渗透系数平均高出系统整体渗透系数稳定值4.5倍，不同水力梯度下，各处理的系统渗透系数稳定值变化范围较小，具有良好的透水和稳定性；68 g/m2土工布加设0.8~1.0 mm粒径砂滤料的处理对外包料的渗透系数提升效果显著，各处理的土壤流失量平均仅为0.5 g，均满足保土要求；90 g/m2土工布的淤堵量与淤堵率显著高于68 g/m2土工布，68 g/m2土工布更能有效防治外包料的淤堵；淤堵率随砂滤料粒径的增大呈高-低-高的变化规律，其中68 g/m2土工布加设1.0 mm砂滤料处理的淤堵率最低，仅为26%。【结论】河套灌区下游适宜的排水暗管外包料建议选用68 g/m2土工布加设1 mm粒径砂滤料的处理，研究结果可为灌区排水暗管外包料的选用提供参考。 |
| 关键词: 排水暗管；土工布；砂滤料；筛选；河套灌区 |
| DOI：10.13522/j.cnki.ggps.2021414 |
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| An Experimental Study on Wrapping Materials of Subsurface Drain for Farmland in the Downstream Hetao Irrigation District |
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HU Lingling, YANG Shuqing, LIANG Zhihang, et al
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1. Inner Mongolia Agricultural University, Hohhot 010018, China；
2. Inner Mongolia Teaching University, Hohhot 010022, China
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| Abstract: |
| 【Objective】 The efficacy and function of subsurface drain is controlled by materials used to warp it which in turn depends on soil texture in the region where they are installed. The purpose of this paper is to study these for drainage of croplands in the downstream Hetao Irrigation district. 【Method】The materials we used were 68 g/m2 and 90 g/m2 geotextile combined with sand particles with size in ranging from 0.3 to 3.0 mm used in the filtering layer. The experiment was conducted in lab, and the ability of the wrapped drain to drain water was measured using an in-house permeameter, from which we analyzed the effects of combination of different wrapping materials and sand size on permeability, soil retention and anti-clogging. 【Result】The system permeability coefficient of the 68 g/m2 geotextile is higher than that of the 90 g/m2 geotextile; the average permeability coefficient after the system stabilized is 4.5 times that of the stable value of the permeability coefficient of the system. Adjusting the hydraulic gradient can improve the permeability coefficient of the system. The variation of the stability value is small, and each treatment has a good water permeability and stability. Wrapping the drain with 68 g/m2 geotextile combined with 0.8 and 1.0 mm sand particles as the filtering layer improved the permeability coefficient significantly. The average soil loss of wrapping with 90 g/m2 geotextile was 0.5 g, meeting the soil conservation requirements and effectively preventing clogging. The clogging rate showed a high-low-high variation with the increase in sand size, and it was the lowest (26%) for wrapping with 68 g/m2 geotextile combined with 1.0 mm sand particles as the filtering layer.【Conclusion】Combining 68 g/m2 geotextile with sand particles sized 1 mm as the filtering layer was optimal for subsurface drains in the downstream farmlands of the Hetao Irrigation District. |
| Key words: subsurface drainage; geotextile; sand filter; screening; Hetao Irrigation District |
