摘要
灌溉回归水再利用问题是西北干旱、半干旱地区农业灌溉亟待解决的问题,已有研究表明,由管壁裹土工布+砂砾石复合的农田排水暗管外包料的滤土、排水效果显著。为探究该类外包滤料的防淤堵情况,结合宁夏银北灌区暗管排水循环利用问题,采用砂砾石、沸石、炉渣材料和当地常用管壁外裹土工布构造了排水暗管的复合型外包滤料结构,通过室内土柱渗透试验,分析研究了复合型外包滤料的防淤堵性状与评价方法。试验结果表明,复合型外包滤料的防淤堵效果优于仅铺设土工布的情况,而传统砂砾石与吸附性材料之间的防淤堵效果存在细微差别;复合型外包滤料可以使用沸石、炉渣等吸附材料代替砂砾石,但应满足滤料的级配条件,在C_(u)>4的同时不宜缺少小粒径滤料;滤料部分的水力梯度值占复合型外包滤料的总体水力梯度值的百分比更大;考虑外包滤料内部各结构权重的改进梯度比方法用于分析判断暗管外包滤料的防淤堵情况是可行的。
The reuse of irrigation water is an urgent problem for agricultural irrigation in arid and semi-arid regions of northwest China.Some research have showen that the composed envelope of geotextile and sand gravel has a remarkable filtering effect in the drainage process of farmland subsurface drainage pipe.In order to explore the anti-clogging situation of this kind of filter material,combined with the reuse of irrigation water resources in Ningxia,in this study,sand,zeolite and slag were used as filter materials,and a common geotextile was selected to construct composite envelope structures for subsurface drainage pipes.Based on four groups of indoor soil column permeability tests,an idea of improving gradient ratio method was proposed.Considering the weight of each internal structure,the anti-clogging situation of composite filter material was analyzed and studied.The test results show that the anti-clogging effect of composite envelope is better than that of only laying geotextile,while the anti-clogging effect of traditional sand gravel and absorbent material is slightly different.The composite envelope can use zeolite,slag and other adsorption materials to replace sand gravel,but it should meet the grading conditions of the filter material.When C_(u)>4,it should not be short of small particle size filter material.The hydraulic gradient value of the filter material part accounts for a larger percentage of the overall hydraulic gradient value of the composite envelope.It is feasible to use the improved gradient ratio method considering the weight of each structure in the envelope to analyze and judge the siltation prevention situation.
作者
马明泽
王红雨
李杰
金铭锐
马俊毅
郭丽平
MA Ming-ze;WANG Hong-yu;LI Jie;JIN Ming-rui;MA Jun-yi;GUO Li-ping(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Engineering Technology Research Center of Water-Saving and Water Resource Regulation in Ningxia,Yinchuan 750021,China;Engineering Research Center for Efficient Utilization of Modern Agricultural Water Resources in Arid Regions,Ministry of Education,Yinchuan 750021,China)
出处
《节水灌溉》
北大核心
2023年第4期1-8,共8页
Water Saving Irrigation
基金
宁夏自然科学基金重点项目(2021A0609)
国家自然科学基金项目(41462010)
宁夏大学研究生创新项目(GIP2021052)。
关键词
暗管排水
复合外包滤料
防淤堵机理
改进梯度比方法
砂砾石
沸石
炉渣
subsurface drainage
composite envelope
anti-clogging mechanism
improved gradient ratio method
sand gravel
zeolite
slag
作者简介
马明泽(1998-),女,硕士研究生,主要从事排灌工程及水工建筑物病害治理。E-mail:742317034@qq.com;通讯作者:王红雨(1961-),男,教授,博士,主要从事水工及岩土工程的教学科研工作。E-mail:why.nxts@163.com。
