多维反滤回灌井室内稳定流试验研究

Laboratory steady state flow tests on multidimensional recharge well with filter layer

反滤回灌井是山东胶东半岛地下水回灌中常用的回灌设施,它由普通回灌井和回灌池组成。在分析现有反滤回灌井存在问题的基础上,设计了一组回灌量大,又能防淤积、防低水位污水回灌、抗水流冲刷的多维反滤回灌井,给出了单井回灌量的理论计算公式和计算参数;同时,研制了室内稳定流回灌试验装置,进行了普通回灌井、现有反滤回灌井和多维反滤回灌井的室内稳定流试验研究,得出结论:1同现有反滤回灌井相比,多维反滤回灌井的单井回灌量增加了370%~420%;2多维回灌井口的形状影响单井回灌量,在过水断面面积相同的情况下,圆形多维回灌井口的单井回灌量最大;3初次回灌试验中,单井回灌量最大,随回灌试验次数增加,单井回灌量逐渐减小,并趋向于稳定;4单井回灌量与多维回灌井口过水断面开孔率是一个非线性的关系,20%的过水断面开孔率是适宜的。研究成果对于提高反滤回灌井的回灌能力和定量计算单井回灌量具有重要的现实意义。

The recharge well with filter layer is a common device using for recharging groundwater on the Jiaodong Peninsula in Shandong Province of China, and composed of recharge well and pool. By analyzing the problems of the existing recharge wells with filter layer, a group of multidimensional recharge wells with filter layer are designed, which are of a large single-well recharge volume and the advantages of siltation prevention, prevention of wast water recharge and scour resistance. The theoretical formulas and parameters of the single-well recharge volume for multidimensional recharge wells with filter layer are also given. Meanwhile, the laboratory steady state flow recharge test device is developed. The laboratory steady state flow tests on ordinary recharge well, existing recharge well with filter layer and multidimensional recharge wells with filter layer are carried out. The following conclusions are drawn：（1） Under the same conditions, compared with that of the existing recharge well with filter layer, the single-well recharge volume of multidimensional recharge wells with filter layer increases by 370%～420%;（2） The shape of multidimensional recharge wellhead affects single-well recharge volume, and single-well recharge volume of the round multidimensional recharge wellhead is the largest in the same flow section area;（3） The single-well recharge volume is the largest in the first test, and gradually decreases and tends to be stabe with the increasing number of tests;（4） There is a nonlinear relationship between the single-well recharge volume and the inflow section porosity of multidimensional recharge wellhead, and the inflow section porosity is suitable for 20%. The study is of significance for improving the recharge capacity and calculating the single-well recharge volume quantitatively.