摘要
对地下水在多孔介质中的渗流情况进行实验研究.通过采用实验室内渗流槽装置,模拟天然均质介质承压含水层中的地下水渗流情况.采用NaCl作为示踪剂观察水的运移情况,利用控制变量的方法,在不同水力梯度下进行实验,对中砂均质介质承压水渗流中水流的流动情况进行研究.结果表明,在天然情况下,中砂均质介质中承压水非均匀流确实存在;随着实验水力梯度增加,渗流槽中的边界效应增加;在同一水力梯度下,每行观测孔的NaCl浓度峰值随着与NaCl溶液混合区的距离增加而减小,每列观测孔达到NaCl浓度峰值的时间随着与NaCl溶液混合区的距离增加逐渐增加;渗流槽边壁处NaCl浓度峰值大于渗流槽中间部分NaCl浓度峰值,渗流槽边壁处NaCl浓度峰值达到的时间小于渗流槽中间部分NaCl浓度峰值的时间;随着与NaCl溶液混合区的距离以及水力梯度的增加,这种渗流的不均匀性逐渐加大.
Experiments are carried out to study the seepage of groundwater in porous media.The seepage flow in the confined aquifer of natural homogeneous media is simulated by means of laboratory seepage channel device.Sodium chloride is used as a tracer to observe the movement of water,and the control variable is used to experiment under different hydraulic gradient.The flow of water flow in medium sand medium pressure water seepage flow is studied.The following conclusions are obtained:under natural conditions,the inhomogeneous flow of confined water in medium sand homogeneous medium is actual;with the increasing of hydraulic gradient in the experiment,the boundary effect in the seepage trough increases;the peak value of NaCl concentration per row of observed pores decreases with the increasing of the distance from the mixing zone of NaCl solution under the same hydraulic gradient.The time of measuring the peak of NaCl concentration increases with the increasing of the distance from the mixture of NaCl solution;the peak of NaCl concentration at the edge wall of the seepage trough is greater than the peak concentration of NaCl in the middle part of the seepage trough.The time of the peak value of NaCl concentration at the edge wall of the seepage trough is less than the time of the peak of the middle part of NaCl in the seepage trough;along with the solution with NaCl solution.With the increasing of the distance between the mixing zone and the hydraulic gradient,the inhomogeneity of the seepage gradually increases.
作者
李天宇
林山杉
胡正
高远
LI Tian-yu;LIN Shan-shan;HU Zheng;GAO Yuan(School of Environment,Northeast Normal University,Changchun 130117,Jilin,China)
出处
《西北师范大学学报（自然科学版）》
CAS
北大核心
2018年第5期107-114,共8页
Journal of Northwest Normal University(Natural Science)
基金
国家自然科学基金资助项目(41772236)
关键词
优势流
边壁效应
各向同性
多孔介质
达西定律
preferential flow
boundary effect
isotropic
porous media
Darcy s law
