地下水循环井V1.0场地应用效果分析

The application effect of an in-situ groundwater circulation well(V1.0)

地下水循环井作为一种原位修复技术,因其对含水层扰动小、结构简单、修复成本较低等优点,逐渐成为修复污染含水层的重要手段。但我国目前尚缺乏循环井技术实际运行实例。以数值模拟为指导,基于模拟结果设计了循环井V1.0系统,建设了循环井系统,并通过野外现场试验对循环井的水流循环特征及溶质运移效果进行了评估。研究表明,溶质运移范围与循环井运行时间及循环井的抽注量呈正相关关系,同时水流及溶质运移范围也受到水平渗透系数与垂直渗透系数的影响。循环井的抽注量越大,上筛段水位下降及下筛段水位上升的幅度越大。使用高锰酸钾作为示踪剂时,随着循环井运行时间的增加,示踪剂能够以较高浓度被输送到更远的地方。

As one of the in-situ remediation technologies,groundwater circulation well has becoming a vital solution for contaminated aquifers remediation due to its advantages of small disturbance to aquifers,simple structure and low repair cost.However,large engineering applications of circulating well technology is still lacking in China.Based on the numerical simulation,the circulating well V1.0 system was designed in this study and constructed based on the simulation results.The system was constructed in Chang’an University,and the flow circulation characteristics and solute transport effect of the circulating well were evaluated through a variety of field tests.Results showed that the solute transport range was positively correlated with the running time of the circulating well and the pumping amount of the circulating well.Meanwhile,the water flow and solute transport range were also affected by the horizontal permeability coefficient and the vertical permeability coefficient.The greater the pumping amount of the circulating well,the greater the water level drop of the upper screen section and the water level rise of the lower screen section.While potassium permanganate was used as the tracer,with the extension of the running time of the circulating well,it can be transported to a longer distance in a high concentration form.This study could provide a scientific guidance for engineering applications of circulating well system in China.