地下水监测工程承压-自流监测井密封技术

Sealing technology for confined-artesian monitoring wells in groundwater monitoring engineering

针对地下水监测工程施工中面临的承压-自流监测井密封、监测、取样、洗井等紧迫难题,研发了承压-自流监测井密封技术。该技术是在监测井管口安装一个具有多个功能组件的密封不锈钢盖板来实现自流监测井长期监测的各项需求。本文介绍了承压-自流监测井密封技术原理、系统组成和安装流程及方法。通过山西忻州市地下水监测井现场示范及其他地区50余口井的工程应用,证实该技术可有效解决自流监测井井口密封、水样采集、洗井清淤和维护探头等一系列问题,具有密封效果好、不污染水质、操作便捷和成本低等优点,可实现不同特征自流监测井地下水数据长期自动采集与传输,并可为类似井的封孔工作提供解决思路。

The sealing technology for confined⁃artesian monitoring wells is developed for urgent problems in drilling of groundwater monitoring wells,such as sealing,monitoring,sampling and well development.With the technology,a stainless steel sealing cover plate with multiple functional components is installed at the wellhead of the monitoring well to meet the requirements of the artesian monitoring well.This paper introduces the sealing technology principle,system composition,installation process and sealing method for the confined⁃artesian monitoring well.The field demonstration shows that the technology can effectively solve a series of problems,such as wellhead sealing,water sampling,well development,maintenance of probes;provide the advantages of good sealing effect,zero water pollution,convenient operation and low cost,and realize long⁃term automatic collection and transmission of groundwater data from artesian monitoring wells with different characteristics.It can provide a approach for the sealing work of similar wells.