小口径反循环清淤设备集成系统研发及应用

Research and application of the integrated system for small-diameter reverse circulation dredging equipment

摘要:

在“十四五”期间，全国针对“双源”清单及地下水环境监测，布设了大量小口径PVC地下水监测井，以监测潜水层地下水水环境质量。地下水监测井的井底及内壁常因泥沙、杂质等沉积造成堵塞。本文聚焦小口径地下水监测井维护、清淤难题，设计研发了集成气举反循环清淤工艺的便携式装备，阐述了便携式清淤设备系统组成及工艺原理等。欧拉三相流简化模型的模拟分析以及针对不同深度监测井、不同类型淤积物的清淤效果统计数据表明，研发的设备系统对不同深度的监测井清淤效果显著，监测井的淤积速度与地下水中土颗粒的性质呈显性相关；数值模拟分析的预测结果与工程实践的实测数据整体趋势基本一致，实际工程效果优于预测结果。该设备集成系统解决了生态环境领域小口径地下水监测井维护、清淤难题，显著延长了监测井使用寿命，经济效益显著。

Abstract:

During the 14th Five-Year Plan period， a large number of small-diameter PVC groundwater monitoring wells have been deployed nationwide to monitor the environmental quality of groundwater in unconfined aquifers， as part of efforts targeting the "dual-source" inventory and groundwater environmental monitoring. The bottoms and inner walls of these groundwater monitoring wells often become clogged due to sediment and impurity deposition. This paper focuses on the challenges of maintaining and clearing silt in small-diameter groundwater monitoring wells. A portable equipment integrated with air lift reverse circulation dredging technology was designed and developed， and the system composition and technical principles of the portable dredging equipment were elaborated. Simulation analysis results based on a simplified Euler''s three-phase flow model and statistical data on the dredging effectiveness of the equipment system for monitoring wells of different depths and various types of sediment indicated that the developed system significantly improves dredging efficiency for wells of varying depths. The sedimentation rate in monitoring wells is significantly correlated with the properties of soil particles in the groundwater. The predicted outcomes from numerical simulations are generally consistent with the measured data from engineering practices in terms of overall trends， with actual engineering results outperforming the predictions. This integrated equipment system addresses the challenges of maintaining and dredging small-diameter groundwater monitoring wells in the ecological and environmental sector， significantly extends the service life of monitoring wells， and delivers notable economic benefits.