A study of the well-forming technology of a cluster monitoring well

With the intensification of human economic and social activities, the scope and intensity of groundwater pollution (especially the risk of shallow groundwater pollution) are increasing. It is urgent to develop simple, effective and reliable monitoring wells for detecting and evaluating the pollution degree of shallow groundwater in time. The traditional single-well, single-layer and shallow groundwater stratified monitoring wells have many problems, such as too much land occupied and few monitoring layers achieved. Nested monitoring wells are usually used to monitor 5 layers. Moreover, the diameter of the continuous multi-channel monitoring wells is too small, therefore, it is necessary to study the monitoring instruments occupying small area can monitor the multiple layer, and to design the well tube diameter to meet the installation requirements. Therefore, based on the principles of introduction, digestion and re-innovation, this paper mainly studies the method of stopping water in the course of construction of cluster shallow groundwater layered monitoring well through indoor and field tests, water sealing material-clay ball composition, particle size and compression test, water sealing layer thickness and water sealing effect test, down pipe method and other key procedures, to achieve the monitoring of the same hole within 100 m of the multi-layer aquifer or multi-layer aquifer monitoring. Moreover, the construction caliber is small and takes up less land, and the construction cost is more economical. Cluster monitoring wells can be used in many fields such as groundwater monitoring, environmental pollution investigation and research. The research will provide theoretical basis and technical support for the construction of cluster shallow groundwater stratified monitoring wells. It will make the future monitoring more precise and accurate, and provide a new idea and research direction for the development of our country's monitoring wells in the future.