减压井灌淤机理的物理化学试验研究

Physical - mechanism of clogging of relief wells

本文以荆江大堤观音寺堤段减压井为研究对象，应用物理化学理论和试验方法，对减压井灌淤的物质来源，灌淤形成机理和防治进行了初步试验研究．试验结果表明：在一定水文地质环境中，化学灌淤是造成减压井效能降低或失效的主要原因，铁锰等的还原→络合→氧化→胶凝→沉淀→吸附→老化→堵塞是化学灌淤的物理化学过程．当在减压井两端外加一定电压而改变减压井周围氧化还原环境时，将有利于抑制和改善减压井灌淤的发生和发展．

Physical and chemical analyses have been done on the clogging material taken from the wall of relief wells in the Guanyinsi Section of Jingjiang Dike for investigating its origin. mechanism of formation as well as preventive measures of clogging. Test results have shown that the chemical siltation is the main cause to reduce the efficiency of relief wells. The process of chemical siltation is reduction of iron and manganese→complexing→ oxidation→ gelation→ sedimentation→ adsorption→ ageing→jaming. If a certain voltage is applied to the two extremes of the well, changing the environment of reduction and oxidation, the chemical clogging will be significantly reduced.