回灌与回扬物理过程的解析推导及灌压变化规律

以回灌过程中渗透系数衰减模型为基础，推导了不同回扬次数的渗透系数解析表达式；将其应用于Theis公式，获得了考虑渗透系数衰减以及暂时性堵塞率条件下回灌与回扬物理过程中含水层压强的解析表达式，更准确地刻画了回灌与回扬的物理机制。计算结果表明：在连续回灌不回扬过程中，井内灌压增长符合指数曲线特征，而采取回扬措施后，由指数连续上升转变为间断式阶梯上升；回扬次数越多，灌压下降越明显，但灌压变化幅度随回扬次数的递增而减小。根据解析解定义的两种堵塞率的结果，可以实现利用实验判断不同成分回灌水源对含水层堵塞机理的分析，从而达到科学制定回灌水源标准的目的。

Analytical Derivation on Recharge and Periodic Backwashing Process and the Variation of Recharge Pressure

Based on attenuation model of hydraulic conductivity during the artificial recharge,the hydraulic conductivity analytic expression was derived.The aquifer pressure analytical expression in recharge and periodic backwashing physical processes with consideration of attenuation of hydraulic conductivity and temporary clogging rate,by application of hydraulic conductivity analytic expression on Theis formula.The physical mechanism of recharge and periodic backwashing can be more accurately described.The calculation results show that the wells recharge pressure growth in line with exponential curves in a continuous process of recharge without periodic backwashing,but the wells recharge pressure growth from the continuous rise in the index converted into intermittent stepped up with periodic backwashing.The more times periodic backwashing,more obvious recharge pressure decreased.But, with the increasing number of periodic backwashing,variation magnitude of recharge pressure is decreased.Based on the result of two blocking rate of analytical solution,the clogging mechanism in different components of the recharge water can be analyzed by using the experiments,which can guide to determine the standards of the recharge water sources.