【摘要】 理论与试验表明,在潜水位下降时土层释水有一定的滞后作用。自井孔大于1—2m的水井抽水时,抽水初期井筒蓄水对水位降深的影响不容忽视。当抽水流量很小时,半径不足1m的井筒,也有一定的蓄水作用,同样也值得考虑。本文在布尔顿(Boulton)延迟给水经验表达式的基础上推导了有井孔蓄水的潜水井非稳定流公式。求得了适用于任一时间的拉氏变换解和适用于初期和后期的近似解析解。给出了水井降深函数的典型理论曲线,并对影响因素进行了讨论。更多还原

【Abstract】 Theoretical and experimental studies show that under the condition of falling water table there exists the delayed gravity response in unconfined aquifers. When water is extracted from large-diameter wells, the influence of the well hole storage on drawdown of water table is considerable. In this paper equations considering both the storage of well hole and the delayed gravity response of soil are derived. The Laplace transform solutions valid for the complete time domain and approximate analytical solutions for early-time and late-time are obtained. Typical curves of well functions for typical parameters are given. With the help of typical curves the effects of well hole storage, the storativity ratio η, the retardation factor B and the index of the delayed gravity response are illustrated.更多还原