中文摘要：

以泰斯公式为基础，提出了一种分析非稳定流抽水试验数据，确定含水层导水系数和弹性释水系数的新方法。不同于Jacob—Cooper直线图解法的简化方式，而是取泰斯井函数级数展开式的前三项作为井函数的近似表达式。以这样的简化方式而提出的改进直线解析法，在满足与Jacob—Cooper直线图解法相同计算精度的条件下，要求无量纲变量的值u〈0．2或u〈1．0。显然，这样的条件较Jacob—Cooper直线图解法要求的u〈0．01或u〈0．05更易得到满足。最后，通过实例说明了方法的具体步骤，并对方法的适用性进行了初步讨论。

英文摘要：

A new linear-analytical method of determining such hydrogeological parameters as transmissivity and releasing coefficient of aquifer from unsteady pumping test data is proposed based on Theis＇ equation for describing unsteady flow in a homogeneous , iso- tropic and infinite confined aquifer with constant pumping rate. Unlike the simplification way taken by Jacob-Cooper linear graphical method in order to derive the equations for estimation of aquifer parameters, the first three terms in expansion series of the Theis well functions are taken as simplified expresses of well function in the proposed method. With the same computation precision as one of the Jacob-Cooper linear graphical methods , the proposed method requires that the dimensionless time u meet the conditions of u〈0. 2 or u〈1. 0. It is evident that this condition is easier to be met than that of u〈0. 01 or u〈0. 05 required by Jacob-Cooper linear graphical method. Finally, an example is given to show the application procedure of the proposed method in detail and a discussion is conducted on the applicability of this method.