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承压含水层抽水井降落漏斗反映了含水层的水文性质,如渗透系数和弹性释水系数等水文地质参数,降落漏斗形状和体积具有重要工程应用价值。根据Theis井流函数,在无越流承压含水层抽水试验后期,s-lgr和s-lgt半对数坐标曲线都呈现直线关系,该特征常用于计算水文地质参数和影响半径。应用积分方法,分别以降深和井距作为积分变量,推导了无越流承压含水层单个抽水井降落漏斗体积,并与精确值对比分析,阐明了常规用s-lgr直线延长线所得影响半径内降落漏斗体积占完整降落漏斗体积的比例及差异所在。
The confined aquifer drawdown funnel reflects the hydrological properties of aquifers, such as hydraulic parameters such as permeability coefficient and elastic release coefficient. The shape and volume of the descending funnel have important engineering application value. According to Theis well-flow function, the semi-logarithmic curves of s-lgr and s-lgt show a linear relationship in the late pumping test of unconstrained aquifer, which is commonly used to calculate hydrogeological parameters and influence radius. Using the integral method, taking the depth and well spacing as the integral variables respectively, the volume of the dropping funnel in a single pumping well with no-flow confined aquifer was deduced and contrasted with the exact value. The influence radius of the conventional s-lgr linear extension line The ratio of the volume of the internal dropping funnel to the volume of the complete falling funnel is the difference.