Volume of depression cone of pumping wells in non-leaky confined aquifer
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摘要: 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。Abstract: The depression cone of pumping wells reflects the hydrogeological conditions of aquifer, such as hydraulic parameters and elastic storage of confined aquifer. The geometrical shape and volume of depression cone has important application value. According to the Theis equation, during the late period of pumping tests on non-leaky confined aquifer, the relationship between drawdown and distance is a straight line in s-lgrfigure, and that between drawdown and time shows a straight line in s-lgtfigure. These characteristics are often used to calculate hydrogeological parameters and influence radius. Applying the integration method, the volume of depression cone of pumping well in non-leaky confined aquifer is derived by regarding the drawdown and distance as integration variables. A contrast to the exact solution shows that the depression cone within the influence radius calculated by means of the straight line of s-lgris proportional to the entire drawdown cone. The difference between the above two depression cones is pointed out.
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Keywords:
- volume /
- depression cone /
- confined aquifer /
- non-leakage
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