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弱透水层是含水层系统的重要组成部分,要准确计算弱透水层释水量和变形量需事先确定弱透水层的渗透系数和贮水率值。基于一维含水层系统概念模型,在相邻含水层降深随时间线性增大的边界条件下,推得了无量纲形式的弱透水层降深解析解,分析了弱透水层中滞后降深消散规律。根据水量均衡方程得到了弱透水层累计压缩变形量随时间变化的标准曲线,并提出了一种配线法用以确定弱透水层的渗透系数和贮水率,该配线法能够反映弱透水层释水变形过程的滞后性。以上海含水层系统为例,运用配线法确定了f_(10-7)分层标处第2弱透水层的渗透系数为4.26×10~(-10)m/s,贮水率为2.22×10~(-4)m~(-1)。对于具有长序列变形和水位观测资料的含水层系统,该方法具有一定的适用性。
The aquitard is an important part of the aquifer system. To accurately calculate the water release and deformation of the aquitard, the permeability coefficient and water storage rate of the aquitard must be determined in advance. Based on the conceptual model of a one-dimensional aquifer system, an analytic solution to the deformation of a weak aquitard in the form of a non-dimensional aquifer is deduced under the boundary condition that the depth of the adjacent aquifer decreases linearly with time. law. According to the water balance equation, the standard curve of cumulative compressive deformation of the aquitard over time is obtained, and a wiring method is proposed to determine the permeability coefficient and water storage rate of the aquitard. The wiring method can reflect the weak pervious Hysteresis in the process of water release and deformation. Taking Shanghai aquifer system as an example, the permeability coefficient of the second aquitard at f_ (10-7) is 4.26 × 10 ~ (-10) m / s and the water storage rate is 2.22 × 10 ~ (-4) m ~ (-1). This method has some applicability to aquifer system with long sequence deformation and water level observation data.