一种长期观测资料确定弱透水层参数的方法

发布时间：2018-03-10 21:42

本文选题：弱透水层　切入点：水力参数　出处：《岩土力学》2017年05期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Weak permeable layer is an important part of aquifer system. In order to accurately calculate the amount of water release and deformation of weakly permeable layer, the permeability coefficient and water storage rate of weakly permeable layer must be determined in advance. Based on the conceptual model of one-dimensional aquifer system, Under the boundary condition that the depth of adjacent aquifer increases linearly with time, a dimensionless analytical solution of the depth of weakly permeable layer is derived. In this paper, the law of lag depth dissipation in weak permeable layer is analyzed. According to the water balance equation, the standard curve of the variation of cumulative compression deformation with time in weak permeable layer is obtained, and a distribution method is proposed to determine the permeability coefficient and water storage rate of weak permeable layer. The distribution line method can reflect the hysteresis of the water release deformation process of weak permeable beds. Taking the Shanghai aquifer system as an example, The method of distribution line is used to determine the permeability coefficient of the second weak permeable layer at the stratified scale is 4.26 脳 10 ~ (-10) m / s, and the water storage rate is 2.22 脳 10 ~ (-4) m ~ (-1) ~ (-1). This method is applicable to aquifer systems with long series deformation and water level observation data.
【作者单位】：河海大学地球科学与工程学院;南京水利科学研究院水文水资源与水利工程科学国家重点实验室;
【基金】：国家自然科学基金资助项目(No.41572209) 国家重点研发计划项目(No.2016YFC0402803) 中央高校基本科研业务费专项资金资助项目(No.2017B40514)~~
【分类号】：P641.2

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