›› 2017, Vol. 38 ›› Issue (1): 61-66.doi: 10.16285/j.rsm.2017.01.008

• 基础理论与实验研究 • 上一篇    下一篇

一种确定超固结弱透水层水力参数的方法

庄 超,周志芳,李兆峰,郭巧娜   

  1. 河海大学 地球科学与工程学院,江苏 南京 210098
  • 收稿日期:2015-01-02 出版日期:2017-01-11 发布日期:2018-06-05
  • 通讯作者: 周志芳,男,1962年生,博士,教授,主要从事水文地质和水文水资源等方面的研究工作。E-mail: zhouzf@hhu.edu.cn E-mail:zchao1990@hhu.edu.cn
  • 作者简介:庄超,男,1990年生,博士研究生,主要从事地下水资源方面的研究工作。
  • 基金资助:

    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);江苏省普通高校研究生创新训练计划项目 (No. KYZZ15_0149)。

A method for determining hydraulic parameters of an overconsolidated aquitard

ZHUANG Chao, ZHOU Zhi-fang, LI Zhao-feng, GUO Qiao-na   

  1. School of Earth Sciences and Engineering, Hohai University, Nanjing, Jiangsu 210098, China
  • Received:2015-01-02 Online:2017-01-11 Published:2018-06-05
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (41572209), the National Key Research and Development Program of China (2016YFC0402803) and the Research Innovation Program for College Graduates of Jiangsu Province (KYZZ15_0149).

摘要: 弱透水层是含水层系统的重要组成部分。弱透水层的渗透系数Kv和弹性贮水率值Sske对研究地面沉降及地下水资源评价具有重要的意义。在相邻含水层降深随时间周期性波动的条件下,推得了超固结弱透水层中无量纲形式的降深解析解,并基于该解析解进一步得到了超固结弱透水层累计变形量随时间变化的理论曲线。由于弱透水层的低渗透性,其变形总是滞后于相邻含水层的降深变化。根据弱透水层变形的滞后时间与含水层降深波动半周期的关系,提出了一种用以确定超固结弱透水层垂向渗透系数和弹性贮水率的方法,该方法对于弹性变形的超固结土具有很好的适用性。使用该方法之前,首先要根据分层标和水位资料确定含水层降深的变化周期以及弱透水层变形的滞后时间。应用该方法确定了上海地区f10-7分层标处第2弱透水层的水力参数为Kv=4.12×10-10 m/s,Sske =1.07×10-4 m-1。经实例计算结果具有一定的可靠性。

关键词: 超固结弱透水层, 垂向渗透系数, 弹性贮水率, 滞后变形

Abstract: Aquitard is an important part of the subsurface aquifer system. Hydraulic parameters of an aquitard, including the vertical hydraulic conductivity Kv and elastic specific storage Sske, are of great importance for the investigation of land subsidence and groundwater resources evaluation. An analytical solution for the flow in an overconsolidated aquitard is derived in dimensionless form under the condition of drawdown in adjacent aquifers fluctuating cyclically with time. The theoretical curve of cumulative deformation of the aquitard versus time is further derived in dimensionless form as well. Due to the low permeability of the aquitard, its deformation lags behind water level changes in adjacent aquifers. The relationship between the time delay in deformation and half cycle of aquifer drawdown is derived. Then a new method is proposed for estimating Kv and Sske. This method can be applied to an overconsolidated aquitard demonstrating elastic deformation. Before using the new method, the half cycle of cyclical aquifer drawdown and the time delay in aquitard deformation should be determined according to observed extensometer and hydrograph data. The new method is applied to obtain Kv and Sske of the second aquitard at the f10-7 extensometer site in Shanghai area. Field test results demonstrated that Kv and Sske are, respectively, 4.12×10-10 m/s and 1.07×10-4 m-1. The results are verified to be reliable.

Key words: overconsolidated aquitard, vertical hydraulic conductivity, elastic specific storage, time lag deformation

中图分类号: 

  • TV 223

[1] 叶淑君,薛禹群. 应用沉降和水位数据计算上海地区弱透水层的参数[J]. , 2005, 26(2): 256-260.
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