文章摘要
李 健,黄冠华,文 章,詹红兵.承压含水层中非达西径向稳定流动抽水模拟试验[J].水利学报,2012,43(1):
承压含水层中非达西径向稳定流动抽水模拟试验
A laboratory experiment on radial non-Darcian flow in confined aquifer under steady-state conditions
  
DOI：
中文关键词: 非达西流动  水头降深  抽水模拟试验  Izbash 方程
英文关键词: non-Darcian flow  drawdown  pumping test  Izbash equation
基金项目:
作者单位
李 健 中国农业大学水利与土木工程学院，北京 100083；农业部规划设计研究院，北京 100125； 中国- 以色列国际农业研究培训中心，北京 100083； 
黄冠华 中国农业大学水利与土木工程学院，北京 100083；中国- 以色列国际农业研究培训中心，北京 100083； 
文 章 中国地质大学环境学院，湖北武汉 430074； 
詹红兵 中国地质大学环境学院，湖北武汉 430074； 中国地质大学工程学院，湖北武汉 430074；德克萨斯农工大学 地质与地球物理系，美国 
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中文摘要:
      为分析抽水井附近水流的非达西流动，采用装填均质河砂的扇形密闭水槽模拟承压含水层，开展了外边界水头恒定条件下的定流量抽水试验，获得到了水流稳定流动时的水头降深曲线。通过比较试测水头降深与达西流动理论水头降深，以及比较相邻两压力传感器之间的平均水力梯度与相同流速下的达西水力梯度，进行了非达西流动的判别，比较结果发现本试验条件下存在明显的非达西流动现象。同时，应用基于Izbash 方程的非达西稳定流动水头降深解析解，对不同流量下的试验数据进行了拟合分析，发现抽水流量对非达西稳定流动的Izbash 方程系数值影响较小。通过不同平均方法获得了描述本试验中非达西流动的Izbash 方程系数的适宜取值为k=7.17×10-7，n=1.65，此时不同抽水流量下拟合水头降深曲线与试测水头降深曲线吻合良好，表明基于Izbash 方程的非达西稳定流动水头降深解析解可较好地描述抽水井附近的非达西径向稳定流动
英文摘要:
      In order to analyze the non-Darcian radial flow near the pumping well in confined aquifer ，a se ? ries of constant pumping tests were conducted in a converging permeameter of 60° under constant head at the inlet and outlet boundaries in laboratory. The tank was filled with river sand with diameter of 0.3~0.6mm to simulate the confined aquifer. Pressure transducers were installed in different distances along the radial direction ，and the measurement of the pressure head was used to obtain the steady state drawdown curves in different radial distances. Both the measured drawdown and the mean hydraulic gradient between two adjacent pressure transducers were used to identify the occu-rrence of non-Darcian flow. The results show that non-Darcian flow occurs in the test with different pumping rates. The analytical solution of non-Darcian steady state flow on the basis of the power function was used to fit the experimental drawdown data. The results show that the pumping rate has slight effect on the values of the coefficients of the Izbash equation. With the average coef-ficients values，i.e. the non-Darcian hydraulic conductivity k=7.17×10-7 and the power index n=1.65，the calculated drawdown match the measured data well for different pumping rates ，indicating that the analytical solution is capable of describing the radial non-Darcian flow.
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