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    不同饱和黏性土渗透系数预测方法的应用与对比:以苏北沿海平原黏土为例

    葛勤 梁杏 龚绪龙 刘彦

    葛勤, 梁杏, 龚绪龙, 刘彦, 2017. 不同饱和黏性土渗透系数预测方法的应用与对比:以苏北沿海平原黏土为例. 地球科学, 42(5): 793-803. doi: 10.3799/dqkx.2017.067
    引用本文: 葛勤, 梁杏, 龚绪龙, 刘彦, 2017. 不同饱和黏性土渗透系数预测方法的应用与对比:以苏北沿海平原黏土为例. 地球科学, 42(5): 793-803. doi: 10.3799/dqkx.2017.067
    Ge Qin, Liang Xing, Gong Xulong, Liu Yan, 2017. Application and Comparison of Various Methods for Determining Hydraulic Conductivity in Saturated Clay-Rich Deposits—A Case Study of Clay-Rich Sediments in North Jiangsu Coastal Plain. Earth Science, 42(5): 793-803. doi: 10.3799/dqkx.2017.067
    Citation: Ge Qin, Liang Xing, Gong Xulong, Liu Yan, 2017. Application and Comparison of Various Methods for Determining Hydraulic Conductivity in Saturated Clay-Rich Deposits—A Case Study of Clay-Rich Sediments in North Jiangsu Coastal Plain. Earth Science, 42(5): 793-803. doi: 10.3799/dqkx.2017.067

    不同饱和黏性土渗透系数预测方法的应用与对比:以苏北沿海平原黏土为例

    doi: 10.3799/dqkx.2017.067
    基金项目: 

    国家自然科学基金项目 41272258

    国土资源部地裂缝地质灾害重点实验室开放基金项目 EFGD2013007

    详细信息
      作者简介:

      葛勤(1990-),女,博士研究生,主要从事低渗透水文地球化学的研究.ORCID:0000-0001-5509-3900.E-mail: geqin90827@126.com

      通讯作者:

      龚绪龙,ORCID:0000-0003-4231-9995.E-mail: xulonggong@126.com

    • 中图分类号: P641

    Application and Comparison of Various Methods for Determining Hydraulic Conductivity in Saturated Clay-Rich Deposits—A Case Study of Clay-Rich Sediments in North Jiangsu Coastal Plain

    • 摘要: 渗透系数(K)是水文地质、岩土工程领域的重要参数,而低渗透介质的结构较为复杂,在实际应用中,场地的尺度、介质的扰动程度等均会对K的确定产生影响.利用δ18O化学示踪法、室内试验及经验公式法估算饱和黏性土的垂向渗透系数,并对比分析不同预测方法的适用性.以苏北沿海平原第四纪厚层黏土为例,δ18O化学示踪法预测厚层黏性土的渗透系数低于10-11 m/s,室内法测得渗透系数为2.61×10-8~9×10-12 m/s,经验法预测值较大,是室内法的几倍到几十倍.δ18O化学示踪法是表征天然条件下长时间的实验结果,除了反映数十米厚层黏性土的等效渗透性能,还可预测黏土孔隙水的渗流时间;结合测定黏土样品液塑限等室内实验参数,室内实验和经验公式法可以提供系列剖面黏土的渗透系数,更清晰地说明厚层黏土剖面不同渗透系数预测方法的差异性.

       

    • 图  1  饱和低渗透介质K测定示意

      Fig.  1.  Device of measuring saturated clay hydraulic conductivity

      图  2  SY1孔钻孔位置

      1.河流;2.地下水流向;3.省界;4.地下水TDS等值线;5.断裂;6.现代海岸线;7.东岗海岸线

      Fig.  2.  Location of SY1 core at North Jiangsu coastal plain

      图  3  黏性土孔隙水Cl-、Br-δ18O垂向分布

      Fig.  3.  The vertical distribution of Cl-, Br-, δ18O values of porewater in SY1 clay-rich sediments

      图  4  0~26.4 m孔隙水δ18O实测值与化学示踪模拟值的对比

      a.曲线代表纯扩散条件下,不同模拟时间对应的理论曲线;b.1 000 a运移条件下,曲线代表不同渗透系数对应的理论模拟曲线

      Fig.  4.  Comparison between the measured δ18O values and the simulations of tracer profiles in the depth of 0 to 26.4 m

      图  5  26.4~65.0 m孔隙水δ18O实测值与化学示踪模拟值的对比

      a.曲线代表纯扩散条件下,不同模拟时间对应的理论曲线;b, c.3 000 a和6 000 a运移条件下,曲线代表不同渗透系数对应的理论模拟曲线

      Fig.  5.  Comparison between the measured δ18O values and the simulations of tracer profiles in the depth of 26.4 to 65.0 m

      图  6  不同方法预测的K随深度的分布

      Fig.  6.  The determined hydraulic conductivities of SY1 core in different depths using three predicted methods

      表  1  苏北原状黏性土物理指标

      Table  1.   Parameters of undisturbed clay-rich deposits in North Jiangsu

      深度(m)液限(%)塑限(%)<3.9 μm
      粘粒(%)
      3.9~62.3μm
      粉粒(%)
      实测K
      (m/s)
      经验公式K
      (m/s)
      经验公式K/
      实测K
      孔隙度孔隙比相对密度
      5.76~5.8630.4418.6614.1377.902.61×10-88.36×10-100.030.380.602.07
      14.82~15.0235.5621.6322.6474.524.52×10-102.82×10-97.990.531.131.79
      89.00~89.20--20.0662.871.40×10-11--0.400.672.14
      95.60~95.80--31.7068.307.30×10-10--0.430.742.03
      121.40~121.6055.5826.5129.7855.561.09×10-112.57×10-1023.680.430.772.07
      142.20~142.4053.6328.1528.9960.559.04×10-122.38×10-1026.300.380.752.19
      172.20~172.4034.7919.9214.3938.861.42×10-104.75×10-103.350.380.622.08
      202.20~202.4046.1922.6539.7360.242.86×10-102.93×10-101.020.400.682.09
      218.00~218.2047.8622.8829.4648.451.50×10-112.05×10-1011.320.380.622.09
      245.20~245.4046.0722.5929.0056.603.70×10-113.37×10-109.040.410.702.02
      注:“-”代表未测定.
      下载: 导出CSV

      表  2  室内实验测定苏北原状黏土试样K(10-10 m/s)

      Table  2.   The laboratory-measured K of undisturbed samples in North Jiangsu

      5.76~5.78 m14.82~15.02 m89.0~89.2 m95.6~95.8 m121.4~121.6 m142.2~142.4 m172.2~172.4 m202.2~202.4 m218.0~218.2 m245.2~245.4 m
      水力梯度实测值K均值K水力梯度实测值K均值K水力梯度实测值K均值K水力梯度实测值K均值K水力梯度实测值K均值K水力梯度实测值K均值K水力梯度实测值K均值K水力梯度实测值K均值K水力梯度实测值K均值K水力梯度实测值K均值K
      0.2310260.743.74.574.5291.90.130.1441.97.687.3092.00.120.1148.80.040.0976.32.581.4276.32.792.8675.30.170.1574.60.350.37
      0.2268260.743.74.504.5291.90.150.1441.97.567.3092.00.090.1146.20.120.0978.61.121.4278.62.462.8675.30.170.1574.60.360.37
      0.2244260.747.04.044.5291.90.150.1441.97.527.3092.00.150.1153.70.140.0976.31.271.4274.42.322.8675.30.140.1577.90.390.37
      0.2199260.747.04.134.5291.90.150.1455.36.957.3092.00.100.1162.10.060.0976.31.121.4267.73.742.8675.30.150.1569.60.490.37
      0.2250260.754.54.514.5286.90.140.1455.36.997.3087.00.100.1162.10.130.0976.30.981.4276.23.002.8675.30.150.1578.20.260.37
      0.2293260.754.55.364.5286.90.140.1461.97.107.3087.00.100.11--------75.30.11----
      注:表示“-”无测值.
      下载: 导出CSV
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    • 收稿日期:  2016-12-17
    • 刊出日期:  2017-05-15

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