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    江汉平原第四系弱透水层渗透系数求算方法

    张婧玮 梁杏 葛勤 李惠 朱波

    张婧玮, 梁杏, 葛勤, 李惠, 朱波, 2017. 江汉平原第四系弱透水层渗透系数求算方法. 地球科学, 42(5): 761-770. doi: 10.3799/dqkx.2017.064
    引用本文: 张婧玮, 梁杏, 葛勤, 李惠, 朱波, 2017. 江汉平原第四系弱透水层渗透系数求算方法. 地球科学, 42(5): 761-770. doi: 10.3799/dqkx.2017.064
    Zhang Jingwei, Liang Xing, Ge Qin, Li Hui, Zhu Bo, 2017. Calculation Method about Hydraulic Conductivity of Quaternary Aquitard in Jianghan Plain. Earth Science, 42(5): 761-770. doi: 10.3799/dqkx.2017.064
    Citation: Zhang Jingwei, Liang Xing, Ge Qin, Li Hui, Zhu Bo, 2017. Calculation Method about Hydraulic Conductivity of Quaternary Aquitard in Jianghan Plain. Earth Science, 42(5): 761-770. doi: 10.3799/dqkx.2017.064

    江汉平原第四系弱透水层渗透系数求算方法

    doi: 10.3799/dqkx.2017.064
    基金项目: 

    国家自然科学基金项目 41272258

    中国地质调查局项目 12120114069301

    中国地质调查局项目 DD20160255

    详细信息
      作者简介:

      张婧玮(1992-),女,硕士,主要从事水文-环境地质方面的研究工作.ORCID:0000-0002-3051-944X.E-mail:zjw273724004@163.com

      通讯作者:

      梁杏,ORCID:0000-0001-9838-5161.E-mail:xliang@cug.edu.cn

    • 中图分类号: P641

    Calculation Method about Hydraulic Conductivity of Quaternary Aquitard in Jianghan Plain

    • 摘要: 弱透水层的渗透系数是区域地下水流系统划分和关键带水-土-生作用的重要参数.结合江汉平原关键带调查采集1:5万杨林尾-陆溪口图幅钻孔52组不同深度、不同岩性的原状土样,利用改进的渗透仪进行室内渗透实验,对粘性土样的渗透系数和粒度特征参数进行经验公式修正.发现研究区沉积物渗透系数与含水岩组埋深和岩性有关.浅层孔隙潜水含水岩组以粉质粘土、粘土为主,沉积环境稳定,渗透系数约10-9 m/s,变异系数为1.56;中深层承压含水岩组夹有多层粘土和粉砂,呈现多旋回分布的典型河湖交互作用的沉积环境,渗透系数为10-10~10-6 m/s,变异系数为2.04,变异性较大.利用有效孔隙比eu与黏粒含量P的显著二项式关系,修正预测粘性土渗透系数的太沙基经验公式,预测值与室内实测数据基本吻合,二者比值均小于10,验证了太沙基修正公式在河湖相平原区的适用性.

       

    • 图  1  研究区位置和钻孔分布

      Fig.  1.  Location and boreholes distribution of the study area in the Jianghan plain

      图  2  研究区A-A′水文地质剖面

      Fig.  2.  Geological profile along line A-A′ of Quaternary aquifers the study area

      图  3  改进的饱和低渗透介质渗透系数测定装置

      葛勤等(2015)

      Fig.  3.  Device of measuring saturated clay hydraulic conductivity

      图  4  研究区渗透系数的空间分布

      Fig.  4.  Spatial distribution of hydraulic conductivity in study area

      图  5  公式修正与预测的粘性土样品粒度成分

      a.修正公式的土样粒度成分;b.预测的土样粒度成分

      Fig.  5.  The granularity composition of clay for amendment and prediction of formula

      图  6  euP的拟合关系

      Fig.  6.  The fitting relationship diagram of eu and P

      图  7  研究区渗透系数划分概念模式

      Fig.  7.  Conceptual schema of the partition of hydraulic conductivity in study area

      表  1  渗透系数(m/s)数据统计结果

      Table  1.   Statistical results of the measured hydraulic conductivity (m/s)

      钻孔编号YLW01YLW04
      样品数2119
      最大值6.60×10-62.24×10-6
      最小值2.47×10-101.41×10-10
      均值5.79×10-72.56×10-7
      标准差1.53×10-65.95×10-7
      变异系数2.642.32
      下载: 导出CSV

      表  2  修正公式的土样参数

      Table  2.   The formula parameters of clay

      样品编号K(10-9 m/s)ed10(10-3 mm)eu黏粒含量P(%)
      Y01-11.271.491.740.1425.34
      Y01-21.151.101.280.1925.12
      Y01-31.540.791.880.1522.74
      Y01-41.210.932.171.1351.19
      Y01-51.740.965.350.5539.00
      Y01-130.540.981.640.1022.32
      Y01-159.171.033.700.1822.42
      Y01-170.520.892.670.0617.17
      Y01-193.100.914.600.0914.21
      Y01-210.590.944.840.0417.08
      Y01-240.350.764.830.038.94
      L02-36.820.923.120.1924.89
      L02-1-10.131.213.210.0320.28
      L02-1-23.710.811.940.2230.03
      L02-1-32.020.903.740.0916.45
      L02-1-50.410.965.300.039.44
      下载: 导出CSV

      表  3  修正公式的验证结果

      Table  3.   The verification result of amendment formula

      样品编号P(%)d10(10-3 mm)K实测(10-9 m/s)K预测(10-9 m/s)K预测/K实测相对误差
      Y04-127.101.580.352.126.065.06
      Y04-237.301.301.368.386.165.16
      Y04-328.831.370.822.252.761.76
      Y04-435.561.293.466.311.820.82
      Y04-528.581.453.172.390.75-0.25
      Y04-1327.951.321.131.761.560.56
      JH01-6912.591.820.280.110.39-0.61
      JH01-728.842.470.360.250.69-0.31
      JH01-7310.732.010.060.132.171.17
      JH04-2233.471.355.105.000.98-0.02
      JH08-0122.921.746.770.990.15-0.85
      JH10-1724.491.671.681.330.79-0.21
      JH10-2331.451.380.583.696.365.36
      JH10-6925.271.640.571.532.671.67
      下载: 导出CSV
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