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    解析法与数值法在水电站防渗墙效果评价中的运用

    陈晓恋 文章 胡金山 闵勇章 梁杏 孙蓉琳 李润超

    陈晓恋, 文章, 胡金山, 闵勇章, 梁杏, 孙蓉琳, 李润超, 2016. 解析法与数值法在水电站防渗墙效果评价中的运用. 地球科学, 41(4): 701-710. doi: 10.3799/dqkx.2016.059
    引用本文: 陈晓恋, 文章, 胡金山, 闵勇章, 梁杏, 孙蓉琳, 李润超, 2016. 解析法与数值法在水电站防渗墙效果评价中的运用. 地球科学, 41(4): 701-710. doi: 10.3799/dqkx.2016.059
    Chen Xiaolian, Wen Zhang, Hu Jinshan, Min Yongzhang, Liang Xing, Sun Ronglin, Li Runchao, 2016. Application of Numerical Simulation and Analytical Methods to Estimate Hydraulic Parameters of Foundation Pit in Hydropower Stations. Earth Science, 41(4): 701-710. doi: 10.3799/dqkx.2016.059
    Citation: Chen Xiaolian, Wen Zhang, Hu Jinshan, Min Yongzhang, Liang Xing, Sun Ronglin, Li Runchao, 2016. Application of Numerical Simulation and Analytical Methods to Estimate Hydraulic Parameters of Foundation Pit in Hydropower Stations. Earth Science, 41(4): 701-710. doi: 10.3799/dqkx.2016.059

    解析法与数值法在水电站防渗墙效果评价中的运用

    doi: 10.3799/dqkx.2016.059
    基金项目: 

    国家自然科学基金项目 41372253

    中央高校基本科研业务费专项基金项目 CUG140503

    详细信息
      作者简介:

      陈晓恋(1989-),女,硕士研究生,主要从事地下水数值模拟工作.E-mail:chenxiaolian105@126.com

      通讯作者:

      文章,E-mail:wenz@cug.edu.cn

    • 中图分类号: P64

    Application of Numerical Simulation and Analytical Methods to Estimate Hydraulic Parameters of Foundation Pit in Hydropower Stations

    • 摘要: 四川省大渡河上某水电站目前正处于施工阶段,大坝基坑防渗墙已基本完成施工,但基坑涌水量较大,为评价防渗墙的防渗效果,在两防渗墙间开展了2组抽水试验.根据研究区边界条件,利用综合井函数法初步求取了基坑砂砾层的水文地质参数,并在此基础上采用数值法(groundwater modeling system, GMS)建立水流模型,进行参数的识别、验证,研究表明综合井函数法得到的砂砾含水层渗透系数为19.13~32.24 m/d,GMS拟合得到的渗透系数为26.00 m/d.此外,数值模拟拟合得到的主、副防渗墙渗透系数较小(0.01~0.02 m/d),说明两防渗墙防渗效果较好.

       

    • 图  1  研究区平面图

      Fig.  1.  The plan view of the study area

      图  2  研究区示意

      Fig.  2.  The schematic of the study area

      图  3  第1次抽水试验抽水井映射结果

      Fig.  3.  The mapping results for the imaginary pumping wells of the first pumping test

      图  4  第1次抽水试验#5观测井曲线匹配

      Fig.  4.  Fitting curve for the observation well #5 in first pumping test

      图  5  第1次抽水试验#7观测井曲线匹配

      Fig.  5.  Fitting curve for the observation well #7 in first pumping test

      图  6  第2次抽水试验抽水井映射结果

      Fig.  6.  The mapping results for the imaginary pumping wells of the second pumping test

      图  7  水电站基坑施工期三维模型

      Fig.  7.  The three-dimensional model for foundation pit of hydropower station during construction

      图  8  沿大渡河流向剖面

      Fig.  8.  A sectional view along the Dadu river

      图  9  数值模型边界示意

      Fig.  9.  The schematic diagram of the boundaries for the mathematical model

      图  10  基坑网格剖分

      Fig.  10.  The picture of mesh discretization in foundation pit of hydropower station

      图  11  各层分区

      Fig.  11.  The partition for each layer

      图  12  水位观测值与计算值拟合曲线

      Fig.  12.  Fitting curve for the hydraulic heads in the observation wells

      图  13  水位观测值与计算值拟合曲线

      Fig.  13.  Fitting curve for the hydraulic heads in the observation wells

      图  14  水位观测值与计算值拟合曲线

      Fig.  14.  Fitting curve for the hydraulic heads in the observation wells

      图  15  水位观测值与计算值拟合曲线

      Fig.  15.  Fitting curve for the hydraulic heads in the observation wells

      表  1  抽水试验基本情况

      Table  1.   The information of the pumping test

      抽水次序 抽水井 观测井 抽水时间 抽水流量(m3/h)
      1 #6 #3,#5,#6,#7 2013-06-28T11:09—2013-06-28T17:30 23.10
      2 #5 #2,#4,#5,#6,#7,#10 2013-07-04T15:00—2013-07-04T16:43 4.63
      2013-07-05T08:56—2013-07-05T20:17 24.11
      2013-07-05T20:18—2013-07-06T10:26 4.63
      下载: 导出CSV

      表  2  解析法求参结果(砂砾层)

      Table  2.   The results of hydrogeological parameters obtained by analytical method (sandy gravel layer)

      特定条件标准曲线对比法
      试验次序 观测井 T(m2/d) a(m2/d) K(m/d) ue
      第1次抽水试验 5号观测井 573.82 3.50×105 19.13 1.64×10-3
      7号观测井 662.10 3.76×105 22.07 1.76×10-3
      第2次抽水试验 6号观测井 944.44 4.28×105 31.48 2.21×10-3
      7号观测井 967.47 5.14×105 32.24 1.88×10-3
      下载: 导出CSV

      表  3  分区说明

      Table  3.   The description for the partition

      层数 厚度(m) 分区说明
      Ⅰ区 Ⅱ区 Ⅲ区
      第1层 5 混凝土灌浆 上游副防渗墙(混凝土防渗墙) 下游主防渗墙(混凝土防渗墙)
      第2层 10~55 覆盖层(砂砾层) 上游副防渗墙(混凝土防渗墙) 下游主防渗墙(混凝土防渗墙)
      第3层 10~12 弱风化带 上游副防渗墙(帷幕灌浆) \
      第4层 20~30 基岩带 上游副防渗墙(帷幕灌浆) \
      下载: 导出CSV

      表  4  各岩层参数

      Table  4.   The parameters for each layer

      层数 渗透系数(m/d) 给水度 弹性给水度(ue)
      Ⅰ区 Ⅱ区 Ⅲ区 Ⅰ区 Ⅱ区 Ⅲ区 Ⅰ区 Ⅱ区 Ⅲ区
      第1层 0.01 0.011 0.023 0.01 0.04 0.04 \ \ \
      第2层 26.00 0.011 0.023 \ \ \ 0.006 3 0.003 0 0.003 0
      第3层 0.50 0.040 \ \ \ \ 0.040 0 0.004 0 \
      第4层 0.01 0.008 \ \ \ \ 0.002 5 0.001 0 \
      下载: 导出CSV
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    • 收稿日期:  2015-05-09
    • 刊出日期:  2016-04-15

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