硬岩水文地质参数井同径止水与分层抽水试验研究

董崇泽, 孙智杰. 硬岩水文地质参数井同径止水与分层抽水试验研究[J]. 水文地质工程地质, 2022, 49(4): 55-61. doi: 10.16030/j.cnki.issn.1000-3665.202204012
引用本文: 董崇泽, 孙智杰. 硬岩水文地质参数井同径止水与分层抽水试验研究[J]. 水文地质工程地质, 2022, 49(4): 55-61. doi: 10.16030/j.cnki.issn.1000-3665.202204012
DONG Chongze, SUN Zhijie. Experimental investigation on same diameter sealing and stratified pumping of hard rock hydrogeological parameter well[J]. Hydrogeology & Engineering Geology, 2022, 49(4): 55-61. doi: 10.16030/j.cnki.issn.1000-3665.202204012
Citation: DONG Chongze, SUN Zhijie. Experimental investigation on same diameter sealing and stratified pumping of hard rock hydrogeological parameter well[J]. Hydrogeology & Engineering Geology, 2022, 49(4): 55-61. doi: 10.16030/j.cnki.issn.1000-3665.202204012

硬岩水文地质参数井同径止水与分层抽水试验研究

  • 基金项目: 山西省政府购买科技创新项目(晋地水发 [2021]10号)
详细信息
    作者简介: 董崇泽(1968-),男,副教授,主要从事地质工程、岩土工程、矿业工程等方面教学与研究工作。E-mail:dchz@163.com
    通讯作者: 孙智杰(1959-),男,教授级高工,主要从事岩土工程技术研究与管理工作。E-mail:2668720192@qq.com
  • 中图分类号: P642.1

Experimental investigation on same diameter sealing and stratified pumping of hard rock hydrogeological parameter well

More Information
  • 针对传统施工程序无法解决坚硬岩石止水环隙很小(仅3 mm)钻孔的同径止水及分层抽水试验问题,以山西某水文地质参数井为研究对象,采用现场和室内综合试验的方法,对同径止水方案、材料、技术、分层抽水等工艺进行研究。结果表明:(1) 同径止水装置经过特殊的“外掏内缩”设计与制作,使止水外环间隙由3 mm增大到8.5 mm,解决了“极小止水环隙”下的同径止水问题;经抽水检验,止水效果良好。(2) 在孔外一系列试验的基础上,定制的止水材料和选择的止水组合与本孔的适应性强,下管风险小,实施过程相当顺利。(3)专门设计的分层导水管路,其上串接的隔离封水胶球与止水套管柱内设置的锥形隔水接头相互契合,封水可靠,形成了两套独立的导水管路,满足了上、下含水层分层抽水试验的工况。研究结果可为类似水文地质参数井开展同径止水或分层抽水试验研究提供参考。

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  • 图 1  3种止水方案示意图

    Figure 1. 

    图 2  吸水膨胀胶粒浸泡颗粒膨胀情况

    Figure 2. 

    图 3  特制膨胀胶带浸泡前后厚度变化

    Figure 3. 

    图 4  3种抽水工况示意图

    Figure 4. 

    表 1  3种止水方案试验项目与可行性评价结果

    Table 1.  Test items and feasibility evaluation results of three water-stopping schemes

    方案理论孔径/mm装配外径/mm膨胀外径/mm充盈比/%组合特征实施可行性
    A方案95111131138胶带+海带装配外径超径无法入孔
    B方案9593140147胶带+海带装配外径比较合适
    C方案9593145153胶带+胶粒水泥伞装配整型困难
    下载: 导出CSV

    表 2  3种膨胀止水材料室内浸泡试验性能数据

    Table 2.  Indoor immersion test performance data of three kinds of expansive water-stopping materials

    材料名称规格形状浸泡/h膨胀率/%性状描述
    膨胀胶带宽100 mm、
    厚10 mm(定制)
    矩形条带状36厚200,宽120形状不变,体积增大,边界规整,有些类似产品
    呈絮状边界,不适宜
    优质食用海带薄片状8200体积净增加1倍,形状仍为薄片状,无絮状边界,具有一定的强度
    吸水膨胀胶粒颗粒状形态直径,约1.0 mm6200体积净增加1倍,形状仍为粒状,无絮状边界,强度很弱,靠其膨胀后溢出伞体外形成环状体进行止水
    下载: 导出CSV

    表 3  水文参数井分层抽水数据表

    Table 3.  Summary of layered pumping data of hydrological parameter well

    抽次控制流量/(m3∙h−1降深/m单位涌水量/(L∙s−1∙m−1影响半径/m渗透系数/(m∙d−1静止水位/m最高水温/°C
    第一次(下层)15.2692.790.0457156.500.028520.7146.5
    10.0761.150.0457100.400.027046.0
    5.9035.700.045956.470.025045.5
    第二次(上层)20.6931.300.1836123.700.156120.3046.0
    15.2623.000.184389.020.149845.5
    10.0715.100.185356.710.141145.0
    第三次(混合)30.7130.050.283992.530.094820.4546.5
    22.1221.050.291864.040.092646.0
    13.0313.030.299235.660.086945.5
    下载: 导出CSV
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收稿日期:  2022-04-10
修回日期:  2022-06-01
刊出日期:  2022-07-25

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