矿井水深层回灌过程量质耦合模拟分析

赵春虎, 杨建, 王世东, 周建军, 许峰, 刘基

赵春虎, 杨建, 王世东, 周建军, 许峰, 刘基. 矿井水深层回灌过程量质耦合模拟分析[J]. 煤田地质与勘探, 2021, 49(5): 36-44. DOI: 10.3969/j.issn.1001-1986.2021.05.004
引用本文: 赵春虎, 杨建, 王世东, 周建军, 许峰, 刘基. 矿井水深层回灌过程量质耦合模拟分析[J]. 煤田地质与勘探, 2021, 49(5): 36-44. DOI: 10.3969/j.issn.1001-1986.2021.05.004
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ZHAO Chunhu, YANG Jian, WANG Shidong, ZHOU Jianjun, XU Feng, LIU Ji. Coupling simulation of groundwater dynamics and solute transfer in the process of deep reinjection of mine water[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(5): 36-44. DOI: 10.3969/j.issn.1001-1986.2021.05.004
Citation: ZHAO Chunhu, YANG Jian, WANG Shidong, ZHOU Jianjun, XU Feng, LIU Ji. Coupling simulation of groundwater dynamics and solute transfer in the process of deep reinjection of mine water[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(5): 36-44. DOI: 10.3969/j.issn.1001-1986.2021.05.004
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矿井水深层回灌过程量质耦合模拟分析

  • 1.

    中煤科工集团西安研究院有限公司，陕西 西安 710077

  • 2.

    陕西省煤矿水害防治技术重点实验室，陕西 西安 710077

基金项目: 

陕西省自然科学基础研究计划项目 2020JM-715

天地科技股份有限公司科技创新基金项目 2018-TD-MS069

天地科技股份有限公司科技创新基金项目 2018-TD-QN052

详细信息
    作者简介:

    赵春虎，1981年生，男，陕西扶风人，博士，研究员，从事矿山水害防治与矿区水环境保护研究. E-mail: zhaochunhu@cctegxian.com

  • 中图分类号: TD32

Coupling simulation of groundwater dynamics and solute transfer in the process of deep reinjection of mine water

  • 1.

    Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China

  • 2.

    Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard, Xi'an 710077, China

摘要

    摘要
  • 摘要: 矿井水深井回灌是矿井水“转移存储”处理的主要形式，根据鄂尔多斯盆地煤矿区地质和矿井水特征，从回灌目的层地下水与矿井水的匹配性、上下岩层的隔水性、回灌层的渗透性以及封闭性角度提出了矿井水回灌目的层选取依据。并以地下水达西定律和Dupuit理论为基础，建立极坐标系完整注水井稳定流数学模型，得出在稳定注水条件下，回灌量与注水层渗透系数、厚度、回灌压力、水位埋深以及回灌井直径正相关，与影响半径负相关，与回灌层埋深无关。提出了矿井水深层回灌水动力和溶质运移耦合仿真模型构建方法，并以矿井水回灌试验案例为分析对象，模拟得出矿井水回灌过程中含水层水压形成以注水井为中心的“高位水丘”，且注水压力越大，回灌量增加较为明显，模型分析结果与现场试验结果基本一致。溶质运移范围形成以注水井为中心的“圆柱状”弥散形态，特征离子浓度沿回灌井两侧变化剧烈，回灌层特征离子浓度被迅速稀释，随着时间的延伸，弥散稀释范围增加相对较小，说明矿井水回灌对深部高浓度含水层地下水水化学影响程度不大，研究成果可为西部煤矿区矿井水高效回灌处理提供科学依据。
    Abstract: The deep well reinjection of mine water is a main form of "transfer storage" treatment of mine water. According to the geological and mine water characteristics of the coal mine area in Ordos Basin, the paper puts forward the basis for selecting the target layer of mine water reinjection from the perspective of good matching between groundwater and mine water in the target layer of reinjection, the water isolation of upper and lower strata, permeability and sealing of the reinjection layer. Based on Darcy's law of groundwater and Dupuit's theory, a mathematical model of steady flow of water injection well in polar coordinate system is established. It is concluded that under the condition of steady water injection, the reinjection quantity is positively correlated with the permeability coefficient, thickness, reinjection pressure, water level burial depth and reinjection well diameter of water injection layer, negatively correlated with the influence radius, and it has nothing to do with the burial depth of water injection layer. The construction method of coupling simulation model of groundwater dynamics and solute transfer in the process of deep mine water reinjection was put forward, and mine water reinjection test was taken as the analysis object. The simulation results show that the formation of water injection well is the "high water mound" in the process of high-pressure mine water reinjection; the higher the injection pressure is, the more obvious the reinjection amount is. The model analysis results are basically consistent with the field test results. Moreover, the solute transfer range forms a "cylindrical" dispersion shape centered on the water injection well; the ion concentration changes sharply along both sides of the reinjection well; the ion concentration of the aquifer is rapidly diluted. With the extension of time, the increase of dispersion dilution range is relatively small, which indicates that the relative recharge of mine water has little effect on groundwater chemistry of deep high concentration aquifer. The research results are expected to provide scientific basis for efficient recharge of mine water in western coal mining area.
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  • 图  1   矿井水深层回灌

    Fig.  1   Schematic diagram of deep recharge of mine water

    下载: 全尺寸图片 幻灯片

    图  2   矿井水深层回灌数值模型

    Fig.  2   Numerical model of deep recharge of mine water

    下载: 全尺寸图片 幻灯片

    图  3   矿井水深层回灌过程中地下水动力演化

    Fig.  3   Simulation map of groundwater dynamic evolution in the process of deep groundwater recharge

    下载: 全尺寸图片 幻灯片

    图  4   不同回灌压力下回灌层稳定水压力分布

    Fig.  4   Distribution of stable water pressure in reinjection layer under different reinjection pressures

    下载: 全尺寸图片 幻灯片

    图  5   不同回灌压力下回灌水量随时间变化

    Fig.  5   Variation of reinjection amount with time under different reinjection pressures

    下载: 全尺寸图片 幻灯片

    图  6   矿井水回灌过程中特征离子(Cl-)运移范围

    Fig.  6   Migration range of characteristic ions(Cl-) in the process of mine water recharge

    下载: 全尺寸图片 幻灯片

    图  7   不同回灌压力下特征离子(Cl-)运移范围

    Fig.  7   Migration range of characteristic ions(Cl-) under different reinjection pressures

    下载: 全尺寸图片 幻灯片

    表  1   模型主要参数

    Table  1   Main parameters of the numerical model

    参数 数值
    注水井直径/mm 216
    注水井深度/m 496
    回灌层初始水位埋深/m 200
    回灌层渗透系数K/(m·d-1) 0.011 3
    回灌层弹性给水度S/d-1 5×10-8
    回灌层横向弥散度αL/m 0.5[27]
    回灌层纵向弥散度αT/m 5[27]
    矿井水Cl-质量浓度/(mg·L-1) 70
    回灌层Cl-初始质量浓度C0/(mg·L-1) 40 000
    井口回灌压力p/MPa 6、7、8
    下载: 导出CSV

    表  2   案例矿井回灌实际试验成果和回灌层渗透系数

    Table  2   Results of reinjection test and calculation of permeability coefficient in case mine

    井口压力/MPa 稳定注水量/(m3·h-1) 反演渗透系数/(m·d-1)
    7.0~8.5 98.0 0.011 07
    6.2 68.2 0.013 44
    6.7 71.8 0.015 18
    下载: 导出CSV
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  • 收稿日期:  2021-04-07
  • 修回日期:  2021-08-04
  • 网络出版日期:  2021-11-05
  • 发布日期:  2021-10-24

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