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重力条件下粗糙裂隙溶蚀过程的可视化实验研究

张子翼 胡冉 廖震 陈益峰

张子翼,胡冉,廖震,等. 重力条件下粗糙裂隙溶蚀过程的可视化实验研究[J]. 水文地质工程地质,2023,50(0): 1-11 doi:  10.16030/j.cnki.issn.1000-3665.202204044
引用本文: 张子翼,胡冉,廖震,等. 重力条件下粗糙裂隙溶蚀过程的可视化实验研究[J]. 水文地质工程地质,2023,50(0): 1-11 doi:  10.16030/j.cnki.issn.1000-3665.202204044
ZHANG Ziyi, HU Ran, LIAO Zhen, et al. Visualization experimental investigation into the dissolution processes in rough fracture under gravity conditions[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-11 doi:  10.16030/j.cnki.issn.1000-3665.202204044
Citation: ZHANG Ziyi, HU Ran, LIAO Zhen, et al. Visualization experimental investigation into the dissolution processes in rough fracture under gravity conditions[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-11 doi:  10.16030/j.cnki.issn.1000-3665.202204044

重力条件下粗糙裂隙溶蚀过程的可视化实验研究

doi: 10.16030/j.cnki.issn.1000-3665.202204044
基金项目: 国家自然科学基金项目(52122905;51988101;51925906)
详细信息
    作者简介:

    张子翼(1997-),男,硕士研究生,主要从事岩体结构面溶蚀机理方面的研究。E-mail:2015301580338@whu.edu.cn

    通讯作者:

    胡冉(1985-),男,博士,教授,博士生导师,主要从事岩土多相渗流理论与应用方面的研究工作。E-mail:whuran@whu.edu.cn

  • 中图分类号: 中图分类号: 文献标志码:A

Visualization experimental investigation into the dissolution processes in rough fracture under gravity conditions

  • 摘要: 岩体裂隙的溶蚀现象广泛存在于自然过程和工程实践,重力对溶蚀过程具有重要作用。可视化观测技术是研究粗糙裂隙溶蚀机理的关键手段,然而传统的可视化技术存在裂隙粗糙壁面难以复制、溶蚀过程难以实时观测等问题。通过自主研发的粗糙裂隙溶蚀过程可视化实验平台,开展了垂直裂隙和水平裂隙在4种流量条件(0.05,0.1,0.3,1 mL/min)下的溶蚀可视化实验,研究了重力效应对溶蚀模式和溶蚀形态的影响,采用分形维数量化了不同溶蚀模式的形态学特征,最终确定了不同佩克莱数(Pe)条件下的突破时注液量。实验结果表明:在Pe≤62.1范围内,重力效应对溶蚀模式具有重要影响,垂直裂隙中的溶蚀发育为浮力主导模式和通道模式,重力效应将诱发单一、集中的溶蚀通道;而水平裂隙则统一发育为开度演变均匀、宽度较大的通道,即经典的虫洞溶蚀模式;在Pe数较大时(Pe=207)时,垂直裂隙和水平裂隙中的溶蚀均发育为均匀溶蚀。实验结果还证实了垂直裂隙更易发育为贯通的溶蚀通道,从而加速溶蚀突破;Pe=20.7时为最优注入条件,垂直裂隙的突破时注液量最小。在此条件下,垂直裂隙的突破时注液量仅为水平裂隙的1/4。建议重点关注重力效应对溶蚀过程的影响,研究结果对CO2地质封存等工程实践具有重要意义。
  • 图  1  粗糙裂隙溶蚀过程可视化实验装置及裂隙模型

    Figure  1.  Flow-visualization experimental set-up for fracture dissolution processes and fabrication of the fracture model

    图  2  裂隙初始开度分布图及各组裂隙初始开度频率直方图

    Figure  2.  Initial aperture distribution and histogram of frequency distribution of the initial aperture for each fracture

    图  3  溶蚀诱发粗糙裂隙开度变化的图像后处理技术

    Figure  3.  Images post-process for the dissolution-induced aperture change in rough fractures

    图  4  粗糙裂隙的溶蚀形态

    Figure  4.  Dissolution morphologies for rough fractures

    图  5  PV=20时粗糙裂隙溶蚀形态的分形维数随Pe的变化特征

    Figure  5.  Variation of fractal dimensions with the Peclet number for distribution of aperture growth when 20 PVs of brine is injected

    图  6  开度变化量Δb (注入体积为20 PV)沿主流方向的平均值<Δb>y随y的变化特征(a, b, c)及其相对应开度变化云图

    Figure  6.  Variation of the average aperture alternation (a, b, c) in the mainstream direction <Δb>y with y and corresponding aperture alternation colormaps when 20 PVs of brine is injected

    图  7  裂隙开度横向半变异函数图

    Figure  7.  Transverse semivariance of the fracture aperture

    图  8  垂直裂隙和水平裂隙突破时注液量(PVBT)随Pe数的变化特征

    Figure  8.  Variation of pore volumes at breakthrough (PVBT) with Pe number for vertical and horizontal fractures

    表  1  实验条件

    Table  1.   Experimental conditions

    裂隙倾角/(°)实验组. #QPe
    /(mL·min-1
    90V11207
    V20.362.1
    V30.120.7
    V40.0510.4
    0H11207
    H20.362.1
    H30.120.7
    H40.0510.4
    下载: 导出CSV
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  • 收稿日期:  2022-04-19
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