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非饱和花岗岩残积土水-气两相驱替过程数值模拟

蔡沛辰 阙云 李显

蔡沛辰, 阙云, 李显. 非饱和花岗岩残积土水-气两相驱替过程数值模拟[J]. 水文地质工程地质, 2021, 48(6): 54-63. doi: 10.16030/j.cnki.issn.1000-3665.202010017
引用本文: 蔡沛辰, 阙云, 李显. 非饱和花岗岩残积土水-气两相驱替过程数值模拟[J]. 水文地质工程地质, 2021, 48(6): 54-63. doi: 10.16030/j.cnki.issn.1000-3665.202010017
CAI Peichen, QUE Yun, LI Xian. Numerical simulation of water-gas two-phase displacement process in unsaturated granite residual soil[J]. Hydrogeology & Engineering Geology, 2021, 48(6): 54-63. doi: 10.16030/j.cnki.issn.1000-3665.202010017
Citation: CAI Peichen, QUE Yun, LI Xian. Numerical simulation of water-gas two-phase displacement process in unsaturated granite residual soil[J]. Hydrogeology & Engineering Geology, 2021, 48(6): 54-63. doi: 10.16030/j.cnki.issn.1000-3665.202010017

非饱和花岗岩残积土水-气两相驱替过程数值模拟

doi: 10.16030/j.cnki.issn.1000-3665.202010017
基金项目: 国家自然科学基金项目(41772297);福建省自然科学基金项目(2018J01771)
详细信息
    作者简介:

    蔡沛辰(1998-),男,硕士研究生,主要从事细观尺度渗流研究工作。E-mail: peichen_fut@qq.com

    通讯作者:

    阙云(1980-),男,教授,博士,主要从事土壤渗流方面的研究和教学工作。E-mail: queyun_2001@fzu.edu.cn

  • 中图分类号: P641.2;TU43

Numerical simulation of water-gas two-phase displacement process in unsaturated granite residual soil

  • 摘要: 水流在非饱和土体中的入渗过程实质上是水在下渗的过程中驱替空气的两相流问题。为揭示非饱和花岗岩残积土水-气两相驱替动态渗流机理,选取福州某地原状花岗岩残积土作为研究对象,基于工业CT扫描图像与Level Set方法,研究了原状土样两相驱替的动态特征。结果表明:对于细观尺度水-气两相驱替模拟,Level Set法能很好地捕捉两种不混溶流体间的界面位置;水-气两相驱替过程存在大孔隙优先流特征,且“绕流”现象一般易于出现在孔隙成圆度较高处;两相渗流速度主要受孔道迂回度控制,笔直、较宽孔道,渗流速度相对较高,同时存在明显的“优势通道”,且随渗流时间增大以先急后缓的特征呈正相关变化,最大增速率为 10.77%,最小仅 1.90%;孔道横截面速度大小分布与孔隙结构有关,“回流”和“绕流”现象会使驱替速度骤降,降低幅度可达21.62%;驱替阻力最大出现在孔壁处,孔道越窄,阻力越大;驱替效率与驱替压差成正比关系,且初期加压增速效果显著,可达25.49%,后期仅为1.47%。该研究成果可丰富降雨型滑坡理论基础并预防灾害产生,具有重要的理论价值及工程意义。
  • 图  1  现场取样

    Figure  1.  Field sampling

    图  2  二维扫描切片

    Figure  2.  2D scanning slice

    图  3  模型a—d二值化图像

    Figure  3.  Model a—d binarized image

    图  4  模型b的计算几何模型及网格质量分布图

    Figure  4.  Computational geometric model and mesh quality distribution map of model b

    图  5  边界条件设定

    Figure  5.  Boundary condition setting

    图  6  水、气相占孔隙区域的面积随时间变化曲线

    Figure  6.  The area curve of water and gas in the pore area with time

    图  7  不同时刻水-气两相驱替过程动态示意图

    Figure  7.  Dynamic schematic diagram of the water-gas two-phase displacement process at different times

    图  8  不同时刻水-气两相驱替过程速度可视化图

    Figure  8.  Visualized diagram of water-gas two-phase displacement process speed at different times

    图  9  不同孔道横截面速度分布图

    Figure  9.  Velocity distribution diagram of different tunnel cross sections

    图  10  不同时刻水-气两相驱替阻力分布情况

    Figure  10.  Resistance distribution of water-gas two-phase displacement at different times

    图  11  不同情况下驱替率曲线

    Figure  11.  Displacement rate curve under different conditions

    表  1  材料属性

    Table  1.   Material properties

    类别界面张力/(N·m−1密度/(kg·m−3动力黏度/(Pa·s)
    水相4.80×10−210001.01×10−3
    气相4.80×10−21.2091.79×10−5
    下载: 导出CSV

    表  2  两相流驱替研究结果对比

    Table  2.   Comparison of research results of two-phase flow displacement

    类别学者吴丰等[22]冯其红等[21]高亚军等[14]张鹏伟等[23]本文
    对象岩石砂岩岩石孔隙模型花岗岩残积土
    驱替类型气驱水水驱油水驱油气驱水水驱气
    驱替可视化过程微观指进非平行推进微观指进优势渗流回流、绕流
    驱替速度越靠近孔壁流速越小速度越大采出程度越高孔道中心流速最大,
    壁面流速最小
    孔道中心流速并非最大,
    回流使流速骤降
    驱替阻力出口见气后,阻力减小孔道越窄,阻力越大,
    最大值出现在孔壁
    驱替效率出口见气后效率不变受孔喉、驱替速度、
    流体影响
    与压差成正比,
    初期加压增速显著
    下载: 导出CSV
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    QIAO Liang. Numerical simulation study on aerated water flow characteristics of sudden expansion and sudden fall of spillway tunnel[D]. Kunming: Kunming University of Science and Technology, 2014. (in Chinese with English abstract)
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出版历程
  • 收稿日期:  2020-10-12
  • 修回日期:  2021-03-05
  • 网络出版日期:  2021-11-01
  • 刊出日期:  2021-11-15

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