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煤层液态CO2相变致裂半径预测研究

王长禄 彭然 郑义 李伟 姚海飞

王长禄,彭然,郑义,等. 煤层液态CO2相变致裂半径预测研究[J]. 工矿自动化,2023,49(10):110-117.  doi: 10.13272/j.issn.1671-251x.2023040076
引用本文: 王长禄,彭然,郑义,等. 煤层液态CO2相变致裂半径预测研究[J]. 工矿自动化,2023,49(10):110-117.  doi: 10.13272/j.issn.1671-251x.2023040076
WANG Changlu, PENG Ran, ZHENG Yi, et al. Research on the prediction of liquid CO2 phase transition cracking radius in coal seams[J]. Journal of Mine Automation,2023,49(10):110-117.  doi: 10.13272/j.issn.1671-251x.2023040076
Citation: WANG Changlu, PENG Ran, ZHENG Yi, et al. Research on the prediction of liquid CO2 phase transition cracking radius in coal seams[J]. Journal of Mine Automation,2023,49(10):110-117.  doi: 10.13272/j.issn.1671-251x.2023040076

煤层液态CO2相变致裂半径预测研究

doi: 10.13272/j.issn.1671-251x.2023040076
基金项目: 国家自然科学基金项目(52130409);天地科技股份有限公司科技创新创业资金专项项目(2021-2-TD-MS001)。
详细信息
    作者简介:

    王长禄(1993—),男,辽宁丹东人,硕士,主要研究方向为安全评价及瓦斯灾害防治,E-mail:changlu202303@163.com

  • 中图分类号: TD712

Research on the prediction of liquid CO2 phase transition cracking radius in coal seams

  • 摘要: 预测致裂半径是确定液态CO2相变致裂增透瓦斯抽采技术布孔间距的前提,直接影响瓦斯抽采效果。现有预测方法大多基于单因素。为掌握多因素对液态CO2相变致裂半径的影响规律,有效预测布孔间距,采用ANSYS/LS−DYNA数值模拟软件,结合正交试验,开展了煤层液态CO2相变致裂半径预测研究。数值模拟结果表明:影响液态CO2相变致裂半径的因素主次顺序为地应力>瓦斯压力>煤体坚固性系数;致裂半径随地应力增大而减小,随瓦斯压力和煤体坚固性系数增大而增大,且呈线性关系。对数值模拟结果进行多元回归分析,建立了基于地应力、瓦斯压力及煤体坚固性系数3组不同因素耦合条件下的液态CO2相变致裂半径预测模型。在煤矿现场进行工业性试验,基于预测模型计算结果设置抽采钻孔,采用压力指标法对瓦斯抽采效果进行测试分析,结果表明:液态CO2相变致裂孔两侧观测孔的瓦斯压力随时间增加呈递减趋势,且抽采初期距致裂孔越远,则压力越大,与理论分析及数值模拟结果一致;液态CO2相变有效致裂范围与预测结果基本相符;观测孔瓦斯抽采体积分数较自然抽采孔提高73.4%,瓦斯抽采效率显著提高。

     

  • 图  1  液态CO2相变爆破裂隙发育分布

    Figure  1.  Fracture development distribution by liquid CO2 phase transition blasting

    图  2  液态CO2相变致裂数值模型

    Figure  2.  Numerical model of liquid CO2 phase transition cracking

    图  3  液态CO2相变致裂模拟演化过程

    Figure  3.  Simulated evolution process of liquid CO2 phase transition cracking

    图  4  三因素耦合作用下的致裂效果

    Figure  4.  Cracking effect under three factors coupling

    图  5  各因素对液态CO2相变致裂半径的影响

    Figure  5.  Influence of various factors on liquid CO2 phase transition cracking radius

    图  6  现场工业性试验布孔方式

    Figure  6.  Borehole arrangement in industrial field test

    图  7  观测孔瓦斯压力变化

    Figure  7.  Gas pressure change of observation borehole

    图  8  钻孔瓦斯体积分数对比

    Figure  8.  Gas concentration comparison of different borehole

    表  1  煤体材料参数

    Table  1.   Coal material parameters

    密度/
    (g·cm−3
    弹性模
    量/MPa
    泊松比 抗拉强
    度/MPa
    抗压强
    度/MPa
    黏聚力/
    MPa
    1.54 1.74 0.3 0.84 2.2 2.5
    下载: 导出CSV

    表  2  模拟方案正交设计

    Table  2.   Orthogonal design of simulation scheme

    组号地应力/MPa瓦斯压力/MPa煤体坚固性系数空白列
    160.20.50
    260.30.70
    360.40.80
    480.20.70
    580.30.80
    680.40.50
    7100.20.80
    8100.30.50
    9100.40.70
    下载: 导出CSV

    表  3  致裂半径极差分析

    Table  3.   Range analysis of cracking radius

    指标地应力瓦斯压力煤体坚固性系数空白列
    均值12.5182.1172.1822.234
    均值22.2342.2342.2442.234
    均值31.9502.3502.2752.234
    极差0.5680.2330.0930
    下载: 导出CSV

    表  4  正交设计方差分析

    Table  4.   Variance analysis of orthogonal design

    指标地应力瓦斯压力煤体坚固性系数
    偏差平方和 0.484 0.082 0.013
    自由度 2 2 2
    F比值 3.344 0.566 0.090
    显著度 置信度90% * * *
    置信度95% * * *
    置信度99% * * *
     注:*表示具有较高显著度。
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-04-24
  • 修回日期:  2023-10-14
  • 网络出版日期:  2023-10-25

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