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CFRP布均匀约束煤圆柱轴压性能

李庆文 胡露露 曹行 曾杏钢 高森林 祝青云 刘艺伟 禹萌萌 黄筱

李庆文, 胡露露, 曹行, 等. CFRP布均匀约束煤圆柱轴压性能[J]. 复合材料学报, 2021, 39(0): 1-14
引用本文: 李庆文, 胡露露, 曹行, 等. CFRP布均匀约束煤圆柱轴压性能[J]. 复合材料学报, 2021, 39(0): 1-14
Qingwen LI, Lulu HU, Hang CAO, Xinggang ZENG, Senlin GAO, Qingyun ZHU, Yiwei LIU, Mengmeng YU, XIAO HUANG. Axial compressive behavior of CFRP uniformly wrapped coal in circular columns[J]. Acta Materiae Compositae Sinica.
Citation: Qingwen LI, Lulu HU, Hang CAO, Xinggang ZENG, Senlin GAO, Qingyun ZHU, Yiwei LIU, Mengmeng YU, XIAO HUANG. Axial compressive behavior of CFRP uniformly wrapped coal in circular columns[J]. Acta Materiae Compositae Sinica.

CFRP布均匀约束煤圆柱轴压性能

基金项目: 国家自然科学基金(51704144);辽宁省博士科研启动基金项目(2019-BS-120);辽宁省自然科学基金指导项目(20180550297)
详细信息
    通讯作者:

    李庆文,博士,讲师,硕士生导师,研究方向为新材料与新型组合结构及离散元-有限元耦合细观模拟 E-mail: lgjzlqw@163.com

  • 中图分类号: TU398+.9

Axial compressive behavior of CFRP uniformly wrapped coal in circular columns

  • 摘要: 为扩大纤维增强树脂复合材料(FRP)加固组合结构的应用范围,改善煤矿采空区煤柱的承载能力和变形能力,对碳纤维增强树脂复合材料(CFRP)均匀约束煤圆柱的轴压性能进行了研究。试验结果表明:因CFRP的均匀约束,致使煤圆柱破坏时基本保持原状,断口位置约为0.25~0.5倍煤样高度范围,轴向变形能力至少提高1.5倍;单、双层CFRP约束煤圆柱的峰值强度分别提高了3.56~6.34倍、6.33~11.21倍;相同CFRP布层数时,随加载速率的增大,CFRP约束煤圆柱的强度增强比则逐渐降低,且CFRP层数越多降低趋势越显著;CFRP层数对峰值强度的影响要比加载速率对峰值强度的影响更显著,加载速率对破坏时间的影响要比CFRP层数对破坏时间的影响更显著。获得了兼顾加载速率与CFRP层数的强度增强比三维可视化映射函数;建立了CFRP布约束煤圆柱的修正Richart强度分析模型,整体绝对误差评价指标表明模型性能优越,精度较高。

     

  • 图  1  碳纤维增强树脂复合材料(CFRP)约束煤样制备

    Figure  1.  Preparation of carbon fiber reinforced polymer (CFRP) confined coal specimens

    图  2  CFRP拉伸试验

    Figure  2.  Tensile test of the CFRP coupons

    图  3  CFRP荷载-应变曲线

    Figure  3.  Tensile load-axial strain curves of CFRP coupons

    图  4  CFRP约束煤样轴压试验加载及测量装置

    Figure  4.  Axial compression test loading and measuring device of CFRP confined coal specimen

    H1, H2, H3, H4—Hoop strain gauge of different angles; S1, S2—Axial strain gauge

    图  5  未约束煤样应力-应变曲线

    Figure  5.  Stress-strain curves of unconfined coal specimens

    图  6  CFRP约束煤样应力-应变曲线

    Figure  6.  Stress-strain curves of CFRP confined coal specimens

    图  7  CFRP布约束煤圆柱峰值强度与加载速率关系

    Figure  7.  Relation between peak strength and loading rate of CFRP confined coal columns

    图  8  CFRP布约束煤圆柱峰值强度三维曲面

    Figure  8.  3D surface of peak strength of CFRP confined coal columns

    图  9  CFRP布约束煤圆柱破坏时间-CFRP层数关系

    Figure  9.  Relationship between failure time and CFRP layers of CFRP confined coal columns

    图  10  CFRP布约束煤圆柱破坏时间三维函数曲面

    Figure  10.  3D function surface of failure time of CFRP confined coal columns

    图  11  未约束煤样不同高度处环向应变变化

    Figure  11.  Variation in hoop strain with different heights of unconfined coal specimens

    图  12  CFRP约束煤样不同高度处环向应变变化

    Figure  12.  Variation in hoop strain with different heights of CFRP-confined coal specimens

    图  13  CFRP布约束煤圆柱强度增强比-加载速率关系

    Figure  13.  Relationship between strength enhancement ratio and loading rate of CFRP confined coal columns

    图  14  CFRP布约束煤圆柱强度增强比三维函数曲面

    Figure  14.  3D surface of strength enhancement ratio of CFRP confined coal columns

    图  15  CFRP约束煤圆柱体受力平衡关系

    Figure  15.  Force equilibrium relationship of CFRP confined coal columns

    图  16  CFRP布约束煤圆柱强度修正模型拟合结果

    Figure  16.  Fitting results of strength of CFRP confined coal columns by modified models

    图  17  CFRP布约束煤圆柱强度理论值与试验值对比

    Figure  17.  Comparison of strength of CFRP confined coal columns between theoretical and experimental value

    表  1  CFRP加固煤圆柱的主要试验结果

    Table  1.   Main test results of coal columns strengthened with CFRP

    GroupSpecimen IDD/mmH/mmv/(mm·min−1)n/layersfpu/MPafpc/MPanftf/s
    1A-CC-149.60100.190.01015.792010.50
    A-CC-249.70100.320.01016.14
    A-CC-349.70100.480.01025.20
    A-1CFRP-CC-149.44100.370.011118.126.20312360.45
    A-1CFRP-CC-249.62100.520.011123.286.474
    A-2CFRP-CC-149.63100.400.012207.0810.87429193.37
    A-2CFRP-CC-249.64100.500.012220.0011.553
    2B-CC-149.59100.370.1019.03259.73
    B-CC-249.84100.440.1027.52
    B-CC-349.68100.280.1026.29
    B-1CFRP-CC-149.67100.420.11133.905.5151110.39
    B-1CFRP-CC-249.57100.400.11127.705.259
    B-2CFRP-CC-149.70100.370.12181.737.4851852.65
    B-2CFRP-CC-249.40100.320.12200.868.273
    3C-CC-149.55100.541.0020.9523.99
    C-CC-249.63100.391.0023.99
    C-CC-349.61100.241.0031.94
    C-1CFRP-CC-149.64100.291.01163.256.370105.44
    C-1CFRP-CC-249.68100.321.01136.765.337
    C-2CFRP-CC-149.81100.401.02187.187.304146.59
    C-2CFRP-CC-249.83100.321.02186.967.296
    4D-CC-149.42100.3610.0030.812.98
    D-CC-249.86100.3810.0034.81
    D-CC-349.55100.3910.0032.07
    D-1CFRP-CC-149.62100.3310.01121.353.7277.88
    D-1CFRP-CC-249.64100.4710.01110.403.390
    D-2CFRP-CC-149.89100.3710.02189.725.82612.36
    D-2CFRP-CC-249.74100.5110.02222.416.830
    Notes:In the specimen ID, A, B, C, D—Loading rates of 0.01mm·min−1、0.1mm·min−1、1.0mm·min−1 and 10mm·min−1, respectively; Number before CFRP—CFRP layer number; CC—Coal column; The last number—Specimen number with the same parameters. D—Diameter of coal; H—Height of coal; v—Loading rate; n—Number of CFRP layers; fpu—Peak strength of unconfined coal columns; fpc—Peak strength of CFRP-confined coal columns; nf—Strength enhancement ratio of CFRP-confined coal columns; tf—Average failure time.
    下载: 导出CSV

    表  2  CFRP平均力学性能指标

    Table  2.   Average mechanical properties of CFRP sheets

    Thickness/
    (mm·ply−1)
    Tensile
    strength/MPa
    Ultimate
    tensilestrain/%
    Elastic
    modulus/GPa
    0.167918.071.9447.54
    下载: 导出CSV

    表  3  代表性CFRP约束煤圆柱试样破坏

    Table  3.   Typical failure of CFRP confined coal column specimens

    n/layersv/(mm·min−1)
    0.010.11.010.0
    0
    1
    2
    下载: 导出CSV

    表  4  CFRP布约束煤圆柱强度修正模型参数

    Table  4.   Parameters of strength modified models of CFRP confined coal columns

    Param-
    eters
    Modified RichartModified Hoek-Brown
    αβγΨηθ
    Value3.49912.971.87−1292.770.22
    R20.940.70
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-10-19
  • 录用日期:  2021-11-24
  • 修回日期:  2021-11-10
  • 网络出版日期:  2021-12-21

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