水冷却对高温花岗岩的细观损伤及动力学性能影响

朱要亮 俞缙 高海东 李刚 周先齐 郑小青

朱要亮, 俞缙, 高海东, 李刚, 周先齐, 郑小青. 水冷却对高温花岗岩的细观损伤及动力学性能影响[J]. 爆炸与冲击, 2019, 39(8): 083104. doi: 10.11883/bzycj-2019-0169
引用本文: 朱要亮, 俞缙, 高海东, 李刚, 周先齐, 郑小青. 水冷却对高温花岗岩的细观损伤及动力学性能影响[J]. 爆炸与冲击, 2019, 39(8): 083104. doi: 10.11883/bzycj-2019-0169
ZHU Yaoliang, YU Jin, GAO Haidong, LI Gang, ZHOU Xianqi, ZHENG Xiaoqing. Effect of water cooling on microscopic damage and dynamic properties of high-temperature granite[J]. Explosion And Shock Waves, 2019, 39(8): 083104. doi: 10.11883/bzycj-2019-0169
Citation: ZHU Yaoliang, YU Jin, GAO Haidong, LI Gang, ZHOU Xianqi, ZHENG Xiaoqing. Effect of water cooling on microscopic damage and dynamic properties of high-temperature granite[J]. Explosion And Shock Waves, 2019, 39(8): 083104. doi: 10.11883/bzycj-2019-0169

水冷却对高温花岗岩的细观损伤及动力学性能影响

doi: 10.11883/bzycj-2019-0169
基金项目: 国家自然科学基金(51874144,51679093);福建省自然科学基金(2018J01630)
详细信息
    作者简介:

    朱要亮(1985- ),男,博士研究生,ziaini@126.com

    通讯作者:

    俞 缙(1978- ),男,博士,教授,博导,bugyu0717@163.com

  • 中图分类号: O346.5; TU 452

Effect of water cooling on microscopic damage and dynamic properties of high-temperature granite

  • 摘要: 为探讨高温花岗岩经水冷却后的细观结构损伤及动态力学性能,对水冷却后高温花岗岩开展波速和核磁共振测试,分离式霍普金森压杆冲击试验,以及冲击破碎试样的扫描电镜观察,分析比较不同状态下花岗岩波速、孔隙度和动力学参数的变化规律。研究发现:随着温度升高,经水冷却处理后高温花岗岩波速非线性下降,大孔径孔隙度分量增大,且水冷却后试样的孔隙孔径尺寸和数量均大于自然冷却;水冷却后高温花岗岩动力学参数呈现出随着温度升高,峰值应力减小,峰值应变增大,弹性模量则先增大后减小的规律;由于水冷却使高温花岗岩表面温度急剧降低,产生额外的温度应力,花岗岩内部损伤加剧,表现出更低的波速与峰值应力;而水的冷淬作用一定程度上提高了表层花岗岩的硬度,降低了高温后花岗岩的塑性能力,与自然冷却相比水冷却后花岗岩的峰值应变减小,弹性模量增大,表现出脆性破坏特征。在温度低于400 ℃时,冷却方式对冲击裂纹影响不大,随着温度升高到800 ℃,自然冷却后花岗岩冲击断面呈蜂窝状,而水冷却后冲击断面则相对平整。
  • 图  1  高温花岗岩典型SHPB应力波形

    Figure  1.  Typical SHPB stress waveforms for high-temperature granite specimens

    图  2  高温花岗岩不同温度后纵波波形图

    Figure  2.  Longitudinal waveforms of granite sample exposed to different temperatures

    图  3  高温前后纵波波速均值对比

    Figure  3.  Comparison of average longitudinal wave velocity before and after exposure to high temperature

    图  4  核磁共振孔径分布及断面扫描图

    Figure  4.  Pore size distribution curves and scanning images of cross-sectional area

    图  5  花岗岩动态应力应变曲线图

    Figure  5.  Dynamic stress-strain curves of granite

    图  6  花岗岩动态峰值应力

    Figure  6.  Dynamic peak stress of granite

    图  7  花岗岩动态峰值应变

    Figure  7.  Dynamic peak strain of granite

    图  8  弹性模量随温度变化曲线

    Figure  8.  Variation of dynamic elastic modulus EC with temperature

    图  9  花岗岩冲击破坏形态

    Figure  9.  Failure forms of granite under different temperatures and different cooling methods

    图  10  花岗岩样品成像伪彩图

    Figure  10.  pseudo-color image of granite sample

    图  11  温度模拟结果

    Figure  11.  Simulation results for temperature

    图  12  水冷却花岗岩表面裂缝

    Figure  12.  Surface cracks in granite specimen after water cooling

    图  13  冲击破坏后的SEM形貌

    Figure  13.  SEM image after impact damage

    表  1  核磁共振T2谱面积

    Table  1.   T2 spectrum area of NMR

    冷却方式T2 谱面积
    25 ℃200 ℃400 ℃600 ℃800 ℃
    自然冷却1 8521 9102 0863 0724 029
    水冷却1 8521 9812 2543 5444 887
    下载: 导出CSV
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  • 收稿日期:  2019-04-26
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