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

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

朱要亮^{1, 2,},
俞缙^1, ,,
高海东³,
李刚³,
周先齐¹,
郑小青²

1.
华侨大学福建省隧道与城市地下空间工程技术研究中心，福建厦门 361021
2.
福建江夏学院工程学院，福建福州 350108
3.
中铁十八局集团有限公司，天津 300222

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
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- 被引次数: 0
出版历程
- 收稿日期: 2019-04-26
- 修回日期: 2019-05-21
- 刊出日期: 2019-08-01

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

1.
Fujian Research Center for Tunneling and Urban Underground Space Engineering, Huaqiao University, Xiamen 361021, Fujian, China
2.
College of Engineering, Fujian Jiangxia University, Fuzhou 350108, Fujian, China
3.
China Railway 18 Bureau Group Co., Ltd., Tianjin 300222, China

摘要

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。
- 高温花岗岩 /
- 水冷却 /
- 细观损伤 /
- 动力性能 /
- 冷淬作用
Abstract: The microscopic damage and dynamic mechanical properties of high-temperature granite after water cooling were studied through wave velocity test, nuclear magnetic resonance (NMR) test, split Hopkinson pressure bar (SHPB) impact test and scanning electron microscope（SEM）test. The variation of porosity and dynamic mechanical parameters of granite were analyzed. The results show that the wave velocity of high-temperature granite decreases nonlinearly after water cooling and the components of porosity with large pore increase with the increase of temperature. Moreover, water cooling leads to the more cracks and greater crack sizes than that of natural cooling. The dynamic parameters of high-temperature granite after water cooling show that the increase in temperature results in a decrease in the peak stress, an increase in the peak strain, and an increase at first then decrease in the elastic modulus. Additional thermal stress, resulted from sharply decrease in surface temperature of the high-temperature granite, leads to increased internal damage and decreased wave velocity and peak stress. Compared with natural cooling, the plasticity of high-temperature granite is reduced, because the cold hardening effect improves the hardness of surface granite. After water cooling, the granite specimens exhibit the brittle failure characteristics and their peak strain decreases but their elastic modulus increases. Cooling way has a minor effect on the cracks induced by shock before 400 ℃. As the temperature up to 800 ℃, the impact fracture surface of granite after natural cooling is characterized by honeycomb and irregular shape, in contrast, the impact fracture surface of granite after the water cooling is relatively flat.
- high-temperature granite /
- water cooling /
- microscopic damage /
- dynamic mechanical properties /
- cold hardening effect

HTML全文

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

下载: 全尺寸图片幻灯片

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

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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

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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

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图 5 花岗岩动态应力应变曲线图

Figure 5. Dynamic stress-strain curves of granite

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图 6 花岗岩动态峰值应力

Figure 6. Dynamic peak stress of granite

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图 7 花岗岩动态峰值应变

Figure 7. Dynamic peak strain of granite

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图 8 弹性模量随温度变化曲线

Figure 8. Variation of dynamic elastic modulus EC with temperature

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图 9 花岗岩冲击破坏形态

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

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图 10 花岗岩样品成像伪彩图

Figure 10. pseudo-color image of granite sample

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图 11 温度模拟结果

Figure 11. Simulation results for temperature

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图 12 水冷却花岗岩表面裂缝

Figure 12. Surface cracks in granite specimen after water cooling

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图 13 冲击破坏后的SEM形貌

Figure 13. SEM image after impact damage

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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 1 852 1 910 2 086 3 072 4 029
水冷却 1 852 1 981 2 254 3 544 4 887

下载: 导出CSV

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