实时高温作用下花岗岩冲击压缩力学特性研究

黄耀莹; 屈璐; 李宇白; 翟越; 谢怡帆

doi:10.11883/bzycj-2022-0196

实时高温作用下花岗岩冲击压缩力学特性研究

doi: 10.11883/bzycj-2022-0196

黄耀莹^1,,
屈璐^{1, 2, ,},
李宇白^{1, 2},
翟越^{1, 2},
谢怡帆¹

1.
长安大学地质工程与测绘学院，陕西西安 710064
2.
自然资源部矿山地质灾害成灾机理与防控重点实验室，陕西西安 710064

基金项目: 国家自然科学基金（41941019）；陕西省创新人才推进计划-科研创新团队（2021TD-55）；中央高校基本科研业务费专项（300102261101）

详细信息

作者简介:
黄耀莹（1999－　），女，硕士研究生，2021126140@chd.edu.cn

通讯作者:
屈　璐（1983－　），女，博士，讲师，qulu@chd.edu.cn

中图分类号: O383.2
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- 文章访问数: 400
- HTML全文浏览量: 101
- PDF下载量: 91
- 被引次数: 0
出版历程
- 收稿日期: 2022-05-09
- 修回日期: 2022-12-15
- 网络出版日期: 2023-01-05
- 刊出日期: 2023-02-25

Mechanical properties of granite under impact compression after real-time high temperature

HUANG Yaoying^1
,,
QU Lu^{1, 2
, ,},
LI Yubai^{1, 2},
ZHAI Yue^{1, 2},
XIE Yifan¹

1.
College of Geological Engineering and Geomatics, Chang’an University, Xi’an 710064, Shaanxi, China
2.
Key Laboratory of Mine Geological Disaster Mechanism and Prevention, Ministry of Natural Resources, Xi’an 710064, Shaanxi, China

摘要

摘要: 为研究实时高温作用对花岗岩冲击力学特性的影响，以川藏铁路色季拉山施工区域加里东期花岗岩为研究对象，利用分离式霍普金森杆（SHPB）及同步箱式电阻炉，对20～800 ℃实时高温下的花岗岩试件进行冲击压缩试验，分析高温作用及加载应变率对试件破碎特征、动态抗压强度及能量吸收情况的影响，基于粉晶X射线衍射分析矿物成分变化与花岗岩动力学强度的内在关联。研究表明：20～400 ℃高温试件以脆性劈裂破坏为主，碎片形态呈纺锤形，两端尖锐，而600 ℃高温试件以塑性破坏为主，形状趋于圆钝；试件峰值应力随温度升高具有先增大后减小的变化趋势，200 ℃时达到强度阈值，随后持续降低；单位体积岩石耗散能与加载应变率呈线性正相关关系，与温度呈二次函数关系，与峰值应力呈指数关系，拟合效果良好；石英、云母和长石三种主要矿物成分的含量波动、相态变化等因素共同导致花岗岩动力学强度在200 ℃后逐步劣化。
- 实时高温 /
- 花岗岩 /
- SHPB /
- 能量耗散 /
- XRD
Abstract: The study of thermal-mechanical coupling mechanism is of great significance to deep rock engineering such as rock tunnel fire, nuclear waste treatment and geothermal development. To investigate the effect of high temperature on the impact mechanical properties of granite, the real-time high temperature impact compression test was carried out on the granite specimen at 20～800 ℃. The Caledonian granite in the construction area of Sejila Mountain on Sichuan-Tibet Railway was taken as the research object, real-time high temperature impact compression tests were carried out on the specimens under five different temperatures ( 20, 200, 400, 600 and 800 ℃) with three average loading rates ( 72.8, 144.97 and 230.29 s⁻¹) by using the split Hopkinson pressure bar (SHPB) and synchronous box-type resistance furnace. The effects of high temperature and loading strain rate on the fracture characteristics, dynamic compressive strength and fractal dimension of the specimens were analyzed. The variation law of dissipated energy per unit volume was also studied and discussed. In addition, the intrinsic correlation between the change of mineral composition and the dynamic strength of granite was analyzed based on X-ray powder crystal diffraction. The results show that the brittle fracture of the specimens at 20 to 400 ℃ is dominant, and the fragments are spindle-shaped with sharp ends. The specimens at 600 ℃ are dominated by plastic failure, and their shapes tend to be round. The peak stress of specimens increases first and then decreases with the increase of temperature, reaches the strength threshold at 200 ℃, and then decreases continuously. The dissipated energy per unit volume of rock has a positive linear correlation with the loading strain rate and a quadratic function with the temperature, which shows a good fitting effect. The content fluctuation and phase change of the three main mineral components of quartz, mica and feldspar lead to the gradual deterioration of the dynamic strength of granite after 200 ℃.
- real-time high temperature /
- granite /
- SHPB /
- energy dissipation /
- XRD

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图 1 标准花岗岩试件

Figure 1. Standard granite specimens

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图 2 SHPB系统及同步智能箱式电阻炉

Figure 2. SHPB system and synchronous intelligent box-type resistance furnace

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图 3 同步高温炉测试系统结构示意

Figure 3. Sketch of synchronous high temperature furnace test system structure

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图 4 加载应变率曲线

Figure 4. Strain rate curves

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图 5 整形前后波形曲线

Figure 5. Waveforms without and with a pulse shaper

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图 6 800 ℃实时高温破碎试件

Figure 6. Broken specimen at 800 ℃ real-time high temperature

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图 7 74.8 s⁻¹应变率时，试件破碎形态

Figure 7. Fragmentation morphologies of the specimen at the strain rate of 74.8 s⁻¹

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图 8 144.97 s⁻¹应变率时，试件破碎形态

Figure 8. Fragmentation morphologies of the specimen at the strain rate of 144.97 s⁻¹

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图 9 230.29 s⁻¹应变率时，试件破碎形态

Figure 9. Fragmentation morphologies of the specimen at the strain rate of 230.29 s⁻¹

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图 10 破碎试件细节

Figure 10. Detail of the broken specimen

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图 11 应力-应变曲线

Figure 11. Stress-strain curves

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图 12 峰值应力与温度、冲击荷载关系

Figure 12. Relationship between peak stress and temperature and strain rate

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图 13 分形维数与温度、应变率关系

Figure 13. Relationship between fractal dimension and temperature and strain rate

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图 14 分形维数与峰值应力关系

Figure 14. Relationship between fractal dimension and peak stress

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图 15 能量时程曲线

Figure 15. Curve of energy

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图 16 体积能量与应变率关系

Figure 16. Relationship between volumic energy and strain rate

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图 17 体积能量与温度关系

Figure 17. Relationship between volumic energy and temperature

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图 18 动态抗压强度与体积能量关系

Figure 18. Relationship between fractal dimension and volumic energy of granite

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图 19 不同实时高温下花岗岩X衍射图谱

Figure 19. X-ray diffraction patterns of granite at different real-time high temperatures

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图 20 长石、云母相对含量之和与温度的关系

Figure 20. Relationship between the sum of feldspar and mica content and temperature

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表 1 SHPB试验参数

Table 1. Parameters of the test

气压/MPa 冲击速率/（m∙s⁻¹）平均应变率/s⁻¹

0.2 5.4 74.80
0.4 8.8 144.97
0.6 11.3 230.29

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表 2 峰值应力

Table 2. Peak stress

平均应变率/s⁻¹ 试件峰值应力/MPa
20 ℃ 200 ℃ 400 ℃ 600 ℃ 800 ℃

74.80 125.25 132.08 103.43 92.517 0
144.97 164.39 178.38 161.38 114.59 0
230.29 188.91 190.91 174.00 135.80 0

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表 3 体积能量

Table 3. Volumic energy

$ \bar \varepsilon $/s⁻¹ w/(J·cm⁻³)
20 ℃ 200 ℃ 400 ℃ 600 ℃ 800 ℃

74.80 0.49 0.36 0.46 0.76 0.49
144.97 1.56 1.22 1.25 1.46 1.56
230.29 3.61 3.24 3.31 4.40 3.61

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表 4 矿物成分的质量分数（%）

Table 4. Mass fraction (%) of the components

温度/℃ 石英长石云母绿泥石磁铁矿

20 53.4 32.2 7.2 2.2 5.0
200 52.5 35.6 8.4 1.7 0.5
400 77.4 17.1 3.4 1.4 0.7
600 33.3 50.0 13.2 1.5 0.6

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气压/MPa	冲击速率/（m∙s⁻¹）	平均应变率/s⁻¹
0.2	5.4	74.80
0.4	8.8	144.97
0.6	11.3	230.29

平均应变率/s⁻¹	试件峰值应力/MPa
平均应变率/s⁻¹	20 ℃	200 ℃	400 ℃	600 ℃	800 ℃
74.80	125.25	132.08	103.43	92.517	0
144.97	164.39	178.38	161.38	114.59	0
230.29	188.91	190.91	174.00	135.80	0

$ \bar \varepsilon $/s⁻¹	w/(J·cm⁻³)
$ \bar \varepsilon $/s⁻¹	20 ℃	200 ℃	400 ℃	600 ℃	800 ℃
74.80	0.49	0.36	0.46	0.76	0.49
144.97	1.56	1.22	1.25	1.46	1.56
230.29	3.61	3.24	3.31	4.40	3.61

温度/℃	石英	长石	云母	绿泥石	磁铁矿
20	53.4	32.2	7.2	2.2	5.0
200	52.5	35.6	8.4	1.7	0.5
400	77.4	17.1	3.4	1.4	0.7
600	33.3	50.0	13.2	1.5	0.6

实时高温作用下花岗岩冲击压缩力学特性研究

doi: 10.11883/bzycj-2022-0196

作者简介: 黄耀莹（1999－ ），女，硕士研究生，2021126140@chd.edu.cn

通讯作者: 屈 璐（1983－ ），女，博士，讲师，qulu@chd.edu.cn

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出版历程

Mechanical properties of granite under impact compression after real-time high temperature

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出版历程

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作者简介:
黄耀莹（1999－　），女，硕士研究生，2021126140@chd.edu.cn

通讯作者:
屈　璐（1983－　），女，博士，讲师，qulu@chd.edu.cn