高温后深部矽卡岩动力学特性及微观破坏机制研究

刘磊; 李睿; 秦浩; 刘洋

doi:10.11779/CJGE202206022

高温后深部矽卡岩动力学特性及微观破坏机制研究 English Version

刘磊^1,,
李睿¹,
秦浩¹,
刘洋^2, ,

1.
昆明理工大学国土资源工程学院，云南昆明 650093
2.
安徽省城市建设和地下空间工程技术研究中心（安徽建筑大学），安徽合肥 230601

基金项目:

国家自然科学基金项目 11862010

详细信息

作者简介:
刘磊(1981—)，男，副教授，博士，主要从事工程爆破与安全方面的教学和科研。E-mail: kgliulei@kust.edu.cn

通讯作者:
刘洋, E-mail: liuyang880205@126.com

中图分类号: TU45
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出版历程
- 收稿日期: 2021-08-17
- 网络出版日期: 2022-09-22
- 刊出日期: 2022-05-31

Dynamic mechanical properties and microscopic damage characteristics of deep skarn after high-temperature treatment

LIU Lei^1,,
LI Rui¹,
QIN Hao¹,
LIU Yang^2, ,

1.
Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
2.
Anhui Province Engineering Technology Research Center of Urban Construction and Underground Space, Anhui Jianzhu University, Hefei 230601, China

摘要

摘要: 以深部700 m处矽卡岩为研究对象，采用分离式霍普金森压杆装置开展不同冲击气压（0.8，1.0，1.2 MPa）下常温和经历不同温度（200℃，400℃，600℃，800℃）作用后的岩石冲击压缩试验，研究深部岩石的高温动力学行为；借助SEM扫描电镜及XRD物相特征分析技术，探索矽卡岩在高温和动载作用下的微观破坏机制。结果表明：相同冲击气压作用下，随着温度的升高，矽卡岩强度劣化、延性增强；相同温度条件下，随着冲击气压的增大，矽卡岩强度和变形均增大，表现出明显的应变率效应。冲击气压增大或温度升高，矽卡岩破碎程度均越来越剧烈，破碎块度越来越小，800℃时破碎状态以颗粒较小的碎石和粉末状为主。内部组分及结构的变化是造成矽卡岩力学性能变化的主要原因，25℃~400℃矽卡岩主要为穿晶和沿晶断裂的脆性破坏；400℃~600℃为矽卡岩由脆性向塑性转化的阈值温度区间；600℃~800℃时则转变为韧窝和滑移断裂的塑性破坏。
- 矽卡岩 /
- 高温 /
- SHPB /
- 动态力学特性 /
- 微观
Abstract: The skarn at a depth of 700 m is taken as the research object to study the dynamic behaviors of deep rocks under high temperature. The impact compression tests at different impact air pressures (0.8, 1.0 and 1.2 MPa) are carried out on the skarn at room temperature and after high-temperature treatment (200 ℃, 400 ℃, 600 ℃ and 800 ℃) by using the split Hopkinson press bar experimental device. The fracture surface is observed by the SEM scanning electron microscope and XRD phase characteristic analysis technology to explore the micro-failure mechanism of the skarn under high temperature and dynamic load. The test results show that under the same impact air pressure, the strength of the skarn deteriorates and the ductility increases with the increase of temperature. And at the same temperature, both the strength and deformation of the skarn increase with the increase of impact pressure, showing obvious strain rate effect. With the increase of impact pressure or temperature, the crushing degree of the skarn becomes more and more intense, and the fragmentation becomes smaller and smaller, and especially smaller particles are mainly crushed at 800℃. The change of internal composition and structure is the main reason for the change of mechanical properties of the skarn. The brittle failure of the skarn is mainly transgranular and intergranular fracture at 25℃ ~ 400℃. 400℃ ~ 600℃ is the threshold temperature range of skarn transformation from brittle to plastic. When the temperature degree is up to 600℃ ~ 800℃, it transforms into dimple and slip fracture.
- skarn /
- high temperature /
- shpb /
- dynamic mechanical property /
- microscopic damage characteristic

HTML全文

图 1 SHPB试验装置

Figure 1. SHPB experimental device

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图 2 JSM-6510钨丝扫描电镜

Figure 2. JSM-6510 tungsten wire SEM

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图 3 XRD衍射仪

Figure 3. XRD diffractometer

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图 4 SHPB试验应力波传播示意图

Figure 4. Propagation of stress wave in SHPB experiments

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图 5 典型动态应力平衡曲线

Figure 5. Typical equalization curves of dynamic stress

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图 6 矽卡岩动态应力–应变曲线

Figure 6. Dynamic stress-strain curves of skarn

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图 7 矽卡岩动态抗压强度-温度变化规律

Figure 7. Variation in dynamic strength with temperature of skarn

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图 8 矽卡岩动态弹性模量-温度变化规律

Figure 8. Variation laws of dynamic elastic modulus temperature

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图 9 不同冲击气压下矽卡岩破坏形态

Figure 9. Failure patterns of skarn under different impact pressures

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图 10 XRD物相特征衍射图谱

Figure 10. Patterns of XRD phase characteristic diffraction

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图 11 不同温度等级矽卡岩主要物相成分衍射强度

Figure 11. Diffraction intensities of main phase components at different temperature levels

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图 12 扫描电镜（SEM）观测图像

Figure 12. SEM images

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表 1 动态冲击压缩试验结果

Table 1 Test results of skarn samples under dynamic impact compression

试件编号	温度/℃	冲击气压/MPa	冲击速率/(m·s^-1)	应变率/s^-1	峰值应变ε	动态抗压强度/MPa	割线模量/GPa
DY-0.8-1	25	0.8	7.73	24	0.0047	263.75	32.25
DY-0.8-4	200	0.8	7.73	81.68	0.0061	239.79	21.01
DY-0.8-7	400	0.8	7.73	72.85	0.0094	165.76	8.02
DY-0.8-10	600	0.8	7.73	97.13	0.0078	105.13	4.38
DY-0.8-13	800	0.8	7.73	117.21	0.0133	42.21	5.44
DY-1.0-16	25	1.0	8.44	44.58	0.0051	295.41	46.78
DY-1.0-19	200	1.0	8.44	83.89	0.0067	291.76	22.49
DY-1.0-22	400	1.0	8.44	105.92	0.0111	200.45	9.79
DY-1.0-25	600	1.0	8.44	147.91	0.0124	121.32	5.28
DY-1.0-28	800	1.0	8.44	152.32	0.0138	63.18	4.72
DY-1.2-31	25	1.2	9.28	52.98	0.0053	348.15	58.18
DY-1.2-34	200	1.2	9.28	101.55	0.0067	350.86	27.64
DY-1.2-37	400	1.2	9.28	143.49	0.0124	221.55	12.13
DY-1.2-40	600	1.2	9.28	158.94	0.0143	131.87	4.98
DY-1.2-43	800	1.2	9.28	165.57	0.0157	68.57	4.84
注：DY代表动载冲击压缩试验；0.8，1.0和1.2分别代表相应的气压。

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