SHPB冲击作用下层状千枚岩多尺度破坏机理研究

武仁杰; 李海波

doi:10.11883/bzycj-2019-0187

SHPB冲击作用下层状千枚岩多尺度破坏机理研究

doi: 10.11883/bzycj-2019-0187

武仁杰^{1, 2,},
李海波^{1, 2}

1.
中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，湖北武汉 430071
2.
中国科学院大学，北京 100049

基金项目: 国家自然科学基金（51439008，51679231）

详细信息

作者简介:
武仁杰(1994－　)，男，博士研究生，wu_renjie440@126.com

中图分类号: O347.3
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- 被引次数: 0
出版历程
- 收稿日期: 2019-04-30
- 修回日期: 2019-05-23
- 网络出版日期: 2019-07-25
- 刊出日期: 2019-08-01

Multi-scale failure mechanism analysis of layered phyllite subject to impact loading

WU Renjie^{1, 2
,},
LI Haibo^{1, 2}

1.
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 通过分离式霍普金森杆对层状千枚岩施加动态载荷，得到不同层理倾角下层状千枚岩的动态抗压强度与宏观破坏模式。采用三维激光仪获得断裂面细观形貌，引入分形几何定量计算断口面粗糙度；结合SEM观察到的微观尺度下不同层理倾角断口破坏机理，分析了不同层理倾角下层状岩石的动态破坏机制。研究结果表明：动态压缩下层理弱面对岩石的抗压强度影响较大；不同层理倾角千枚岩的断口形貌分形维数随层理倾角增大呈U型变化；从强度与裂纹扩展两方面考虑层理弱面对层状岩石破坏特征的影响，对于层理倾角为0°的试样，强度由岩石基质控制，但层理弱面仍对岩石破坏的裂纹分布与走向产生较大影响；对于层理倾角为22.5°的试样，强度与裂纹走向受岩石基质与层理弱面共同控制；对于层理倾角为45°～67.5°的试样，强度与裂纹走向受层理弱面控制；而对于层理倾角为90°的试样，动态抗压强度受岩石基质的影响较大，在层理弱面较早形成纵向宏观裂纹，导致该层理弱面角度下裂纹受层理弱面的影响较大。
- 冲击载荷 /
- 层状千枚岩 /
- 多尺度 /
- 分形维数
Abstract: The dynamic compressive strength characteristics and macroscopic failure modes of layered phyllite are carried out by the Split Hopkinson Pressure Bar. The micromorphology of fracture surface was obtained by 3D laser instrument, and the fractal geometry was introduced to quantitatively describe the roughness of fracture surface. Based on the fracture mechanism observed by SEM, the dynamic failure mechanism of layered rock with different bedding angles is analyzed. The results indicate that the weak bedding plane has a great influence on the dynamic compressive strength of layered rock. The fractal dimension of layered phyllite changes in U-shape with the increase of bedding angle. The influence of bedding plane on the failure characteristics of layered rocks is examined according to strength and crack propagation. For specimens with bedding angle of 0°, the failure strength is controlled by rock matrix, but the weak bedding plane still has a large impact on the distribution and trend of cracks in rock failure. For specimens with bedding angle of 22.5°, strength and direction of cracks are controlled by both the rock matrix and weak bedding plane. For specimens with bedding dip angle ranging from 45° to 67.5°, strength and direction of cracks are controlled by weak bedding plane. For the bedding angle of 90°, the dynamic compressive strength of the specimen is affected by the rock matrix, and longitudinal macro-cracks are formed early on the weak plane of the bedding, which results in that the cracks are greatly affected by the bedding plane.
- impact loads /
- layered phyllite /
- multi-scale /
- fractal dimension

HTML全文

图 1 层状千枚岩微观结构

Figure 1. Microstructure of layered phyllite

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图 2 层状千枚岩层理弱面倾角

Figure 2. Bedding angle of layered phyllite

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图 3 SHPB试验系统^[15]

Figure 3. SHPB test system^[15]

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图 4 层状千枚岩动态冲击试验应变率时程结果

Figure 4. Test results of strain rate history according to layered phyllite dynamic impact

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图 6 层状千枚岩动态冲击试验所得破坏形态

Figure 6. Typical macroscopic fractured modes of layered phyllite dynamic impact test results

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图 5 层状千枚岩动态冲击典型应力应变曲线

Figure 5. Typical stress-stain curve of layered phyllite dynamic impact test

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图 7 三维激光扫描仪形貌采集

Figure 7. Image acquisition of three-dimensional laser scanner

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图 8 不同层理弱面千枚岩三维形貌图

Figure 8. 3D mesoscopic graphs of phyllites with different bedding angle

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图 9 不同层理角度弱面千枚岩断口形貌分形维数

Figure 9. Fractal dimension of fracture surface for phyllite with different bedding angles

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图 10 分形维数随层理倾角的变化

Figure 10. Fractal dimension of different bedding angle

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图 11 不同层理弱面的千枚岩断口SEM图片

Figure 11. SEM images of the fracture surfaces for phyllite with different bedding angle

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图 12 波浪形台阶及层间撕裂形成示意图^[16]

Figure 12. Schematic diagram of the formation of wavy steps and interlayer tear^[16]

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表 1 SHPB试验结果

Table 1. Experimental results of SHPB tests

层理倾角/(°)	冲击速度/(m∙s⁻¹)	应变率/s⁻¹	峰值应变率/s⁻¹	峰值应力/MPa
0	14.82	80.18	114.54	247.95
0	14.97	88.35	118.96	254.47
0	14.86	82.28	123.84	241.75
22.5	14.82	91.43	120.64	215.64
22.5	14.96	97.39	127.95	221.35
22.5	14.79	94.48	130.14	206.74
45	14.97	136.73	173.88	148.42
45	14.84	132.50	166.84	142.86
45	14.89	129.95	161.29	138.24
67.5	14.72	140.09	178.73	121.89
67.5	14.74	135.73	173.38	118.83
67.5	14.94	141.48	184.87	126.89
90	14.83	134.60	172.64	185.90
90	14.85	136.95	176.95	197.73
90	14.98	130.74	163.10	177.43

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