循环冲击荷载作用下单节理岩体的动态力学行为

循环冲击荷载作用下单节理岩体的动态力学行为

Dynamic mechanical behaviors of single-jointed rock mass under cyclic impact loadings

doi: 10.11883/bzycj-2024-0353

作者简介:
刘康琦（1996－　），男，博士研究生，lkq1104@126.com

通讯作者:
刘红岩（1975－　），男，博士，教授，lhy1204@cugb.edu.cn

刘康琦; 刘红岩; 周月智; 薛雷; 张光雄

doi:10.11883/bzycj-2024-0353

1.
中国地质大学（北京）工程技术学院，北京 100083
2.
中国科学院地质与地球物理研究所页岩气与地质工程重点实验室，北京 100029
3.
保利民爆哈密有限公司，新疆哈密 839200

基金项目: 国家科技重大专项（2024ZD1004106）；北京市自然科学基金（8222031）；新疆自治区天池英才引进计划（创新领军人才）

详细信息

中图分类号: O383
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- 文章访问数: 163
- HTML全文浏览量: 19
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- 被引次数: 0
出版历程
- 收稿日期: 2024-09-20
- 修回日期: 2024-12-23
- 网络出版日期: 2025-01-01

多节理岩体^[40]

多节理岩体^[40]

1.
School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China
2.
Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
3.
Poly Explosive Hami Co., Ltd., Hami 839200, Xinjiang, China

摘要

摘要: 为探究节理岩体在循环动力扰动作用下的动态力学行为，采用分离式霍普金森压杆试验系统，对含单节理辉长岩试件进行了单轴循环冲击试验，从试件的抗冲击能力、应力应变性质、能量和损伤的演化对其动态力学行为进行了全面分析。结果表明，试件在循环冲击作用下的破坏模式为劈裂，节理倾角显著影响试件的抗冲击能力；试件在循环冲击过程中均出现了应变回弹现象，其力学性质并不随着冲击次数的增加而单调弱化；用耗散能表示的累积损伤系数随着冲击次数的增加近似线性增大，增幅随节理倾角的增大而减小。在低应力冲击作用下，单节理试件内的压剪应力不足以产生剪切裂纹，试件的破坏主要是由拉应力引起的张拉裂纹逐渐扩展并与节理相互贯通造成的。多节理岩体与单节理岩体的破坏机理类似，在循环冲击过程中会同时出现微缺陷的压密和节理处微裂纹的萌生，然而裂纹是否能使试件内的节理相互贯通影响了多节理试件的抗冲击能力，对于完整岩石试件，则是先出现微缺陷的压密，随后微裂纹以概率分布的形式被激活，最终导致试件破坏。
- 单节理岩体 /
- 循环冲击 /
- 能量耗散 /
- 累积损伤 /
- 破坏机理
Abstract: In practical engineering, rock frequently suffers from recurrent dynamic disturbances, posing serious threats to engineering safety. To investigate the dynamic mechanical behavior of jointed rock under cyclic dynamic disturbances, cyclic impact tests of single-jointed gabbro (SJG) were conducted using a split Hopkinson pressure bar (SHPB) test system. The stress equilibrium during the tests was verified using the three-wave method and the force balance coefficient method. The dynamic mechanical behavior of the specimens was comprehensively analyzed in terms of impact resistance, stress-strain relationships, energy and damage evolution, as well as dynamic failure mechanisms. The results show that single-jointed rock specimens can achieve stress equilibrium under cyclic impact conditions. The failure mode of the specimens under cyclic impacts is splitting, and the joint inclination angle significantly influences the impact resistance of the specimens. As the joint inclination angle increases, the impact resistance of the specimens also increases. During the cyclic impact process, strain rebound occurs in all specimens, and their mechanical properties do not monotonically degrade with an increasing number of impacts. The peak stress of the specimens generally exhibits a decreasing trend with the number of impacts. The cumulative damage coefficient, represented by dissipated energy, increases approximately linearly with the number of impacts, while the increase rate decreases with larger joint inclination angles. Under low-stress impact loading, the compressive-shear stress within single-jointed specimens is insufficient to generate shear cracks. The failure of specimens primarily results from the progressive propagation of tensile cracks induced by tensile stress, which eventually coalesce with the joint. The failure mechanism of multi-jointed rock masses resembles that of single-jointed rock masses. During cyclic impact loading, both compaction of micro-defects and initiation of micro-cracks at joints occur simultaneously. However, the impact resistance of multi-jointed specimens depends on whether the cracks can interconnect the joints. For intact rock specimens, the failure process initially involves compaction of micro-defects, followed by probabilistic activation of micro-cracks, ultimately leading to specimen failure.
- single-jointed rock mass /
- cyclic impact loading /
- energy dissipation /
- cumulative damage /
- failure mechanisms

HTML全文

图 1 辉长岩试件切片的偏光显微镜照片

Figure 1. Polarizing microscope photo of the gabbro specimen section

下载: 全尺寸图片幻灯片

图 2 单节理辉长岩试件的几何示意图和照片

Figure 2. Geometric schematic and photos of single-jointed gabbro specimens

下载: 全尺寸图片幻灯片

图 3 SHPB试验系统

Figure 3. An SHPB test system

下载: 全尺寸图片幻灯片

图 4 试件SJG-0-3第2次冲击应力平衡验证

Figure 4. Stress equilibrium verification of specimen SJG-0-3 under the second impact

下载: 全尺寸图片幻灯片

图 5 试件SJG-45-1第3次冲击应力平衡验证

Figure 5. Stress equilibrium verification of specimen SJG-45-1 under the third impact

下载: 全尺寸图片幻灯片

图 6 试件SJG-60-3第7次冲击应力平衡验证

Figure 6. Stress equilibrium verification of specimen SJG-60-3 under the seventh impact

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图 7 试件SJG-90-1第14次冲击应力平衡验证

Figure 7. Stress equilibrium verification of specimen SJG-90-1 under the fourteenth impact

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图 8 试件SJG-0-3的动态应力-应变曲线

Figure 8. Dynamical stress-strain curves of specimen SJG-0-3

下载: 全尺寸图片幻灯片

图 9 试件SJG-30-2的动态应力-应变曲线

Figure 9. Dynamical stress-strain curves of specimen SJG-30-2

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图 10 试件SJG-45-1的动态应力-应变曲线

Figure 10. Dynamical stress-strain curves of specimen SJG-45-1

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图 11 试件SJG-60-3的动态应力-应变曲线

Figure 11. Dynamical stress-strain curves of specimen SJG-60-3

下载: 全尺寸图片幻灯片

图 12 试件SJG-90-1的动态应力-应变曲线

Figure 12. Dynamical stress-strain curves of specimen SJG-90-1

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图 13 循环冲击作用下单节理岩体试件的峰值应力与冲击次数的关系

Figure 13. Relationship between peak stress and impact number of single-jointed gabbro specimens under cyclic impact

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图 14 试件SJG-60-3的能量、应变率和应变随时间的变化

Figure 14. Energy-, strain-, and strain rate-time history curves of specimen SJG-60-3

下载: 全尺寸图片幻灯片

图 15 由能量计算得到的损伤变量与冲击次数的关系

Figure 15. Relationship between damage variable calculated by energy and impact number

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图 16 节理表面正应力与节理倾角的关系

Figure 16. Relationship between normal stress of joint surface and joint inclination angle

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表 1 试验结果

Table 1. Experiment results

试件	气压/MPa	平均入射应力/MPa	最终状态	试件	气压/MPa	平均入射应力/MPa	冲击次数	最终状态
SJG-0-1	0.12	249	劈裂	SJG-60-1	0.13	275	7	劈裂
SJG-0-2	0.13	275	劈裂	SJG-60-2	0.13	275	8	劈裂
SJG-0-3	0.13	275	劈裂	SJG-60-3	0.13	275	8	劈裂
SJG-30-1	0.12	249	未破坏	SJG-90-1	0.13	275	14	劈裂
SJG-30-2	0.13	275	劈裂	SJG-90-2	0.13	275	15	劈裂
SJG-30-3	0.13	275	劈裂	SJG-90-3	0.13	275	10	劈裂
SJG-45-1	0.13	275	劈裂	完整	0.13	275	50	未破坏
SJG-45-2	0.13	275	劈裂
SJG-45-3	0.13	275	劈裂

下载: 导出CSV

表 2 节理岩体试件的破坏模式

Table 2. Failure modes of jointed gabbro specimens

下载: 导出CSV

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