Experimental Study on Dynamic Mechanical Behavior of Fully-Penetrating Cross-Jointed Rocks Under Biaxial Static-Dynamic Loading

IF 2.4 3区工程技术 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Experimental Mechanics Pub Date : 2026-03-13 DOI:10.1007/s11340-026-01268-4

X. Xiaokun, X. Yifan, S. Shaoshuai, R. Xiaoli, W. Weitao, P. Jiangzhou, H. Jie

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引用次数: 0

Abstract

Background

The jointed rock mass near the tunnel face is subjected to a biaxial stress state prior to blasting excavation, and its dynamic response is significantly influenced by the joint structure. However, existing research has been limited in its ability to reveal the fracture and ejection mechanisms of fully-penetrating cross-jointed rock under biaxial static-dynamic coupled loads, which consequently hampers the accurate prediction and effective prevention of related disasters.

Objective

This study aims to develop an integrated experimental mechanics approach to reveal the dynamic response characteristics and fracture-ejection evolution mechanism of fully-penetrating cross-jointed rocks under biaxial static-dynamic coupled loading.

Methods

A biaxial Hopkinson bar system was used to apply static-dynamic coupled loading to a fully penetrating cross-jointed rock specimen, and its dynamic mechanical response under different stress paths was systematically studied. The digital image correlation (DIC) technique was used to capture the crack evolution and rock block movement in real time, revealing the fracture-ejection behavior.

Results

The dynamic peak strength of jointed rock increases significantly with the increase of intermediate principal stress. For example, when the loading rate is 4300 GPa/s and the \({\sigma }_{2}^{0}\) increases from 6 to 12 MPa, the dynamic peak stress of the jointed rock sample increases from 41.6 MPa to 107.6 MPa, but decreases with the increase of maximum principal stress, revealing the high sensitivity of jointed rock mass to stress path. The rock shell exhibits compression-slip-rotation coordinated deformation, revealing the continuous evolution mechanism of rupture-slip-ejection under joint control.

Conclusion

The proposed BHPB-DIC experimental methodology successfully verifies the synergistic regulatory effect of joint structure and stress path on the dynamic response of rock mass. The proposed experimental method and mechanistic understanding can provide a theoretical basis and experimental support for the identification of dynamic hazards in jointed rock mass.

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双轴静动加载下全贯通交叉节理岩石动态力学特性试验研究

巷道工作面附近节理岩体在爆破开挖前处于双轴应力状态，其动力响应受节理结构的显著影响。然而，现有研究在揭示双轴动静耦合载荷作用下全贯通交叉节理岩石的破裂和喷射机理方面存在局限性，影响了对相关灾害的准确预测和有效预防。目的建立综合实验力学方法，揭示双轴动静耦合加载下全贯通交叉节理岩石的动态响应特征及缝射演化机制。方法采用双轴Hopkinson杆系对全贯通交叉节理岩石试件施加动静耦合加载，系统研究不同应力路径下岩石的动态力学响应。采用数字图像相关（DIC）技术实时捕捉裂缝演化和块体运动，揭示裂缝喷射行为。结果节理岩体的动峰值强度随中间主应力的增大而显著增大。例如，当加载速率为4300 GPa/s， \({\sigma }_{2}^{0}\)从6增大到12 MPa时，节理岩体的动峰值应力从41.6 MPa增大到107.6 MPa，但随着最大主应力的增大而减小，显示出节理岩体对应力路径的高度敏感性。岩壳呈现压滑旋转协调变形，揭示了节理控制下破滑抛射的连续演化机制。结论提出的BHPB-DIC实验方法成功验证了节理结构和应力路径对岩体动力响应的协同调节作用。本文提出的实验方法和机理认识可为节理岩体动力危害的识别提供理论依据和实验支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experimental Mechanics 物理-材料科学：表征与测试

CiteScore

4.40

自引率

16.70%

发文量

111

审稿时长

3 months

期刊介绍： Experimental Mechanics is the official journal of the Society for Experimental Mechanics that publishes papers in all areas of experimentation including its theoretical and computational analysis. The journal covers research in design and implementation of novel or improved experiments to characterize materials, structures and systems. Articles extending the frontiers of experimental mechanics at large and small scales are particularly welcome. Coverage extends from research in solid and fluids mechanics to fields at the intersection of disciplines including physics, chemistry and biology. Development of new devices and technologies for metrology applications in a wide range of industrial sectors (e.g., manufacturing, high-performance materials, aerospace, information technology, medicine, energy and environmental technologies) is also covered.