动载作用下锚固体动态失稳试验研究

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Abstract To elucidate the dynamic instability mechanism of anchorage bodies under dynamic loads. This paper combines theoretical analysis and laboratory experiments to establish a theoretical model for dynamic instability of anchorage bodies under dynamic loads. A method for determining the critical instability strain rate and critical instability damage degree of anchorage bodies under dynamic loads were proposed. Dynamic load impact tests were conducted on anchorage bodies with different pretension forces and anchorage lengths. Critical instability strain rate，critical instability damage degree，and critical instability absorption energy of the anchorage body under dynamic loads were obtained. From the perspectives of stress，damage，and energy，the ability of pretension forces and anchorage lengths to resist dynamic load impacts on anchorage bodies were revealed. A Mohr stress circle analysis model for anchorage bodies was constructed to explore the mechanical mechanism of anchorage bodies resisting dynamic load impacts. The research results indicate that there is a critical instability threshold during the transition of the anchorage body from a complete state to an unstable failure state. The dynamic peak strength，critical instability strain rate，critical instability damage degree，and critical instability absorption energy of the anchorage body are positively correlated with the pretension force and anchorage length. The stability of the anchorage body under dynamic load were influenced by the diffusion range of its internal prestressing field and the overall compactness. The larger the diffusion range of the internal prestressing field and the higher the overall compactness of the anchorage body，the less damage to the matrix after dynamic loading. Increasing the pretension forces and extending the anchorage length are effective ways to enhance the anchoring body?s resistance to dynamic load impact.

Key words： rock mechanics dynamic loading 3D printing anchorage body instability energy

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	Articles by authors
	YANG Shang1
	NING Jianguo1
	2
	WANG Jun1
	2
	GAO Mingtao1
	3
	SHI Xinshuai1
	2
	ZHANG Zhaohui1

Cite this article:

YANG Shang1,NING Jianguo1,2, et al. Experimental study on dynamic instability of anchorage body under dynamic loading[J]. , 2025, 44(2): 409-426.

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https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I2/409

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