高气压冲击下废弃矿硐围岩动态力学响应研究

doi:10.3724/1000-6915.jrme.2025.0575

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Abstract To assess the suitability and safety of surrounding rocks in abandoned mines for Compressed-Air Energy Storage (CAES) projects, this study examines the abandoned iron ore mine located in the eastern part of the Nalengele River in Qinghai Province, China. It systematically analyzes the engineering geological features and static-dynamic mechanical behaviors of the rocks. Researchers employed digital image correlation (DIC), Split Hopkinson Pressure Bar (SHPB) tests, and ultra-high-speed photography to accurately characterize the dynamic responses and failure mechanisms of three key rock types: granite, marble, and skarn. The results reveal distinct differences in static properties; both granite and skarn exhibit high elastic moduli and a significant potential for rockburst. Under dynamic impact, all rock types follow a consistent pattern of strength enhancement, fracture evolution, and energy dissipation. Dynamic compressive strength and elastic modulus increase sharply with strain rate, and the dynamic increase factor (DIF) shows a linear correlation with the logarithm of the strain rate. As the strain rate rises, crack propagation accelerates, transitioning macrocrack forms from tensile to shear dominance. Specifically, granite demonstrates limited strength growth, characterized by rapid through-going linear fractures that primarily convert energy to crack expansion and debris, resulting in low energy absorption efficiency. Marble exhibits the most substantial increase (DIF ranging from 1.70 to 3.45), with restricted, winding cracks facilitating top energy dissipation. Skarn presents intermediate characteristics, featuring irregular cracks and plastic failure following ductile slip, with moderate energy dissipation. At an impact air pressure of 0.30 MPa, granite and skarn display the phenomenon of “failure strain saturation,” where the slope of the peak strain relative to the increasing strain rate is less than 0.05, indicating saturation, and the strain response ceases to increase significantly with rising air pressure. In contrast, marble continues to demonstrate excellent energy absorption and buffering capacity. These insights provide essential theoretical and practical guidance for site selection, air pressure thresholds, and rock stability in abandoned-mine CAES projects.

Key words： rock mechanics abandoned mine compressed air energy storage dynamic mechanical properties SHPB failure strain saturation energy partitioning

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	Articles by authors
	LIU Shuzhong1
	YANG Xiaolin1
	2
	3
	WANG Longxuan1
	ZHANG Wen1
	2
	3*
	ZHANG Bin4
	5
	WANG Hanxun4
	5
	CONG Xiaoming6
	LONG Yongkang1

Cite this article:

LIU Shuzhong1,YANG Xiaolin1,2, et al. Dynamic mechanical responses of surrounding rock in abandoned mine caverns under high-pressure impacts[J]. , 2026, 45(4): 1162-1182.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0575 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/I4/1162

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