圆形硐室岩爆临界应力研究

doi:10.3724/1000-6915.jrme.2024.0965

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Abstract Rockburst is a dynamic disaster characterized by the sudden instability and violent fracturing of chambers under high-stress conditions, with the critical stress serving as the most pivotal indicator. In this study, the maximum load criterion and the maximum potential energy criterion for the occurrence of rockbursts in chambers were proposed, and the theoretical critical stress formulas for rockbursts in circular chambers under hydrostatic pressure were derived. The discrepancy in critical stress derived from the two discrimination criteria is less than 2%. This study indicated that the critical stress was mainly influenced by uniaxial compressive strength, rockburst energy index, internal friction angle, and support stress. The biaxial isobaric loading experiments were conducted on circular chamber specimens of granite gneiss and basalt with dimensions of 150 mm× 150 mm× 50 mm. The average error between the experimental and theoretical values of the critical stress was 2.53%. Comparative analysis with field cases revealed an average ratio of 0.55 between actual stress and critical stress, prompting subsequent refinement of the formula. The application of the critical stress formula was discussed from the aspects of hazard assessment, prevention design, and safety evaluation of chamber rockbursts.

Key words： rock mechanics rockburst circular cavern critical stress rockburst energy index maximum load and maximum potential energy

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	PAN Yishan1
	2
	GAO Xuepeng1

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PAN Yishan1,2,GAO Xuepeng1. Study on critical stress of circular chamber rockburst[J]. , 2025, 44(6): 1363-1376.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0965 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I6/1363

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