深埋隧洞板裂屈曲岩爆机制及物理模拟试验研究

doi:10.13722/j.cnki.jrme.2014.0874

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Abstract

With combination of typical rockburst cases happened in deep tunnels of Jinping II hydropower station，formation mechanism and function mechanism of structural plane of slab buckling rockburst were analyzed. The research shows that slabbing failure of surrounding rock is caused by excavation unloading and the action of the tangential concentrated stress will lead to the buckling deformation of slabs towards the excavation space as well as growing strain energy stored in the slabs. When the amount of energy stored in the slabbing rock structure exceeds its energy storage limitation，or due to external disturbances，slab buckling rockburs will take place with the characteristics of crushing of slabs and ejection of rock. The gradual failure process of slabbing failure makes the structural planes be active. The existence and extension of structural planes will reduce the stability of slabbing rock structure which in turn promotes the occurrence of rockburst. The structural planes with different inclination angles play different roles in the formation of slab buckling rockburst. Slabbing specimens were made according to the architectural feature of slabbing surrounding rock and physical simulation tests of slab buckling rockburst were conducted under two different loading modes. The experiment results show that propagation of pre-existing fissures makes the specimens split into slabs，and further action of compression load cause buckling deformation of slabs towards the free face which leads to the instability destruction phenomenon of specimens characterized by crushing of slabs and ejection of rock. The research results have an important significance for understanding and support control of slab buckling rockburst.

Key words： rock mechanics deep tunnel slab buckling rockburst formation mechanism mechanism of structural plane physical simulation test

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	Articles by authors
	ZHOU Hui1
	XU Rongchao2
	LU Jingjing1
	ZHANG Chuanqing1
	MENG Fanzhen1
	SHEN Zheng1

Cite this article:

ZHOU Hui1,XU Rongchao2,LU Jingjing1, et al. STUDY ON MECHANISMS AND PHYSICAL SIMULATION EXPERIMENT OF SLAB BUCKLING ROCKBURST IN DEEP TUNNEL[J]. , 2015, 34(S2): 3658-3666.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.0874 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/IS2/3658

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