应变型岩爆模型试验及其力学机制研究

doi:10.13722/j.cnki.jrme.2018.0266

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Abstract To study the initiation mechanism of strain rockbursts，model tests on strain rockbursts induced by unloading in deep underground opening were conducted based on elastic adaptive boundary. The phenomena of strain rockbursts were reproduced in the laboratory. At the distances of 2 cm and 8 cm from the tunnel wall，the hoop pressure values of the surrounding rock increase by 63.3% and 42.9% respectively，and the radial pressure values decrease by 79.2% and 29.3% respectively. The maximum values of the radial and hoop strains，2 cm away from the tunnel wall，reach －2 443 and 1 268 respectively. The convergences at the vertical，left and right sides of the wall in the tunnel after excavation are respectively 0.37 mm，0.53 mm and 0.55 mm. In the process，brittle failure phenomena of the surrounding rock including block-fracture and strain rockburst were observed，and the failure of the surrounding rock displayed an obvious lag effect. The mechanism of strain rockbursts was established. The test method can simulate strain rockburst phenomenon well，and the study conclusions can provide a reference for further theoretical study and engineering practice of rockbursts.

Key words： rock mechanics strain rockbursts elastic adaptive boundary model test mechanical mechanism deep rock mass

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	Articles by authors
	LI Lang1
	JIANG Haiming2
	CHEN Xianbo1
	LUO Zhongxing1

Cite this article:

LI Lang1,JIANG Haiming2,CHEN Xianbo1, et al. Model test study on the mechanical mechanism of strain rockbursts[J]. , 2018, 37(12): 2733-2741.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0266 OR http://www.rockmech.org/EN/Y2018/V37/I12/2733

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