高应力硐室围岩三轴蠕变及声发射特征研究

doi:10.13722/j.cnki.jrme.2022.0642

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Abstract Aiming at the long-term deformation of the surrounding rock in the underground rock engineering under the high-stress condition，the triaxial creep tests and real-time acoustic emission monitoring were performed on the marble samples that taken from a high-stress underground engineering by the MTS815 Flex Text GT and PCI–II Acoustic Emission Monitoring System. And the creep mechanical properties and acoustic emission characteristics of the marble were investigated. The results demonstrate that the stress-strain curve comprises five stages throughout the entire process of multi-level creep of marble showing the brittle failure property. Meanwhile，it is noticed that the lateral deformation has more significant creep features than the axial deformation. The acoustic emission shows a clear stress response characteristics and time-dependent effect，which matches the typical three stages of creep. The acoustic emission ringing count rate and energy rate linearly increase in the initial and steady creep stages，while exponentially increase during the accelerated creep stage. Furthermore，the time point corresponding to the change of acoustic emission characteristics is earlier than the strain acceleration point，which can be used to predict the creep damage in marble. Based on the characteristics of internal microcrack development in marble defined by AF and RA values，the creep damage of marble is the result of a combination of tensile and shear damage.

Key words： rock mechanics marble triaxial creep lateral creep acoustic emission failure mode

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	Articles by authors
	HE An1
	WANG Lu1
	2
	CHENG Haoyu1
	YANG Shuyu1

Cite this article:

HE An1,WANG Lu1,2, et al. Study on triaxial creep and acoustic emission characteristics of surrounding rock under high-stress condition#br#[J]. , 2023, 42(S1): 3367-3376.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0642 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3367

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