Experimental and theoretical investigation of roadway fracture induced by static-blast loading using acoustic emission

Si, Ying-tao; Liu, Jianpo; Lic, Fengtian; Shi, Hong-xu; Yan, Guangliang; Song, Jiancun; Zhang, Changyin

doi:10.1016/j.engfailanal.2022.106909

Cited by 5 publications

(1 citation statement)

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“…Underground mining destroys the equilibrium of any in-situ stress field, resulting in increasing tangential stress in surrounding rock near a goaf, decreasing radial stress, and stress concentration within a certain range into the rock surrounding the goaf. With the continuous advance of the working face, the stress in rock mass around the goaf is constantly redistributed, and the rock surrounding a roadway near a stope can be subjected to complicated loading and unloading stresses [1][2][3]. Weak planes, such as microcracks, fractures, and joints in surrounding rock can gradually coalesce to form macrocracks; moreover, damage to the rock mass accumulates, thus weakening its mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Spatio-temporal evolution of acoustic emission events and initiation of stress fields in the fracturing of rock mass around a roadway under cyclic high-stress loading

Lei,

Wu,

Zhu

2023

PLoS ONE

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To study fracture mechanisms and initiation of stress fields in the rock mass around a roadway subjected to cyclic stress, a series of loading and unloading tests were conducted on the rock mass around the roadway by using high-precision acoustic emission (AE) monitoring. The results show that intense AE activities occur in a specimen during cyclic load-holding at different levels. With the increase in the number of cycles, the overall stability of the specimen gradually decreases. In the cyclic loading and unloading process, the specimen exhibits a Kaiser effect. As the number of cycles increases, more AE events occur in the unloading stage and a Felicity effect is manifest. The spatial distribution of AE events is related to the stress regime and structure of the specimen, crack propagation in the roadway exhibits directionality due to effects of the principal stress. High stress is conducive to microcrack initiation and propagation in the specimen, which accelerates damage accumulation and macrofracture formation in a rock mass. The research provides a reference for roadway support work and disaster prevention and control in deep mines.

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Section: Introductionmentioning

confidence: 99%