Damage evolution process of fiber-reinforced backfill based on acoustic emission three-dimensional localization

The spatial localization of the damage evolution caused by a fiber-reinforced backfill is critical for the prediction of the rupture location in a mining area filling. Acoustic emission (AE) three-dimensional localization tests under uniaxial compression were conducted on various fiber-reinforced ba...

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Veröffentlicht in:Composite structures 2023-04, Vol.309, p.116723, Article 116723
Hauptverfasser: Zhao, Kang, Yang, Jian, Yu, Xiang, Yan, Yajing, Zhao, Kangqi, Lai, Yanming, Wu, Jun
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Sprache:eng
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Zusammenfassung:The spatial localization of the damage evolution caused by a fiber-reinforced backfill is critical for the prediction of the rupture location in a mining area filling. Acoustic emission (AE) three-dimensional localization tests under uniaxial compression were conducted on various fiber-reinforced backfills to study the damage evolution process. The general characteristics of energy count and the law of evolution for the spatial localization damage of fiber-reinforced backfills were derived by analyzing the time sequence evolution process of energy count and the spatial distribution of the AE events. The results show that the time-series evolution process of the backfill energy count can be approximately divided into the three periods: rising, quiet, and active. The damage mode of the fiber-reinforced backfill in uniaxial compression is determined as ductile damage, and the penetration mode is determined as shear + tension penetration. The evolution of the spatial distribution of the AE events of a backfill can not only reflect the spatial location of damage during the entire loading process but also determine the degree of damage at a certain location according to the density of spatial points. The results of this study can provide a theoretical basis for the prediction of rupture localization for mine filling.
ISSN:0263-8223
1879-1085
DOI:10.1016/j.compstruct.2023.116723