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 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.

Automated summary

The spatial localization of damage evolution caused by fiber-reinforced backfill is critical for predicting rupture location in mining area filling. Through AE three-dimensional localization tests, the damage evolution process and characteristics of fiber-reinforced backfills were studied. The evolution of spatial distribution of AE events not only reflects the spatial location of damage during the loading process but also determines the degree of damage at a certain location based on spatial point density. These results provide a theoretical basis for predicting rupture localization in mine filling.