On acoustic emission characteristics, initiation crack intensity, and damage evolution of cement-paste backfill under uniaxial compression

Micro-Mechanism of Uniaxial Compression Damage of Layered Cemented Backfill in Underground Mine

“…Then a certain number of cement particles were randomly generated between the tailing particles. In order to make the force of the model closer to the actual strength of the filling body sample, the parallel bond model was adopted between the particles [34,35]. The four-layer horizontal filling body was taken as an example to establish its numerical model, which is shown in Figure 3, through the bond transfer force and moment between particles and smooth bonding between layers.…”

“…The above studies mainly focused on the complete filling body, and with the consumption of external mineral resources, deep mining has gradually become the mainstream mining trend [ 30 , 31 ]. The development of deep mining technology is accompanied by the rapid increase in the number and size of goaf [ 32 , 33 , 34 , 35 , 36 , 37 ]. Limited by the current domestic filling technology, it is almost impossible to fill large-scale mined-out areas once, which leads to the stratification of the filling body due to layer-by-layer filling [ 38 , 39 , 40 , 41 ].…”

Assessment of fracture process of engineered cementitious composite (ECC) by time-frequency analysis of acoustic emission signals

“…Various non-destructive evaluation approaches have been developed to assess material damages based on sound waves [11][12][13][14], electromagnetic waves [15,16], optical scan [17], and fiber optic sensors [18][19][20]. Acoustic emission (AE) approaches were employed to assess damage evolution in fiber-reinforced concrete [21] and fiber-reinforced polymers [22]. Effectiveness in the assessment of corrosion [23], freezethaw damage [24], and cracks [13,[25][26][27][28][29] has been demonstrated.…”

Experimental study on the triaxial mechanical behaviors of the Cemented Paste Backfill: Effect of curing time, drainage conditions and curing temperature

“…on CPB's UCS was studied in detail (Cao and Song, 2017;Li and Fall;Hou et al, 2020). There were also a number of UCS related studies on CPB including but not limited to: the digital image correlation (DIC) (Xiu et al, 2020), acoustic emission (AE) (Zhou et al, 2020;Zhao et al, 2020), CT (Cao et al, 2021), ultrasonic pulse velocity (UPV) (Yilmaz et al, 2014;Ercikdi et al, 2016;Jiang et al, 2020), numerical simulation (Liu et al, 2017) and other advanced methods were also used to quantitatively analyze the damages of CPB structures. For backfilled CPB structures on site, the mechanical properties of CPB unit located at a given depth were also significantly affected by the lateral constraint stress (σ3).…”