Acoustic emission characteristics for filling body during tensile tests and its numerical simulation

The roof cemented backfill damage is affected by compressive strength and tensile failure in the underhand stoping with cemented filling process. Uniaxial tensile member damage tests are performed to monitor the whole process of cementing backfill test by using acoustic emission technique to explore cemented backfill roof tensile failure during the evolution of damage law. RFPA2D software is applied to simulate cemented filling on tensile failure and acoustic emission signals. The simulation results show consolidated cemented backfill in the tensile specimen is central disc with the loading axis direction appearing cracked initiation. Extension and gathered into macro fracture zone and eventually lead to the overall loss of failure process.The simulation results represent the distribution of acoustic emission during tensile failure with favorable consistency compared with indoor test results of acoustic emission characteristics. That can simulate the damage evolution more accurate rules when the tensile strength of cemented backfill damage by using the numerical simulation analysis software--RFPA2D. It provides a theoretical basis for using acoustic emission technology as the monitoring of consolidated filling body damage.