Experimental Study on the Mechanical and Acoustic Characteristics of Cemented Backfill with Unclassified Tailings at Different Curing Ages under Uniaxial Compression

In order to study the influence of cement–tailing ratio and curing age on mechanical properties cemented backfill with unclassified tailings improve accuracy monitoring method, characteristics failure process at different ages were studied using acoustic emission infrasound method. The results show that peak strength modulus elasticity are positively correlated age. During tailings, ringing count shows a “stabilizing–rising–falling–rising” trend, infrasonic will have “multiple peak” phenomenon. ib value signal generally increases extension has negative correlation increase When wave all start decline in jumping manner, this indicates is about be damaged. dominant frequency signals (FAE) distributed between 0–4 during process, total number FAE phenomenon “first decreasing then increasing” (Fs) 0–6. quantity class A B gradually increasing “decreasing–increasing–decreasing” sharp stage entering crack’s unstable growth stage.