胶结充填体超声波波速损伤演化试验

Experimental Study on Damage Evolution of Cemented Backfill Based on Ultrasonic Wave Velocity

胶结充填体在荷载作用下的损伤演化规律对其稳定性控制具有重要意义。为了研究胶结充填体损伤演化规律,运用损伤力学理论,构建基于超声波波速的胶结充填体损伤演化方程;结合超声波监测试验,研究胶结充填体在荷载作用下损伤演化与超声波波速之间的关系;通过声发射试验,结合试验所得声发射能量以及振铃次数,验证胶结充填体在荷载作用下的损伤演化规律。研究表明:胶结充填体的超声波波速值曲线、损伤值曲线以及基于声发射的能量、振铃次数曲线均与应力—应变曲线变化规律吻合,基于超声波波速的胶结充填体损伤演化方程能较好地表征充填体损伤演化规律。研究结果可为胶结充填体矿柱的稳定性控制提供理论指导。

The damage evolution rule of cemented backfill has great significance for its stability control under load. In order to study the damage evolution law of cemented backfills,the damage mechanics theory was used to construct the damage evolution equations of cemented backfills based on the ultrasonic wave velocity;The relationship between the damage evolution and the ultrasonic wave velocity of the cemented backfill under load was studied by the ultrasonic monitoring test;The acoustic emission test,combined with the energy and ringing times of acoustic emission obtained during the test,verified the damage evolution of cemented backfill under load. The results show that the ultrasonic wave velocity curve,damage curve,acoustic emission-based energy and ringing frequency curve of cemented backfill are consistent with the stress-strain curve,and the damage evolution equation of cemented backfill based on ultrasonic wave velocity can better characterize the damage evolution rules of backfills. The results can provide theoretical guidance for stability control of cemented backfill pillars.