CAJ | 학술논문

为获取钨矿砂岩矿柱岩石破坏过程中声发射特性及损伤演化规律，对其进行单轴压缩条件下同步测试应力-应变曲线、声发射参数-时间变化曲线的室内声发射试验，通过分析声发射参数与应力变化关系，并试用声发射振铃计数、能量计数来表征岩石损伤。结果表明：该岩石的声发射分布可分为三个不同阶段；第Ⅰ阶段为相对平静期，振铃计数较小、幅值较小，能量释放值较低；第Ⅱ阶段为活跃期，声发射活动分布逐渐密集，但大多数信号值都处于低级别水平，岩石仍处于稳定阶段；第Ⅲ阶段为失稳前兆期，振铃计数、幅值均值和弹性能释放迅速增大，且分布更为密集，出现多个峰值，峰值处都对应着应力-应变曲线上的拐点，岩石失稳时各声发射参数都达到最大值。用声发射振铃计数或能量计数能较好的反应岩石内部的损伤演化过程。
위획취오광사암광주암석파배과정중성발사특성급손상연화규률，대기진행단축압축조건하동보측시응력-응변곡선、성발사삼수-시간변화곡선적실내성발사시험，통과분석성발사삼수여응력변화관계，병시용성발사진령계수、능량계수래표정암석손상。결과표명：해암석적성발사분포가분위삼개불동계단；제Ⅰ계단위상대평정기，진령계수교소、폭치교소，능량석방치교저；제Ⅱ계단위활약기，성발사활동분포축점밀집，단대다수신호치도처우저급별수평，암석잉처우은정계단；제Ⅲ계단위실은전조기，진령계수、폭치균치화탄성능석방신속증대，차분포경위밀집，출현다개봉치，봉치처도대응착응력-응변곡선상적괴점，암석실은시각성발사삼수도체도최대치。용성발사진령계수혹능량계수능교호적반응암석내부적손상연화과정。
Indoor acoustic emission tests were performed measuring the stress-strain curve and acoustic emission parameters-time curve under uniaxial compression conditions to obtain acoustic emission characteristics and damage evolution rules during the damaging process of tungsten ore rock column. Rock damage is characterized by ringing acoustic emission count and energy count by analyzing the variation relation between AE parameters and stress. The results show that the acoustic emission distribution can be classified into 3 different stages. The first stage is relative calm period with low ringing count, amplitude and energy emission. The second stage is active period with intensive acoustic emission activity distribution. However, most of the signal values remain at the low level with stable rock stage. The third stage is precursory stage of stability loss with gradual increasing ringing count, mean amplitude and elastic energy releases. The multi-peak existence correspond with the turning points of stress-strain curve. The AE parameters reach the maximum during unstable rock state. Ringing with acoustic emission count or energy can favorably reflect the damage evolution process inside the rock.