论文部分内容阅读
采用双轴伺服控制系统开展自然和饱和状态下的花岗岩岩爆模拟实验,同时采用美国物理声学公司生产的PCI-2型声发射系统监测并采集声发射数据,研究了水对巷道岩爆的影响。研究结果表明:含水的区别对应着不同的花岗岩岩爆实验中的声发射特性;饱和花岗岩比自然状态花岗岩颗粒弹射时间滞后;自然和饱和花岗岩均在轴向载荷达到峰值荷载的65%~80%时声发射事件进入平静期,自然状态下花岗岩的声发射事件率平静期比饱和状态下平静期稍长;饱和花岗岩岩样的声发射平均事件率要比自然状态下高,而且高声发射事件率持续时间较长,自然状态花岗岩较大声发射能率出现时间滞后于饱和花岗岩;花岗岩岩爆过程中声发射事件率与能率变化规律呈现此消彼长的特点;自然状态花岗岩出现初始损伤的时间滞后于饱和花岗岩。
A dual-axis servo control system was used to simulate the granite rockburst in natural and saturated conditions. At the same time, acoustic emission data were monitored and collected by PCI-2 Acoustic Emission System manufactured by American Physical Acoustics Company. The effect of water on rockburst was studied. . The results show that the difference of water content corresponds to the acoustic emission characteristics of different granite rockburst experiments; the time lag of the granite particles of saturated granite is smaller than that of natural granite; both the natural and saturated granite have an axial load of 65% ~ 80% The acoustic emission event of the granite under quiescent period is slightly longer than the quiescence under the natural state. The average AE rate of the saturated granite samples is higher than that of the natural state, and the AE events The longer the duration, the longer the spontaneous emission energy of natural granite appears than that of saturated granite; the change rule of acoustic emission event rate and energy rate in granite show a shifting feature; the time lag of initial damage of granite in natural state Saturated granite.