不同含水状态下花岗岩岩爆模拟声发射实验研究

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。

Experimental Study of Simulated Acoustic Emission of Granites Rock Burst under Different Moisture State

An experiment is carried out to simulate granites rock burst under natural and saturated state with biaxial rigid servo-controlled system.The PCI-2 acoustic emission system produced by American Physical Acoustics Corporation is used to collect data of the acoustic emission synchronously.Then，the influence of water on tunnel rock burst is studied.It is found that the granite samples with different moisture contents show different acoustic emission characteristics in the process of rock burst.The saturated granites eject rock debris later than the natural granites.The acoustic emission of natural and saturated granites comes into quiet period when the axial load reaches 65%~80% of the peak load and the quiet period with natural granites is longer than that with saturated granites.The average acoustic emission events rate of saturated granites is higher and the duration of high acoustic emission events rate is longer than that with natural granites.The high acoustic emission energy rate of natural granites appears after that of saturated granites.The acoustic emission events rate and energy rate present trading off and taking turns in the process of granite rock burst.The initial damage of natural granites occurs after that of saturated granites.