摘要
借助加载控制系统和声发射检测系统,对某矿煤层顶底板砂岩试样进行单轴加载,同时利用声发射检测设备同步进行监测,从而获得砂岩试样在单轴加载条件下的声发射振铃总计数、振铃计数率、各通道幅值、能量、能量率、幅值等声发射特性参数。结果表明:试验砂岩结构组成单一,强度高且表现为脆性;试样的AE能率与声发射事件率吻合,AE能率在岩石破坏前的声发射相对平静期更加明显;相对平静期的特征点可作为岩石破坏的前兆特征点,岩样相对平静期特征点的应力强度百分比为90%~98%,均处于屈服点后的不稳定裂纹扩展阶段。
By using loading control system and acoustic emission testing system,the coal seam roof and floor sandstone specimens of a mine are under uniaxial loading to monitor the use of acoustic emission testing equipment at the same time for acoustic emission characteristic parameters of sandstone specimens including the total number of ringing,ringing count rate,channel amplitude,energy,energy rate,amplitude under uniaxial loading condition.The results show that the structure of test sandstone is single,high strength and brittle performance; AE energy of the specimen and acoustic emission event rate is identical; the acoustic emission of AE energy rate before rock destruction is more obvious relative to quiet period; the feature points relative to quiet period can be used as precursor feature points of rock failure; the stress intensity percentage of rock sample feature points relative to quiet period is 90% to 98%,both are at the stage of unstable crack propagation after the yield point.
出处
《煤矿安全》
CAS
北大核心
2017年第3期48-51,共4页
Safety in Coal Mines
关键词
岩石力学
声发射
砂岩
平静期
预警
岩爆
岩石破坏
rock mechanics
acoustic emission
sandstone
quiet period
early warning
rock burst
rock failure
