【摘要】 利用在真三轴应力状态下可实现单面突然卸载的深部应变岩爆模拟试验系统,研究了4种层理倾角(0°,30°,60°和90°)的各向异性层状砂岩的应变岩爆破坏特征.通过采集试验过程中的力、高速摄像和声发射信号,以应力曲线和声发射累计能量曲线为基础确定分析关键点.详细描述了不同层理倾角砂岩岩爆后的整体破坏特征和岩爆碎屑特征,分析了4种层理倾角砂岩岩爆试验过程中关键点的声发射累积能量特征.研究发现:层理倾角显著影响岩爆破坏模式,层理倾角较小时更易发生岩爆,岩爆烈度较低,但试样整体破坏更严重.更多还原

【Abstract】 Strain rockburst tests of the anisotropic and stratified sandstone samples with 4 different bedding angles(0°, 30°, 60° and 90°), were conducted in laboratory. Using a special strain rockburst test system, the abrupt unloading on one loading surface under the true triaxial compression condition was conducted. According to signal acquisition for the stress, high-speed photography and acoustic emission data, the key points of analysis were determined. The strain burst modes and rock fragments under different orientated bedding planes were compared and analyzed systematically. Additionally, the characteristic of the accumulated energy of acoustic emission during the rockburst tests were analyzed. The results show that the bedding plane orientations significantly influence the strain burst modes. The smaller the angle between the bedding planes and the maximum principal stress is, the more prone the strain burst occurs, and the lower the intensity is, while the more serious the sample’s overall failure is.更多还原