(东北大学 岩石破裂与失稳研究中心, 沈阳 110004)
摘 要: 由损伤力学理论与微元强度统计理论，得到了岩石声发射参数与损伤参量的关系。 应用自行开发的RFPA2D程序对矿柱岩爆的物理过程进行了数值模拟，其结果再现了矿柱岩石微破裂诱致宏观破裂的演化过程以及和微破裂相关的声发射事件源的空间分布特征和事件序列特征。 特别是考虑到材料非均匀性的影响， 分析了不同粒度材料的模型产生不同岩爆模式的原因。同时研究了岩爆发生过程“平静期”和“损伤愈合”的特性以及在大的岩爆前有较小的声发射这种前兆出现的规律。
关键字: 数值模拟；岩爆； 损伤； 声发射
（Center for Rock Instability and Seismicity Research,
Northeastern University, Shenyang 110004, China）
Abstract:The relationship between acoustic emission(AE) parameters and damage variable is obtained by applying the damage theory and microelement statistical strength theory. The simulated results reflect macroscopic failure evolution process induced by microscopic fracture and the spatial as well as the temporal distribution characteristics of acoustic emissions event hypocentre. Especially the heterogeneity of rock is considered, which has a good influence on the AE resulted from the rupture of the rock. Meanwhile, the quiet period and damage recovery property during the process of rock burst are researched, the little micro-seismic events occurring before the strong rock burst can be regarded as the auspice. More importantly, the results presented in this paper illustrate the interdependence of stress, strain, acoustic or seismic emissions, and seismic energy release. With respect to rib pillar collapse, the examples illustrate how failure modes and related seismicity changes as the host rock strength is reduced, and shear deformation are permitted to alter the stress field near or inside the pillars.
Key words: numerical simulation; rock burst; damage; acoustic em
