(東北大學(xué) 巖石破裂與失穩(wěn)研究中心, 沈陽(yáng) 110004)
摘 要: 由損傷力學(xué)理論與微元強(qiáng)度統(tǒng)計(jì)理論，得到了巖石聲發(fā)射參數(shù)與損傷參量的關(guān)系。 應(yīng)用自行開(kāi)發(fā)的RFPA2D程序?qū)ΦV柱巖爆的物理過(guò)程進(jìn)行了數(shù)值模擬，其結(jié)果再現(xiàn)了礦柱巖石微破裂誘致宏觀破裂的演化過(guò)程以及和微破裂相關(guān)的聲發(fā)射事件源的空間分布特征和事件序列特征。 特別是考慮到材料非均勻性的影響， 分析了不同粒度材料的模型產(chǎn)生不同巖爆模式的原因。同時(shí)研究了巖爆發(fā)生過(guò)程“平靜期”和“損傷愈合”的特性以及在大的巖爆前有較小的聲發(fā)射這種前兆出現(xiàn)的規(guī)律。
關(guān)鍵字: 數(shù)值模擬；巖爆； 損傷； 聲發(fā)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
