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针对现有岩爆研究的不足,采用FLAC3D软件开展了岩爆孕育演化的真三轴加卸载试验模拟,并与室内试验结果进行了对比分析,结果表明,岩爆的发生与卸荷位移有关,破坏形式的不同源于卸荷位移的不一致性,其不一致性导致卸荷区域变形的不协调性。卸荷前所受载荷越大,其卸荷面产生的位移就越大,其变形不协调性就越明显,发生岩爆破坏时所含的剪切成分就越大;对于岩爆倾向性岩石来说,发生岩爆所需的临界卸荷位移是相当小的,卸荷瞬间卸荷面附近区域的位移或应变达到临界,将发生即时型岩爆;卸荷后的围岩内部位移值或围岩变形值直接影响着岩爆发生与否、破坏形式和破坏强度。
Aiming at the deficiency of existing rockburst research, FLAC3D software was used to simulate the true triaxial unloading test of rockburst inoculation and evolution, and compared with the indoor test results. The results show that the occurrence of rockburst is related to the unloading displacement, The different forms of failure originate from the inconsistency of unloading displacement, and the inconsistency leads to the uncoordinated deformation of the unloading area. The larger the load before unloading, the greater the unloading surface displacement, the more obvious the uncoordinated deformation, the greater the shear component contained in the rock burst. For rockburst-prone rocks , The critical unloading displacement required for rockburst is quite small. The displacement or strain near the unloading surface reaches the critical moment, and instantaneous rockburst will occur. The unloading displacement value of surrounding rock or Deformation value of surrounding rock directly affects rockburst occurrence, failure mode and failure strength.