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在应用断裂力学原理分析岩体裂隙扩展特点的基础上， 分析讨论了岩爆发生机理， 提出了隧道围岩应力强度因子等值线的概念， 认为隧洞岩爆将沿该应力强度因子等值线 ＫⅡθ＝ ＫⅡＣ圈定的范围崩落， 岩体裂隙失稳扩展导致隧洞岩爆的必要条件为同时满足裂纹开裂判据 ＫⅡ＝ ＫⅡＣ及裂纹失稳扩展判据ｋ ＋ ｆ′（δ） ＜ ０ ， 并指出同时满足这两个条件的岩体裂隙有临界开裂和临界止裂两个长度。
Based on the analysis of crack propagation characteristics of rock masses using the principle of fracture mechanics, the mechanism of rock burst is analyzed and discussed. The concept of stress intensity factor isoline of tunnel surrounding rock is proposed. It is believed that tunnel rock burst will follow this stress intensity factor contour. KIIθ = KIIC delineated the scope of the collapse, the expansion of rock fracture instability led to tunnel rockburst necessary conditions to meet the crack cracking criteria KII = KIIC and crack instability expansion criterion k + f ’(δ) <0, and pointed out At the same time, the rock fractures satisfying these two conditions have two lengths of critical cracking and critical crack arrest.