Rock-burst is a common geohlogical phenomenon in high geo-stress areas. It is also one of concerned geological problems in underground engineering. Three factors were found to pose significant influences on rock burst; the ratio of the second principal stress in rock to the uniaxial compressive strength of the rock, the modified rock burst tendency index and the integrity index of the rock mass. Moreover, a judgment criterion of rock burst intensity was established. Rock burst was evaluated comprehensively by using the extension method based on these studies. The extension method was applied to the rock burst evaluation for the Huangdao water-tight underground oil tank project. The evaluation results show that the judgment criteria and the extension method are appropriate for rock burst evaluation.%岩爆是岩体高地应力区的一种重要地质现象,是岩体山区地下工程建设中比较关注的重要工程地质问题之一.根据岩爆的发生机理,从内因和外因两个方面提出3个影响岩爆发生的核心因素:围岩二次应力的最大主应力与岩石抗压强度比、修改的岩爆倾向性指数和岩体完整性指数.对岩爆倾向性指数的计算方法进行修改,提出修改的岩爆倾向性指数,并将它和岩体完整性指数作为内因,将围岩二次应力的最大主应力与岩石抗压强度比作为外因,以这3个影响因素为判别指标,并确定了岩爆发生等级的判断标准.在此基础上采用可拓方法对岩爆及其发生等级进行综合判断,并运用已经完成的工程实例对该套方法进行验证,最后将其在黄岛地下水封石油洞库工程中进行应用,得到较好的效果.
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