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根据岩爆孕育及发生过程中围岩变形量的自相似特征,提出了一种时间分形计算方法.基于该方法,针对某水电站深埋引水隧洞施工过程中大量不同等级即时型的岩爆典型案例,进行岩爆过程围岩变形量的时间分形研究,结果表明:深部岩体隧洞岩爆过程中围岩变形量在时间上具有分形结构,并且表现出很好的自相似特征;依据围岩变形量时间分形维数可以对即时性岩爆进行等级划分,强烈岩爆分形维数均大于1.8,中等岩爆分形维数在1.5~1.8内,轻微岩爆分形维数小于1.5;在岩爆孕育及发生过程中,每一日的变形量时间分形维数随着岩爆孕育过程不断增加,当岩爆发生时达到最大值.上述研究结果可以为高地应力条件下深埋硬岩隧洞施工过程中岩爆灾害的预测与防治提供合理的科学依据.
According to the self-similar feature of the deformation of surrounding rock in the process of rockburst inoculation and occurrence, a time fractal calculation method is proposed.Based on this method, a large number of typical cases of rockburst with different grades of instantaneous type in the process of deep- , The time-fractal study on deformation of surrounding rock during rockburst is carried out. The results show that the deformation of rock mass during the process of rock burst in deep rock mass has a fractal structure in time and shows good self-similarity. According to the deformation of surrounding rock The time fractal dimension can classify the instantaneous rockburst with the fractal dimension of strong rockburst greater than 1.8, the fractal dimension of medium rockburst within 1.5 ~ 1.8, the fractal dimension of light rockburst less than 1.5; In the process of occurrence, the fractal dimension of the deformation of each day increases with the geo-explosion process, and reaches the maximum value when the rock burst occurs.The results of the above study can be used in the construction of deep-buried hard rock tunnel under high ground stress Rockburst disaster prediction and prevention provide a reasonable scientific basis.