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借用GDA软件来模拟开挖周边的应力重分布 ,在此基础上 ,重点分析了拱形洞室的拱顶、拱肩、两侧及底角的应力分布与岩爆的关系。并提出如何依据dσ3/(σ1 -σ3)大小与正负来分析和估计岩爆位置 ,因为应力差σ1 -σ3可表征岩石的变形与静态破坏 ,而最小主应力增量dσ3的大小可表征抵抗这种变形与破坏的能力。结果是拱肩与底角会出现岩爆。分析结果得到了加拿大某矿山的岩爆发生位置实际资料所验证。最后 ,提出了如何利用预裂爆破方法使岩爆从拱肩迁移到洞室底角。
By using GDA software to simulate the stress redistribution around the excavation, the stress distribution on the vault, arch shoulder, the two sides and the bottom corner of the cavern and the rockburst are analyzed emphatically. And how to analyze and estimate the rockburst position according to the size and the positive and negative of dσ3 / (σ1-σ3) is proposed because the stress difference σ1 -σ3 can characterize the deformation and static failure of the rock, while the magnitude of the minimum principal stress increment dσ3 can characterize the resistance This deformation and destruction ability. The result is a rock burst on the shoulder and bottom corner. The results of the analysis were verified by actual data on the location of a rock burst in a Canadian mine. Finally, how to use the method of pre-split blasting to make the rockburst migrate from the arch shoulder to the bottom of the cavern.