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工程实践中岩爆的发生存在一个临界深度。若能根据工程开挖的深度对岩爆的等级进行划分,那么对实际工程中岩爆的预测和控制将具有重要的作用。在国内外各种岩爆判定因子的基础上,分析得到了岩爆判定因子与工程开挖深度的关系。研究了地应力与岩体赋存深度的关系,结合弹塑性力学得到了三种岩爆深度判别公式。根据初始公式对岩爆的判定,在得到的公式中确定了不同深度下岩爆的等级。实例分析结果表明:三种岩爆深度判别公式具有较好的实用性和有效性。
There is a critical depth for the occurrence of rockburst in engineering practice. If the level of rockburst can be divided according to the depth of excavation, it will play an important role in the prediction and control of rockburst in practical engineering. Based on the judgment factors of various rockburst at home and abroad, the relationship between the judgment factor of rockburst and the depth of excavation is analyzed. The relationship between the in-situ stress and the depth of the rock mass is studied, and three rock burst depth discriminant formulas are obtained by combining the elasto-plastic mechanics. According to the initial formula of rock burst, the rock burst at different depths is determined in the obtained formula. The results of the example analysis show that the three rockburst discriminating formulas have good practicability and validity.