基于岩爆灾害是静载与动载共同诱发的工程事实,从动静组合加载下岩石破坏过程中能量储存和释放特征出发,充分借鉴现有岩爆倾向性指标的合理之处,提出动静组合加载下的岩爆的倾向性指标。该指标能克服现有指标只考虑静载的局部性,更能反映出岩体岩爆破坏应力峰值后的能量释放特征。选取0轴压、抗压强度的20%,60%,70%和80%共5个典型轴压水平,进行不同冲击能量下的动静组合冲击实验。通过对试验结果的分析,考察动静组合加载下的岩爆特性及倾向性指标方法。研究结果表明,新指标能够较好反映岩石的岩爆倾向性。通过分析比较,进而提出动静组合加载下岩爆倾向性指标判据的初步建议。根据该建议指标可以反映出激励性岩爆的发生受静载和动载2种因素的综合作用。
Based on the rockburst mechanism of coupled static and dynamic loads and the energy characteristics of storage and release during rock failure process, and the rationality of several existing rockburst proneness indices, a new rockburst proneness index under coupled static and dynamic loads is proposed. This index avoids the one-sidedness and difference of index, and can reflect the character of energy release(when the curve after the stress peak of rockburst failure proceeding. Five cases, without axial pre-compressive stress and with four levels(in accordance with the static load strength of 20%, 60%, 70% and 80% in 4 series) of axial pre-compressive stress were designed to conduct impact tests with different incident energy. By analysing the testing result, the rockburst characteristics and proneness index under coupled static and dynamic loads were discussed. The results show that this new index is verified to be able to show fairly well the rockburst proneness. Finally, a criterion of rockburst proneness is put forward. This new index reflects the interaction of static and dynamic loads on the impellent rockburst.