岩爆倾向性指标及其相互关系探讨

Discussion on rock burst proneness indexes and their relation

岩石岩爆倾向性评价是地下工程岩爆风险评估的基础,评价指标众多,且各有特点,应用存在误区。在澄清岩爆倾向性概念的基础上,通过系统文献调研,对岩爆倾向性评价指标进行了归纳和分类,从获取方法的角度重点分析了岩爆倾向性指数W_(et)和强度脆性系数B。针对W_(et)获取中卸载点难以准确控制的传统难题,建议了以体积应变反弯点作为卸载控制点的试验方法,试验结果表明,该方法科学、有效。基于对岩石W_(et)和B值的充分调研总结,分析了二者的相互关系,改进了B值评价标准,为更科学合理地评价岩石岩爆倾向性奠定了坚实基础。

The evaluation of rock burst proneness is the basis of risk assessment of rock burst in underground engineering. However, existing numerous evaluation indexes with different characteristics results in application errors frequently. After clarifying the concept of rock burst proneness, the evaluation indexes of rock burst proneness were summarized and categorized through a comprehensive literature review. From the perspective of acquisition methods of their values, the index of rock burst proneness （Wet） and the coefficient of intensity brittleness （B） were analyzed. The inflection point of volumetric strain, as unloading control point in test process, was recommended to determine the value of Wet. Thus, the traditional difficulty that the unloading point was hardly controlled during the test process, was solved. According to testing results, this method was proved to be scientific and effective. By comprehensively investigating the values of Wet and B for different kinds of rock, the relationship of these two indexes was analyzed and the evaluation standard of B value was further improved. Therefore, this study provides a significant guidance for scientifically and reasonably evaluating rock burst proneness.