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弹性应变能指标方法是岩爆倾向性评判中应用最多的一种方法,但该方法的一个技术难题是在实验中难以确定卸载点。在武夷山隧道工程的岩爆倾向性评价的室内试验中结合岩石的声发射监测技术,试图解决这个难题,并利用弹性应变能指标法对该隧道的岩爆倾向性进行了评价。试验研究结果表明,采用声发射监测技术并利用岩石峰值破坏前声发射突增的特性,可以较好地控制初次加载达到岩石峰值强度的80%以上,且在岩石不发生破坏的情况下及时卸载,从而能很好地满足弹性应变能指标法对岩石加卸载条件的要求,提高了测试结果的可靠性。同时,本实验得出该隧道具有发生中等岩爆的倾向性的结论。
The elastic strain energy index method is one of the most widely used methods in the rock burst propensity assessment. However, one technical problem of this method is that it is difficult to determine the unloading point in the experiment. In the indoor experiment of rockburst propensity evaluation of Wuyishan tunnel project, the rock acoustic emission monitoring technology was attempted to solve this problem. The rockburst propensity of the tunnel was evaluated by the elastic strain energy index method. The experimental results show that the acoustic emission monitoring technology and the sudden increase of acoustic emission before the peak damage of rock can control the initial load to reach more than 80% of the rock peak strength and timely unload the rock without any damage , Which can well meet the requirements of the elastic strain energy index method on rock loading and unloading conditions and improve the reliability of the test results. At the same time, this experiment concludes that the tunnel has the tendency of moderate rock burst.