基于多参量归一化的花岗岩巷道岩爆预测试验研究

An experimental study of predicting rockburst in granitic roadway based on multiparameter normalization

通过室内模拟花岗岩巷道岩爆试验,基于线性函数转换的归一化算法,将试验中获得的声发射场和红外温度场等多参量进行归一化处理,在分析其原始曲线特征的基础上,分析各参量在同一尺度下的演化特征,综合研究花岗岩巷道岩爆前兆。研究结果表明:声发射事件率、声发射能率、最高和最低红外辐射温度均适合作为岩爆灾害预测的主要参数。岩爆发生过程中各参量经过归一化处理,在统一尺度下能够快速、有效地识别岩爆发生的前兆。声发射能量加速释放是岩爆发生的早期预警信息;声发射平静期可作为岩爆灾害预警与采取控制措施的关键时期;最低辐射温度突降和最高辐射温度突增表明岩爆随时都有可能发生,这是岩爆发生的征兆。试验结果为岩爆灾害预测研究提供了新的方法和依据。

In this study, laboratory experiments are conducted to simulate the rockburst of granitic roadway. The obtained parameters of acoustic field and infrared temperature field are normalized based on linear function transformation. The evolution characteristics of each parameter on the same scale is also analyzed according to the original curves. Thus the precursor of granite rockburst around roadway is investigated comprehensively. The results show that there are four suitable parameters, i,e,, the acoustic emission event rate, acoustic emission energy rate, the highest temperature and the lowest temperature of infrared radiation, used to predict rockburst. When all parameters during the rockburst are normalized, the precursor can be identified more quickly and efficiently under the unified scale. An early warning sign of rockburst occurring is referred to the accelerated release of acoustic emission energy. The relative calm period of acoustic emission is a critical period, in which the methods to control rockburst-induced disaster are taken. When the lowest radiation temperature suddenly decreases and the highest radiation temperature sharply increases, as the sign of rockburst, the rockburst may occur at any time. Experimental results provide a new method and basis for predicting rockburst disaster.