花岗岩巷道岩爆过程红外辐射时空演化特征室内模拟试验研究

通过含孔花岗岩的双向加载试验模拟巷道岩爆过程，以红外热像仪为观测手段，利用红外热像和最低红外辐射温度作为监测指标，研究岩爆过程中的红外辐射温度时空演化特征。结果表明：岩爆过程红外辐射时空演化特征与岩爆孕育、发生过程具有良好的同步性。岩爆发生前红外热像上出现低温嵌套于高温条带间的温度场，其在空间上的延伸扩展则是岩爆孕育和发展过程在温度场中的反映，其出现的位置对应着岩爆发生的区域。最低红外辐射温度呈现出上升-短暂下降-上升-下降4个阶段性特征，岩爆发生前最低红外辐射温度出现3个突变转折点。试验结果对于巷道岩爆灾害的时空预测具有一定的理论意义。

Laboratory simulation of temporospatial evolution characteristics of infrared radiation in the process of rockburst in granite tunnel

Bidirectional loading experiments are conducted on granite specimens with holes to simulate the tunnel rockburst. The infrared thermal images and the minimum infrared radiation temperature are employed to determine the temporospatial evolution characteristics of infrared radiation temperature in the process of rockburst. The results show that the temporospatial evolution characteristics of infrared radiation in rock blasting process are synchronized well with the process of initiation and development of the rockburst. Before the rockburst, it is found that there is the low temperature field in the infrared thermal images nested in the banded temperature field. The low temperature field extension reflects the rockburst breed and development process in the temperature field, and its position of appearance corresponds to the region that rockburst occurs. The evolution of the lowest infrared radiation temperature shows a 4 stage characteristics as rise - brief fall - rise - fall. Three abrupt turning points are observed in the lowest infrared radiation temperature before the rockburst. The above results have some theoretical significance for temporospatial prediction of tunnel rockbursts.