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利用红外热成像技术对花岗岩室内岩爆模拟过程中卸载面的温度场演变进行了实验研究.岩爆实验共进行了5次循环加卸载,其中,第1次卸载后的红外辐射平均温度相比于实验前有所下降.实验结果表明:在应变能累积阶段,红外辐射平均温度随应力增加而升高.在损伤演化阶段,伴随有裂纹的开展,这个过程会使岩体的局部温度小幅升高.在弹射阶段,岩体局部温度的增幅大于损伤演化阶段.岩爆模拟过程中裂纹的扩展产生的局部温度增幅要远大于发生弹射的局部温度增幅.通过利用红外热成像技术能够量测到岩爆实验过程中试样表面的裂纹扩展过程并建立温度增幅与裂纹长度的定量关系.
Infrared thermography was used to study the evolution of the temperature field in the unloading surface during the rockburst simulation of granite.The rock burst experiment carried out five cycles of unloading and unloading, in which the average infrared radiation temperature after unloading The experimental results show that the average temperature of infrared radiation increases with the increase of stress in the phase of strain energy accumulation.In the stage of damage evolution, with the crack initiation, the local temperature of rock mass will increase slightly During the ejection stage, the local temperature increase of rock mass is larger than that of the damage evolution.The local temperature increase caused by the crack propagation in the rockburst simulation process is far greater than the local temperature increase caused by catapult.Through the use of infrared thermography, The crack propagation on the specimen surface during the rockburst experiment and the quantitative relationship between the temperature increase and the crack length were established.