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利用红外热像仪进行无水、无压水、承压水作用下石灰岩双轴加载破裂失稳观测实验,研究巷道掘进时掌子面破裂过程中的红外辐射时空演化规律,以此识别掘进方向的水体情况。实验结果表明:掘进前方不含水体时,掌子面破裂在时序上表现为温度线性升高,破裂前升温加速,在空间上表现为前期均匀升温,临近破裂前出现温度场分异,形成局部高温区,升温加速;掘进前方存在无压水时,温度曲线呈“一级台阶”状上升,热像表现为高温场包围低温场;掘进前方存在承压水时,温度曲线呈“波浪”状上升,热像交替升降温,最终大幅度降温。研究结果可为巷道开挖的遥感观测及巷道渗漏水预测提供理论指导。
Infrared thermal imager was used to observe the rupture instability of limestone under biaxial loading under the condition of no water, no pressure water and confined water. The temporal and spatial evolution of infrared radiation in the rupture of tunnel face during tunneling was studied to identify the direction of heading Of the water situation. The experimental results show that when the front of tunneling is free of water, the fracture of the face of the face shows a linear increase of temperature in time sequence, the temperature is accelerated before the rupture, and the temperature is uniformly increased in the space. The temperature curve shows a “a step ” rise, the thermal image shows a high temperature field surrounded by low temperature field; there is pressure water in front of the excavation, the temperature curve was Wave "like the rise, the hot ascending alternately cool temperature, the final substantial cooling. The results can provide theoretical guidance for the remote sensing observation of roadway excavation and the prediction of roadway seepage water.