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隧道在爆破荷载作用下的温度变化会使围岩遭受温度应力集中效应,造成围岩结构损伤,使隧道光爆成型质量差,如何避免围岩缺陷对隧道光爆成型质量的影响亟待研究与解决。以成渝高铁某隧道工程为背景,基于红外热像原理,对隧道掌子面光爆红外热像进行实验设计,从不同部位的节理裂隙岩体的红外温度异常区域的温度分布、温度变化范围等方面对围岩缺陷进行判断,分析其分布规律。研究结果表明:掌子面岩石具有明显的高温条带与低温区域相间的辐射温度场,节理裂隙处红外温度较低,岩石突变处红外温度较高;掌子面岩石破裂过程中红外温度异常,主要表现为阶梯状交替升降温,并明显出现高温区和低温区。研究结果可为隧道光爆炮孔布置、装药参数设计、围岩稳定性评价提供一定的科学依据。
The temperature change of the tunnel under the blasting load will cause the temperature stress concentration effect on the surrounding rock, which will cause the damage of the surrounding rock structure and the poor quality of the tunnel explosion. How to avoid the influence of surrounding rock defects on the tunneling burst quality is urgently needed to be studied and solved . Based on the tunnel engineering of Chengdu-Chongqing high-speed railway, based on the infrared thermal imaging theory, the infrared explosion of the tunnel face was experimentally designed. From the infrared temperature anomaly region of the jointed fractured rock mass in different parts, the temperature variation range And other aspects of the judgment of the surrounding rock defects, analysis of its distribution. The results show that the rock of the facet has obvious temperature field between the high temperature band and the low temperature region, the infrared temperature at the joint fissure is lower and the infrared temperature is higher at the rock abrupt change. The infrared temperature is anomalous during the rock fracture, The main performance for the ladder-like alternating temperature rise and cooling, and obviously high temperature and low temperature zone. The results of this study can provide some scientific evidences for tunneling of light-blasting tunnels, design of loading parameters and evaluation of surrounding rock stability.