遥感-岩石力学(Ⅴ)——岩石粘滑过程中红外辐射的影响因素分析

REMOTE SENSING-ROCK MECHANICS (Ⅴ)—— ANALYSIS ON THE FACTORS AFFECTING THERMAL INFRARED RADIATION IN PROCESS OF ROCK VISCOSITY SLIDING

利用双轴加载实验装置和热红外成像仪器对岩石剪切滑移过程中的红外辐射进行了成像实验。研究表明,摩擦速率、正应力、摩擦面粗糙度、岩石强度与矿物颗粒硬度是影响岩石粘滑过程红外辐射的重要因素(1)摩擦以等速率进行时,岩石摩擦裂隙表面平均红外辐射温度的时间曲线为直线型,局部最高温度的时间曲线为3次曲线型,而岩石表面平均红外辐射温度与所受机械功线性相关。当所受机械功相等时,摩擦速率越高,温升幅度越小;(2)红外辐射强度与正应力线性相关;(3)摩擦面粗糙度对平均红外辐射温度影响不大,但对局部最高辐射温度影响较大;(4)岩石强度或其矿物颗粒硬度越高,红外辐射温度就越高。

The infrared radiation of rock in the process of shearing viscosity sliding is experimentally studied by the use of bi-axial loader and thermal infrared (TIR) imager system. It is revealed that the loading rate,normal stress,roughness of friction surface,rock strength and the hardness of mineral grain are important factors that affect the TIR radiation of rock sliding. (1) In condition of constant loading rate,the curve between the average TIR radiation temperature of rock surface and the loading time is linear,while the curve between the local highest TIR radiation temperature and the loading time is cubic. The average TIR radiation temperature of rock surface is linearly related to the mechanical power suffered. If the mechanical power suffered is the same,the higher the loading rate is,the less the rise of TIR radiation temperature is. (2) The TIR radiation temperature is linearly related to the normal stress. (3) The roughness of friction surface has a small influence on the average TIR radiation temperature,but has a much higher influence on the local highest TIR radiation temperature. (4) The higher the rock strength or the higher the hardness of the mineral grains is,the higher the TIR radiation temperature is.