多暗色矿物类岩石单轴加载过程中红外辐射定量研究

对首都圈地区的多暗色矿物类岩石(花岗闪长岩、辉长岩及片麻岩)进行了单轴加载至破裂过程的热红外遥感监测实验,发现:(1) 在加载至应力峰值过程中,岩石平均红外辐射温度与应力呈线性正相关关系;(2) 在加载至应力峰值过程中,岩石平均红外辐射温度与所受机械功呈三次曲线关系;(3) 应力峰后-破裂过程中,岩石沿剪切破裂带辐射温度升高,而在应力松弛或张性区,辐射温度有所降低;(4) 损伤岩石在单轴加载过程中红外辐射温度变化与完整岩石相比总体规律相似,但波动性较大。基于实验分析,建立了岩石应力与红外辐射温度以及机械能与红外辐射温度的定量关系;并对地震遥感及其热红外前兆的物理-力学机制进行了讨论。

QUANTITATIVE STUDY ON THE THERMAL INFRARED RADIATION OF DARK MINERAL ROCK IN CONDITION OF UNIAXIAL LOADING

The quantitative characteristics of thermal infrared radiation (TIR) of rocks(granodiorite,gneiss and gabbro)around the capital area,Beijing,China,in condition of uni-axial loading,were experimentally studied. It was discovered that (1) the relationship between the rock samples average infrared radiation temperature (AIRT) and its axial stress is positive linearly related before peak stress,(2) the relationship-curve between the rock samples AIRT and its accepted mechanical energy is cubic before peak stress,(3) the IRT rises inside the samples shearing zone,while drops in its lax zone after peck stress,and (4) the tendency of the AIRT variation of pre-damaged rock samples is similar to that of intact rock samples except its fluctuation. Finally,the functions between the samples AIRT and its axial stress,and the relationship between the samples AIRT and its accepted mechanical energy,are quantitatively given. Besides,the physico-mechanical mechanism of earthquake remote sensing as well as its TIR precursors is discussed.