摘要
采用热红外(T IR)成像技术和落球撞击实验,对大理岩、花岗闪长岩、红色斑状花岗岩、辉长岩和砂岩等5类典型地壳岩石试件进行了热红外辐射观测.通过对靶元区域受撞击前后T IR辐射温度进行图像处理,对靶元红外辐射的时延特征进行了研究,得到了相应的辐射温度时延曲线,分析了影响时延曲线形态的相关因素,并对相同撞击条件下不同岩石以及不同湿度岩石的时延曲线特征进行了比较.结果表明:岩石撞击靶元T IR辐射温度的时延曲线形态与撞击速度有关;撞击前后红外辐射的升温幅度、时延曲线的离散性、局部波动性、单调性和斜率等5项特征指标受岩石热导率、比热和发射率等影响;干燥岩石撞击后的T IR升温幅度要稍大于潮湿岩石,干燥岩石的降温要快于潮湿岩石.
By means of thermal infrared （TIR） imaging detecting on rock impacted by free-falling steel ball, the rock target＇s TIR temperature of five typical crust rocks was detected. The time dependent features of TIR radiation temperature of target area were researched by using the professional graphic software. The time dependent curves were reported and the influencing factors of curve pattern were analyzed. The time dependent features of different rocks and same rocks with different moisture under uniform condition were compared. It is shown that the pattern of time dependent curves is related to the impacting velocity, and its five characteristic indexes, i. e. , the rise amplitude of TIR temperature, discreteness, wave character, monotonicity and slope coefficient of time dependent curves, were influenced by heat conductivity, specific heat and emissivity of rocks. The rise amplitude of dry rock＇s TIR temperature is higher than that of wet rock, and the TIR temperature of dry rock falls down faster than that of wet rock.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2005年第5期557-563,共7页
Journal of China University of Mining & Technology
基金
中国科学院武汉岩土力学研究所领域前沿基金项目(Q110307)
国家自然科学基金项目(10172090)
全国优秀博士学位论文专项基金项目(20046)
关键词
遥感-岩石力学
辐射温度
时延
岩石撞击
热红外成像
remote sensing rock mechanics
radiation temperature
time delay
rock impact
thermal infrared imaging
