摘要
利用热红外遥感成像技术进行岩石低速撞击瞬间的遥感监测,分别进行了以大理岩为主的不同岩性的垂直撞击实验、不同角度的倾斜撞击实验以及不同表面条件(潮湿度)的垂直撞击实验。发现(1)岩石垂直撞击时,均存在一临界速度,不同岩性岩石的临界速度值有所差异,以大理岩为例,其临界速度约为15m/s;(2)辐射特征与撞击因子相关,大理岩在临界速度以内垂直撞击时,热红外辐射通量增量与弹体动能线性相关,热红外辐射温度增量与撞击速度二次相关;(3)不同角度撞击时,热红外辐射特征各不相同,其辐射强度基本上都比相同速度下垂直撞击时强,且在45°角入射时达到峰值;(4)潮湿与干燥大理岩在垂直撞击时具有不同的热红外辐射特征,且其变化趋势与速度相关。
By means of thermal infrared imaging detection on the transient process of rock impact with low velocity,the experiments with variable impacting angle,moisture and lithology are carried out. It is discovered that (1) there exists a critical velocity when rocks subjected to a normal impact,and the critical velocity varies with the rock types and it is about 15 m/s for marble,(2) the radiant characteristics are closely related to the impacting factors,and as to marble subjected to a normal impact within the critical velocity,the increment of thermal infrared (TIR) radiant flux is of linear correlation with the impaction kinetic energy,and the increment of TIR temperature is of conic correlation with the impacting velocity,(3) the radiant characteristics varies with the impacting angle,the radiant intensity in normal impact is almost the weakest,and it reaches the maximum value when the angle is about 45°,and (4) wet and dry rocks show difference in radiant characteristics under impact,and the trend of difference is relevant to the velocity.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第9期1439-1445,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
全国优秀博士学位论文专项基金(200046)
国家自然科学基金(10172090)
北京市自然科学基金(8001003)重点项目联合资助课题。
关键词
遥感-岩石力学
热红外遥感成像
低速撞击
辐射
撞击反演
remote sensing-rock mechanics,thermal infrared (TIR) imaging,low-velocity impact,radiant characteristics,back analysis on impact
