潮湿岩石受力过程红外辐射的变化特征
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摘要
利用红外热像仪对干燥和潮湿砂岩单轴压缩过程中的红外辐射特征进行了试验比较.结果表明:潮湿岩石加载过程中平均红外辐射温度(AIRT)随载荷增加呈上升趋势,AIRT与应力的变化步调一致,曲线波动较小;岩石失稳前单位载荷下潮湿岩石的升温幅度高于干燥岩石,水对岩石受力时的红外辐射具有明显推动作用,但破坏瞬间热像特征变化不很明显.干燥砂岩AIRT与应力的关系不是简单的对应关系,但在破坏瞬间出现显著的增温现象和热像特征的明显变化.可以利用潮湿岩石AIRT与应力的良好同步性监测潮湿岩石的应力变化过程,利用干燥岩石破裂瞬间的热像变化特征分析岩石灾变的空间位置与灾变模式.
The infrared radiation from dry sandstone and damp sandstone in the process of uniaxial compression was detected by means of infrared thermal imager.It was revealed that the average infrared radiation temperature(AIRT) of damp rock increases with loading and keeps its change in step with the stress,and that the fluctuation of AIRT is much less.The AIRT increment of damp rock is higher than that of dry rock under unit load before destabilization and the fact shows that water will intensify the infrared radiation from loaded rock,but no obvious change was found on thermal image during the instantaneous fracture of damp rock.The relation between the AIRT and stress in dry rock is not simply in corresponding state like damp rock,but the obvious AIRT rise and change of thermal images of dry rock were found during instantaneous fracture.It's possible to monitor the rock stress of damp rock via the change synchronization between AIRT and stress,and to analyze the spatial position and mode of the catastrophe by making use of the change of thermal images during instantaneous fracture of dry rock.
The infrared radiation from dry sandstone and damp sandstone in the process of uniaxial compression was detected by means of infrared thermal imager.It was revealed that the average infrared radiation temperature(AIRT) of damp rock increases with loading and keeps its change in step with the stress,and that the fluctuation of AIRT is much less.The AIRT increment of damp rock is higher than that of dry rock under unit load before destabilization and the fact shows that water will intensify the infrared radiation from loaded rock,but no obvious change was found on thermal image during the instantaneous fracture of damp rock.The relation between the AIRT and stress in dry rock is not simply in corresponding state like damp rock,but the obvious AIRT rise and change of thermal images of dry rock were found during instantaneous fracture.It's possible to monitor the rock stress of damp rock via the change synchronization between AIRT and stress,and to analyze the spatial position and mode of the catastrophe by making use of the change of thermal images during instantaneous fracture of dry rock.
引文
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[2]强祖基,徐秀登,赁常恭.卫星热红外异常——临震前兆[J].科学通报,1990,35(17):1324-1327.(Qiang Zu-ji,Xu Xiu-deng,Lin Chang-gong.Satellitethermal infrared anomaly—precursor of impending earthquake[J].Chinese Science Bulletin,1990,35(17):1324-1327.)
[3]Ouzounov D,Freund F.Mid-infrared emission prior to strongearthquakes analyzed by remote sensing data[J].Advances inSpace Research,2004,33(3):268-273.
[4]耿乃光,于萍,邓明德,等.热红外震兆成因的模拟实验研究[J].地震,1998,18(1):83-88.(Geng Nai-guang,Yu Ping,Deng Ming-de,et al.Thesimulated experimental studies on cause of thermal infraredprecursor of earthquake[J].Earthquake,1998,18(1):83-88.)
[5]刘善军,吴立新,吴育华,等.遥感-岩石力学(Ⅴ)——岩石黏滑过程中红外辐射的影响因素分析[J].岩石力学与工程学报,2004,23(5):730-735.(Liu Shan-jun,Wu Li-xin,Wu Yu-hua,et al.Remotesensing-rock mechanics(V)—analysis on the factors affectingthermal infrared radiation in process of rock viscosity sliding[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(5):730-735.)
[6]Wu L X,Liu S J,Wu Y H,et al.Precursors for rockfracturing and failure—partⅠ:IRR image abnormalities[J].Int J Rock Mech&Min Sci,2006,43(3):473-482.
[7]Wu L X,Liu S J,Wu Y H,et al.Precursors for rockfracturing and failure—partⅡ:IRR T-curve abnormalities[J].Int J Rock Mech&Min Sci,2006,43(3):483-493.
[8]吕琪琦,丁鉴海,崔承禹,等.张北6.2级地震前的卫星热红外异常[J].地震,1998,18(3):240-244.(LüQi-qi,Ding Jian-hai,Cui Cheng-yu,et al.Satellitethermal infrared anomaly before the Zhangbei earthquake Ms=6.2[J].Earthquake,1998,18(3):240-244.)
[9]邓明德,房宗绯,刘晓红,等.水在岩石红外辐射中的作用研究[J].中国地震,1997,13(3):288-296.(Deng Ming-de,Fang Zong-fei,Liu Xiao-hong,et al.Research on the action of water in the infrared radiation of therocks[J].Earthquake Research in China,1997,13(3):288-296.)
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