REMOTE-SENSING-ROCK MECHANICS(Ⅳ)——LAWS OF THERMAL INFRARED RADIATION FROM COMPRESSIVELY-SHEARED FRACTURING OF ROCK AND ITS MEANINGS FOR EARTHQUAKE OMENS
Abstract：The fracturing of initial rock mass is another mechanism of tectonic earthquake. Taking it for experimental modeling object，five kinds of typical rocks were collected from the capital area of China，Beijing，and thermal infrared (TIR) radiation imaging experiments were conducted in condition of compressively-sheared rock fracturing. It is discovered from the experimental study that：(1) there are two thermal-stress coupling effects，thermoelastic effect and friction-heat effect，in the process of compressively-sheared rock fracturing，and the higher the ratio of compressive stress to shearing stress is，the more obvious the TIR radiation temperature increment is，(2) in condition of dominating compressive strain，there exists abnormal TIR radiation omen of rock fracturing，(3) the TIR omen of rock fracturing is of obvious temporal-spatial features，i.e.，the average TIR radiation temperature of rock surface increases rapidly as the load reaches to about 80% of the compressive-shear strength，and the higher the ratio of the compressive stress to the shearing stress is，the earlier the appearance of the TIR omen is，and the front edge of the abnormal high temperature strip along the shearing face will move forward until fracturing. The results are basically meaningful for the remote sensing and the forecast of some natural and rock engineering disasters，such as earthquake，rock burst，mine burst and landslide.
