| The quantitative characteristics of thermal infrared radiation (TIR) of rocks in condition of uni-axial loading have been experimentally studied. It was discovered that: 1) The relationship between the rock sample's average infrared radiation temperature (AIRT) and its axial stress is positive linearly related before peak stress. 2) The relationship-curve between the rock sample's AIRT and its accepted mechanical energy is cubic before peak stress. 3) The AIRT rises inside the sample's shearing zone , while drops in its lax zone after peck stress. So thermal infrared radiation images can forebode the location where the fracture will start and can be used to differentiate the nature of the fracture (shearing or laxation). 4) The tendency of the AIRT variation of pre-damaged rock samples is similar to that of intact rock samples except its fluctuation. 5) The infrared abnormality arise at the point of 80%~96% of peak stress in the AIRT-time curve. 6) There are two heating effects, thermoelastic effect and friction heating effect function, during uniaxial loading. They act alternately during different stress stages. Thermoelastic effect dominates during elastic stage; while friction-heating effect dominates during other stages. 7) There is a fine corresponding relationship between the AIRT-time curve and the load-displacement curve at every stage during tension. 8) Finally, the functions between the sample's AIRT and its axial stress, and the relationship between the sample's AIRT and its accepted mechanical energy, are quantitatively given. Besides, the physical-mechanical mechanism of earthquake remote sensing as well as its TIR precursors is discussed.
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