Predicting points of the infrared precursor for limestone failure under uniaxial compression

• The image subtraction method was used to process the IRR image on the rock surface.
• The evolution characters of IRR was used to analyse the precursor of rock failure.
• The temperature variations were evaluated in different regions of rock surface.
• The temperature variations were regarded to cause by the rock stress concentration.
• The proposed stress-strength ratio of predicting points were 85.2% and 89.5%.