Abstract：An experimental research of the infrared thermal image in the process of rock fracture was carried out.The study used the granite with the double crack objection analyze the crack initiation, propagation, coalescence, interaction, and the change of macro-strength leaded by them.I did the infrared thermal image examination and numerical simulation for 7 granite sample with double crack to view the regularity of rock failure.The results evince that the AE prognostic of rock's brittleness fracture is not obviously.There will be small scale AE phenomenon before the rock's main fracture, and they release a little energy.When the rock happens the main failure, it will bring out lots of AE, especially in rock burst.The event of experiment confirmed that there are infrared abnormal phenomenon during the rock facture process, and the high temperature realm or stripe at the fracture field.The experiment results indicated that the infrared characteristic of porphyritic texture granite before failure represents the high temperature prognostic.

Keyword：heterogeneity;fracture coalescence;infrared thermal imaging system;granite;