Experimental Study on Infrared Temperature Fields of Bolt and Rock in Condition of Loading

The Infrared radiation experiments on bolt and rock in the process of loading were carried out. It was found that the infrared radiation temperatures of non-bolted block rose wholly and uniformly before stress peak with increase of loading. The bolted rock presented local dissimilation in the thermal image after stress peak. The multi-layer round infrared radiation isothermal lines were formed around bolt. The closer from the bolt centre, the higher, the farther from the bolt centre, the lower temperature was. The temperature was gradually reduced from inside to outside. The change of infrared radiation temperature fields responded to stress fields around bolt. The high infrared radiation isothermal lines corresponded with the high stress areas. The low infrared radiation isothermal lines corresponded with the low stress areas.