Abstract:

The hole rock is selected as a spesimen, and the thermal infrared radiation variation features of hole rock are experimentally studied in the process of loading by using uniaxial loading system and thermal imager, as well as combining the numerical simulation. It is revealed that the distribution of compression stress and tension stress on hole rock are symmetrical, which results in the symmetrical distribution of thermal image. The surface radiation temperature in tension stress area decreases and the radiation temperature in compression stress area increases. There is a fine corresponding relation between stress field and infrared radiation temperature field. In the later period of loading, rock appears fractures and the radiation temperature on shearing fracture is increasing; but the radiation temperature on the position of tension fracture is almost not changed. The fracturing type is closely related to the infrared radiation temperature variation. The rock fails finally along the shearing fracture; and the temperature-increase strip is the important infrared precursor of rock fracture and destabilization. The experimental results indicate again that the thermal imaging technology can detect the stress and catastrophe of rock

Key words: hole rock, fracture, infrared radiation, catastrophe detection