关键词: 含孔花岗岩, 岩爆, 红外辐射, 破裂前兆

Abstract: Selecting the infrared thermal imager CAM SC3000 produced by America as observation method, an experiment was carried out to simulate roadway rock burst under different horizontal stress by using the granites with hole. Combined with numerical simulation, the stress distribution and infrared radiation temperature characteristics were studied during the process of rock burst. The results show that the ratio of axial stress and horizontal stress decreases with the increase of horizontal stress, and the greater the horizontal stress is, the higher the maximum principal stress of rock burst is. The average infrared thermal temperature (AIRT) in the left and right sides of the hole suddenly increase or slightly decrease and then transfer to increase, and the corresponding fracture mechanism is the compressively- sheared fracture form and the composite form with early tensile fracture and late compressively- sheared fracture. The main fracture zone extends along the high temperature abnormal stripe on the left and right sides of the hole. During the rock burst process, the increasing extent of temperature above and below the hole is lower than that in the left and right sides of the hole, that is, the temperature increasing extent above and below the hole is relatively stable. Meanwhile, the AIRT above the hole is higher than that below the hole. Moreover, the greater the horizontal stress is, the higher the average infrared radiation temperature around the hole is.

Key words: granite with hole, rock burst, infrared radiation, fracture precursor