열적외선 영상을 이용한 암석의 일축압축파괴 특성 연구
Investigation of Rock Failure under Uniaxial Loading Using Thermal Infrared Image
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초록
일축압축시험에서 암석에 축적된 역학적 에너지는 파괴시험 중 빛이나 소리, 열 등 다양한 형태의 에너지로서 발산이 된다. 암석의 파괴에서 발생하는 열분포특성의 변화를 연구하기 위하여 국내에서 화강암 및 섬록암, 현무암, 응회암의 시료를 채취하였으며, 일축압축시험을 수행하여 파괴직전 및 파괴순간, 파괴직후의 온도분포를 측정하였다. 시험 결과로부터 파괴 전 온도상승 지점으로부터 균열발생지점의 예측이 가능하고, 파괴순간에는 대각선방향으로 발생하는 균열에서 응력집중과 입자 및 파괴면 사이의 마찰로 인한 온도상승이 관찰되었다. 파괴직후에는 에너지 방출로 인해 시편표면에서 초기온도보다 더 낮은 온도분포가 나타난다.
Abstract
Strain energy accumulated in the rock specimen during uniaxial compressive test is emitted as various forms such as light, sound and heat. Thermal infrared camera was applied to detect the increase of temperature and the distribution of thermal abnormalities at the three phases of rock failure, before, at the moment, and after failure, for the granite, diorite, basalt and tuff specimens obtained in Korea. Precursor of the fracture before the failure was detected with increase of temperature on the surface of specimen, and from this, occurrence of the fracturing is predictable. At the moment of the failure, temperature of fracturing surface increased because of energy concentration and fraction during breakaway of the inclined fracturing surfaces. After the failure, lower temperature of the specimen compared with initial stage of the test was investigated.
참고문헌 (18)
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