Coal-rock damage evolution characteristics based oninfrared radiation under uniaxial compressio

Abstract

In order to quantitatively study evolution law between temperater parameter of infrared radiation and coal-rock damage law under uniaxial compression, temperature data of infrared radiation during coal-rock failure process was collected and analyzed. A coal-rock damage model was established according to damage mechanics theory, so as to obtain relationship between the maximum infrared radiation temperature (MIRT) and coal-rock damage. The results show that: ① The MIRT-time curve has a good correspondence with load-time curve of the coal-rock under loading, and the MIRT can reflect the damage of coal-rock under loading. ② The coal-rock damage model based on infrared radiation temperature accumulation can well reflect evolution, development and failure of cracks in the coal-rock under uniaxial compression. ③ The correlation coefficient between calculated stress based on MIRT accumulation and measured stress is more than 0.8, which is highly correlated, and peak of the calculated stress-strain curve is ahead of the one of the measured stress-strain curve.

Keywords

• coal-rock dynamic disaster
• coal-rock monitoring and pre-alarming
• coal-rock failure under loading
• coal-rock deformation
• coal-rock damage evolution
• uniaxial compression
• infrared radiation
• the maximum infrared radiation temperature