Temperature effect on granite strain burst based on binocular stereovision technology

Binocular stereovision technology was used to track the ejection path of fragments during granite strain burst tests. Additionally, the volume and spatial position of fragments were calculated using this method for four group specimens treated at different temperature (25 degrees C, 50 degrees C, 100 degrees C, and 150 degrees C). Results indicate that binocular stereovision technology is an effective method for calculating the spatial position for most fragments. Additionally, strain burst intensity increases with increasing temperature, which is reflected in the volume of strain burst pits, fractal dimension of fragments, total kinetic energy of ejection fragments, impact area and scattering angle. Furthermore, motions of most of the ejected fragments are horizontal or oblique-up, and the higher temperatures correspond to more oblique-up motions. Moreover, the velocity and grain size distributions of ejected fragments are lognormal, and the statistical mean velocities increase with increasing temperature.