ABSTRACT
Laboratory experiments were conducted to investigate the stress wave propagation and dynamic mechanical characteristics of sandstone under different temperatures and axial compressions, in which a self-developed dynamic disturbance test system was utilized. The results indicate that the influences of temperature and axial pressure on the dynamic strength of the sandstone are similar. The dynamic strength increases first and then decreases with the increase in either temperature or axial pressure. A critical temperature of 100°C is obtained for rock strength, at which the dynamic strength of the rock reaches its maximum value. There is no fixed turning point for axial pressure, while the critical axial compressive ratio gradually decreases with the increase in treatment temperature. The influence of temperature on the internal crack and mechanical properties of rock is further analyzed from the microscopic angle using a scanning electron microscopy technology.
