Abstract
Thermal damage and energy evolution characteristics in process of impact failure of sandstone after high temperature treatment were studied by split Hopkinson pressure bar (SHPB) system. The ultrasonic P‐wave velocity, density, porosity, peak stress, ET/E0, thermal damage, fracture, and energy evolution characteristics of sandstone with temperature during the experimental process were explored. Results show that, with the increase of temperature, the ultrasonic P‐wave velocity and density decrease, while the porosity increases. It is found that the peak stress and ET/E0 decrease with the increase of temperature, and the decreasing trend is fitted with the simple cubic equation. Above 600°C, dynamic peak stress and ET/E0 decrease rapidly. The thermal damage of rock increases with the increase of temperature, which is in accordance with the logistic curve model. The thresholds of damage strain energy release rate are 200°C and 800°C in this research. Its total input strain energy decreases with the increase of processing temperature and decreases sharply when the temperature is over 600°C. The variation of total input strain energy has small change at the range from 400°C to 600°C.
Highlights
Underground mining and utilization of deep underground space have long been considered a high-risk activity
Liu and Xu [7, 8] carried out the dynamic mechanical experiments on marble under different temperature and different strain rates by using the high temperature split Hopkinson pressure bar (SHPB) experimental system
Kong et al [11] studied the differences in the thermal mechanical properties and acoustic emission (AE) characteristics during the deformation and fracture of rock under the action of continuous heating and after high temperature treatment
Summary
Underground mining and utilization of deep underground space have long been considered a high-risk activity. The study of physical and mechanical properties, impact damage, and energy dissipation of rocks after high temperature has aroused great concern. Deep mining and utilization are related to the dynamic properties of rocks under different temperature environments [5]. To study the dynamic damage and energy dissipation of sandstone after high temperature treatment, many experts and scholars have carried out a series of experiments and obtained the experimental results. Yin et al [9, 10] analyzed the stress-strain curve, elastic modulus, dynamic damage, and energy dissipation of rock. The dynamic failure characteristics of sandstone after high temperature treatment were studied by using a split Hopkinson pressure bar (SHPB) system. The effect of temperature on the physical and mechanical properties of rock is analyzed
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