Abstract
The effects of low temperature gradient on dynamic mechanical properties of coal were examined through Split-Hopkinson Pressure Bar (SHPB) Dynamic Impact Experiment, the law of dynamic mechanical parameters of coal specimen changing from room temperature to negative temperature (25 °C, −5 °C, −10 °C, −15 °C, −20 °C, −30 °C, −40 °C) was analyzed, and the coal-rock stress-strain curve characteristics subject to the low temperature-impact load coupling effect was discussed. The law of the effects of different strain rates on the rock strength properties and the compressive deformation and failure was analyzed by studying the coal specimen at −15 °C. Moreover, the mechanical properties of coal specimen in saturated and dry conditions were compared, and the effects of water and water-ice phase transition on the strength properties of the corresponding coal specimen were analyzed.
Highlights
With the balanced development of Chinese regional economy and the deepening of “Great Western Development Strategy”, the coal mining quantity in high altitude, cold, frozen even glacier-deposited areas have been increasing
Chen et al.[8] in a tuff freezing-thawing cycle experiment found that the rock damage and deterioration has a critical saturation rate, when the tuff saturation rate was lower than 60%, the damage and deterioration in the freezing-thawing cycle would be not obvious, but when the saturation rate was higher than 70%, the repeated freezing-thawing cycle would quickly lead to rock failure
The effects of low temperature gradient on the dynamic mechanical properties of coal were studied through Split-Hopkinson Pressure Bar (SHPB) Dynamic Impact Test, the law of dynamic mechanical parameters of coal specimen changing from room temperature to negative temperature was analyzed, the mechanical properties of coal specimen in saturated and dry conditions were compared, and the effects of water and water-ice phase transition on the strength properties of the corresponding coal specimen were analyzed
Summary
With the balanced development of Chinese regional economy and the deepening of “Great Western Development Strategy”, the coal mining quantity in high altitude, cold, frozen even glacier-deposited areas have been increasing.
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