Study on Low Temperature Mechanical Properties of Rocks under High Strain Rate
Abstract
Low-temperature rock specimens were prepared by high and low temperature testing machine, and dynamic loads provided by the split Hopkinson pressure bar (SHPB) test system were applied to low-temperature rock specimens. Experiments on low-temperature rock specimens under high strain rates were also carried out, and three type specimens were analyzed. The results indicate that low-temperature rock specimens under high strain dynamic load applied by the SHPB, rock strength properties change with temperature, and change very differently with static load tests, water-saturated sandstone peak stress is initially rising slowly and dropping sharply, peak strain is initially dropping rapidly and rising sharply, respectively the inflection point temperature is -30 ℃ and -10 ℃. And In the range of 25 ℃ to -40 ℃, the trends of marble peak stress and peak strain is increased firstly, decreased and then increased, it has same inflection temperatures are -5 ℃ and -20 ℃. Furthermore, saturated sandstone and dry sandstone peak intensity change with low temperature that initially rising and dropping, the inflection point temperature is -30 ℃. It suggests that the presence of water enhance the effects of hypothermia on the dynamic mechanical properties of rocks, and media ice and rock matrix shrinkage rate difference is a key to rock strength change at low temperature state. That can expand dynamics of construction at low temperature have great significance on resource exploitation monitoring technique.
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