Analysis of Dynamic Mechanical Properties of Frozen Sandstone
In order to consider the dynamic mechanical properties of frozen sandstone under different temperature conditions,this paper sets up six temperature gradient freezes:25,-5,-10,-15,-20,-25℃,and then conducts SHPB series experiments.The experimental results show that the large diameter pores inside the frozen rock sample decrease with the decrease of temperature,while the medium and small diame-ter pores increase with the decrease of temperature;The elastic modulus of frozen sandstone generally increases with the decrease of tempera-ture,and the peak stress increases with the decrease of temperature,showing a significant low-temperature strengthening effect;The peak strain decreases with the decrease of temperature,exhibiting a low-temperature weakening effect.
FreezeTemperature gradientSHPBNuclear magnetic resonanceStress-strain
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