Dynamic Mechanical Characterization of Weakly Cemented Sandstone with Negative Temperature and Water Saturation
The construction of western mines is constrained by its unique geological environment,and the freezing and blasting shaft digging effectively overcomes the deep water-rich environment,so the study of the dynamic mechanical properties of western water-saturated weakly cemented sandstone in the negative-temperature environment is of reference significance to the actual project.To carry out SHPB dynamic compression test to study the dynamic mechanical properties of water-saturated white sandstone,it is concluded that(1)The dynamic stress-strain curve of water-saturated white sand-stone can be divided into linear elasticity stage,stress yielding stage and unloading stage.(2)The peak stress of saturated white sandstone increases with the strain rate.The peak stress of water-saturated white sandstone exhibits a significant enhancement effect with decreasing temperature.(3)Combined with the water-saturated white sandstone energy dissipation and damage morphology analysis can be obtained,with the strain rate of the overall rule of change of damage for the gradual increase in the de-gree of fragmentation,corresponding to the energy density with the increase in strain rate and increase.Water-saturated white sandstone with the temperature damage law for the destruction degree gradually re-duced,corresponding to the energy consumption density with the temperature decreased and increased.