Experimental Study on Dynamic Compressive and Energy Characteristics of Yellow Sandstone Under Freeze-Thaw Cycles
In order to investigate the dynamic compressive and energy characteristics of yellow sandstone under freeze-thaw cycle,a Split Hopkinson Pressure Bar(SHPB)system was used to conduct dynamic compression tests on yellow sandstone specimens subjected to 0,10,20,and 40 freeze-thaw cycles.The dynamic compressive strength,energy dissipation,and failure mode of yellow sandstone under impact load were obtained.The results show that as the number of freeze-thaw cycles increases,the degree of fragmentation of impacted yellow sandstone increases.The dynamic compressive strength of yellow sandstone specimens under the same number of freeze-thaw cycles increases with increasing strain rate,and the fitting coefficient is close to 1,which has an approximately linear positive correlation.With the increase of freeze-thaw cycles,the dynamic compressive strength of yellow sandstone specimens under the same impact pressure increases first and then decreases,showing an obvious freeze-thaw cycle effect.The dissipated energy of the specimen increases with the increase of strain rate,and at the same time,the speed of energy dissipation improvement also increases,which has an approximately power function relationship.With the increase of freeze-thaw cycles experienced by yellow sandstone,the dissipated energy has a trend of increasing first and then decreasing,and there is an overall trend of decreasing,which shows a negative correlation.
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维普
