Dynamic Mechanical Response and Energy Dissipation Characteristics of Skarn Under Hydration
In order to examine the influence of hydration conditions on the mechanical properties of skarn,a Split Hopkinson Pressure Bar(SHPB)system was utilized to apply both axial and confining pressure.Cylindrical samples measuring 50 mm×50 mm were subjected to a combined static-dynamic loading method under natural and water-saturated conditions.The axial pressure applied was 3 MPa,with a confining pressure of 1 MPa.Impact tests were carried out at air pressures of 0.8,0.9,1.0,1.1,1.2 MPa,with three replicates con-ducted for each pressure level.The research examined the dynamic compressive strength,energy transfer characteristics,and fracture morphology of rock samples subjected to axial and confining pressures in different states.A comparison was made between the dynamic mechanical properties and fracture patterns of skarn samples in their natural and water-saturated states,with an analysis of the softening effect of water on the rock.Furthermore,the study investigated the dynamic mechanical properties,energy dissipation,and fracture morphology of skarn samples with varying water content.The findings suggest that the dynamic compressive strength of water-saturated skarn samples was,typically lower than that of samples in their natural state,with a reduction ranging from 10.47%to 16.32%.Nevertheless,the impact of water on the dynamic mechanical strength of skarn was found to decrease as the strain rate increased.Additionally,water was observed to decrease the energy absorption rate of skarn samples,although when the energy absorption density reached a certain threshold,the presence of water did not affect the dynamic compressive strength of the skarn.The impact fracture morphology of water-saturated and natural state samples exhibited differences in the strain rate effect due to hydration.Specifically,skarn in the natural state displayed more pronounced characteristics at lower strain rates.
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