Experimental Study and Energy Consumption Analysis of SHPB in Water-Saturated Sandstone
Deep engineering rocks are often in a saturated state,and often bear various complex impact forces during blasting and mining.In order to ensure the safe and efficient construction,it is of theoretical signif-icance to study the dynamic mechanical properties of saturated sandstone under different impact loads.The basic physical parameters of the sandstone specimens after water saturation treatment were measured,and the dynamic compression tests of the saturated sandstone specimens under six different impact loads were carried out by using the split Hopkinson Compression Bar Device(SHPB).The results show that the dynamic compressive strength of the saturated sandstone specimen increases with the increasing of the loading rate,showing a quadratic polyno-mial relationship and a significant positive correlation,the dynamic compressive strength increases with the in-creasing of the strain rate,which is approximately exponential,the dynamic strain is obviously affected by the strain rate,which is a secondary growth relationship,and the degree of fragmentation increases with the increas-ing of the impact rate.With the increase of impact pressure,the rupture surface of the specimen gradually in-creases,the more energy absorbed,the degree of crushing intensifies,and the size of the fragments decreases.
rock dynamicssaturated sandstoneloading rateimpact compressionSHPB
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