Research on dynamic impact failure characteristics of rock with ice cracks
The change of mechanical properties of rock body by the defects of ice-containing fissures in water-rich rocks in alpine region will directly lead to the influence of blasting operation in alpine region.SHPB impact tests and numerical simulations were carried out on ice-fractured rocks at different angles to study the effect of the angle of ice-fracture on the dynamic mechanical properties of ice-fractured red sandstone,and the test results showed that the elastic modulus of the specimens was different,and the elastic modulus of the specimens at 0° and 90° fracture angles were the highest and the lowest,respectively.With the increase of load,the plastic deformation rate of the specimens was affected by the cleavage angle,which showed that the specimens with 60° cleavage angle were the most susceptible to damage and had the best performance in terms of energy absorption.After reaching the peak strength,the cleavage angle further determines the rupture mode and energy release mode of the specimens,and the specimens with 0° and 90°cleavage angles are mainly brittle splitting damage under tensile stress,while the other angles are mixed damage caused by tensile and shear stress.
ice-filled rock fractureSHPBnumerical simulationenergy dissipationcrack propagation
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