In order to study the characteristics and the accumulated damage law of rock mass under cyclic blasting load,a single blasting damage analysis was carried out based on the finite element software ANSYS/LS-DYNA,and the accuracy of the results was verified.On this basis,numerical simulation of cumulative damage of rock mass was carried out.The results show that the cumulative damage evolution cloud map of rock mass under cyclic blasting is similar to that of single blasting,showing an inverse S-shape on the whole,and the damage increment of rock mass decreases with the increase of blasting times,and the superposition effect of fixed point cyclic blasting load is particularly obvious in the middle of the damage area.There is a damage threshold for rock mass damage,and the damage occurs only after the blasting energy rea-ches the threshold.There is a certain relationship between rock mass damage and detonation distance.With the increase of detonation distance,the amount and increment of rock mass damage caused by blasting decrease continuously.
rock blastingrock damageaccumulated damagedamage incrementsurrounding rock
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