关键词: 爆破, 微裂纹, 时效损伤, 侵蚀算法, 爆破漏斗, 数值模拟

Abstract: In order to achieve intelligent blasting and reduce the blast-induced adverse influences, the prediction of rock damage and its distribution scope through numerical simulation is of importance in engineering. Thereinto, the reasonable damage constitutive model for rock is crucial. By assuming that the rock mass is an isotropic and continuous material with pre-existing random initial microcracks, an available rock tensile damage evolution equation considering time effect is coupled with the bi-linear elastoplastic constitutive model. Then they are succinctly incorporated into the transient dynamic code, LS-DYNA, via its user defined subroutine. In addition, the erosion algorithm in LS-DYNA is employed. The tensile damage and blasting crater near the free-surface of semi-infinite rock mass is numerically simulated; and the numerical results are satisfactory. This method presented herein has some reference value in rock blasting.

Key words: blasting, micro-crack, time effect damage, erosion algorithm, blasting crater, numerical simulation