LS-DYNA numerical modeling software is used to study of the rock damage distribution features caused by different linear charge density single hole blasting were analyzed and compared.A model that"explosive material-slit tube-air"was established with three different working conditions(g=300 g/m,400 g/m,500 g/m),the radially uncoupled charge structure and axial air space charge structure was adopted to analyze directed concentrating of slit charge,that is rock damage range and slit tube's opening direction has closed relation,the nonslip direction damage is smaller than the slit direction;the optimal line charge density is 400 g/m,and the interval surrounding rock damage is not penetrating if the linear charge density is too small(g=300g/m),it will seriously impact the seams between holes by pre-split blasting,the damaging effect increasing is not obviously if the line charge density is too large(500g/m),and the construction costs increased.
维普
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