Numerical simulation on crack propagation of coal bed deep-hole cumulative blasting

Abstract

Based on the field experiments of coal bed deep-hole cumulative blasting,nonlinear dynamic analysis finite element software ANSYS/LS-DYNA was applied to simulate splitting process,investigate coal body mechanical behavior and crack propagating mechanism under cumulative blasting.The studies show that blasting changes coal body stress state,and cumulative effect leads to significant changes of mechanical property in cumulative direction.Furthermore,crush zone range in cumulative direction is relatively smaller,but crack propagating range is distinctly larger than that in the non-cumulative direction.