Research on Impact of Pre-drilling Hole Diameter on Stress Relief and Slot Blasting Effectiveness in High-stress Tunnels
As coal mining progressively advances into deeper areas,the issue of stress concentration during tunnel excavation becomes increasingly prominent and urgently requires effective solutions.This paper employs the numerical simulation software Ansys/Ls-Dyna to systematically investigate the impact of different diameter pre-drilled holes on the stress relief and slot blasting effects in high-stress environments.The Image J image processing software was utilized to conduct a detailed analysis of damage cloud maps resulting from tunnel slot blasting.The findings indicate that as the diameter of the pre-drilled holes increases,the effective stress in the area from the bottom of the hole to the interior of the rock gradually decreases,effectively achieving the stress relief effect.Additionally,as the diameter of the pre-drilled holes increases,the size of the rock fragments produced by slot blasting gradually diminishes,with a significant increase in the proportion of the smaller fragments.Furthermore,in blasting with larger diameter holes,the distribution of rock fragment sizes is more uniform.The research outcomes are of significant importance for enhancing the effectiveness of slot blasting in high-stress tunnels.
high stressadvanced drillingcut blastingnumerical simulating
万方数据
维普
