Study on Cumulative Damage Law of Surrounding Rock Induced by Blasting during Tunnel Construction

The tunnel drilling and blasting method inevitably causes damage to the rock mass during the blasting process. This article takes a certain tunnel as the research object, proposes to simulate the process of continuous blasting and repeated blasting in each section of the tunnel, and quantifies the cumulative damage range of surrounding rock under each working condition. The results indicate that: (1) it is advantageous to use equivalent loads to simulate blasting loads when calculating large-scale blasting damage simulations; (2) The damage to surrounding rock caused by single cycle excavation of tunnels is caused by the superposition of multiple stages of delayed blasting, mainly influenced by adjacent auxiliary equipment.