Abstract：The surrounding rock damage caused by tunnel blasting excavation has an important impact on the safe construction and support cost of tunnel. In order to study the effect of millisecond delay blasting on the surrounding rock damage of the tunnel, taking Chongqing North Avenue Tunnel as the research background, three-dimensional numerical calculation model of 34 surrounding holes of the tunnel is established through Hypermesh, the surrounding rock damage of different blasting parameters is calculated by Ls-Dyna, and the relationship between blasting damage and inter-hole delay time, charge and surrounding rock lithology is analyzed and studied. The results show that the value of inter-hole delay time has great influence on the damage range. Within a certain range, the damage range decreases with the increase of the delay time. When the inter-hole delay time continues to increase, the damage range tends to stable value. The damage range increases with the increase of the charge. When the delay time between holes increases, the difference of the damage range of different charge gradually decreases. The damage range of the peripheral hole blasting of granite is smaller than that of sandstone. Under different delay time initiation of peripheral holes, the difference of damage range of granite peripheral holes is small, while that of sandstone is large. According to the numerical calculation results, the blasting parameters of the peripheral holes on the site are determined. The tunnel contour is formed smoothly, and the damage of the surrounding rock is controlled well.
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