Abstract

Although this site is designed with a non-vibration excavation method for a section of 265 m, there are concerns about decline of constructability and economic feasibility. For this reason, the low-vibration electronic detonator blasting method was suggested. To evaluate the applicability of the low-vibration electronic detonator blasting method, the damage range of blasting vibration of low-vibration electronic detonator blasting applied just before the site (suggestion Ⅰ) and low-vibration electronic detonator blasting constructed close range the subway like this site (suggestion Ⅱ) was analyzed. As a result of comparing the blasting vibration damage ranges of the two suggestions, the damage range of suggestion Ⅱ was calculated more conservatively. Considering the specificity of the close range of this site, suggestion Ⅱ was selected for design change for safer construction. As a result, it is predicted that there will be no damage to the structure even if the 72 m section out of the non-vibration excavation 265 m section is changed to the Low-vibration electronic detonator blasting. And it is evaluated that high economic benefits can be obtained because the total expected excavation period can be reduced by 144 days from 662.5 days.