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http://dx.doi.org/10.22704/ksee.2020.38.4.026

Numerical Analysis of Surface Displacement Due to Explosion in Tunnel  

Park, Hoon ((주)코리아카코)
Publication Information
Explosives and Blasting / v.38, no.4, 2020 , pp. 26-36 More about this Journal
Abstract
With the increase of expansion and use of the underground space, the possibility of an underground explosion by terrorists is increasing. In this study, after modeling a circular tunnel excavated at a depth of 50m, an explosion load was applied to the inside of the tunnel. As for the explosion load, the explosion load of the maximum explosive amount for six types of vehicle booms proposed by ATF (Bureau of Alcohol, Tobacco, and Firearms) was calculated. For the rock mass around the circular tunnel, three types of rock grades were selected according to the support pattern suggested in the domestic tunnel design. Nonlinear dynamic analysis was performed to evaluate the influence of the ground structure by examining the surface displacement using the explosion load and rock mass characteristics as parameters. As a result of the analysis, for grade 1 rock, the influence on the uplift of the surface should be considered, and for grade 2 and 3 rocks, the influence on a differential settlement should be considered. In particular, for grade 3 rocks, detailed analysis is required for ground-structure interaction within 40m. Also, it is considered that the influence of Young's modulus is the main factor for the surface displacement.
Keywords
Internal explosion; Explosion load; Rock grade; Nonlinear dynamic analysis;
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