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http://dx.doi.org/10.7474/TUS.2021.31.6.578

Numerical Study on Effect of Mesh Size on Vibration and Overpressure Propagation Induced by Underwater Blasting  

Jeong, Hoyoung (Department of Energy Resources Engineering, Pukyong National University)
Son, Hanam (Department of Energy Resources Engineering, Pukyong National University)
Kim, Suhan (Department of Civil Engineering, Pukyong National University)
Kim, Yeolwoo (Department of Civil Engineering, Pukyong National University)
Publication Information
Tunnel and Underground Space / v.31, no.6, 2021 , pp. 578-592 More about this Journal
Abstract
This study performed to investigate the propagation characteristics of overpressure, impulse, vibration in underwater blasting. The difference between air blasting and underwater blasting is that noise and vibration propagate through water as a medium. In some cases, the noise and vibration propagates through various media (rock, water, air, etc.). In this study, the underwater blasting was simulated using AUTODYN, and the propagation characteristics of overpressure, impulse and vibration induced by blasting were analyzed. We mainly focused on the effect of mesh size on the overpressure, impulse and peak particle velocity from the underwater blasting simulation. The numerical results indicated that the overpressure and peak particle velocity tended to decrease as the mesh size increased, while the impulse increased with the mesh size. The results also indicated that the mesh dependence varied depending on the explosive charge and scaled distance.
Keywords
Underwater blasting; Mesh size; Overpressure; Impulse; Peak Particle Velocity (PPV);
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Times Cited By KSCI : 1  (Citation Analysis)
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