• Title/Summary/Keyword: 충격진동

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Numerical Study on Effect of Mesh Size on Vibration and Overpressure Propagation Induced by Underwater Blasting (수중발파로 인한 과압 및 진동 전파에서 메쉬크기의 영향에 대한 수치해석 연구)

  • Jeong, Hoyoung;Son, Hanam;Kim, Suhan;Kim, Yeolwoo
    • Tunnel and Underground Space
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    • v.31 no.6
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    • pp.578-592
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    • 2021

  • 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.

  • https://doi.org/10.7474/TUS.2021.31.6.578 인용 PDF KSCI