J Coast Disaster Prev > Volume 7(3); 2020 > Article
Journal of Coastal Disaster Prevention 2020;7(3):139-146.
DOI: https://doi.org/10.20481/kscdp.2020.7.139    Published online July 30, 2020.
Evaluation of AnchorPenetration Depth based on Numerical Analysis forBurial ProtectionMethod of Submarine Cables
Jung-Bum Jang, Ha-Neul Kang, Jeong-Hun Kim
해저케이블 매설 보호공법에 대한 수치해석 기반 앵커 관입깊이 평가
장정범, 강하늘, 김정훈
 
Abstract
Submarine cables are installed and operated for the stable power supply of island regions, and feature protective measures to counter marine hazard factors. With regard to the protection techniques to prevent damage to submarine cables, the method of digging and embedding the submarine ground is applied the most. However, since there are no design criteria and techniques for such protection facilities, the burial depth of the submarine ground has been calculated only qualitatively and empirically after an ocean survey is conducted. Such an imperfect method has led to assorted damages to submarine cables. Therefore, in this study, to ensure the safety of submarine cables from marine hazard factors, the three-dimensional dynamic interaction analysis model was established for the ship anchor and ground, and the penetration depth of this anchor was calculated through numerical analysis for the burial protection method. These results were compared and evaluated with the results of the full scale test for anchoring and dragging anchor. As a result, the error rate(average) of the anchor penetration depth through the numerical analysis and test was 12.2% in the ground conditions of sand, clay and multi(clay/sand) layers. This error rate was analyzed to be caused by various uncertainties in the test, such as the dynamic impact of the anchor and ground conditions, and the numerical analysis was evaluated to ensure sufficient reliability. The results of this study are expected to be useful in the burial depth calculation of the burial protection method to ensure the safety of submarine cables.
Key Words: Anchor penetration; Burial protection method; Submarine cables; Numerical analysis; Full scale test
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