해체가 용이한 세그먼트형 이중벽 모노파일에 대한 수치해석 연구
Numerical Investigation of Segment Type Double-wall Monopile for Easy Decommissioning
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Conventionally, a monopile that has reached the end of its design life is required to be removed. While monopiles have been left on site due to economic and technical reasons, cases of decommissioning monopoles have recently been reported, and a decommissioning market is emerging. This paper introduces a new type of monopile with decreased pull-out resistance by prior lifting up of a wedge segment installed on the outer wall of the monopile; consequently, the monopile can be dismantled easily from the operation site. The study conducted several numerical investigations, using finite element analysis, of the effect of segment pull-out for the monopile. After pulling out several segment sizes in the numerical model represented by soil element deletion corresponding to the segment volumes, the pull-out forces were compared to those of the conventional monopile. The results showed that for a segment with a thickness of 5 cm and circumferential angle of 30 °, the pull-out resistance of the proposed monopile was reduced by 32.5% relative to that of a conventional monopile. Also, the results indicated that an increase in the segment angle was a more effective way to reduce resistance than that of the thickness.
Abstract
Conventionally, a monopile that has reached the end of its design life is required to be removed. While monopiles have been left on site due to economic and technical reasons, cases of decommissioning monopoles have recently been reported, and a decommissioning market is emerging. This paper introduces a new type of monopile with decreased pull-out resistance by prior lifting up of a wedge segment installed on the outer wall of the monopile; consequently, the monopile can be dismantled easily from the operation site. The study conducted several numerical investigations, using finite element analysis, of the effect of segment pull-out for the monopile. After pulling out several segment sizes in the numerical model represented by soil element deletion corresponding to the segment volumes, the pull-out forces were compared to those of the conventional monopile. The results showed that for a segment with a thickness of 5 cm and circumferential angle of 30 °, the pull-out resistance of the proposed monopile was reduced by 32.5% relative to that of a conventional monopile. Also, the results indicated that an increase in the segment angle was a more effective way to reduce resistance than that of the thickness.
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