Numerical Analysis of Offshore Wind Turbine Foundation Considering Properties of Soft layer in Jeju

Ki-Ho Yang; Sang-Duk Seo; Yee-Sun Cho; Jeong-Jun Park

doi:10.12814/jkgss.2013.12.4.045

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2013 Vol.12, Issue 4 Preview Page Next Page

Numerical Analysis of Offshore Wind Turbine Foundation Considering Properties of Soft layer in Jeju 제주 연약지층 특성을 고려한 해상풍력기초의 수치해석적 연구

30 December 2013. pp. 45-56

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Abstract

Recently, offshore wind farms are increasingly expected, because there are huge resource and large site in offshore. Jeju island has optimum condition for constructing a wind energy farm. Unlike the mainland, Jeju island has stratified structure distribution between rock layers sediments due to volcanic activation. In these case, it can be occur engineering problems in whole structures as well as the safety of foundation as the thickness and distribution of sediment under top rock layer can not support sufficiently the structure. In this paper, the settlement and stress distribution is predicted by numerical analysis when the mono-pile base are constructed on various soft layer between stratified structure. To determine the settlement of the pile foundation supported on stratified rock layer, the geological investigation at the 3 regiions and the results of laboratory experiments of the stratified rock layer is required.

Keywords

Offshore wind turbine foundation

Stratified structure

Soft layer

Numerical analysis

Settlement

최근 해상풍력발전 단지 조성은 많은 양의 에너지를 창출할 수 있어 그 기대는 점차적으로 증가하고 있다. 특히 제주도는 풍황이 우수하여 해상풍력발전 시스템 운영을 위한 최적의 대상지이기는 하나, 화산활동에 의해 형성된 지형으로 육지부와 달리 기반암인 현무암층 사이에 연약층인 화산쇄설물 및 공동이 불규칙하게 발달된 층상구조로 이루어져 있다. 즉, 해상풍력발전기 기초저면 기반암에 연약한 화산쇄설물이 존재하는 경우 풍력발전기의 주기적인 진동으로 지반의 강도가 저하됨은 물론 장기침하로 인하여 풍력발전기의 장기적인 안정성 확보가 어려울 수도 있다. 본 논문에서는 제주도의 3개 지역에 대한 지표지질조사와 실내실험을 통해 도출된 설계정수를 파악한 후, 수치해석을 통하여 층상구조로 이루어진 연약지층에 모노파일 설치시 연직변위와 응력분포 결과를 도출하였다.

References

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Information

Publisher :Korean Geosythetics Society
Publisher(Ko) :한국지반신소재학회
Journal Title :Journal of the Korean Geosynthetics Society
Journal Title(Ko) :한국지반신소재학회 논문집
Volume : 12
No :4
Pages :45-56
Received Date : 2013-11-22
Revised Date : 2013-12-11
Accepted Date : 2013-12-12
DOI :https://doi.org/10.12814/jkgss.2013.12.4.045

Journal of the Korean Geosynthetics Society ISSN:2508-2876(Print) 2287-9528(Online) 한국지반신소재학회 논문집

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