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STUDY ON THE MONO-PILE FOUNDATION OF OFFSHORE WIND TURBINE BY USING P-Y CURVE

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Abstract
By the environmental pollution, global warming and resource depletion owing to the utilization of fossil fuel, various green energies has been recently in the spotlight. Of these, interest in the wind energy has been increased since the high quality wind resources are obtained both in onshore and offshore.
Wind, the driving force for the wind power generation as one of the green energies, is observed higher quality value in the offshore than that of onshore. Also, the development of offshore wind towers has been in the spotlight as an alternative method in order to solve the problems of onshore wind farm such as securing sites, noise, and electromagnetic waves, and in order to get efficient wind power energy. Therefore, the many researches on offshore wind energy have been carried out.
As wind towers are advanced to ocean, offshore wind towers have been enlarged. Also, various external forces such as wave force and collision of vessel and tidal current, act on offshore wind tower. Thus, the stability of offshore wind tower is required to endure wind force and wave force.
Mono-piles are often applied as foundations for offshore wind tower at water depths less than 30m. In this type of foundation, subsoil conditions affect to endure external force. The various soil conditions make different soil reaction and displacement.
In this study, the external forces act on the foundation. And the calculation is carried out, for the various soil conditions such as cohesive soil, sandy soil and multi-layered. The wave force is calculated by Morrison's equation, and thrust force is analyzed by BEMT(Blade Elemental Momentum Theory). Using computed external forces, displacement of offshore wind tower and subsoil reaction are calculated.
As a result, the understanding of the stability in offshore wind tower with various soil conditions is improved, and the various soil conditions are considered for the safety evaluation.
Author(s)
고명진
Issued Date
2014
Awarded Date
2014. 2
Type
Dissertation
URI
http://dcoll.jejunu.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000006694
Alternative Author(s)
Go, Myeong Jin
Affiliation
제주대학교 대학원
Department
대학원 토목해양공학과
Advisor
김남형
Table Of Contents
CHAPTER1 : Introduction 1
1.1 Background 1
1.2 Objectives 3
1.3 Study Contents 3
CHAPTER2 : Basic Equation for External Force 5
2.1 Wind Force acting on the Tower 5
2.2 Wave Force acting on the Tower 6
2.3 Calculation of p-y Relation 7
2.4 Blade Element Momentum Theory 8
2.5 Thrust Force 9

CHAPTER3 : Verification and Consideration 10
3.1 Verification of cohesive soil 10
3.2 Verification of Sandy Soil 11

CHAPTER4 : Application 13
4.1 Calculation of External Force 13
4.2 Calculation of Foundation 16
4.2.1 Calculation of Foundation in Cohesive Soil 16
4.2.2 Calculation of Foundation in Sandy Soil 20
4.2.3 Calculation of Foundation in Multi-layered Soil 23

CHAPTER5 : Conclusions and Remarks 26
5.1 Conclusions and Remarks 26
5.2 Future works 27

References 28
Degree
Master
Publisher
제주대학교 대학원
Citation
고명진. (2014). STUDY ON THE MONO-PILE FOUNDATION OF OFFSHORE WIND TURBINE BY USING P-Y CURVE
Appears in Collections:
General Graduate School > Civil and Ocean Engineering
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