Research On Risk Management Of Super Large Diameter Steel Pipe Pile Construction In D Offshore Wind Power Project

As global environmental and energy problems,especially global climate change,become more crucial,all countries around the world are paying increasingly high attention to new energies.Offshore wind power,as an important form of new energy,developed rapidly in recent years thanks to national policy support.Due to its simple structure,mono-pile foundations,which are characterized by its super-large diameter steel pipe pile,enable the installation of wind turbines as soon as the pile is driven into the seabed.This type of foundation was widely applied in recent years.Affected by wind direction,velocity,wave,geology,marine equipment and quality of operators,the super-large diameter steel pipe pile may have many risks in the course of marine transportation,pile driving,and construction.The largest pile in the country now is 8.5m in diameter,97.7m in length and 1,569 t in weight.It was driven into the seabed in Phase I offshore wind power project of China Three Gorges New Energy Corporation in Yangjiang,Guangdong in June of 2019.However,there is hardly any study concerning the potential risks in marine transportation and in the pile driving of super-large diameter steel pipe pile in offshore wind power projects.In this thesis,risk management in works related to super-large diameter steel pipe pile in offshore wind power projects was discussed.First of all,the relevant theories of risk management were introduced,and the risk management methods were introduced in the sequence of risk identification,assessment,response,and control.Next,based on the offshore wind power project of China Huaneng Energy Group Co.,Ltd.in Dafeng,Jiangsu,which is an offshore project under construction farthest from the mainland,risks were identified using the flow chart method and list checking method,as well as assessed using the value at risk method.In addition,the correlations between marine hydrology,meteorology,wave,ocean current,seabed geology,and marine equipment were analyzed.Finally,experts were organized to brainstorm the major,great,and normal risks,find out the countermeasures,and discuss them item-by-item to identify the specific risk control measures.Due to the high degree of focus and operability,the research findings obtained herein can provide references for offshore wind power construction companies in the risk control of construction works of super-large diameter steel pipe piles in offshore wind power projects.