CAJ | 학술논문

　　筒型基础是一种新型的海上风电基础，由于其具有减少工程量、节省投资、缩短施工时间、可重复使用等优点，在某些领域正在逐步替代桩基和重力式基础。目前工程上对筒型基础的设计还没有现成的规范可供使用，一般是将筒内部土体与筒壁视为一体，然后采用简化的极限平衡方法进行设计计算，不能反映筒内土体的工作特性。以福建近海某风电基础工程为依托，采用大型有限元软件ABAQUS对海上风机单筒基础的承载特性进行了三维有限元数值分析。根据海上风机的受力特点，考虑基础隔舱的作用效果，建立了筒型基础的简化模型与有无隔舱的计算模型。计算结果表明：筒型基础在受荷过程中，基础内部土体产生屈服变形，使得筒型基础的承载特性不同于简化极限平衡方法。两者之间的差异使得实际的地基承载能力比极限平衡方法计算所得的要小。此外，对现行简化计算方法的误差进行了估计，并对筒型基础承载力计算提出建议，可供筒型基础设计者参考。
　　통형기출시일충신형적해상풍전기출，유우기구유감소공정량、절성투자、축단시공시간、가중복사용등우점，재모사영역정재축보체대장기화중력식기출。목전공정상대통형기출적설계환몰유현성적규범가공사용，일반시장통내부토체여통벽시위일체，연후채용간화적겁한평형방법진행설계계산，불능반영통내토체적공작특성。이복건근해모풍전기출공정위의탁，채용대형유한원연건ABAQUS대해상풍궤단통기출적승재특성진행료삼유유한원수치분석。근거해상풍궤적수력특점，고필기출격창적작용효과，건립료통형기출적간화모형여유무격창적계산모형。계산결과표명：통형기출재수하과정중，기출내부토체산생굴복변형，사득통형기출적승재특성불동우간화겁한평형방법。량자지간적차이사득실제적지기승재능력비겁한평형방법계산소득적요소。차외，대현행간화계산방법적오차진행료고계，병대통형기출승재력계산제출건의，가공통형기출설계자삼고。
Compared with traditional offshore foundation structure, bucket foundations which are large cylindrical structures open at the base and close at the top may realize economical advantages over traditional driven piles due to the speed of installation, elimination of the pile driving process, and reduction in quantities and material costs. Though bucket foundation is a new foundation type for offshore wind turbine, there have no standards for bucket foundation designing up to now. In designing the bucket foundation, the simplified limit equilibrium method is usually adopted, in which the soil inside the bucket and the skirt of the bucket are assumed to form a whole foundation. But this method cannot reflect the working mechanism of the internal soil. Based on a foundation of offshore wind turbine in Fujian, adopting the finite element software ABAQUS, the three-dimensional numerical analysis is performed to simulate the working mechanism and evaluate the bearing capacity behavior of bucket foundation. According to the bearing capacity of offshore wind turbine, the simplified model and models with or without compartments are established with the considering of the compartments effect. According to calculation results, the bearing characteristic of the bucket foundation is different from the simplified limit equilibrium method that the internal soil of the foundation yields first in the loading process. The difference leads the simplified limit equilibrium method will over estimate the bearing capacity of bucket foundation. In addition, the error of the bearing capacity calculated by the simplified limit equilibrium method is estimated. The suggestion about the bearing capacity of bucket foundation has reference value to project designer.