CAJ | 학술논문

通过室内三轴固结排水剪切试验等获得典型剪胀性砂土的力学参数，在此基础上利用有限元软件 ABAQUS，开展了近海大直径单桩基础在水平荷载作用下的三维有限元数值分析，揭示了加载过程中桩周土的应力路径，探讨了桩周土内摩擦角、剪胀角及桩土接触面特性等对三维数值分析结果的影响，得到了离心模型试验的验证，进而提出了砂土海床中大直径单桩基础的合理数值分析模型及参数取值方法，并建议风机大直径单桩基础水平承载力确定以变形作为控制标准。在此基础上，利用该数值分析模型分析了现有桩基承载力和变形分析方法对超大直径单桩的有效性，并提出了采用数值分析来确定基础的临界埋深的确定方法。
통과실내삼축고결배수전절시험등획득전형전창성사토적역학삼수，재차기출상이용유한원연건 ABAQUS，개전료근해대직경단장기출재수평하재작용하적삼유유한원수치분석，게시료가재과정중장주토적응력로경，탐토료장주토내마찰각、전창각급장토접촉면특성등대삼유수치분석결과적영향，득도료리심모형시험적험증，진이제출료사토해상중대직경단장기출적합리수치분석모형급삼수취치방법，병건의풍궤대직경단장기출수평승재력학정이변형작위공제표준。재차기출상，이용해수치분석모형분석료현유장기승재력화변형분석방법대초대직경단장적유효성，병제출료채용수치분석래학정기출적림계매심적학정방법。
A series of consolidated drained (CD) triaxial compression tests on sand with dilatancy is conducted to obtain mechanical parameters. The behaviors of large diameter monopile foundation in offshore under horizontal loading are analyzed using a three-dimensional finite element model with the finite element software ABAQUS. A lot of parameters, like stress path, friction angle, dilatancy angle and the characteristics of soil-pile surface, are taken into consideration to study the soil structure behavior, which is verified with the centrifuge modeling. Then, a reasonable finite element computational model of large diameter monopile foundation under horizontal loading including the parameter selection method of this model is established. Besides, the deformation is proposed as the control criterion to determine the horizontal bearing capacity of monopile foundation for the offshore wind turbine. With that, the pros and cons of existing methods for analyzing horizontal bearing capacity and deformation of pile foundation are discussed. Finally, it is suggested to determine the critical embedded length of monopile foundation by numerical analysis.