CAJ | 학술논문

桩周土体的力学响应规律对近海风机桩基础的变形和稳定性有重要影响。采用有限元方法对一个概化的近海风机单桩基础进行数值模拟，着重分析动荷载作用下桩基础和桩周土的变形规律、桩周土应力作用特征及应力主轴的旋转模式。发现桩周土体各方向的应力分量随循环荷载的作用呈现出周期性的往返变化，第一周期的应力路径与继后周期的应力路径明显不同，浅层桩周土存在显著的应力主轴往复旋转，旋转幅度可达60°。
장주토체적역학향응규률대근해풍궤장기출적변형화은정성유중요영향。채용유한원방법대일개개화적근해풍궤단장기출진행수치모의，착중분석동하재작용하장기출화장주토적변형규률、장주토응력작용특정급응력주축적선전모식。발현장주토체각방향적응력분량수순배하재적작용정현출주기성적왕반변화，제일주기적응력로경여계후주기적응력로경명현불동，천층장주토존재현저적응력주축왕복선전，선전폭도가체60°。
The mechanical behavior of soil plays a significant role in the deformation and stability of the pile foundations of offshore wind turbines.The soil’s stress path around the pile foundation is complex under the wind and wave loadings.This paper conducts a numerical simulation for a simplified pile foundation using the finite element method (FEM),and studies the deformation, stress path,and rotation mode of the principal stress axes under cyclic loadings.We found that the soil’s stress components around a pile foundation show periodical variation with an increasing number of cycles.The stress path in the first cycle is significantly different from that in subse-quent cycles.We observed a marked repetitive rotation of the principal stress axes in the shallow region of the soil foundation and the rotation amplitude that it can reach.