摘要
用ABAQUS有限元软件分析大尺度海上风电筒型基础在风荷载作用下的响应,通过改变土质参数(土体密度、弹性模量、粘聚力和内摩擦角等)和荷载幅值,主要研究沉降的发展和周围土体的反应。研究表明:土体的强度越大,筒的沉降及其对周围土体的影响范围越小;荷载幅值越大,筒的沉降及其对周围土体影响范围越大,在土体强度和荷载幅值两个影响因素中,荷载幅值的影响更为明显。在加载过程中早期阶段,土体不会沉降,但其影响区域明显,随荷载幅值的逐渐增大,筒周围的土体会产生凹形沉降;后期阶段,筒逐渐沉降,土层逐渐固结,随着已发生沉降的土的固结和筒的沉降,筒与土的相对运动最终将达到一个稳定的阶段。地基土及筒型基础在水平循环荷载作用下的累积变形与蠕变过程相似。
The large-scale bucket foundation for offshore wind turbine has a great advantage on bearing the horizontal dynamic loading. The response of the bucket foundation under wind load was analyzed by finite element software ABAQUS. The settlement of the bucket foundation and the response of soil surroundings were mainly researched by various soil parameters （ soil density, elasticity modulus, cohesion and internal friction angle etc. ）, the amplitude and the frequency of the load. The research results showed that the larger the soil strength is, the smaller the settlement of the bucket and the influence to soil surroundings will be ; the larger the load amplitude is, the larger settlement of the bucket and the influence to soil surroundings will be. By contrast, the load amplitude factor is more influential. At the beginning of the loading process of loading, the settlement of the soil surroundings of the bucket doesn＇ t occur, but the influence area is very obvious. The soil surroundings of the bucket would be decreased and formed concave settlement with the increasing of the loading amplitude. At the later stage of the loading process, the bucket settles and the soil layer consolidates gradually. With the consolidation of the soil layer and settlement of the bucket, the movement of the soil layer and the bucket reach a stable state. The cyclic cumulative deformation of soil and the bucket generated by cyclic loads were similar to the creep.
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2013年第12期2108-2114,共7页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(51109160)
国家高技术研究发展(863)计划(2012AA051705)
国家国际科技合作专项(2012DFA70490)
关键词
大尺度筒型基础
数值分析
风荷载
沉降
影响区域
蠕变
large-scale suction bucket foundation
numerical analysis
wind load
settlement
influence area
creep
