在风电行业快速发展、风电项目风电机组基础成本居高不下的背景下,提出一种基于筒型基础带支撑梁的新型陆上风电机组基础型式——梁筒基础。通过建立有限元模型,得到梁筒基础相对筒形基础在C40混凝土用量上减小了49%;研究得到梁筒基础支撑梁数量与水平极限承载力的关系,支撑梁数量的最佳取值范围在4n12;梁筒基础在黏黏性土中承载性能更优。通过开展缩尺模型试验,验证了数值分析中有限元模型的准确性,得到在相同混凝土体量下梁筒基础与筒型基础的极限承载力比值为1.73∶1,达到极限承载力时基础顶部水平位移比值为0.68∶1。研究表明梁筒基础在承载力、材料耗量、位移控制方面具有优势。
Abstract
A new type of onshore wind turbine foundation based on tube foundation with supporting beams, braced tube foundation, was proposed on the backdrop of the rapid development of the wind power industry and the high costs of the wind turbine foundation. By establishing a finite element model, the quantity of C40 concrete used for braced tube foundation are reduced by 49% compared to tube foundation. The relationship between the number of supporting beams of braced tube foundation and the ultimate horizontal bearing capacity has been studied, and it is found that the optimal range for the number of supporting beams is 4<n<12 and braced tube foundation has stronger load-bearing performance in cohesive soil. By conducting a scaled model experiment, it is verified that the accuracy of the finite element model and found that the ultimate bearing capacity ratio of the braced tube foundation to the tube foundation is 1.73∶1 under the same concrete volume, and the top horizontal displacement ratio is 0.68∶1 when the ultimate bearing capacity is reached. It shows that the braced tube foundation has advantages in bearing capacity, material consumption, and displacement control.
关键词
风电机组 /
承载力 /
数值模拟 /
缩尺模型试验 /
梁筒基础
Key words
wind turbine generators /
bearing capacity /
numerical simulation /
scaled model experiment /
braced tube foundation
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