本文選題：吸力桶 + 近海風機�。� 參考：《浙江大學》2013年碩士論文

【摘要】：風能作為重要和最成熟的可再生能源,是全球能源發(fā)展戰(zhàn)略的重要方向。中國具有豐富的近海風能資源,大力發(fā)展海上風電具有重要意義。作為風機上部荷載的最終承擔者,地基基礎是風電機組設計的重要內(nèi)容。吸力式桶形基礎因其造價低、施工方便等優(yōu)點,顯示出可觀的工程應用前景。針對國內(nèi)逐漸增多的建設于粉土、砂土海床地基的近海風機,本文通過大比例1g模型試驗獲得了粉土中吸力式桶形基礎變形及受力特性�？紤]風機基礎正常運行時須嚴格控制其轉(zhuǎn)動角,研究了吸力桶基于變形控制的承載力分析方法。 通過在砂質(zhì)粉土中開展的一系列不同尺寸的單桶基礎傾覆加載模型試驗,研究其在豎向力、水平力和彎矩荷載共同作用下的變形機制和承載性能,試驗結(jié)果揭示了桶直徑、高寬比和加載偏心比對桶基無量綱彎矩承載力的影響,以及不同桶基轉(zhuǎn)動中心位置�；谕盎冃魏屯巴料嗷プ饔脵C理,提出了新的基于變形控制的復合承載力分析方法,并討論了計算參數(shù)的確定方法。該分析方法可對粉土中模型試驗和砂土中現(xiàn)場試驗的彎矩-轉(zhuǎn)角曲線進行較好的預測,使任意允許轉(zhuǎn)角對應的承載力計算成為可能。進一步的研究表明,被動區(qū)桶裙外壁上土壓力和桶土摩阻力對桶基彎矩承載力貢獻最大,具體桶基高寬比和水平地基抗力常數(shù)對彎矩承載力影響最大。 針對多桶基礎,本文重點考慮其抵抗風浪荷載時上拔桶的作用。通過系列不同尺寸的單桶基礎上拔加載模型試驗,研究了不同加載速率對上拔承載力的影響以及桶內(nèi)負壓的作用,以及土體對桶體上拔的響應。在此基礎上對多桶基礎進行了水平靜力和循環(huán)加載模型試驗,利用三自由度力傳感器獲得各桶真實受荷情況。通過試驗討論了多桶基礎極限傾覆承載力分析方法,研究了多桶基礎在不同荷載水平下的循環(huán)累積變形以及各桶的受力發(fā)展。
[Abstract]:As an important and most mature renewable energy, wind energy is an important direction of global energy development strategy. China has abundant offshore wind energy resources, and it is of great significance to develop offshore wind power. As the ultimate bearer of wind turbine upper load, foundation is an important part of wind turbine design. Suction bucket foundation has the advantages of low cost and convenient construction. In this paper, the deformation and mechanical characteristics of suction bucket foundation in silty soil are obtained by large scale 1 g model test in view of the increasing offshore fan built on silt and sand seabed foundation in China. Considering the need to strictly control the rotation angle of fan foundation in normal operation, the bearing capacity analysis method of suction bucket based on deformation control is studied. A series of model tests on overturning load of single bucket foundation with different sizes are carried out in sandy silty soil. The deformation mechanism and bearing capacity of the bucket under the combined action of vertical force, horizontal force and moment load are studied. The experimental results reveal the influence of bucket diameter, aspect ratio and loading eccentricity ratio on the dimensionless moment bearing capacity of bucket foundation. And different barrel base rotation center position. Based on the mechanism of bucket foundation deformation and bucket soil interaction, a new composite bearing capacity analysis method based on deformation control is proposed, and the determination method of calculation parameters is discussed. This method can be used to predict the bending moment-angle curves of model tests in silty soil and field tests in sand, which makes it possible to calculate the bearing capacity corresponding to any allowable rotation angle. Further study shows that the earth pressure and soil friction on the outer wall of the bucket skirt in the passive zone contribute most to the bending moment bearing capacity of the bucket foundation, and the ratio of height to width of the bucket foundation and the resistance constant of the horizontal foundation have the greatest influence on the moment bearing capacity of the bucket foundation. This paper focuses on the role of bucket pullout when it is used to resist wind and wave loads. The effects of different loading rates on the uplift bearing capacity, the negative pressure in the bucket and the response of the soil to the uplift of the bucket were studied through a series of model tests of pull-out on a single bucket foundation with different dimensions. On this basis, the horizontal static and cyclic loading model tests of multi-bucket foundation are carried out, and the real loading conditions of each bucket are obtained by using the three-degree-of-freedom force sensor. The ultimate overturning bearing capacity analysis method of multi-bucket foundation is discussed through experiments. The cyclic cumulative deformation of multi-bucket foundation under different load levels and the development of each bucket are studied.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU473.1

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本文編號：1999195