为研究桩式可调风电机组基础在顶升过程中的纠偏响应以及顶升力的计算方法,采用室内模型试验与数值模拟相结合的综合研究方法,对顶升过程中反力桩及周边土体的响应进行探究,并对纠偏顶升力进行因素分析。基于能量守恒定律提出适用于该基础结构形式的顶升力计算方法,同时利用数值模拟以及室内模型试验检验了该顶升力计算理论的合理性。结果表明,随顶升力的施加,基底非纠偏侧受压面不断减小,基础纠偏中性轴向非纠偏侧发生偏移,各桩体沉降发生改变;土体重度、黏聚力以及上部荷载等因素对顶升影响范围无明显影响,但与顶升力呈线性相关;而土体内摩擦角与埋深显著影响土体的剪切范围,导致顶升力呈非线性变化,其中内摩擦角与顶升力呈明显负相关,而埋深与顶升力则显著正相关。提出的顶升力计算方法与模型试验和数值模拟结果吻合较好。
Abstract
To study the rectification response of the foundation of the pile-type adjustable wind turbine during the jacking process and the calculation method of the jacking force, a comprehensive research method combining indoor model tests and numerical simulations was adopted to explore the responses of the reaction piles and the surrounding soil during the jacking process, and to conduct factor analysis on the correction jacking force. This approach aims to delve into the complex interaction between the reaction pile and the surrounding soil during jacking process, while also conducting a thorough factor analysis of the jacking force. Based on the principle of energy conservation, a method for calculating the jacking force tailored to this type of foundation is proposed. The reliability and effectiveness of this method are subsequently verified through numerical simulations and laboratory model tests. The findings reveal that upon application of a jacking force, the compression surface located on the non-rectification side of the foundation continuously decreases. Furthermore, the rectification neutral axis of the foundation shifts towards the non-rectification side, resulting in the settlement of each pile change. It is noteworthy that factors such as soil gravity, cohesion, and upper load exert insignificant influencing on the scope of jacking impact, but they demonstrate a linear correlation with the jacking force. Conversely, the internal friction angle of the soil and the embedded depth of pile significantly influence the shear range of soil, resulting in nonlinear variations in the jacking force. Specifically, a negative correlation is observed between the jacking force and the internal friction angle, whereas a positive correlation is evident with the embedded depth. The proposed method for calculating the jacking force aligns well with the results obtained from both model testing and numerical simulations.
关键词
风电机组 /
因素分析 /
能量守恒 /
纠偏 /
室内模型试验
Key words
wind turbines /
factor analysis /
energy conservation /
rectification /
laboratory model tests
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基金
山东省自然科学基金（ZR2019BEE076）
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