针对湿陷性黄土地区风电桩基础负摩阻力的计算问题,该文开展了大比例尺室内模型试验,统计了类似工程的现场试验数据,探讨了黄土浸水完成后湿陷下陷深度、中性点深度及负摩阻力最大值深度与桩长径比的关系后,通过线性拟合得到中性点深度及负摩阻力最大值深度与湿陷下陷深度和桩长径比的表达式,在此基础上建立湿陷性黄土地区风电桩基础负摩阻力的计算方法。将该文方法和桩基规范方法计算得到的结果分别与实测结果进行比较,结果表明,该文计算方法得到的下拉荷载较桩基规范更接近实际情况,该成果可为类似的桩基工程设计提供参考。
Abstract
To address the issue of calculating negative skin friction for wind turbine pile foundations in collapsible loess areas, this paper conducts large-scale indoor model tests and compiles field test data from similar projects. After investigating the relationships between the collapsible settlement depth of loess after complete immersion, the depth of the neutral point, the depth of maximum negative skin friction, and the pile length-to-diameter ratio, expressions for the depth of the neutral point and the depth of maximum negative skin friction in terms of collapsible settlement depth and pile length-to-diameter ratio are derived through linear fitting. On this basis, a method for calculating negative skin friction of wind turbine pile foundations in collapsible loess areas is established. The results calculated by the proposed method and the method specified in the pile foundation code are compared with the measured results respectively. The findings indicate that the downward pull load calculated by the method in this paper is closer to the actual situation than that obtained using the pile foundation code. This achievement can provide a reference for the design of similar pile foundation projects.
关键词
湿陷性黄土 /
陆上风电 /
桩基础 /
负摩阻力 /
模型试验
Key words
collapsible loess /
onshore wind power /
pile foundation /
negative frictional resistance /
model test
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基金
兰州交通大学-对口支援高校联合创新基金项目（LH2023018）
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