海上临坡宽浅式筒型基础承载特性研究
BEARING CAPACITY ANALYSIS OF LARGE DIAMETER AND SHALLOW BURIED BUCKET FOUNDATION NEAR SLOPE FOR OFFSHORE WIND TURBINE
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摘要: 采用有限元分析方法,分析砂土中海上临坡大直径宽浅式筒型基础在单一荷载作用下极限状态承载特性和土体破坏特征,复合荷载作用下的基础变形和土压力分布情况。研究表明:筒基竖直极限承载力随坡角和临坡距线性变化,当临坡距大于0.2D时,水平极限承载力折减小于15%。当边坡坡角小于30°时,临坡距离对弯矩极限承载力影响不大。复合荷载作用下,埋深4 m以上临坡侧筒基外壁土压力随临坡距的增加而增加,其余侧壁土压力受临坡距变化影响较小。Abstract: The finite element method is used to study the ultimate bearing characteristics and failure mode of the large diameter and shallow buried bucket foundation for offshore wind turbines in sandy slope under monotonic loads and combined load conditions.The analysis results show that the vertical ultimate bearing capacity of the bucket foundation varies linearly with the slope angle and the distance to the slope.When the distance to slope is larger than 0.2 D,the horizontal ultimate bearing capacity reduction is below 15%.When the slope angle is less than 30°,the influence of the distance to the slope on the ultimate bearing capacity of the bending moment is little.Under the combined load condition,the earth pressure increases with the increase of the slope distance for the outer bucket wall with a buried depth deeper than 4 meters in slope side,but it is not obvious in the rest area of bucket wall.
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