Ma Jian, Xu Junyue, Fan Zhenkai, Li Hui, Xu Gang
College of Civil Engineering and Architecture, Wenzhou University, Wenzhou, China.
Jinhua Electric Power Design Institute Co., Ltd, Jinhua, China.
Sci Prog. 2024 Apr-Jun;107(2):368504241260268. doi: 10.1177/00368504241260268.
The bearing and deformation characteristics of monopile foundation under the monotonic and cyclic loads are key factors to consider in the design of the transmission tower structure or offshore wind energy converters. The model tests and numerical simulations of monopile foundation under monotonic and cyclic horizontal loads were performed in sand to explore the bearing characteristics and the deformation characteristics of pile. The potentially affected factors including loading height, relative density of soil, displacement amplitude were analyzed. The results show that with the loading height varies from 1 to 4, the horizontal static bearing capacity of the pile under different the soil relative density decreased by 1.63-1.9 times, and the peak bending moment increased by 22.9%-36.8%. Under the cyclic loads, the peak load on the pile top increased by 31.7%-56.1% for each 1 mm increase in displacement amplitude. The stiffness of soil around pile varies as the number of cycles increases with the development trend of decreases first and then increases gradually. As the horizontal load and cycle number increase, the range of the displacement of soil extends towards the bottom of pile, until it covers the entire lower part of the model.
单桩基础在单调和循环荷载作用下的承载和变形特性是输电塔结构或海上风力发电装置设计中需要考虑的关键因素。在砂土中对单桩基础在单调和循环水平荷载作用下进行了模型试验和数值模拟，以探究桩的承载特性和变形特性。分析了包括加载高度、土的相对密度、位移幅值等可能影响的因素。结果表明，随着加载高度从1变化到4，在不同土相对密度下桩的水平静承载力降低了1.63 - 1.9倍，峰值弯矩增加了22.9% - 36.8%。在循环荷载作用下，位移幅值每增加1mm，桩顶的峰值荷载增加31.7% - 56.1%。桩周土的刚度随着循环次数的增加而变化，呈现出先减小后逐渐增大的发展趋势。随着水平荷载和循环次数的增加，土体位移范围向桩底延伸，直至覆盖模型的整个下部。
