Comparison of Lateral Behavior of Rock-Socketed Large-Diameter Offshore Monopiles in Sands with Different Relative Densities
Comparison of Lateral Behavior of Rock-Socketed Large-Diameter Offshore Monopiles in Sands with Different Relative Densities
复制标题
不同相对密度砂土中嵌岩大直径海上单桩的横向性能比较
DOI：
10.17736/ijope.2015.hb14
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发表时间：
2015
影响因子：
0.8
通讯作者：
K. Kwak
中科院分区：
文献类型：
--
作者：
Dongwook Kim;Y. Choo;K. Kwak
通过波浪试验研究了桑迪层的相对密度对直径为6 m的离岸桩横向响应的影响。桩的端头嵌入岩石承载层中。为了模拟不同相对密度（密实和中等密实砂层）砂中的嵌岩桩，在60 g加速度下使用仪器齐全的模型桩在显著的侧向载荷和弯矩下进行离心试验。根据离心试验结果，对于密实和中密实砂层，p-y关系和初始刚度（p-y曲线的初始梯度）随深度的增加而变化。结果表明，本文所建立的大直径嵌岩桩的p-y曲线与现有的API（American Petroleum Institute）p-y曲线有很大的不同，后者是基于相对较小直径的打入桩而建立的。结果表明，在浅埋处，中密砂层的初始刚度显著低于密砂层;随着深度的增加，中密砂层与密砂层的初始刚度之比显著减小，并逐渐接近刚性基岩层。
Centrifuge tests were performed to investigate the effect of the relative density of the sandy layer on the lateral response of 6-m-diameter offshore monopiles. The end tips of the monopiles are socketed into rock-bearing layers. For the simulation of the rock-socketed monopiles in sands with different relative densities (dense and medium dense sand layers), centrifuge tests at an acceleration of 60 g were conducted using well-instrumented model monopiles under significant lateral loads and bending moments. Based on the centrifuge test results, the p–y relationship and the initial stiffness (initial gradient of a p–y curve) changed with an increasing depth for both dense and medium dense sand layers. As a result, the newly developed p–y curves for rock-socketed large-diameter monopiles in this study were quite different from the existing API (American Petroleum Institute) p–y curves, which were developed based on relatively small-diameter driven piles. It was found that the initial stiffness for the medium dense sand layer was significantly lower than that for the dense sand layer at a shallow depth; however, the ratio of initial stiffness of the medium dense sand layer to that of the dense sand layer decreases significantly as the depth increases and approaches the stiff rock-bearing layer.