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吸力式桶形基础广泛地应用于海洋油气开发的海洋平台。在冬季,渤海冰排会对平台产生强烈的冲击,引起振动。本文介绍了一套用于土工离心机实验的动力加载设备,并介绍了该套设备在模拟吸力式桶形基础在受到等效动冰载作用下的响应的实验研究情况及实验结果。结果表明,当载荷幅值超过一个临界值时,地基上部会发生软化甚至液化。超孔隙水压从土体上部到下部,从桶形基础壁面到远处逐渐减小。在动载荷作用下,桶形基础和临近土体会发生大的沉降。桶形基础尺寸越小,动载荷响应越大。
Suction bucket base is widely used in offshore oil and gas development offshore platform. In winter, the Bohai Sea ice will have a strong impact on the platform, causing vibration. In this paper, a set of dynamic loading equipment for geotechnical centrifuge experiment is introduced, and the experimental research and experimental results on the response of the set of equipment to simulated suction bucket foundation subjected to equivalent dynamic ice loading are introduced. The results show that when the load amplitude exceeds a critical value, the top of the foundation will soften and even liquefy. Pore pore water pressure from the upper part of the soil to the lower part, from the barrel-shaped base wall to the far away gradually reduced. Under dynamic load, large settlement will occur on the bucket foundation and adjacent soil. The smaller the barrel basic size, the greater the dynamic load response.