《Journal of Geotechnical and Geoenvironmental Engineering》杂志刊登“砂土中吸力式沉箱基础的长期横向周期响应”

作者：B. Zhu; B. W. Byrne; and G. T. Houlsby

刊物：《Journal of Geotechnical and Geoenvironmental Engineering》，2013年1月，139卷第1期，73–83页

关键词：吸力式沉箱；海上风机；循环加载；旋转；沉降；刚度；浅基础

摘要：对于海上风机的单桩基础，一般认为带翼式重力桩基础和吸力式沉箱基础是可行的选择。近期的研究主要集中于浅基础的单一弯矩-转角响应问题，因此也必须对风机寿命期内的周期响应和转角累积进行分析研究。本文进行了采用不同加载特点并作用于一个松砂中的浅基础（一个沉箱）模型上的循环加载试验，循环周期约为1000。基于这些试验，提出了一个用于评估循环荷载引起的累积转角的准则，也对沉箱的沉降和循环刚度响应做出了评估。结果表明：沉箱的累积沉降随着周期数和周期振幅的增大而增大，与预期结果相同。结果还表明：当一个周期荷载体系介于单向和完全双向之间循环时会产生最大的旋转，然而循环刚度却不受周期数的影响。在采用适当的缩尺技术后，本文提出的准则可用于预测足尺单一沉箱结构的长期累积转角。

Long-Term Lateral Cyclic Response of Suction Caisson Foundations in Sand

Authors: B. Zhu; B. W. Byrne; and G. T. Houlsby

Journal: Journal of Geotechnical and Geoenvironmental Engineering, Volume 139, Issue 1 (January 2013), 73–83

Key words: Suction caisson, Offshore wind turbine, Cyclic loading, Rotation, Settlement, Stiffness, Shallow foundation

Abstract: Skirted gravity base foundations and suction caisson foundations are considered as viable alternatives to monopile foundations for offshore wind turbines. While recent work has focused on the monotonic moment-rotation response for shallow foundations, the cyclic response and the accumulation of rotation over the life of the turbine must also be addressed. This paper presents cyclic loading tests where approximately 10,000 cycles, with different loading characteristics, were applied to a model shallow foundation (a caisson) in loose sand. On the basis of these tests, a framework for assessing the accumulated angular rotation because of cycling was developed. The settlement and cyclic stiffness response of the caisson were also assessed. It was found, not unexpectedly, that the accumulated settlement of the caisson increased with the number of cycles and cyclic amplitude. It was also found that a cyclic loading regime intermediate between one-way and full two-way cycling produced the largest rotations. The cyclic stiffness was relatively unaffected by the number of cycles. Using an appropriate scaling technique, the proposed framework was used to predict the long-term accumulated angular rotation, for an example, the field-scale monocaisson structure.

原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000738