Lateral behavior of large-diameter monopiles in clay using transparent soil and centrifuge tests

IF 5.6 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Acta Geotechnica Pub Date : 2024-11-26 DOI:10.1007/s11440-024-02463-0

Guangwei Cao, Siau Chen Chian, Xuanming Ding, Zhibo Chen, Peng Zhou

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Abstract

The response characteristics of large-diameter monopiles under lateral loads greatly differ from those of traditional small-diameter piles. By means of transparent soil and centrifuge tests, as well as numerical analyses, the soil flow mechanism and lateral behavior of large-diameter monopiles in soft clay were investigated. The study result reveals that a rotational failure mechanism, different from wedge-full-flow mechanisms, exists in the large-diameter monopile–soil system. For stubby large-diameter monopiles, using the classic wedge-full-flow mechanisms can lead to an overestimation of lateral capability due to its absence in considering the rotational mechanism. In addition, the normalized p–y curves in the rotational soil flow zone are also observed to have larger initial stiffness and attain yield plateau earlier than those in wedge-full-flow zone. Differences in N_p values among different centrifuge tests are partly attributed to the different means of obtaining the clay’s undrained shear strength. When the undrained strength from consolidated undrained triaxial tests is taken, consistent values of N_p originating from different test results are observed. Finally, based on the results from centrifuge tests and well-calibrated numerical analyses, an empirical formulation of N_p for large-diameter monopiles in soft clay is proposed.

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用透明土和离心试验研究粘土中大直径单桩的横向特性

大直径单桩在横向荷载作用下的响应特性与传统的小直径桩有很大的不同。通过透明土、离心试验和数值分析，研究了软粘土中大直径单桩的土流机理和横向特性。研究结果表明，大直径单桩-土体系存在不同于楔形-全流机制的旋转破坏机制。对于粗短的大直径单桩，由于没有考虑旋转机制，使用经典的楔形全流机制可能会导致对横向能力的高估。此外，土轮转流区归一化p-y曲线的初始刚度也比楔形全流区大，且较早达到屈服平台。不同离心试验中Np值的差异部分归因于黏土不排水抗剪强度获取方法的不同。取固结不排水三轴试验不排水强度时，不同试验结果得出的Np值一致。最后，基于离心试验结果和校准良好的数值分析，提出了软粘土中大直径单桩的Np经验公式。

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来源期刊

Acta Geotechnica ENGINEERING, GEOLOGICAL-

CiteScore

9.90

自引率

17.50%

发文量

297

审稿时长

4 months

期刊介绍： Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.