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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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.