Numerical investigation of the installation process and bearing capacity of circular helicoid piles in undrained clay

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL Soils and Foundations Pub Date : 2023-12-29 DOI:10.1016/j.sandf.2023.101411

Kunpeng Wang , Chunyi Cui , Peng Zhang , Noriyuki Yasufuku , Guangli Xu , Meng Wang

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Abstract

The circular helicoid pile (CH pile) is a special-shaped pile with outstanding axial bearing properties developed in the last ten years, its pile-soil interaction problem has nonplanar strain and is non-axisymmetric. The coupled Eulerian-Lagrangian (CEL) method was applied to simulate the entire process of installation, axial compression and pullout loading of the CH pile in undrained clay to assess the interaction between the pile and soil, and the accuracy of the CEL model was verified by in-situ test results. The surfaces of the CH pile were divided into the bottom surface, outer and inner surfaces, with the inner surfaces including compressive and pullout surfaces. The variation in axial forces and moments on the CH pile and its various types of surfaces in the whole process of installation and bearing was clarified and the relative contribution of reacting forces and moments on various surfaces to the total resistance of the pile was evaluated. The stress distribution characteristics of the soil around the pile and the pile-soil interfaces after the installation of the CH pile and under the ultimate limit state were obtained, and then the force states of inner surfaces in the whole process of installation and bearing were analysed.

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不排水粘土中圆形螺旋桩的安装过程和承载力的数值研究

圆形螺旋桩（CH 桩）是近十年来发展起来的一种轴向承载性能优异的异形桩，其桩土相互作用问题具有非平面应变和非轴对称的特点。本文采用欧拉-拉格朗日（CEL）耦合方法模拟了未排水粘土中 CH 桩的安装、轴向压缩和拔出加载的全过程，以评估桩与土之间的相互作用，并通过现场试验结果验证了 CEL 模型的准确性。CH 桩的表面分为底面、外表面和内表面，其中内表面包括抗压和抗拔表面。明确了 CH 桩及其各类表面在整个安装和承载过程中的轴向力和力矩的变化，并评估了各表面的反作用力和力矩对桩的总阻力的相对贡献。获得了 CH 桩安装后和极限状态下桩周围土体和桩土界面的应力分布特征，进而分析了安装和承载全过程中内表面的受力状态。

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来源期刊

Soils and Foundations 工程技术-地球科学综合

CiteScore

6.40

自引率

8.10%

发文量

审稿时长

5 months

期刊介绍： Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.