Installation of open-ended piles: A numerical investigation into the effects on the state of silica sand

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations Pub Date : 2024-04-02 DOI:10.1016/j.sandf.2024.101458

Michail Spyridis, Susana Lopez-Querol

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引用次数: 0

Abstract

Up to this day, there are great uncertainties in the design procedures of monopiles, especially concerning the soil state condition and penetration response during their installation. A numerical model, based on the Coupled Eulerian method and using the hypoplastic law with intergranular strain, is proposed and validated in this paper, after which a series of open-ended pile installation tests have been carried out numerically, to investigate the influence of the jacked installation on the initial conditions for three types of silica sand. A range of soil densities and pile diameters is considered in this analysis. A full investigation of the installation forces, stress level, changes in volume-stress level and voids ratio is conducted. The numerical solution provided a correlation between the penetration resistance and the granulometric properties of the studied sands. Subsequently, the radial stresses in the surrounding soil mass are correlated with the type of sand and its relative density. The stress-volume state of a set of points in the soil domain during installation is presented and discussed from the critical state framework, revealing the contribution of the in-situ state in the pile installation. Finally, the lateral earth pressure resulting after installation is presented.

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安装开口桩：对硅砂状态影响的数值研究

时至今日，单桩的设计程序仍存在很大的不确定性，尤其是在安装过程中的土壤状态和渗透反应。本文提出并验证了一个基于耦合欧拉法的数值模型，该模型使用了具有晶间应变的次塑性定律，随后通过数值方法进行了一系列开口桩安装试验，以研究三种硅砂的顶进安装对初始条件的影响。分析中考虑了一系列土壤密度和桩直径。对安装力、应力水平、体积应力水平变化和空隙率进行了全面研究。数值解法提供了所研究砂土的抗穿透性与粒度特性之间的相关性。随后，周围土体中的径向应力与砂的类型及其相对密度相关联。从临界状态框架出发，介绍并讨论了安装过程中土域中一组点的应力-体积状态，揭示了原位状态在桩安装过程中的作用。最后，介绍了安装后产生的侧向土压力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.