A semi-analytical solution for the load-transfer behaviors of precast concrete pile reinforced by cemented soil with long-core in layer soils

IF 6.2 1区工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Computers and Geotechnics Pub Date : 2025-09-26 DOI:10.1016/j.compgeo.2025.107665

Chaozhe Zhang , Roberto Cudmani , Songyu Liu , Dingwen Zhang , Zhen Wang , Pan Zhou

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Abstract

Precast Concrete Piles Reinforced by Cemented Soil (PCCS), a novel composite pile, has been widely employed for soft ground treatment. In this technique, the precast concrete (PC) pile is installed in the center of a deep mixing (DM) column, thereby effectively harnessing the benefits of both technologies. However, modelling the load transfer of the composite pile is quite complex due to the different materials (soft soil, cemented soil and concrete) and interfaces (soft soil-cemented soil, soft soil-concrete, cemented soil-pile) involved. Particularly, studies on the axial load-transfer behavior of the PCCS with long-core (inner core), in which the PC piles is significant longer than the DM columns, remain limited. This contribution proposes an 1D semi-analytical load transfer model for the PCCS with long-core in layered soils, which takes into account the shear force transfer at the different interfaces and the mechanical behavior of the natural soil, cemented soil, the pile and the interface. By comparing and analyzing the mechanical responses of PCCSs under loads applied to the inner core head (loading mode I) and the entire cross-section of the PCCSs (loading mode II), the ability of the model to describe the experimental behavior is investigated. The results indicate that the distribution of the axial force along the pile shaft and the skin friction resistance at the interfaces of the PCCS with long-core can be realistically reproduced by the model. It is observed that the ultimate bearing capacity of the PCCS under loading mode II is about 15% higher than that under loading mode I.

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层状土中长芯水泥土加筋预制混凝土桩荷载传递特性的半解析解

水泥土加固预制混凝土桩是一种新型的复合桩，在软土地基处理中得到了广泛的应用。在这种技术中，预制混凝土（PC）桩安装在深层搅拌（DM）柱的中心，从而有效地利用了两种技术的优势。然而，由于涉及不同的材料（软土、水泥土和混凝土）和界面（软土-水泥土、软土-混凝土、水泥土-桩），复合桩的荷载传递建模相当复杂。特别是，对于长芯（内芯）PCCS的轴向荷载传递特性的研究仍然有限，其中PC桩明显长于DM柱。本文提出了层状土中长芯桩的一维半解析荷载传递模型，该模型考虑了不同界面处的剪力传递以及天然土、水泥土、桩和界面的力学行为。通过比较和分析pccs在内芯头（加载模式I）和pccs整个截面（加载模式II）载荷作用下的力学响应，研究了该模型描述试验行为的能力。结果表明，该模型能较好地再现长芯混凝土混凝土桩沿桩身的轴力分布和界面处的摩阻力分布。结果表明，加载模式II下PCCS的极限承载力比加载模式I下的极限承载力高约15%。

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

Computers and Geotechnics 地学-地球科学综合

CiteScore

9.10

自引率

15.10%

发文量

438

审稿时长

45 days

期刊介绍： The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.