Field and 3D numerical investigation on bearing characteristics of the long-core SDCM piles under vertical load in sandy soil

IF 5.6 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Acta Geotechnica Pub Date : 2025-01-17 DOI:10.1007/s11440-025-02533-x

Zhiyu Gong, Guoliang Dai, Weiwei Xu, Xinsheng Chen, Hongbo Liu

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引用次数: 0

Abstract

The stiffened deep cement mixing (SDCM) pile is a new composite pile type, which is a stiffened core inserted into the cemented soil, compared to the DCM pile structure. The SDCM pile not only combines the advantages of DCM piles, but also improves the corresponding bearing capacity. In this paper, the bearing characteristics (the ultimate bearing capacity, the pile end resistance and the pile side friction) of PHC pipe pile and the long-core SDCM piles with number of different piles are investigated through field tests. The ultimate bearing capacities of PHC pipe pile, the long-core SDCM pile and the double long-core SDCM pile are 5.82, 8.23 and 14.67 MN. Combined with finite element analysis, it was found that the long-core SDCM pile is a friction pile in sandy soil, the cemented soil can provide lateral friction resistance and its role in bearing the vertical load is cannot be ignored. Parametric analyses were carried out for parameters: the length ratio of the cemented soil and PHC pipe pile (L_C/L_P), the radius ratio of the cemented soil and PHC pipe pile (R_C/R_P) and the modulus of elasticity of PHC pipe pile (E_P) on the long-core SDCM pile with the objective of ultimate bearing capacity. The ultimate bearing capacity will be increased with increasing in L_C/L_P and R_C/R_P, and changes in E_P will not affect the ultimate bearing capacity. Finally, the bearing capacity equations of the long-core SDCM pile were adjusted with the results of the study.

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沙土中SDCM长芯桩竖向荷载承载特性的现场及三维数值研究

与DCM桩结构相比，SDCM桩是一种新型的复合桩类型，它是在水泥土中插入一个加劲芯。SDCM桩既结合了DCM桩的优点，又提高了相应的承载力。本文通过现场试验研究了PHC管桩和不同桩数的长芯SDCM桩的承载特性（极限承载力、桩端阻力和桩侧摩阻力）。PHC管桩、长芯SDCM桩和双长芯SDCM桩的极限承载力分别为5.82、8.23和14.67 MN。结合有限元分析发现，长芯SDCM桩为砂质土中的摩擦桩，水泥土可提供侧摩阻力，其承受竖向荷载的作用不可忽视。以极限承载力为目标，对长芯SDCM桩上的水泥土与PHC管桩长度比（LC/LP）、水泥土与PHC管桩半径比（RC/RP）、PHC管桩弹性模量（EP）等参数进行了参数化分析。极限承载力随LC/LP和RC/RP的增大而增大，EP的变化不影响极限承载力。最后，根据研究结果对长芯SDCM桩的承载力方程进行了调整。

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

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.