Model and numerical analyses of screw pile uplift in dry sand

IF 3 3区工程技术 Q2 ENGINEERING, GEOLOGICAL

Canadian Geotechnical Journal Pub Date : 2023-09-08 DOI:10.1139/cgj-2022-0368

Yadong Chen, An Deng, Honghua Zhao, Chengzhong Gong, Huasheng Sun, Jiangdong Cai

引用次数: 0

Abstract

This study investigated the performance of screw piles under uplift. The screw piles were installed in sand in the laboratory and uplifted to evaluate the effects of the screw thread pitch and relative density of sand on the pile uplift capacity. The uplift capacity was compared with that of the shaft pile using the digital image correlation technique. Discrete element modelling was used to further examine the load-sharing characteristics, axial force, and shaft friction of the screw pile. The results suggest that the screw pile outperformed the shaft pile in terms of uplift capacity, pilesand interactions, and load transfer. The improved uplift performance is attributed to the screw threads reaching out to a larger volume of sand particles to resist the uplift. An equation was also proposed to determine the uplift capacity.

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干砂土中螺旋桩拔桩模型与数值分析

研究了螺旋桩在上拔作用下的受力性能。在实验室将螺旋桩安装在砂土中，并进行吊装，评价螺纹间距和砂土相对密度对桩抗拔能力的影响。利用数字图像相关技术，将其与竖井桩的抗拔能力进行了比较。采用离散元模型进一步分析了螺旋桩的荷载分担特性、轴向力和轴向摩擦力。结果表明，螺旋桩在抗拔能力、桩-砂相互作用和荷载传递等方面均优于轴桩。提升性能的提高是由于螺纹伸出到更大体积的砂粒上以抵抗提升。并提出了一个确定抬升能力的方程。

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

Canadian Geotechnical Journal 地学-地球科学综合

CiteScore

7.20

自引率

5.60%

发文量

163

审稿时长

7.5 months

期刊介绍： The Canadian Geotechnical Journal features articles, notes, reviews, and discussions related to new developments in geotechnical and geoenvironmental engineering, and applied sciences. The topics of papers written by researchers and engineers/scientists active in industry include soil and rock mechanics, material properties and fundamental behaviour, site characterization, foundations, excavations, tunnels, dams and embankments, slopes, landslides, geological and rock engineering, ground improvement, hydrogeology and contaminant hydrogeology, geochemistry, waste management, geosynthetics, offshore engineering, ice, frozen ground and northern engineering, risk and reliability applications, and physical and numerical modelling. Contributions that have practical relevance are preferred, including case records. Purely theoretical contributions are not generally published unless they are on a topic of special interest (like unsaturated soil mechanics or cold regions geotechnics) or they have direct practical value.