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螺旋槽桩的承载特性：模型试验与数值分析

Bearing Characteristics of Screw-Groove Piles: Model Test and Numerical Analysis.

作者信息

Zhao Huiling, Deng Yousheng, Zhuang Ziying, Yao Zhigang

机构信息

School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China.

Pile-Supported Structures Research & Test Center, Xi'an University of Science and Technology, Xi'an 710054, China.

出版信息

Materials (Basel). 2024 Nov 26;17(23):5791. doi: 10.3390/ma17235791.

DOI:10.3390/ma17235791
PMID:39685226
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11641902/
Abstract

Screw-groove piles, a new type of precast pile, are economically and environmentally friendly and improve the load-bearing performance of piles through a unique screw-groove structure. To reveal the load-transfer characteristics and bearing mechanism of the screw-groove pile, the axial force, load-settlement curve, skin friction, bearing capacity, and response characteristics of the foundation for piles under vertical loading were analyzed. Furthermore, a parameter analysis of the ultimate bearing capacity and material utilization of screw-groove piles was performed using the finite element method. The results demonstrate that the screw-groove pile had an ultimate bearing capacity 1.85 times higher than that of the circular pile, and its material utilization rate was 2.85 times higher. The screw-groove surface end resistance and pile-tip resistance formed a multipoint vertical bearing mode. It efficiently utilized the soil's shear strength and mobilized a larger volume of surrounding soil to share the load. The screw-groove structure increased the pile-soil interaction surface, thereby increasing the skin friction resistance of the pile. Additionally, increasing the inner radius of the screw groove boosts the pile's bearing capacity but may reduce material utilization. An optimal screw-groove spacing balances both factors, while excessive groove thickness lowers material use. The pile shows high sensitivity to soil parameters.

摘要

螺旋槽桩是一种新型预制桩，具有经济环保的特点，并通过独特的螺旋槽结构提高桩的承载性能。为揭示螺旋槽桩的荷载传递特性和承载机理，分析了竖向荷载作用下桩的轴向力、荷载-沉降曲线、侧摩阻力、承载力及基础响应特性。此外，采用有限元方法对螺旋槽桩的极限承载力和材料利用率进行了参数分析。结果表明，螺旋槽桩的极限承载力比圆形桩高1.85倍，材料利用率比圆形桩高2.85倍。螺旋槽表面端阻力和桩端阻力形成多点竖向承载模式，有效利用了土体抗剪强度，调动了更大范围的周边土体共同分担荷载。螺旋槽结构增加了桩土相互作用面积，从而增大了桩的侧摩阻力。此外，增大螺旋槽内半径可提高桩的承载力，但可能降低材料利用率。最佳螺旋槽间距可兼顾两者，而槽厚过大则会降低材料利用率。该桩对土参数具有较高的敏感性。

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