考虑尺寸效应的桩侧摩阻力修正计算方法

doi:10.6040/j.issn.1672-3961.0.2021.161

摘要/Abstract

摘要：

为研究砂颗粒尺寸效应对桩侧摩阻力的影响, 开展理论分析和室内模型试验研究桩侧摩阻力随桩径、桩表面粗糙度和砂土中值粒径的变化规律, 建立考虑尺寸效应的桩侧摩阻力修正计算方法。考虑尺寸效应后, 通过拟合试验数据得到桩-土界面极限摩擦角与相对粗糙度的关系。为反映尺寸效应对桩侧法向应力增量的影响, 将桩-土界面剪切带视作弹性空心圆柱, 基于小孔扩张理论建立桩侧法向应力增量的改进计算方法, 并通过与模型试验结果对比验证该方法的可靠性。研究表明, 在一定范围内桩侧摩阻力主要受桩-土界面相对粗糙度和桩基与砂土中值粒径的比值两个参数影响, 其中界面相对粗糙度和桩基与砂土中值粒径比值分别通过影响桩-土界面极限摩擦角和法向应力增量进而影响桩侧摩阻力。研究结果可为微型桩等小直径桩基承载力设计提供相应的理论依据。

关键词: 微型桩, 桩侧摩阻力, 尺寸效应, 砂土, 小孔扩张理论

Abstract:

This study aimed to investigate the influence of particle size on the micropile by conducting theoretical analysis and model tests. The empirical relationship between the critical friction angle and the relative roughness at the pile-soil interface was established, and thus the critical friction angle could be determined quantitively in consideration of the particle size of sands. To emphasis the influence of particle size on the additional normal stress at the soil-pile interface, the shear band at the soil-pile interface was modelled as a hollow cylinder and then a new modified method was proposed based on the elastic cavity expansion theory. Only two new parameters, Poisson's ratio and the thickness of the shear band, were involved in the modified method, which was validated by comparison with model tests. It was found that the pile shaft friction was mainly determined by the pile roughness and the ratio of pile diameter to sand median size and the critical state angle at the pile-soil interface, while the additional normal stress mainly results from the pile roughness and the ratio of pile diameter to sand median size, respectively. The research could provide the valueable reference for the bearing capacity design of micropiles.

Key words: micropile, shaft friction, particle size effect, sand, cavity expansion theory

中图分类号:

TU473

庄培芝,张营超,宋修广,杨鹤,郭志成,胡岩. 考虑尺寸效应的桩侧摩阻力修正计算方法[J]. 山东大学学报 (工学版), 2021, 51(5): 8-15.

Peizhi ZHUANG,Yingchao ZHANG,Xiuguang SONG,He YANG,Zhicheng GUO,Yan HU. Modified calculation method of shaft friction for driven pile considering particle size effect[J]. Journal of Shandong University(Engineering Science), 2021, 51(5): 8-15.

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类型	中值粒径d₅₀/mm	密度G_s/(10³kg·m^-3)	最大孔隙比e_max	最小孔隙比e_min	极限摩擦角φ_cs/(°)
FC砂	0.51	2.65	0.805	0.550	32
FE砂	0.12	2.65	1.014	0.613	32

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