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基于内聚力模型的嵌岩双斜桩水平承载特性分析

叶青, 郭伟, 任宇晓, 庄道坤, 崔赛月

叶青, 郭伟, 任宇晓, 庄道坤, 崔赛月. 基于内聚力模型的嵌岩双斜桩水平承载特性分析[J]. 岩土工程学报, 2024, 46(S1): 233-238. DOI: 10.11779/CJGE2024S10041
引用本文: 叶青, 郭伟, 任宇晓, 庄道坤, 崔赛月. 基于内聚力模型的嵌岩双斜桩水平承载特性分析[J]. 岩土工程学报, 2024, 46(S1): 233-238. DOI: 10.11779/CJGE2024S10041
YE Qing, GUO Wei, REN Yuxiao, ZHUANG Daokun, CUI Saiyue. Horizontal bearing characteristics of double-inclined rock-socketed piles based on cohesion model[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(S1): 233-238. DOI: 10.11779/CJGE2024S10041
Citation: YE Qing, GUO Wei, REN Yuxiao, ZHUANG Daokun, CUI Saiyue. Horizontal bearing characteristics of double-inclined rock-socketed piles based on cohesion model[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(S1): 233-238. DOI: 10.11779/CJGE2024S10041

基于内聚力模型的嵌岩双斜桩水平承载特性分析  English Version

详细信息
    作者简介:

    叶青(1995—),男,博士研究生,主要从事岩土工程方向研究。E-mail: yeqing_1021@tju.edu.cn

  • 中图分类号: TU43

Horizontal bearing characteristics of double-inclined rock-socketed piles based on cohesion model

  • 摘要: 基于已有的对桩-岩界面剪切特性的研究,建立了界面几何参数和材料特性与内聚力模型参数间的转换关系,与现场试验和理论研究对比,验证了接触模型的准确性;结合室内嵌岩双斜桩模型试验,建立了对应有限元数值计算模型,对比分析了桩基荷载-位移曲线与弯矩规律,验证了模型的可靠性;进而建立不同倾角的足尺嵌岩双斜桩模型,分析在不同竖向定荷载下的水平承载特性。研究表明:嵌岩双斜桩系统是多因素协同作用的承载系统,对受多向组合荷载的嵌岩双斜桩而言,存在一最优竖向设计荷载,使得嵌岩双斜桩的水平承载力大大提高,但过大的竖向荷载和过小的倾角反而提高桩承台失稳的风险。
    Abstract: Based on the existing researches on the shear characteristics of the pile-rock interface, the conversion relationship between the interface geometric parameters and the material properties and the parameters of the cohesion model is established. The accuracy of the contact model is verified by comparing with the field tests and theoretical studies. Combined with the indoor model tests on double-inclined rock-socketed piles, the corresponding finite element numerical model is established. The load-displacement curve and bending moment law of pile foundation are compared and analyzed, and the reliability of the model is verified. Then the full-scale model for the double-inclined rock-socketed piles with different dip angles is established to analyze the horizontal bearing characteristics under different vertical fixed loads. The results show that the rock-socketed system is a bearing system with synergistic effects of multiple factors. There is an optimal vertical design load that makes the horizontal bearing capacity of the double-inclined rock-socketed piles be greatly improved for are subjected to multi-directional combined loads. However, too large vertical loads and too small dip angles will increase the risk of pile cap instability.
  • 图  1   桩-岩界面接触模型

    Figure  1.   Contact model for pile-rock interface

    图  2   桩-岩界面剪切行为的验证

    Figure  2.   Verification of shear behavior at pile-rock interface

    图  3   计算模型示意图

    Figure  3.   Schematic diagram of calculation model

    图  4   试验与模拟的水平偏移-荷载曲线

    Figure  4.   Horizontal offset-load curves of tests and simulations

    图  5   试验与模拟在G2、G4和G6工况下桩身弯矩对比

    Figure  5.   Comparison of bending moments of piles between test and simulation under G2, G4 and G6 working conditions

    图  6   双桩的水平极限承载力

    Figure  6.   Horizontal ultimate bearing capacities of double piles

    图  7   各工况下双斜桩弯矩分布图

    Figure  7.   Distribution of bending moment of double-inclined piles under different working conditions

    表  1   试验方案设计

    Table  1   Test scheme design

    序号 β/(°) 荷载工况 EI/(N·m) 桩长/m
    G1 0 H 1661.6 0.9
    G2 0.4Vult+H
    G3 5 H 1627.7 0.903
    G4 0.4Vult+H
    G5 15 H 1533.8 0.932
    G6 0.4Vult+H
    下载: 导出CSV

    表  2   模型材料的力学性质

    Table  2   Mechanical properties of materials in model

    材料 材料参数
    ρ/(kg·m-3) E/MPa μ φ/(°) c/kPa
    2700 38500 0.22
    桩帽 7800 200000 0.30
    1850 100 0.30 25.0 10
    岩石 2200 2000 0.22 42.5 400
    下载: 导出CSV

    表  3   岩土层力学参数[8]

    Table  3   Mechanical parameters of rock and soil layers

    地层 ρ/(g·cm-3) Es/MPa c/kPa φ/(°)
    粉质黏土 1.95 7.0 25 20
    白云质灰岩 2.30 280 60 40
    下载: 导出CSV
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  • 收稿日期:  2024-04-28
  • 刊出日期:  2024-07-31

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