余江来, 张少钦, 陈乐意, 艾建凌, 冷光, 罗克嵩, 黄明辉, 杨金尤. 等截面嵌岩桩抗拔承载性状试验与数值分析[J]. 南昌航空大学学报(自然科学版), 2018, 32(3): 19-25,62. DOI: 10.3969/j.issn.1001-4926.2018.03.004
引用本文: 余江来, 张少钦, 陈乐意, 艾建凌, 冷光, 罗克嵩, 黄明辉, 杨金尤. 等截面嵌岩桩抗拔承载性状试验与数值分析[J]. 南昌航空大学学报(自然科学版), 2018, 32(3): 19-25,62. DOI: 10.3969/j.issn.1001-4926.2018.03.004
YU Jiang-lai, ZHANG shao-qin, CHEN Le-yi, AI Jian-ling, LENG Guang, LUO Ke-song, HUANG Ming-hui, YANG Jin-you. Test and Numerical Analysis on Uplifting and Bearing Performance of Rock-socketed Piles with Equal Sections[J]. Journal of nanchang hangkong university(Natural science edition), 2018, 32(3): 19-25,62. DOI: 10.3969/j.issn.1001-4926.2018.03.004
Citation: YU Jiang-lai, ZHANG shao-qin, CHEN Le-yi, AI Jian-ling, LENG Guang, LUO Ke-song, HUANG Ming-hui, YANG Jin-you. Test and Numerical Analysis on Uplifting and Bearing Performance of Rock-socketed Piles with Equal Sections[J]. Journal of nanchang hangkong university(Natural science edition), 2018, 32(3): 19-25,62. DOI: 10.3969/j.issn.1001-4926.2018.03.004

等截面嵌岩桩抗拔承载性状试验与数值分析

Test and Numerical Analysis on Uplifting and Bearing Performance of Rock-socketed Piles with Equal Sections

  • 摘要: 依据某工程完全嵌入中风化岩层中的等截面嵌岩抗拔桩现场单桩静载试验,对试验数据进行分析。在试桩试验的基础上,基于该工程岩土物理力学参数,建立了合理的等截面嵌岩抗拔桩FLAC3D数值计算模型,得到了荷载-位移曲线、桩身轴力和桩侧摩阻力分布,分析了等截面嵌岩抗拔桩的极限承载力、荷载传递性状和桩侧摩阻力发挥特性。分析结果表明:数值计算得到的等截面嵌岩抗拔桩极限承载力比现场试桩的最大荷载大28.6%;随着桩顶上拔荷载的增加,嵌岩抗拔桩的侧摩阻力是自桩顶向桩端沿深度逐渐发挥的,荷载较小时桩端处的侧摩阻力的发挥尚不明显,极限桩顶荷载下,桩侧摩阻力近似呈L型分布。

     

    Abstract: In accordance with the dead load test of single rock-socketed uplift pile with equal sections completely socketed in the medium weathered rock on the site of some project, the teat data were analyzed. Based on the pile test and the physical mechanics parameters of the rock and soil in this project, the reasonable FLAC3D numerical calculation model of rock-socketed uplift piles with equal section was established. The load-displacement curve, axial force of the pile body and side friction resistance of the pile was obtained. The ultimate bearing capacity, load transfer performance and side friction resistance of rock-socketed uplift piles were also analyzed. The results show that the ultimate bearing capacity of rock-socketed uplift piles with equal sections obtained by numerical simulation can be 28.6% larger than the maximum load of the on-site test piles. As the uplift load of pile top increases, the lateral friction resistance of the rock-socketed uplift piles has its effect from the pile top to the pile tip. When the load is relatively small, the friction resistance of the pile tip fails to completely have its effect. With the ultimate uplift load, the side friction resistance of the pile shows approximate L-shaped distribution.

     

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