有覆盖层边坡对大直径嵌岩桩承载性能的影响

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL
H. Xing, Hao Zhang, Liangliang Liu, Yong Luo
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引用次数: 1

摘要

桩基础是桥梁基础和高架桥的一种典型形式,大跨度或高桥墩的桥梁一般采用大直径嵌岩桩。为研究覆盖层较深的山体边坡对大直径嵌岩桩承载特性的影响,采用4个不同坡度(0°、15°、30°、45°)单桩离心模型试验,研究边坡对桩承载特性的影响。此外,还进行了3组不同坡度(0度、30度、45度)的桩组试验,探讨坡度对群桩承载特性的影响。单桩试验结果表明,覆盖层较深的边坡不仅随着边坡坡度的增加而加速桩的阻力,而且由于桩周围不对称压力的增加,使桩的弯矩下移。随着坡度从0°增加到45°,桩的阻力明显增大,桩的轴力减小到12%以上。桩的最大弯矩位置下移,幅度变大。同时,边坡作用使桩身阻力减小,在坡度为45°时,桩身前侧的最大值比桩身后侧的最大值小3.98%。桩端阻力荷载分担比由5.49%提高到12.02%。群桩试验结果表明,边坡的增大加剧了桩顶反力分布的不均匀性,使桩顶弯矩较大,沉降量不同,可能对桥梁结构造成安全问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of slope with overburden layer on the bearing behavior of large-diameter rock-socketed piles
Pile foundation is a typical form of bridge foundation and viaduct, and large-diameter rock-socketed piles are typically adopted in bridges with long span or high piers. To investigate the effect of a mountain slope with a deep overburden layer on the bearing characteristics of large-diameter rock-socketed piles, four centrifuge model tests of single piles on different slopes (0o, 15o, 30o and 45o) were carried out to investigate the effect of slope on the bearing characteristics of piles. In addition, three pile group tests with different slope (0o, 30o and 45o) were also performed to explore the effect of slope on the bearing characteristics of the pile group. The results of the single pile tests indicate that the slope with a deep overburden layer not only accelerates the drag force of the pile with the increasing slope, but also causes the bending moment to move down owing to the increase in the unsymmetrical pressure around the pile. As the slope increases from 0o to 45o, the drag force of the pile is significantly enlarged and the axial force of the pile reduces to beyond 12%. The position of the maximum bending moment of the pile shifts downward, while the magnitude becomes larger. Meanwhile, the slope results in the reduction in the shaft resistance of the pile, and the maximum value at the front side of the pile is 3.98% less than at its rear side at a 45o slope. The load-sharing ratio of the tip resistance of the pile is increased from 5.49% to 12.02%. The results of the pile group tests show that the increase in the slope enhances the uneven distribution of the pile top reaction and yields a larger bending moment and different settlements on the pile cap, which might cause safety issues to bridge structures.
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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