基底倾斜的管桩复合地基路堤破坏模式研究

发布时间：2018-02-27 08:00

本文关键词： 管桩复合地基离心模型试验失稳模式　出处：《岩土工程学报》2017年S1期 　论文类型：期刊论文

【摘要】：通过4组土工离心模型试验,研究了山区底面倾斜的软土层管桩复合地基路堤破坏模式。基于底面倾斜的天然软基路堤变形及失稳破坏特点,分析了桩端嵌入硬土层深度和桩顶格梁对于山区管桩复合地基路堤变形及失稳破坏模式的影响。试验结果表明,倾斜软土管桩复合地基上的路堤破坏模式主要有:(1)当桩端嵌入硬土层较深时,复合地基易发生下坡坡脚附近的桩体倾倒和桩间土绕流破坏;(2)桩端嵌入硬土层较浅时,复合地基易发生桩体向一侧的倾覆破坏,并伴随一定的桩间土绕流破坏,桩体倾覆程度显著大于桩端嵌入硬土层较深的情况;(3)当加格梁联系管桩桩顶时,复合地基易发生桩间土的绕流破坏。
[Abstract]:In this paper, the failure mode of soft soil pile composite foundation embankment with inclined bottom surface in mountainous area is studied through four groups of geotechnical centrifuge model tests. Based on the deformation and instability failure characteristics of natural soft foundation embankment with inclined bottom surface, the failure mode of soft soil pile composite foundation embankment with inclined bottom surface is studied. The influence of the depth of hard soil embedded at the end of the pile and the pile top lattice beam on the deformation and failure mode of the embankment of pipe pile composite foundation in mountainous area is analyzed. The experimental results show that, The main failure mode of embankment on the composite foundation of inclined soft soil pile is: 1) when the pile end is embedded in the hard soil, the pile toppling near the foot of the slope and the soil flow around the pile are prone to occur when the pile end is embedded in the hard soil. The composite foundation is prone to overturn failure of pile body to one side, and with the failure of soil flow between piles, the overturning degree of pile body is obviously larger than that of the pile end embedded in the hard soil layer. (3) when the pile top is connected with pipe pile with grid beam, the overturning degree of pile body is obviously greater than that of pile end embedded in hard soil layer. The failure of soil around pile is easy to happen in composite foundation.
【作者单位】：南京水利科学研究院;水文水资源与水利工程国家重点实验室;中铁建港航局集团勘察设计院有限公司;
【分类号】：U416.12

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