超大面积深厚软土桩-网复合地基承载性状分析

吴九江; 程谦恭; 王寒冰; 文华

doi:10.13204/j.gyjz2011205020

超大面积深厚软土桩-网复合地基承载性状分析

doi: 10.13204/j.gyjz2011205020

1.
1. 西南交通大学地质工程系成都 610031;
2.
2. 西南科技大学土木工程与建筑学院四川绵阳 621010

基金项目:

国家自然科学基金项目(4117226051108393);国家重点基础研究发展计划(973计划)(2008CB425801);高等学校博士学科点专项科研基金(20110184110018)

详细信息

作者简介:
吴九江，男，1988年出生，博士研究生。

中图分类号: U416.1
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- 被引次数: 0
出版历程
- 收稿日期: 2011-10-28
- 刊出日期: 2012-05-20

NUMERICAL ANALYSIS OF GEOSYNTHETIC- REINFORCED AND PILE-SUPPORTED EARTH PLATFORM RESTING ON OVERSIZED DEEP SOFT SOIL

1.
1. School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031;
2.
2. School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China

摘要

摘要: 通过有限元Plaxis软件,对厦深高速铁路潮汕车站的超大面积深厚软土桩-网复合地基承载性状进行全断面数值模拟,系统地分析了其沉降变形、土压力变化、桩体受力、土工格栅拉力、超孔隙水压力变化等情况。结果表明:土层的沉降随填筑高度的变化具有一定的间歇性,沉降主要集中于加固区下面的下卧层中;土压力的发展变化呈现出明显的阶梯状,并贯穿于整个施工阶段。在竖向,管桩桩体轴力的峰值出现在淤泥质黏土层顶部,而没有出现在桩体顶部;在横向,沿路基中心向外,桩体剪力及弯矩依次逐渐增大。土工格栅的最大拉力出现在桩帽边缘处,桩间的拉力较小,在管桩顶部加设桩帽有助于均匀格栅中的拉力,避免局部应力集中;桩端土层以下超孔隙水压力随填筑加载而增长的幅度较大,桩端土层以上则较小,桩体有效地将上部荷载传递到深部较好土层,减轻了浅部软弱土层的负担,从而达到控制沉降的目的。
- 桩-网复合地基 /
- 深厚软土 /
- 沉降变形 /
- 承载机理
Abstract: By using the finite element software of Plaxis,the geosynthetic-reinforced and pile-supported earth platform resting on oversized deep soft soil in Chaoshan Railway Station of Xiamen-Shenzhen High Speed Railway was simulated.The settlement of subgrade,variation of earth pressure,and tensile force distribution of geogrid and so on were investigated.The results showed that the varying law of layers settlement with fill height appeared to be intermittent,and the settlement mainly occured in the underlying stratum; the earth pressure changed gradually and rectified its value throughout the entire construction period; the axial ultimate force of the piles occured on the top of the muddy clay layer in the vertical direction,and the moment and shear of pile body increased from the subgrade center outside in the horizontal direction; the maximum tension of geogrid occured at the edge of caps and the settings of caps contributed to balance the tension in geogrid to avoid stress concentration; the excess pore water pressure increased with increased fill height,which indicated that the upper loads could be effectively transferred from pile body to deep stratum,thus controlling foundation settlement well．
- geosynthetic-reinforced and pile-supported earth platform /
- deep soft soil /
- deformation by settlement /
- mechanism of load bearing

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参考文献(18)

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