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超大面积深厚软土桩-网复合地基承载性状分析

ISSN号：1000-8993
期刊名称：工业建筑
时间：2012
页码：106-114
分类：TU473.13[建筑科学—结构工程;建筑科学—土工工程]
作者机构：[1]西南交通大学地质工程系,成都610031, [2]西南科技大学土木工程与建筑学院,四川绵阳621010
相关基金：国家自然科学基金项目（41172260;51108393）;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）.
相关项目：高速铁路软基中格栅式地下连续墙桥梁基础沉降特性研究

关键词：桩-网复合地基, 深厚软土, 沉降变形, 承载机理, geosynthetic-reinforced and pile-supported earth platform, deep soft soil, deformation by settlement, mechanism of load bearing

中文摘要：

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。

英文摘要：

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 oecured 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.

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