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桩承式路堤中填土破坏模式研究

DOI: 10.3969/j.issn.1674-0696.2011.02.18, PP. 258-262

Keywords: 桩承式路堤,土拱效应,有限元,破坏模式,pile-supportedembankment,soilarchingeffect,finiteelementmethod,failuremode

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Abstract:

:？为了研究桩承式路堤中填土的破坏模式,采用有限元方法对不同桩间距、填土高度和摩擦角进行了参数敏感性分析。根据计算得到的屈服区和增量等效塑性应变结果,分析了不同情况下填土的破坏机理。结果显示:对于填土高度与桩间距之比H/s??1的低路堤,填土中的破坏面为通过桩边缘的竖直面；对于H/s1.2的高路堤的情况,最终填土中将发展出类似经典地基承载力理论中的由弹性楔体、径向剪切区和被动破坏区组成的区域,并且由于相邻桩的影响,填土中破坏面的具体形式会有所改变。

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