Abstract: To improve the understanding of the failure modes in the embankment fill, a parametrical study through finite element method was carried out.In the analysis, the pilespacing, the fill height and the friction angle of embankment fill were varied. Based on the yield zone and increment of equivalent plastic strain, failure mechanism in fill under different circumstances was analyzed; it was found that for low embankment with the ratio of fill height to the pile spacing H/s 1,the filure surface was vertical or slightly inclined which started from the pile edge and went through the whole fill height. For H /s 1.2, though the shape was upside down, the developed failure surface was like that assumed in the Terzagh is bearing capacity theory, .ie.at the ultimate state there was triangular elastic zone, radial shear zone and passive zone in the embankment fill. Due to the interference effect of adjacent piles, the failure surface was different indifferent cases

Key words: pile- supported embankment, soil arching effect, finite element method, failure mode

摘要： 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。

关键词: 桩承式路堤, 土拱效应, 有限元, 破坏模式