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为了加强对桩承式路堤中土拱效应的理解,采用有限元方法对不同桩间距、填土高度和内摩擦角的情况进行了参数敏感性分析。计算结果表明,对于填土高度与桩净间距之比H/(s-a)≤1的低路堤,填土中的破坏面为通过桩边缘的竖直面;而对于H/(s-a)≥1.5的高路堤的情况,最终填土中将发展成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。基于有限元得到的破坏模式,建立了土拱效应的二维简化分析方法,并与有限元和文献收集得到的试验数据进行了比较。结果表明,由于采用了合适的破坏面假设,简化方法的计算结果可靠合理。
In order to strengthen the understanding of soil arching in pile-supported embankments, the parameter sensitivity analysis of different pile spacing, filling height and internal friction angle was carried out by using finite element method. The calculation results show that for low embankments with a ratio of fill height to net pile spacing of H / (sa) ≤ 1, the failure plane in the fill is the vertical plane passing through the edge of the pile; while for low embankments with H / (sa) ≥ 1.5 In the case of high embankments, the final fill will evolve into a zone consisting of elastic wedges, radial shear zones and passive failure zones in a similar theory of bearing capacity of classical foundations. Based on the failure mode obtained by finite element method, a two-dimensional simplified analysis method of soil arching effect is established and compared with the experimental data collected by the finite element and literature. The results show that the simplified method is reliable and reasonable due to the assumption of suitable failure surface.