桩承式路堤中土拱效应可视化模型试验研究

doi:10.13722/j.cnki.jrme.2019.0856

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摘要桩承式路堤中土拱的形态还未得到统一认识，进一步开展土拱效应的研究对桩承式路堤中荷载传递规律分析有重要科学价值。首先简要介绍了桩承式路堤中土拱效应可视化的室内模型试验装置、试验材料以及测试元件的布置情况，然后采用该可视化试验装置进行变化路堤高度与桩间距的10组模型试验研究，以分析桩承式路堤中沉降的分布规律与竖向应力的分布特点。试验结果表明：变化路堤高度与桩间距的比值将显著影响桩承式路堤中土拱效应的发挥，在该平面土拱效应室内试验中，当h/(s－a)≤1.0时，路堤中没有应力重分布的现象，表明此时土拱效应没有产生；当1.0＜h/(s－a)＜1.5时，土拱效应未完全发挥；当h/(s－a)≥1.6 时，达到了完全成拱的条件，路堤填土的竖向应力分布存在两次拐点，与Hewlett & Randolph模型结果中的分布规律相似。模型试验结果还表明，路堤表面的差异沉降随着路堤高度的增加而逐渐减小，当路堤高度与桩净间距的比值大于1.6时，路堤表面的差异沉降基本为0。最后，根据土拱效应完全产生时的模型试验结果，推导了平面土拱的内拱与外拱高度的表达式，并基于土拱厚度不均匀的实际情况，采用试验结果对Hewlett & Randolph平面土拱理论进行修正，研究发现修正的Hewlett & Randolph方法能更好地与试验结果相吻合。

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	崔晓艳1
	庄妍1
	肖衡林2
	张军3
	张军辉4

关键词 ：土力学, 桩承式路堤, 土拱效应, 模型试验, 差异沉降, 竖向应力分布

Abstract：The shape of soil arch has not been generally recognized in the piled embankment，hence，further investigation on the soil arching effect has significant scientific research value for the analysis of load transfer mechanism in the piled embankment. The visualized model test device，materials used in the model test and the layout of the measured instruments to analyze the soil arching effect in piled embankment were firstly introduced. The distribution of the settlement and the vertical stress in the piled embankment were then investigated by carried out ten model tests based on this visualized device，in which the height of embankment and the pile spacing were varied. The experimental results showed that that the embankment height h and the clear pile spacing (s?a) are the key parameters for the generation of soil arching effect. For the plane strain condition，when h/(s?a)≤1.0，it can be concluded that the soil arching effect is not generated since the re-established vertical stress in the embankment was not occurred；for the ratio of h/(s?a) is in the range of 1.0–1.5，partial soil arching is formed；whereas when h/(s?a)≥1.6，the soil arching effect fully developed and the inflections of the vertical stress along the height of the embankment were founded，which is similar to the distribution of the vertical stress of embankment derived from the Hewlett & Randolph method. The experimental results also showed that the differential settlement at the surface of the embankment gradually decreased with increasing the embankment height，and approaching to zero for the value of h/(s?a) larger than 1.6. Finally，the equation of the inner and the outer height of soil arching were derived based on the experimental results，which were used to modify the analytical method proposed by Hewlett & Randolph. It can be found that the modified analytical method agreed well with the experimental results.

Key words： soil mechanics piled embankment soil arching effect model tests differential settlement distribution of the vertical stress

引用本文:

崔晓艳1，庄妍1，肖衡林2，张军3，张军辉4. 桩承式路堤中土拱效应可视化模型试验研究[J]. 岩石力学与工程学报, 2020, 39(S1): 3150-3158.
CUI Xiaoyan1，ZHUANG Yan1，XIAO Henglin2，ZHANG Jun3，ZHANG Junhui4. nvestigation on soil arching effect in visual model test of pile-supported embankment. , 2020, 39(S1): 3150-3158.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0856 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/IS1/3150

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