桩承式路堤中平面土拱效应室内模型试验研究
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国家自然科学基金资助项目(51478166);中央高校基本科研业务费专项资金资助项目(2016B04414,2016B20614,2015B17814,2015B25914);“111”计划项目(B13024);河海大学大学生创新创业训练项目(201610294029);“青蓝工程”资助


Laboratory test of two dimensional arching effect in piled embankment
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    摘要:

    介绍了平面土拱效应室内模型试验的试验装置与试验方法,对比分析了桩承式路堤中填土的竖向应力分布与Terzaghi理论方法以及Hewlett & Randolph理论方法中的分布规律,并对Hewlett & Randolph理论方法进行了修正。研究结果表明:路堤高度h 与桩间距s 比值对土拱效应产生具有重要影响,当h/s <0.67时,没有土拱效应;当0.67< h/s <1.33时,土拱效应部分产生;当h/s≥1.33时,土拱效应完全产生,且此时路堤填土的竖向应力分布与Hewlett & Randolph方法的分布规律相同;与Hewlett & Randolph方法相比,修正的Hewlett & Randolph方法与模型试验结果更接近。试验同时分析了路堤高度的变化对桩土应力比的影响,试验结果表明:随着路堤高度的增加,桩土应力比逐渐增大,但是增大的速率随着路堤高度的增加而减小。

    Abstract:

    This paper described the equipment and test methods of the two dimensional soil arching laboratory tests. The distribution of vertical stress in the embankment was reported, and compared with the results of Terzaghi and Hewlett & Randolph methods. The modification of the Hewlett & Randolph method was also discussed. It was found that the ratio of embankment height h and pile spacing s play an important role in the formation of soil arching. The laboratory test results show that there is no soil arching for h/s <0.67, partial soil arching generated for 0.67< h/s <1.33 and fully soil arching generated for h/s ≥1.33. The distribution of vertical stress in the embankment captures the same tend of the results of Hewlett & Randolph method for h/s ≥1.33. The difference between the results of modified Hewlett & Randolph method and experimental results is smaller than that of Hewlett & Randolph method. The effect of embankment height on the stress ratio between piles and subsoil n were also investigated, it was found that the value of n increases with increasing the embankment height, whereas the growth rate reduced with the increase of embankment height.

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庄妍,崔晓艳,刘奂孜,梁栋,李嘉俊,吴敏,陶志威,苗雨.桩承式路堤中平面土拱效应室内模型试验研究[J].河北工程大学自然版,2017,34(2):1-6

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  • 收稿日期:2017-02-21
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  • 在线发布日期: 2017-06-21
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