| 列车动荷载下桩网结构路基土拱效应试验研究 |
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| 引用本文： | 韩高孝,宫全美,周顺华.列车动荷载下桩网结构路基土拱效应试验研究[J].岩土力学,2014,35(6):1600-1606. |
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| 作者姓名： | 韩高孝 宫全美 周顺华 |
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| 作者单位： | 同济大学 道路与交通工程教育部重点实验室，上海 201804 |
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| 基金项目： | 铁道部重点课题（No. 2010G003-A） |
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| 摘 要： | 通过三维模型试验研究了列车动荷载作用下的土拱效应。试验结果表明,动荷载作用下土拱效应依然有效,随着填土的增高,土拱效应在增强,土工格栅的存在可以增强土拱效应的作用。但动荷载条件下动应力的分布与自重条件下的应力分布截然不同。动荷载作用下土拱效应会发生退化,表现为动荷载施加过程中先前由桩所承担的部分动应力会转移至桩间土;完成动荷载施加后,最初由桩承担的部分自重荷载也会转移至桩间土。填土高度和土工格栅对于动荷载作用下土拱的稳定性有很大的影响,但当高度达到一定值之后,填土高度的影响就可忽略,土工格栅的存在使得土拱效应的削弱程度减小了一半。
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| 关 键 词： | 桩网结构路基 动荷载 土拱效应 模型试验 |
| 收稿时间： | 2013-10-29 |
Experimental study of soil arching effect in geogrid reinforced pile supported embankment under train dynamic load |
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| HAN Gao-xiao,GONG Quan-mei,ZHOU Shun-hua.Experimental study of soil arching effect in geogrid reinforced pile supported embankment under train dynamic load[J].Rock and Soil Mechanics,2014,35(6):1600-1606. |
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| Authors: | HAN Gao-xiao GONG Quan-mei ZHOU Shun-hua |
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| Institution: | Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 201804, China |
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| Abstract: | Soil arching effect in geogrid reinforced pile supported embankment under train dynamic load is studied by 3D model tests. Based on the test results, it is found that the soil arching effect remains valid under dynamic loading and the soil arching effect will be enhanced when the fill height increases and the existing geogrid will also enhance the soil arching effect. However, the dynamic stress distribution in geogrid reinforced pile supported embankment under dynamic loading is entirely different from the stress distribution under dead weight. The soil arching will degenerate under dynamic loading, which manifests that a part of dynamic stress previously carried by piles will transfer to soil between piles during dynamic loading applied and the dead load initially carried by piles will also transfer to soil between piles after finishing dynamic load application. The fill height and geogrid have large influences on soil arching under dynamic load; but when the fill height reaches a certain height, the influence of fill height on soil arching will be negligible; the influence of dynamic load on soil arching is weakened by half by geogrid. |
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| Keywords: | geogrid reinforced pile supported embankment dynamic load soil arching effect model test |
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