有轨电车桩板结构路基与道路路基横向差异沉降离心试验研究

doi:10.13722/j.cnki.jrme.2019.0787

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摘要一种新型桩板结构路基首次在上海松江有轨电车工程应用，沿市政道路铺设且与道路基础存在较大结构差异，运营期易产生差异沉降。为研究有轨电车桩板结构路基与道路路基横向差异沉降规律，将有轨电车轨道与道路作为整体研究对象，通过离心模型试验分析路基土应力历史、轨道与道路位置关系以及荷载分布形式对路基横向差异沉降影响规律。试验结果表明：土体应力历史对差异沉降有显著影响；有轨电车桩板结构路基与道路路基沉降均在运营初期发展迅速，运营6个月后沉降速率放缓；地基土的沉降随深度的增加而逐渐减小，桩端下卧层的压缩厚度约为4 m；单侧汽车荷载对有轨电车桩板结构偏载作用明显，有轨电车轨道与道路过渡区最大差异沉降率达4.37‰，有轨电车系统横向最大差异沉降率达2.42‰，需要进行必要的过渡处理。

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	陕耀1
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	陆义3
	周顺华1
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	王炳龙1
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关键词 ：土力学, 有轨电车轨道, 桩板结构, 离心试验, 横向差异沉降, 过渡段

Abstract：A new pile-plank subgrade configuration was employed for the modern tram track project in Shanghai. Since the tram track is embedded in road pavements and the subgrade configuration is quite different from that of the existing urban roads，the long-term lateral differential settlement between the tram infrastructure and the road infrastructure is an inherent issue. To investigate the lateral differential settlement distribution between the tram infrastructure and the road infrastructure，which are considered as a comprehensive research object in this study，some centrifugal model tests in different cases were undertaken，and the influence of soil stress history，track location and load distribution on the subgrade lateral differential settlement was investigated. Test results show that the soil stress history plays a significant role in effecting differential settlement distributions. The settlement of the tram foundation develops most rapidly in the initial 6 months of the operation，and then，the settlement rate decreases gradually with the operation time. The settlement of foundation soil decreases with the depth and the settlement influence depth beneath the pile bottom is about 4 m. Basically，the most serious case of the lateral settlement appears when the tram track locates by the side of the urban road. The maximum lateral differential settlement rate in the transition zone between tram and road infrastructures is up to 4.37‰，and the value of the tram system is up to 2.42‰. Consequently，some transition zone reinforcements are required.

Key words： soil mechanics tram track pile-plank subgrade centrifuge model tests lateral differential settlement transition zone

引用本文:

陕耀1，2，陆义3，周顺华1，2，王炳龙1，2. 有轨电车桩板结构路基与道路路基横向差异沉降离心试验研究[J]. 岩石力学与工程学报, 2020, 39(5): 1049-1060.
SHAN Yao1，2，LU Yi3，ZHOU Shunhua1，2，WANG Binglong1，2. Centrifugal model test study on lateral differential settlement between the tram pile-plank subgrade and the road subgrade#br#. , 2020, 39(5): 1049-1060.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0787 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I5/1049

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