深厚软土区有轨电车桩板结构路基沉降变形离心模型试验

doi:10.13722/j.cnki.jrme.2021.1172

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摘要有轨电车桩板结构路基是近年来提出的一种新型路基结构形式，该路基中桩采用摩擦桩且疏桩化布置，以达到桩和桩间土共同承担上部荷载的目的。采用土工离心模型试验对有轨电车桩板结构路基沉降和土体位移场变化规律进行研究。结果表明：有轨电车桩板结构路基沉降满足规范要求，上部荷载由桩和桩间土共同承担，板下未出现脱空现象；桩长和桩间距对路基沉降有显著影响，有轨电车桩板结构路基沉降随桩间距增大呈增大趋势，而路基沉降随桩长增加而呈减小趋势；在运营初期，路基沉降量递增幅度较大，在运营后期，路基沉降量递增幅度较小；桩侧土体沉降沿深度逐渐降低，在桩端附近出现拐点；桩土相对位移未出现负值，且沿深度逐渐增大，最大值位于桩端处；桩端土体与板下土体的沉降变形相同，桩侧土体与跨中土体存在差异沉降，深度越大，差值越明显。

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	王长丹1
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	陈凯祥1
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	陕耀1
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	周顺华1
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	王炳龙1
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	李良1
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关键词 ：地基基础, 桩板结构路基, 离心模型试验, 疏桩, 桩侧土, 相对位移

Abstract：The tram pile plate structure，a new embankment structure，is proposed in recent years. In order to achieve the purpose of bearing the upper load by the piles and soil between the piles，friction piles with sparse arrangement are used in the embankment. The embankment settlement and soil displacement field of the tram pile plate structure are studied by centrifugal model test. The results show that the tram embankment settlement meets the requirements of the code. The upper load is shared by piles and soil between piles，and there is no void under the plate. Pile length and pile spacing have a significant effect on embankment settlement. The embankment settlement increases with the increase of pile spacing，while it decreases with the increase of pile length. The embankment settlement increases gradually at the initial stage of operation. In the later stage of operation，the increasing degree of embankment settlement is small，and the embankment settlement tends to be stable. The settlement of the soil around pile decreases gradually along the depth，and there is an inflection point near the pile end. The relative displacement of pile-soil does not have a negative value and gradually increases with the depth. The settlements of the soil on pile tip and under plate are the same. There is differential settlement between the soil around the pile and in the middle of the span. The greater the depth，the more obvious the difference.

Key words： foundations pile plate structure embankment centrifugal model test sparse pile pile side soil relative displacement

引用本文:

王长丹1，2，陈凯祥1，2，陕耀1，2，周顺华1，2，王炳龙1，2，李良1，2. 深厚软土区有轨电车桩板结构路基沉降变形离心模型试验[J]. 岩石力学与工程学报, 2022, 41(S2): 3444-3452.
WANG Changdan1，2，CHEN Kaixiang1，2，SHAN Yao1，2，ZHOU Shunhua1，2，WANG Binglong1，2，LI Liang1，2. Centrifugal test on settlement of tram pile plate structure embankment in deep soft area. , 2022, 41(S2): 3444-3452.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.1172 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS2/3444

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