加固范围及边坡坡率对CFG桩–网复合地基受力变形特性影响分析

doi:10.13722/j.cnki.jrme.2018.0714

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摘要通过开展相似比为1∶80的室内离心模型试验，并结合数值模拟方法，探究不同加固范围与不同边坡坡率对CFG桩–网复合地基受力变形特性的影响。分析表明：填筑期竖向位移明显增大，放置期与运营期增长缓慢并趋于稳定；当加固范围缩小时，边坡坡率为1∶1.5工况下的竖向位移增长趋势大于边坡坡率为1∶1.75工况下的，表现出边坡越陡对加固范围敏感性越高的规律；水平变形方面在坡脚及坡脚外5 m位置处数值较大，当加固范围变化时坡脚处水平变形在土层交界面位置出现反弯点，且加固范围越小反弯程度越大；相同荷载作用下半加固复合地基桩顶应力大于全加固复合地基，桩间土应力则表现出相反的规律；边坡坡率相同时桩–土应力比随加固范围缩小表现出一定程度的增大。

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	张树明1
	2
	蒋关鲁1
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	廖祎来1
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	杜登峰1
	2
	黄昊威1
	2
	刘勇3

关键词 ：桩基工程, 离心模型试验, 数值仿真, 桩&ndash, 网复合地基, 受力变形特性

Abstract：In order to study the effect of the strengthening area and the slope rate on bearing and deforming behaviors of CFG pile composite foundations，centrifuge test with a similarity ratio of 1∶80 and numerical simulation were conducted. The results show that the vertical displacement has a significant increase during embankment fill period and a slow growth during the placement and operation periods. With decreasing the strengthening area，the increasing trend of the vertical displacement with a slope ratio of 1∶1.5 is greater than that of 1∶1.75，which indicates that a steeper slope results in more sensitivity of the strengthening area. The horizontal displacements at the toe of the slope and 5 meters away from the toe of the slope are greater than those at other places. When the strengthening area decrease，a anti-bend point of the horizontal displacement at the toe of the slope occurs at the soil interface，and the anti-bend rate increases with decreasing the strengthening area. Under the same load，the stress on the pile top in a half strengthening composite foundation is greater than that in a whole strengthening composite foundation，but the earth stress between piles shows a opposite pattern. The pile-soil stress ratio shows a increase trend with the decrease of the strengthening area with a same slope rate.

Key words： pile foundations centrifuge model test numerical simulation pile-geogrid composite foundations bearing and deforming behaviors

引用本文:

张树明1，2，蒋关鲁1，2，廖祎来1，2，杜登峰1，2，黄昊威1，2，刘勇3. 加固范围及边坡坡率对CFG桩–网复合地基受力变形特性影响分析[J]. 岩石力学与工程学报, 2019, 38(1): 192-202.
ZHANG Shuming1，2，JIANG Guanlu1，2，LIAO Yilai1，2，DU Dengfeng1，2，HUANG Haowei1，2，LIU Yong3. Effect of the strengthening area and the slope rate on bearing and deforming behaviors of CFG pile-geogrid composite foundations. , 2019, 38(1): 192-202.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0714 或 http://www.rockmech.org/CN/Y2019/V38/I1/192

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