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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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

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	Articles by authors
	ZHANG Shuming1
	2
	JIANG Guanlu1
	2
	LIAO Yilai1
	2
	DU Dengfeng1
	2
	HUANG Haowei1
	2
	LIU Yong3

Cite this article:

ZHANG Shuming1,2,JIANG Guanlu1, et al. Effect of the strengthening area and the slope rate on bearing and deforming behaviors of CFG pile-geogrid composite foundations[J]. , 2019, 38(1): 192-202.

URL:

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

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