盾构隧道下穿不同基桩数量群桩基础施工影响

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Abstract Research purposes: During the construction process of pile group foundations undercrossed by shield tunnel, what impact to pile group foundation with different area of foundation caps and different number of foundation piles is a concern problem to construction of metro tunnel. In order to explore the influence of shield tunnel underpass construction on pile foundations of different sizes of caps and different number of foundation piles, the low cap and friction pile group foundation was taken as the research object. The settlement and inclination law of cap were analyzed for different sizes of pile caps undercrossed by shield tunnel directly and laterally, as well as the horizontal displacement of the cap were analyzed when shield laterally passes under pile group foundation.
Research conclusions: (1) When shield tunnel pass under pile group foundation with the same horizontal spacing, the settlement of center position of the top of cap increases with the increase of area of cap and the number of foundation piles, and there is little difference in the impact of inclination of cap. (2) When shield tunnel laterally underpasses pile group foundation, the horizontal displacement of cap increases with the increase of area of cap and the number of foundation piles. (3) When the horizontal spacing is less than 2 times of tunnel diameter, especially shield tunnel directly passes under pile group foundation, the size of cap and the number of foundation piles has a greater impact on the settlement of pile group foundation, and the pile group effect is more obvious. (4) The research results can provide reference for design and construction of pile group foundation undercrossed by shield tunnel.

Key words： shield tunnel undercrossing construction pile group foundation size of cap number of foundation piles

Received: 05 May 2022

PACS:	U231.3
	U455.43

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	TANG Jinsong
	ZHANG Bao
	ZHAO Shuyin
	JIANG Jingshuang

Cite this article:

TANG Jinsong,ZHANG Bao,ZHAO Shuyin, et al. Construction Influence of Pile Group Foundation with Different Number of Foundation Piles Undercrossed by Shield Tunnel[J]. Journal of Railway Engineering Society, 2022, 39(11): 94-99.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I11/94

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