直斜交替组合钢管桩支挡结构试验研究

doi:10.13722/j.cnki.jrme.2022.1043

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Abstract As a new retaining structure for excavations，alternating combination of vertical and incline steel pipe piles has many advantages，such as convenient construction，recyclable and low cost. The previous engineering practices have proved the good supporting performance，but there is a lack of systematic and in-depth understanding of its deformation and stress mechanism. In this study，cantilever pile and two alternating steel pipe piles with angles ? of 10° and 20°，respectively，were investigated using model experiment. The pile top displacement change law，pile body bending moment and deformation，and soil pressure distribution characteristics were analyzed in the process of foundation pit excavation. The test results show that with the same excavation depth of foundation pit，the top displacement of straight inclined alternating combination steel pipe pile decreases with the increasing angle ?，and the displacement of cantilever pile top is the largest. The bending moment diagram of cantilever pile shows the distribution characteristics of “fish belly”，while the alternating steel pipe is “S” type. The alternating combination of steel pipe has significant bending phenomenon，and the maximum bending moment of the pile body decreases with the increase of the angle ?. Under the action of soil pressure，the force of straight inclined alternating combination steel pipe pile is more reasonable. The inclined pile is pulled and the straight pile is pressed. The damage mode changes from the curved shear failure of cantilever pile to the pull failure of inclined pile and straight pile. In addition，the alternating combination of steel pipe pile supporting structure has three beneficial effects：anchor pulling effect，gravity effect and space structure effect. The pulling anchor effect and the gravity effect increase the anti-overturning moment of the structure，while the space structure effect improves the stiffness of the support structure. Therefore，the support structure has a good promotion and application value.

Key words： pile foundation alternating combination of vertical and incline steel pipe piles experimental study earth pressure deformation of pile

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	Articles by authors
	GAN Fei1
	2
	ZHENG Gang2
	CAO Teng1
	ZHOU Haizuo2
	JIANG Zhiheng1
	LI Meilin1
	BI Jing1
	LI Yalin3

Cite this article:

GAN Fei1,2,ZHENG Gang2, et al. Experimental study on retaining structure of alternating combination of vertical and incline steel pipe piles[J]. , 2023, 42(5): 1175-1187.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1043 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I5/1175

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