咬合桩-旋喷锚索基坑支护体系分析

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Abstract Research purposes: With foundation pit support of Yantai Dashang city park project A1 plot as the engineering background, this paper introduced the secant pile-rotary spray anchor supporting structure in the project. An equivalent elastic modulus method was proposed based on the deflection for the secant pile. Using the finite element software ABAQUS, the deformation and mechanical behavior of secant pile and rotary cable was analyzed during the excavation of the foundation pit. The influence of different factors on anchor cable supporting effect and foundation pit stability was studied.
Research conclusions: (1) The retaining system of secant pile and rotary cable is safe and economical in the soft soil area. (2) By changing the length, angle and setting of prestress of shotcrete anchor cable, the supporting effect of foundation pit plays an important role. In a certain range, the stability of foundation pit increases with the increase of anchor cable length. When the angle of anchor cable is 15°, the stability of foundation pit is the highest. (3) The comparative analysis of simulation results and experiments shows that the proposed equivalent elastic modulus calculation based on deflection is feasible. The deflection equivalence model can be used for reference in the calculation of elastic modulus of secant pile.

Key words： numerical simulation secant pile rotary anchor cable deflection equivalent

Received: 31 May 2021

PACS:

O319.56

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	Articles by authors
	ZHANG Guangchao
	HOU Qiangsong
	JI Zhaoteng
	ZHANG Dashuai
	XIA Xicen
	LIU Guochong
	ZHAO Honghua

Cite this article:

ZHANG Guangchao,HOU Qiangsong,JI Zhaoteng, et al. Analysis of Retaining System of Secant Pile-rotary Anchor Cable for Foundation Pit Excavation[J]. Journal of Railway Engineering Society, 2022, 39(5): 14-19.

URL:

https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I5/14

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