Open Access

ARTICLE

Stability Analysis of Cross-channel Excavation for Existing Anchor Removal Project in Subway Construction

Li Bin^1,2,3, Fang Hongyuan^1,2,3,*, He Wei⁴, Sun Bin¹

1 College of Water Conservancy & Environmental Engineering, Zhengzhou University. Zhengzhou, 450001, China.
2 National local joint engineering laboratory of major infrastructure testing and rehabilitation technology, Zhengzhou, 450001, China.
3 Collaborative Innovation Center of Water Conservancy and Transportation Infrastructure Safety, Henan Province, Zhengzhou, 450001, China.
4 Zhengzhou metro co. LTD, Henan Province, Zhengzhou, 450001, China)
* The corresponding author: Hongyuan Fang, E-mail：18337192244@163.com

Computer Modeling in Engineering & Sciences 2017, 113(1), 57-69. https://doi.org/10.3970/cmes.2017.113.054

Abstract

The cutter head will be stuck when the shield machine pass through the area existing anchor left by foundation construction of surrounding high-rise building. Subsurface excavation method is an efficient way to remove the existed anchor. In this paper, a three-dimensional finite element model is developed to study stability of cross-channel excavation. The time-spatial effects of arch crown settlement, intrados uplift and side wall horizontal convergence are analyzed according to different excavation size, lining thickness and lining order. The results show that the excavation size is the main factor to control the deformation of the surrounding soil, especially in arch crown settlement; The influence of lining thickness on the spatial effect of surrounding soil deformation is obvious when the excavation size is large, but little on the time effect; The influence of the lining order on the deformation of the surrounding soil is obvious, in particular, the larger the excavation size, the more obvious advantages of the lining order. Finally, based on the time-spatial effects comparison of nine excavation schemes of the cross-channel, an optimum excavation scheme is adopted in the actual project.

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Keywords

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