Instability Mechanism of Surrounding Rock for Super-Large Cross Section at High-Speed Railway Tunnel Portal

Shuang Lan Wu; Shi Hao Yang; Xue Wen Zhang

doi:10.4028/www.scientific.net/AMM.353-356.1597

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 353-356Instability Mechanism of Surrounding Rock for...

Instability Mechanism of Surrounding Rock for Super-Large Cross Section at High-Speed Railway Tunnel Portal

Abstract:

Difficulties of tunnel construction mainly appear in the entrance and exit stage, some adverse geological problems may occur. In terms of the tunnel at the Changsha-Kunming section of the Shanghai-Kunming passenger line, firstly, adverse geological phenomena at tunnel exits was described. Secondly, major factors leading to disasters were listed, including geology, hydrology and construction procedure. Combined with in-situ conditions, Finite Element Method (FEM) was used to analyze the instability mechanism of surrounding rock after the upper arch gate was excavated by three-bench seven-step exaction method. At last, through comparison between computed result and measuring data, several basic conclusions was obtained. It can make much sense to similar engineering.

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Periodical:

Applied Mechanics and Materials (Volumes 353-356)

Pages:

1597-1603

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.353-356.1597

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Online since:

August 2013

Authors:

Shuang Lan Wu*, Shi Hao Yang, Xue Wen Zhang

Keywords:

Finite Element Model (FEM), Instability Mechanism, Monitoring Measurement, Tunnel Portal Section

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