Design of Mining of Super-shallow-covered Large-span Tunnel under Suspended Protection Arch and Analysis on its Effect

Tunnel Construction ›› 2011, Vol. 31 ›› Issue (4): 489-493.

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Design of Mining of Super-shallow-covered Large-span Tunnel under Suspended Protection Arch and Analysis on its Effect

LV Yonggang¹, QIN Huihui²

1. CCCC Highway Consultant Co., Ltd, Beijing 100088, China; 2. Engineering Research Center of Tunnel and Underground Engineering, Ministry of Education，Beijing Jiaotong University， Beijing 100044, China

Received:2011-05-04 Revised:2011-06-10 Online:2011-08-20 Published:2011-11-02

Abstract

Abstract:

Suspended protection arch method has been successfully applied in the mining construction of the supershallowcovered section of Dajuekeng No. 1 tunnel. The dynamic construction process is simulated by means of 3D numerical method, the effect of the suspended protection arch is analyzed and the working mechanisms of the suspended protection arch method is summarized. The results show that the suspended protection arch method, which can play an effective role in the control of the deformation of surrounding rocks and the development of the plasticized zone, as well as in the improving of the stress conditions of the support structure, is a safe, rapid and effective mining method for supershallowcovered largespan tunnels.

Key words: suspended protection arch method, large-span tunnel, super-shallow cover, mining method, numerical simulation

LV Yong-Gang, QIN Hui-Hui. Design of Mining of Super-shallow-covered Large-span Tunnel under Suspended Protection Arch and Analysis on its Effect[J]. Tunnel Construction, 2011, 31(4): 489-493.

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Design of Mining of Super-shallow-covered Large-span Tunnel under Suspended Protection Arch and Analysis on its Effect

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