Numerical Optimization Analysis of the Construction Sequence of PBA Group Hole

Abstract:

Based on the PBA construction method of Changchun Liberation Road station metro line No.2, in order to get the optimization of construction sequence of six pilot tunnels, we use numerical simulation method and finite element software MIDAS GTS to establish the construction model of the station pilot tunnel. After comparing four excavation methods of the surface subsidence, we come to a conclusion that first up then down and first side then middle is the optimal excavation scheme. At the same time, we make models to analysis the necessity of making advance support before pilot tunnel construction. Pipe shed and small duct grouting pre support is very significant to the control of the subsidence of ground surface and vault.

• Periodical: Applied Mechanics and Materials (Volumes 501-504)
• Pages: 2199-2204
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.501-504.2199
• Online since: January 2014
• Authors: Heng Qian Hu
• Keywords: Advanced Support, Construction Sequence, MIDAS GTS, Pilot Tunnel, Subway Station

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