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扩建小净距公路隧道施工力学分析

DOI: 10.3969/j.issn.1674-0696.2012.02.11, PP. 214-217

Keywords: 扩建小净距隧道,施工力学,有限元,围岩应力,extensionofsmallintervaltunnel,constructionmechanical,FEM,surroundingrockstress

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Abstract:

:?利用有限元模型分析了扩建小净距隧道在不同净距下隧道围岩、中夹岩柱、锚杆及初衬的受力特征。研究结果表明:扩建小净距隧道围岩的屈服区主要集中在拱脚部位,拱脚部位的隧道支护结构应有所加强,当净距大于1/2B时,中夹岩柱受力状态受净距的影响很小|隧道外侧锚杆轴力约为内侧锚杆轴力的4~5倍。

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