| 扩建小净距公路隧道施工力学分析 |
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| 引用本文： | 疏义广,蒋树屏,雷明林. 扩建小净距公路隧道施工力学分析[J]. 重庆交通大学学报(自然科学版), 2012, 31(2): 214-217,251. DOI: 10.3969/j.issn.1674-0696.2012.02.11 |
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| 作者姓名： | 疏义广 蒋树屏 雷明林 |
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| 作者单位： | 1.重庆交通大学 土木建筑学院,重庆,400047;2.招商局重庆交通科研设计院有限公司,重庆,400067 |
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| 摘 要： | 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1/2 B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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| 关 键 词： | 扩建小净距隧道 施工力学 有限元 围岩应力 |
Construction Mechanical Analysis on Extension of Small Interval Tunnel |
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| Shu Yiguang , Jiang Shuping , Lei Minglin. Construction Mechanical Analysis on Extension of Small Interval Tunnel[J]. Journal of Chongqing Jiaotong University, 2012, 31(2): 214-217,251. DOI: 10.3969/j.issn.1674-0696.2012.02.11 |
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| Authors: | Shu Yiguang Jiang Shuping Lei Minglin |
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| Affiliation: | 1 (1.School of Civil Engineering & Architecture,Chongqing Jiaotong University,Chongqing 400074,China; 2.China Merchants Chongqing Communication Research & Design Institute Co.,Ltd.,Chongqing 400067,China) |
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| Abstract: | A FEM model is applied to simulate the mechanical characteristics of surrounding rock,middle rock pillar,anchor and preceding lining of a neighborhood tunnel with different clear distances.The results show that: the yield district of extension small interval tunnel is mainly concentrated at arch foot;the initial supporting-lining at the arch foot should be strengthened.When the clear distance is more than 0.5B,the mechanic state of middle rock pillar is slightly influenced by the clear distance;the bolt axial force of external tunnel is 4-5 times than that of the inner. |
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| Keywords: | extension of small interval tunnel construction mechanical FEM surrounding rock stress |
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