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。
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.
出处
《重庆交通大学学报（自然科学版）》
CAS
北大核心
2012年第2期214-217,251,共5页
Journal of Chongqing Jiaotong University(Natural Science)
关键词
扩建小净距隧道
施工力学
有限元
围岩应力
extension of small interval tunnel
construction mechanical
FEM
surrounding rock stress
