摘要
针对长哨小间距隧道建造中存在山体偏压情况,选择有一定代表性的Ⅴ级围岩区段小间距隧道LK108+800断面,利用有限元数值模拟方法,对6种施工方案下的偏压隧道支护结构受力及围岩屈服破坏进行了细致地仿真模拟分析。结果表明,山体偏压作用下,先施工深埋一侧的隧道,可有效减少中隔墙围岩的偏向及侧移,明显降低围岩塑性区面积,并有益于支护结构的稳定性。
Considering the unsymmetrical pressure of ground during the construction process of Changshao small-spaced twin tunnels, a representative section at LK108＋800 in V class surrounding rock was chosen to be studied. Based on 6 options with different construction procedure, numerical simulation analyses were carried out by using FEM to study the mechanical behavior of tunnel supporting structures and of the surrounding rocks at the selected section. Results indicated, earlier excavation of the deeper-buffed tunnel can reduce the sway of surrounding rock between tunnels, can remarkably reduce plastic zones in surrounding rocks and can better maintain the stability of supporting structure.
出处
《现代隧道技术》
EI
北大核心
2008年第3期29-35,共7页
Modern Tunnelling Technology
关键词
小间距隧道
偏压作用
稳定性预测
数值模拟
Small-spaced tunnels
Unsymmetrical pressure
Prediction for stability
Numerical simulation
