摘要
建立浅埋偏压黄土隧道计算模型,模拟围岩在不同施工阶段的变化情况,得到了围岩在不同施工阶段的应力场、位移场的分布规律。分析表明,浅埋偏压黄土隧道开挖时在山体较高一侧地表沉降累计最大,右侧拱顶、右侧拱腰、仰拱将产生向上的位移;施工过程拱顶部位土体出现拉应力区是易发生塌方的部位,施工中应及时施作初期支护。
Numerical simulation analysis was carried out for the construction behavior of the shallow uneven-pressured section of Mopanhan loess tunnel.Distribution regulations of surrounding rock stresses and deformations were obtained for different construction stages.Results showed that： the accumulative ground surface settlement was the largest on higher mountain side;upward displacements occurred on the right arch crown and right side wall,upheaval appeared for the invert arch;in construction process in arch crown area soil will appear tensile stresses,where collapse is apt to occur and primary support should be applied timely.
出处
《铁道标准设计》
北大核心
2011年第B12期125-128,共4页
Railway Standard Design
关键词
铁路隧道
黄土隧道
浅埋偏压
数值模拟
Railway tunnel
Loess tunnel
Shallow-buried and uneven-pressured
Numerical simulation
