浅埋偏压小净距隧道开挖顺序研究

摘要

采用改进的有限元强度折减法计算某浅埋偏压小净距隧道2种开挖方式在各个施工阶段的安全系数大小.比较这些安全系数,找到2种开挖方式在整个开挖过程中最容易产生破坏的施工步,得出浅埋偏压小净距隧道先开挖深埋侧可避免出现较危险的施工状态这一结论,希望对研究对类似工程的施工具有一定的指导意义.%The modified FEM Strength Reduction Method is adopted to calculate the safety factors of two excavation modes during various construction phases in some shallow-depth unsymmetrical loading small spacing tunnel. By comparing these safety factors, this paper finds out the construction steps that are easiest to be damaged by the above two excavation modes during excavation, and draws a conclusion that excavating deep-buried side first of the shallow-depth unsymmetrical loading small spacing tunnel can avoid occurrence of dangerous construction states in hope of providing a certain guidance for research on construction of similar projects.