隧道通风竖井支护方案优化

Optimization of Tunnel Ventilation Shaft Support Scheme

本文结合关山隧道通风竖井,基于结构力学的“地层-结构”法,采用有限元软件,对全井单行作业法施工过程中的衬砌结构进行了分析,并对设计支护参数进行了优化,为类似工程提供了参考。研究结果表明:全井单行作业法施工过程中,初支结构的变形随着井深的增大而增大,在下循环开挖的时候上循环初支结构的变形量增大,最大变形位于井底;在静力状态下初支结构随着埋深的增大,整体变形增大,变形增幅在减小;竖井开挖后,对周围岩体有明显的影响。

In this paper,the lining structure of guanshan tunnel ventilation shaft is analyzed and the supporting parameters are optimized,which provides reference for similar projects.The results show that the deformation of the primary support structure increases with the increase of well depth in the process of single-row operation,and the deformation of the primary support structure of the upper cycle increases with the excavation of the lower cycle,and the maximum deformation is located at the bottom of the well.In static state,with the increase of buried depth,the overall deformation increases and the increase of deformation decreases.The excavation of the shaft has obvious influence on the surrounding rock mass.