不同工法下层状软岩小净距隧道围岩稳定性研究

摘要

以湖北某高速公路修建的层状软岩小净距隧道为工程背景，利用FLAC3D软件对层状软岩小净距隧道围岩稳定性进行了数值分析，主要考虑Ⅳ级围岩、中岩墙厚度一定时，不同开挖方法对围岩稳定性的影响，并探讨了层状软岩小净距隧道开挖稳定机制，分析了倾斜状层状软岩小净距隧道开挖后应力场分布特征，研究结果可为类似工程施工提供参考。%Taking the interbedded soft rock small-interval tunnel engineering of the highway in Hubei as the engineering background,the paper carries out numerical analysis of interbedded soft rock small-interval tunnel surrounding rock stability by applying FLAC3D software,considers the impact of various excavation methods upon surrounding rock stability with certain Ⅳ-level surrounding rock and middle-rock wall thickness,and explores the excavation stability mechanism of interbedded soft rock small-interval tunnel,and finally analyzes excavated stress field distribution features of inclined interbedded soft rock small-interval tunnel,which has provided some guidance for similar engineering construction.