导洞法;导坑法
Three-dimensional numerical analysis method was used to study the characteristics of deformation and stress of surrounding rock and supporting structure on the process of tunnel unkennel construction. The comparative analysis of three-steps-seven-footwork tunnelling method and small pilot tunnel method were performed. 3.
采用三维数值分析手段研究隧道出洞施工过程中的围岩与支护结构变形受力特点,分别对三台阶七步法和超前小导洞法两种出洞施工方案进行对比分析。
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