邻近既有隧道的新建隧道稳定性控制对策研究

摘要

从新建隧道与既有隧道之间的合理岩柱的留设、新建隧道的施工方法以及支护方式等方面，采用数值模拟的方法，分析邻近既有平风岭隧道的新建新平风岭隧道的稳定性控制问题，提出留设8m岩柱、采用单侧壁导坑施工方法、侧向45°超前小导管加固的一体化稳定性控制对策。%The issues of stability control of the newly-built Pingfengling Tunnel adjacent to the existing Pingfengling Tunnel were analyzed by means of numerical simulation, in terms of the rock pillar’s reserving between the two tunnels, the construction method for the newly-built one, the support forms and so on. As a result, an integrative control measure of tunnel stability has been proposed, such as reserving 8 m rock pillar, using single side drift method, and using advanced small ducts to laterally strengthen in 45°direction of tunnel axis.