Abstract:

Taking two tunnels with small clear spacing located on Liu'anQianshan expressway and Yong'anWuping expressway as examples, the author compares the tunneling method and rock pillar reinforcement measures of the two tunnels in different geology conditions, based on the practice of construction of tunnels with small clear spacing in China. In addition, the author recommends the reasonable construction methods for tunnels with small clear spacing in this paper, which can provide reference for similar projects in the future.

Key words: tunnel with , small clear spacing excavation method rock pillar