| 摘要 |
Provided is a tunnel excavation method to safely excavate a tunnel while securing stability of a rock wall of an excavated tunnel surface without various types of support required for tunnel excavation by blasting. The tunnel excavation method comprises (a) a first tunneling step for boring an arch hole of closed curve shape continuously along a designed excavation line to create a small arch-shaped section between the foundation and excavation target ground, (b) a second tunneling step for additionally excavating the excavation target earth located inside of the small arch-shaped section using blasting or a vibrationless excavator to form a base tunnel, (c) a step for placing a lining along the excavated surface of the base tunnel formed by the second tunneling step to form a lining structure along the excavated surface, and (d) a step for injecting mortar in the gap between the lining structure and the excavated surface of the base tunnel to stabilize the rock wall. A designed tunnel is gradually excavated by repeating steps (a) to (d) according to the section in the tunnel excavation direction. |
