| 摘要 |
PURPOSE: An expansion method for a tunnel using multi-stage connecting rock bolts is provided to stably expand the cross section of a tunnel by easily installing rock bolts into the inner wall of the tunnel. CONSTITUTION: An expansion method for a tunnel using multi-stage connecting rock bolts is as follows. A rahmen-shaped protector structure(300) is arranged inside an existing tunnel(100). An expanded tunnel(200) is formed by removing the inner wall of the existing tunnel. The insertion members of multistage connecting rock bolts are successively installed on the inner walls of the expanded tunnel and connected to each other to form tunnel supports on the inner wall of the expanded tunnel.
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