Application of the pilot-tunnel-first method improves tunnel stability and reduces construction time by nearly 2 months in challenging soft rock environments.
Key Points
Construction period shortened by 1.96 months using the pilot-tunnel-first method, ensuring timely project completion.
Successful application of elongated bolts and strengthened steel arches enhances support and stability in soft rock conditions.
Observational analysis confirmed comparable stability to the double-side drift method while accelerating construction progress significantly.
Highlights the importance of innovative tunneling strategies for infrastructure projects in complex geological settings.