It is necessary to establish countermeasures to prevent spalling in the tunnel ceiling concrete lining from being linked to lack of lining thickness, leading to additional spalling. We analyzed the effect of thinning between the ceiling part and the lining thickness on the safety of the tunnel and confirmed the structural behavior of the lining based on the measured values after practically reinforcing the inside and filling the inside of the lining.

Abstract
 1. 서 론
 2. 현장조사 및 해석방법
 3. 보강 전, 후 해석결과 및 고찰
 4. 결 론
 참고문헌

• 박상희(한국시설안전공단) | Park, Sang-hee 교신저자
• 장기수(한국시설안전공단) | Jang ki-su
• 고정(한국시설안전공단) | Ko, Jung
• 유선상(한국시설안전공단) | Yoo, Seon-Sang