The crack propagation on lining is compared for 10 years with previous length of crack in PISD(Precise Inspection for Safety and Diagnosis) depending on the width from 0.2mm to 1mm. Analyzed crack on horseshoe single tunnel is increasing in proportion to square time and linear increment. In this proposal, the extent of crack propagation can be estimated during the elapsed time. The tendency of crack can also be used in evaluating the life cycle of tunnel.

• 추진호(한국시설안전공단 수자원안전실 차장, 박사과정) | Choo, Jin-Ho 교신저자
• 고민호(한국시설안전공단 지반안전본부 직원) | Go, Min-Ho
• 윤태국(한국시설안전공단 지반안전본부 실장) | Yoon, Tae-Gook