The purpose of this paper is to improve the method for rear cavity inspection of cut-off wall at concrete faced rock-fill dam. To do this, we suggested that using impact echo wave, analysis of embeded instruments data, and numerical method to considering the expecting crack open failure behavior. We hope that improved methods were assist maintenance of concrete cut-off wall at concrete faced rock-fill dam.

• 신창건(한국시설안전공단 진단본부, 차장, 토질및기초기술사, 공학박사) | Shin, Chang Gun
• 김영환(한국시설안전공단 진단본부, 팀장, 수자원개발기술사) | Kim, Yeong Hwan
• 채민이(한국시설안전공단 진단본부, 대리) | Chae, Min Lee
• 김경진(한국시설안전공단 진단본부, 사원) | Kim, Kyeong Jin
• 이홍열((주) 나노지오이엔씨, 차장) | Lee, Hong Yeol