The latest precise inspection for safety and diagnosis has found the clogging of transverse drainage pipes in NATM tunnel, resulting in hydraulic pressure generated on the outside of lining concrete that poses a safety threat to the tunnel structure.
Accordingly, this paper aims to conduct a safety analysis on using NATM tunnel that currently suffers the clogging of transverse drainage pipes based on its numerical analysis.

Abstract
 1. 서 론
 2. 해석위치 현황 및 선정사유
 3. 해석모델링
 4. 해석결과 및 고찰
 4. 결 론
 참고문헌

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