암반등급별 기존 터널의 확폭 영향에 대한 수치해석적 평가
Evaluation on the widening effects of existing tunnel according to rock mass rating by numerical analysis
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참고문헌
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초록
도심지 교통인프라 수요의 지속적인 증가에 따라 기존 터널 확폭 기술의 필요성이 증가하고 있다. 본 논문에서는 터널 확폭의 적용성을 파악하기 위한 수치해석을 수행하였다. 기존 터널에 확폭과 분기 연결의 시공을 가정하여 3D 확폭 모델을 구성하고 지반조건을 암반등급 1~5 등급으로 변화하여 해석하였다. 해석 결과 암반등급 3등급 이하에서는 추가 보강공법을 적용해야 하는 것으로 나타났다. 또한 연결터널 및 확폭구간 등 응력집중 지점에서는 암반등급에 관계없이 추가 보강이 필요한 것으로 나타났다.
Abstract
As demand for transportation infrastructure in urban areas continue to increase, the need for tunnel widening technology has been increased. In this paper, numerical analysis was performed to determine the applicability of tunnel widening. A 3D model was constructed assuming the construction of widening and turnout connections in the existing tunnel, and the ground conditions were analyzed by changing rock mass rating(RMR) 1 to 5. As a result, it was found that additional reinforcements must be applied in RMR 3 or lower. And additional reinforcement is required in stress-concentrated points such as connection and widening sections, in the all RMR conditions.
참고문헌 (8)
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