이세희
(Graduate School of Railway, Seoul National University of Science & Technology)
,
김미나
(Graduate School of Railway, Seoul National University of Science & Technology)
,
조국환
(Dept of Railway Construction Engineering, Graduate School of Railway, Seoul National University of Science & Technology)
우리나라 지형특성상 교량 및 터널부가 많은 부분을 차지하여 접속부 시공의 중요도가 증대되었다. 본 연구에서는 단면에 비해 경제성이 우수하고 보강효과가 좋은 토목섬유의 접속부 보강방식과, 토목섬유튜브를 보강토 블록처럼 쌓아 올려 뒷채움재를 접속부 교대와 분리시키는 시공을 진행하였다. 대상 현장에서 접속부 교대에 작용하는 수평토압을 측정하고 측정토압 분포와 유사한 토압론 및 지반정수케이스를 도출하였다. 실측토압은 기존 Rankine의 이론식 수평토압과 상당한 차이를 보였으며 깊이에 따라 토압이 비선형적으로 감소하는 사일로 토압과 유사하게 나타났다. 따라서 사일로 토압 내 지반정수를 변화시켜 실측토압분포와 가장 유사한 케이스를 도출하였으며, 도출된 결과를 활용하여 접속부 교대와 분리시킨 뒷채움재 사이의 간격에 따라 분리형 접속부에 작용하는 수평토압 분포를 제시하였다.
우리나라 지형특성상 교량 및 터널부가 많은 부분을 차지하여 접속부 시공의 중요도가 증대되었다. 본 연구에서는 단면에 비해 경제성이 우수하고 보강효과가 좋은 토목섬유의 접속부 보강방식과, 토목섬유튜브를 보강토 블록처럼 쌓아 올려 뒷채움재를 접속부 교대와 분리시키는 시공을 진행하였다. 대상 현장에서 접속부 교대에 작용하는 수평토압을 측정하고 측정토압 분포와 유사한 토압론 및 지반정수케이스를 도출하였다. 실측토압은 기존 Rankine의 이론식 수평토압과 상당한 차이를 보였으며 깊이에 따라 토압이 비선형적으로 감소하는 사일로 토압과 유사하게 나타났다. 따라서 사일로 토압 내 지반정수를 변화시켜 실측토압분포와 가장 유사한 케이스를 도출하였으며, 도출된 결과를 활용하여 접속부 교대와 분리시킨 뒷채움재 사이의 간격에 따라 분리형 접속부에 작용하는 수평토압 분포를 제시하였다.
As bridge and tunnel construction comprise a large proportion of railway construction, the importance of transition zones has increased. In this study, a reinforced segmental retaining wall was constructed to separate abutment and backfill. This was done by stacking up geosynthetic tubes. At the obj...
As bridge and tunnel construction comprise a large proportion of railway construction, the importance of transition zones has increased. In this study, a reinforced segmental retaining wall was constructed to separate abutment and backfill. This was done by stacking up geosynthetic tubes. At the object field, the earth pressure acting on abutment was measured. Accordingly, the distributions of earth pressure and geotechnical properties were derived from the measured earth pressure. The measured earth pressure and Rankine earth pressure showed a lot of differences, whereas the measured earth pressure and silo earth pressure appeared similar because the lateral earth pressure decreases non-linearly with depth. Therefore, the most similar to the measured lateral earth pressure distribution was derived by changing the geotechnical properties to estimate the silo earth pressure. Using the derived results, the lateral earth pressure acting on a separated abutment is suggested, depending on the space between abutment and backfill.
As bridge and tunnel construction comprise a large proportion of railway construction, the importance of transition zones has increased. In this study, a reinforced segmental retaining wall was constructed to separate abutment and backfill. This was done by stacking up geosynthetic tubes. At the object field, the earth pressure acting on abutment was measured. Accordingly, the distributions of earth pressure and geotechnical properties were derived from the measured earth pressure. The measured earth pressure and Rankine earth pressure showed a lot of differences, whereas the measured earth pressure and silo earth pressure appeared similar because the lateral earth pressure decreases non-linearly with depth. Therefore, the most similar to the measured lateral earth pressure distribution was derived by changing the geotechnical properties to estimate the silo earth pressure. Using the derived results, the lateral earth pressure acting on a separated abutment is suggested, depending on the space between abutment and backfill.
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