한국지반신소재학회논문집 (Journal of the Korean Geosynthetics Society)

  • 제21권4호
  • /
  • Pages.101-109
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  • 2022
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  • 2508-2876(pISSN)
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  • 2287-9528(eISSN)
한국지반신소재학회 (Korean Geosynthetics Society)
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CLSM으로 되메움된 지하 인프라 매설물의 근접 굴착에 따른 거동특성 분석

Analysis on Behavior Characteristics of Underground Facility Backfilled with Clsm According to Adjacent Excavation

  • 투고 : 2022.12.04
  • 심사 : 2022.12.21
  • 발행 : 2022.12.30
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초록

본 연구에서는 근접 굴착에 의한 지하 인프라 매설물의 변위 발생에 미치는 되메움 재료 종류의 영향을 검토하기 위하여 일련의 실내모형실험을 수행하였다. 모형실험에서는 기존 매설물 주변의 되메움 재료를 일반 토사(주문진 표준사)와 CLSM으로 적용하였으며, 실험결과를 바탕으로 굴착면과 되메움부의 이격거리에 따른 굴착 단계별 매설물의 변위를 분석하였다. 매설물 주변의 되메움 재료로 토사를 적용한 경우, 굴착으로 인한 배면의 토사가 붕괴한 후 안식각을 이루며 사면 안정화가 이루어 지는 과정이 굴착 단계마다 반복되었다. 그리고 토사의 붕괴선이 매설물 설치 위치를 지나게 되는 굴착 단계에서 매설물의 변위가 발생하기 시작하였다. 되메움 재료로 CLSM을 적용한 경우, 굴착면과의 이격 거리와 관계없이 되메움 심도까지 굴착이 진행되어도 모형지반의 수평 및 연직 변위는 거의 발생하지 않았다. 이러한 결과를 바탕으로 지하 매설물 설치 후의 되메움 재료를 선택함에 있어서 CLSM과 같은 비교적 강성이 큰 재료를 선택함으로써 근접 굴착으로 인해 발생되는 횡토압에 대한 저항과 원지반의 붕괴 억지 효과를 기대할 수 있을 것으로 판단된다.

This study describes the results of model experiment to analyze the effect of backfill material types on the behavior of underground facility. In the model experiment, backfill materials around the existing underground facility were applied with soil (Jumunjin standard sand) and CLSM. The displacement of underground facility was analyzed for each excavation stage considering the separation distance between the excavation surface and the backfill area based on the experimental results. When soil was applied as a backfill material, the soil on the back of the excavation surface collapsed by excavation and formed an angle of repose, and the process of slope stability was repeated at each excavation stage. In addition, the displacement of underground facility began to occur in the excavation stage that the failure line of soil passes the installation location of the underground facility. When CLSM was applied as a backfill material, there was almost no horizontal and vertical displacement of the ground regardless of the separation distance from the excavation surface even when excavation proceeded to the backfill depth. Therefore, this result showed that it can have a resistance effect against the lateral earth pressure generated and the collapse of the original ground by adjacent excavation, if a backfill material with high stiffness such as CLSM is applied.

키워드

과제정보

본 연구는 중소벤처기업부 중소기업기술정보진흥원의 중소기업 기술규제 해결형 기술개발사업(지하인프라 매설물의 안정성 확보를 위한 채움재료 개발, S3034566)의 지원으로 수행되었으며 이에 깊은 감사를 드립니다.

참고문헌

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