Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Performance Assessment of 3D Printed Mechanically Stabilized Earth Retaining Wall Backfilled with Recycling Soil

3D 프린팅 기술 기반 보강토 옹벽 순환토사 적용 뒤채움재의 성능 평가

  • Kim, Jae-Hwan (Dept. of Railroad Infrastructure Eng., Korea National University of Transportation) ;
  • Oh, Jeongho (Dept. of Railroad Infrastructure Eng., Korea National University of Transportation)
  • 김재환 (한국교통대학교 철도인프라공학과 ) ;
  • 오정호 (한국교통대학교 철도인프라공학과 )
  • Received : 2024.03.25
  • Accepted : 2024.04.04
  • Published : 2024.04.30
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Abstract

In Korea, numerous large-scale infrastructure construction projects and housing site developments are being undertaken. However, due to limited land availability, sourcing high-quality backfill materials that meet the standards for railroad and road embankment compaction and mechanically stabilized earth (MSE) retaining wall construction poses significant challenges. Concurrently, there has been an increase in structural failures of many MSE retaining walls, attributed primarily to reduced bearing capacity and impaired drainage performance, resulting from inadequate backfill compaction. This study aimed to analyze the structural performance and safety of an MSE retaining wall using recycled soil as backfill. We conducted small-scale model tests utilizing 3D printing technology combined with two-dimensional numerical analysis. The study quantitatively evaluated the MSE retaining wall's performance concerning the recycled soil mixing ratio and reinforcement installation methods. Furthermore, the utility of 3D printing was confirmed through the production of an experimental wall designed to facilitate easy reinforcement attachment, mirroring the conditions of actual MSE retaining wall construction.

최근 국내는 다양한 대규모 사회기반 시설물 공사 및 택지 개발 등이 시행되고 있으나, 이에 반해 제한적인 국토 여건으로 철도 또는 도로 흙쌓기 비탈면 다짐 시공 또는 보강토 옹벽 뒤채움재 시공 시 기준에 부합하는 양질의 토사 수급이 어려운 실정이다. 특히, 다수의 보강토 옹벽은 부적절한 뒤채움재 다짐 시공으로 인한 지지력과 배수 성능 저하로 인한 구조물 피해사례 등이 증가하고 있다. 이에 본 연구에서는 뒤채움재로 순환토사를 활용하는 보강토 옹벽에 대하여 3D 프린팅 기술 기반 실내 모형실험 및 2차원 수치해석을 수행하여 구조적 성능 및 안전성을 분석하고자 하였다. 그 결과, 순환토사 배합비 및 보강재 설치 방법에 따른 뒤채움재 성능을 확인하였으며, 3D 프린팅 기술을 통해 실제 보강토 옹벽 시공과 유사하게 보강재 체결이 쉬운 형태의 실험상 벽체를 제작하여 3D 프린터의 활용성을 확인하였다.

Keywords

Acknowledgement

본 연구는 2023년 한국교통대학교 교내 연구지원 사업 지원을 받아 수행되었으며, 이에 깊은 감사를 드립니다.

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