Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Seismic Behaviour of Eco-BELT System and Seismic Effectiveness of T-shaped Deadman Considering Soil-Structure Interface Based on Dynamic Numerical Analysis

흙-구조물 접촉면을 고려한 친환경 옹벽 구조물의 지진시 거동 및 T형 후방지지물의 보강효과에 대한 동해석 분석연구

  • Kwak, Chang-Won (Dept. of Civil & Environmental Engrg., Inha Technical College) ;
  • Park, Inn-Joon (Dept. of Infrastructure & Systems, Hanseo Univ.)
  • 곽창원 (인하공업전문대학 토목환경과) ;
  • 박인준 (한서대학교 인프라시스템학과)
  • Received : 2021.07.22
  • Accepted : 2021.08.13
  • Published : 2021.08.31
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Abstract

A retaining wall system is widely constructed civil structure to maximize the effectiveness of practical use of the land. Recently, the technology which is more eco-friendly and owns seismic stability of the retaining wall system becomes important. In this study, an Eco-BELT system using natural rocks as the front wall is introduced and the seismic characteristics of the Eco-BELT system are analyzed based on 2 and 3 dimensional numerical analysis. The soil-structure interface comprises between backfill soil and natural rocks are considered. The relative density is mainly considered to influence the seismic behavior of Eco-BELT system, and T-shaped deadman is also considered to judge the increase of seismic stability. As a result, lateral displacement of the wall decreases 29.5% in maximum under 90% of relative density and decreases 21.2 to 21.9% with T-shaped deadman, therefore, the seismic effectiveness of T-shaped deadman and increasing relative density of backfill are verified by numerical analysis.

옹벽은 절, 성토부가 포함된 토지의 효율적 이용을 위하여 설치하는 대표적인 옹벽 구조물이다. 과거 국토개발 시기에는 시공성, 구조적 안정성 및 경제성에 치중하였다면, 최근에는 친환경적이고 내진 안정성을 갖춘 옹벽기술개발의 필요성이 증대되고 있는 실정이다. 본 연구에서는 자연석을 활용한 친환경적 옹벽 구조물(Eco-BELT)을 제시하고 지진 시 동적 거동특성을 2, 3차원 수치해석을 이용하여 분석하였다. 자연석과 배면 뒤채움 흙 사이에 형성되는 접촉면을 고려하여 수치해석에 적용하였으며 동적거동에 영향을 미치는 주요 변수로서 뒤채움재의 다짐도를 기준으로 다짐도 증가에 따른 동적거동을 분석하고 T형 후방지지물의 유무에 따른 내진성능 향상을 수치해석적으로 검토하였다. 그 결과 다짐도 증가 시 옹벽 수평변위가 최대 29.5% 감소하여 다짐도 증가에 따른 내진안정성 증대효과를 확인하고 T형 후방지지물 설치 시 최대 수평변위는 약 21.2~21.9%가 감소하는 것으로 산출되어 지진하중 재하 시 T형 후방지지물의 보강효과를 확인하였다.

Keywords

Acknowledgement

본 논문은 (주)에코밸리의 지원을 통해서 수행되었습니다. 연구지원에 감사드립니다.

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