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A Case Study on Collapsed Geosynthetic Reinforced Segmental Retaining Wall

블록식 보강토옹벽의 붕괴사례 연구

  • Received : 2013.01.16
  • Accepted : 2013.04.11
  • Published : 2013.04.30

Abstract

This case study deal with the investigation of various causes and analyses concerning the cases of the collapse of reinforced segmental retaining walls installed for newly constructing a peripheral road within the campus of ${\bigcirc}{\bigcirc}$ University located in Gyeonggi-do. As results of stability analyses and reviewing of design documents concerning collapsed reinforced segmental retaining walls, such a collapse appeared because of problems related to construction including poor-compacted backfill, the omission of the investigation on the bearing capacity, the length and space in the installation of reinforced materials, and drainage systems. Also, problems during diverse types of designing were confirmed involving the stability analysis of the entire slope stability to be considered during designing and failure in application of the proposed methods of FHWA or NCMA which are generally used for two-tier reinforced segmental retaining walls. In addition, based on these details of the stability assessment, the study proposed reinforcement solutions and construction methods for stabilizing reinforced segmental retaining walls to be reconstructed in the future.

이 연구에서는 경기도에 위치한 ${\bigcirc}{\bigcirc}$대학교 캠퍼스 내 외곽도로 신설을 위해서 설치된 보강토옹벽의 붕괴사례를 통해 다양한 원인조사 및 분석에 대한 내용을 다루었다. 붕괴된 보강토옹벽에 대한 안정성 평가 및 설계도서 검토결과 다짐불량, 기초지반의 지지력 검토 누락, 보강재 설치 길이와 간격, 배수시설 문제 등의 시공과 관련한 문제들로 인해서 붕괴가 발생한 것으로 판단되었다. 설계 시 고려해야 할 전체 사면활동에 대한 안정성 검토, 2단 형태의 보강토옹벽에서 일반적으로 사용되는 FHWA 또는 NCMA 제안방법을 적용하지 않는 등의 여러 설계상의 문제점들도 확인하였다. 또한, 이러한 안정성 평가 내용을 바탕으로 재시공될 보강토옹벽의 안정을 위한 보강대책 및 시공방안 등을 제시하였다.

Keywords

References

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