A case Study on Collapse Causes and Restoration of Retaining Wall with Vegetated Concrete Block

Gigwon Hong; Seung-Kyong You; Jung-Mann Yun; Jong-Beom Park; Kwang-Wu Lee

doi:10.12814/jkgss.2016.15.4.105

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A case Study on Collapse Causes and Restoration of Retaining Wall with Vegetated Concrete Block 식생블록 옹벽의 붕괴원인 및 복구방안에 관한 사례 연구

30 December 2016. pp. 105-115

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Abstract

This paper describes a restoration of retaining wall, which was collapsed by rainfall. The failure causes was analyzed by field case, and then the countermeasure was suggested. The failure causes confirmed that observance of design and construction criteria was insufficient. It also was the climate condition like a rainfall and inappropriate construction management. The stability analysis for retaining wall, soil improvement and reinforced earth wall was conducted to confirm validity of the countermeasure. The analysis results showed that the suggested construction method satisfied in required safety factors. Therefore, it should be secured the stability of the structure based on the application of appropriate design method and construction management, when structure was constructed.

Keywords

Collapsed wall

Reinforced earth wall

Earth retaining wall

Restoration

본 연구에서는 강우에 의해 붕괴가 발생한 식생옹벽의 현장사례를 바탕으로 붕괴원인을 분석하였으며, 분석결과를 이용하여 복구방안을 제시하였다. 또한 복구방안으로 제시된 대책공법에 대한 안정성을 평가함으로써, 그 타당성을 검증하였다. 사례현장의 붕괴원인 분석결과, 지반조사 및 옹벽구조물에 대한 안정성 검토를 수행하지 않은 채 구조물 계획을 수립하였고, 배수계획 누락과 재료 및 다짐관리 기준이 현행 국가기준에서 요구하는 수준을 만족하지 못하는 등 현장조건에 부합하는 설계가 이루어지지 않았다. 또한, 가시설 공법 검토 및 시공관리의 미흡 등도 붕괴의 주요 원인으로 판단하였다. 이를 바탕으로 흙막이 구조물, 지반보강 및 블록식 보강토옹벽을 이용하여 현장조건이 고려된 복구 대책공법을 제시하였다. 그리고 각 공법의 안정성을 평가한 결과, 소요안전율을 확보함으로써 제시된 대책공법으로써의 타당성을 검증하였다. 따라서 옹벽구조물의 시공 시에는 적합한 설계법의 적용과 함께 시공관리를 통하여 구조물의 안정성을 확보할 필요가 있음을 확인하였다.

References

1.Kang, N. H. (2013), A study about application of steel slag aggregate for vegetation retaining wall block, M.S. thesis, Sunchon National Univ (in Korean with English abstract).

2.Lee, K. W. and Cho, I. H. (2016), “Restoration of Collapsed Retaining Wall”, Proc. of Geosynthetics Conference Spring 2016, Seoul, Korea, pp.81-82 (in Korean).

3.Lee, S. M. (2013), Evaluation on stability of reinforced retaining wall constructed with vegetated soilbag facing through connection strength test, M.S. thesis, Incheon National Univ (in Korean with English abstract).

4.Nam, S. H. (2015), “Construction Method of Reinforced Earth Retaining Walls for Vegatation Landscape Using Strip-type Geosynthetic Reinforcement with Folding Grooves and Passive Resistance Parts”, Proc. of Geosynthetics Conference Fall 2015, Seoul, Korea, 42p (in Korean).

5.Oh, B. H., Cho, I. H., Lee, Y. S. and Lee, K. H. (2003), “Development of Strengthening Method and Safety Analysis of Ecological Block and Vegetation Bank Protection”, Journal of The Korea Institute for Structural Maintenance and Inspection, Vol.7, No.1, pp.207-215 (in Korean with English abstract).

6.Park, J. K. and Lee, K. W. (2012), “A Study on Practices and Troubles of Reinforced Soil Wall”, Journal of the Korean Geosynthetics Society, Vol.11, No.1, pp.65-75 (in Korean with English abstract).10.12814/jkgss.2012.11.1.065

7.Yoo, C. S., Jeon, H. Y., Jung, H. Y. and Jung, H. S. (2005), “Geosynthetic Reinforced Segmental Retaining Wall Failure During Heavy Rainfall - A Case Study”, Journal of the Korean Geotechnical Society, Vol.21, No.4, pp.135-143 (in Korean with English abstract).

Information

Publisher :Korean Geosythetics Society
Publisher(Ko) :한국지반신소재학회
Journal Title :Journal of the Korean Geosynthetics Society
Journal Title(Ko) :한국지반신소재학회 논문집
Volume : 15
No :4
Pages :105-115
Received Date : 2016-12-07
Revised Date : 2016-12-22
Accepted Date : 2016-12-25
DOI :https://doi.org/10.12814/jkgss.2016.15.4.105

Journal of the Korean Geosynthetics Society ISSN:2508-2876(Print) 2287-9528(Online) 한국지반신소재학회 논문집

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