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2017 Vol.33, Issue 10 Preview Page
A Study on the Effective Restraint Method of Lateral Displacement of an Inclined Earth Retaining Structure in Soft Clay

연약점토지반에 설치된 IER 지주식 흙막이의 효과적인 수평변위억제 방법에 관한 연구

Jayoung Kim1
,
Jong-Chul Im2*
,
Minsu Seo3
,
Changyoung Kim3*
,
Eun Kyeong Park4
,
Tae Keon Park5
김 자영1
,
임 종철2*
,
서 민수3
,
김 창영3*
,
박 은경4
,
박 태건5
1Member, Ph.D Candidate, Dept. of Civil and Environmental Engrg., Pusan National Univ.)
2Member, Prof., Dept. of Civil and Environmental Engrg., Pusan National Univ.
3Member, Ph.D, Researcher, Research Institute of Industrial Technology, Pusan National Univ.
4Jinhae-gu office in Changwon
5Member, Ph.D Candidate, Dept. of Civil and Environmental Engrg., Pusan National Univ.
1부산대학교 사회환경시스템공학과 박사과정
2부산대학교 사회환경시스템공학과 정교수
3부산대학교 생산기술연구소 특별연구원, 공학박사
4경상남도 창원시 진해구청 안전건설과, 공학석사
5부산대학교 사회환경시스템공학과 박사과정
*교신저자. *Corresponding Author. 
31 October 2017. pp. 15-24
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Abstract

A self-supported temporary excavation method called Inclined Earth Retaining structure (IER) has been developed by improving an existing excavation method. The stability of the IER was proved with both model tests and field tests. Especially, the results of the model tests proved that the lateral displacement of a model retaining wall was significantly reduced in clay. In this study, the applicability of the IER installed in the soft clay ground is estimated by analyzing survey data collected in the construction field. The results of FE analysis show that the lateral displacement of the IER decreased by 70.9% of that of a single row, self-supported retaining wall using the same number of H-piles. Thus, using the IER method in the soft clay ground will increase the stability of the excavated ground with the effect restraining its lateral displacement. Furthermore, using Deep Cement Mixing (DCM) to the upper half embedded depth of front support is recommended as a subsidiary method of reducing the lateral displacement of IER in the soft clay ground based on FE analysis results.

Keywords
Inclined Earth Retaining Structure
Soft clay
Applicability
Restraint effect of lateral displacement

기존 흙막이 공법을 개선함으로, 자립이 가능하게 IER공법이 개발되었다. IER 공법의 안정성은 실내모형실험과 현장실험을 통해서 확인되었다. 특히, 점토지반에서의 실내모형실험의 결과 상당한 변위 감소효과를 확인할 수 있었 다. 본 연구에서는 IER을 점토지반에 실제 적용하여 계측데이터를 수집하였으며, 이것을 이용하여 연약점토지반에서 의 적용성에 대해 분석하였다. 그리고 수치해석을 통해 동일한 개수의 H-pile이 적용된 일열 H-pile 흙막이에 비해서 IER 공법의 수평변위가 70.9% 감소하는 것을 확인하였다. 그러므로 IER 공법을 연약점토지반에 적용하면 높은 수평 변위억제효과로 인해 지반의 안정성은 상당히 많이 증대될 것으로 판단된다. 또, 점토지반에서의 수평변위억제방법으로 전면지주의 근입부에 DCM보강을 제안하여, 수치해석을 통해 DCM 최적의 보강위치를 분석하였다. 그 결과, 굴착 저면에서 전면지주의 근입부의 중간지점까지 DCM 보강하는 것을 제안하였다.

References
1
Bowles (1996), Foundation Analysis and Design 5th Edition, McGraw Hill.
2
Chun, B. S., Lim, H. S., and Jeon, J.G. (2000), “A Study on the Design-parameter of Mixed Ground by Using Cement-type Stabilizer”, Journal of the Koeran Geotechnical Society, Koeran Geotechnical Society, Vol.16, No.2, pp.79-89 (in Korean).
3
Jeong, D. U., Im, J. C., Yoo, J. W., Seo, M. S., Koo, Y. M., and Kim, S. J. (2013), “An Experimental Study on the Inclined Earth Retaining Structure in Clay”, Journal of the Koeran Geotechnical Society, Koeran Geotechnical Society, Vol.29, No.6, pp.63-75 (in Korean).
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Seo, M. S., Im, J. C., Jeong, D. U., Yoo, J. W., Koo, Y. M., and Kim, G. H. (2012), “An Experimental Study on the Stability of Inclined Earth Retaining”, Journal of the Koeran Geotechnical Society, Korean Geotechnical Society, Vol.28, No.12, pp.99-110 (in Korean).
7
Seo, M. S., Im, J. C., Kim, C. Y., and Yoo, J. W. (2016), “A Study on the Applicability of Retaining Wall Using Batter Piles in Clay”, Canadian Geotechnical Journal, The Canadian Geotechnical Society, Vol.53, No.8, pp.1195-1212.
8
Seo, M. S., Im, J. C., Kim, J. S., Baek, S. M., Kim, J. Y., and Kim, C. Y. (2015), “A Study on the Effect for Restraining Lateral Displacement of Inclined Earth Retaining Wall through the Field Experiment”, Journal of KOSHAM, Korean Society of Hazard Mitigation, Vol.15, No.3, pp.225-264 (in Korean).
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 33
  • No :10
  • Pages :15-24
  • Received Date : 2017-06-11
  • Accepted Date : 2017-10-11
  • DOI :https://doi.org/10.7843/kgs.2017.33.10.15
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