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Research Article

The Study on the Design and Numerical Analysis of Self-Supported Retaining Wall with Cement Treated Soil by Vertical Mixing Method(V-DCM)

연직교반혼합처리(V-DCM) 연속벽을 이용한 자립식 흙막이공법의 설계 및 해석에 관한 연구

Byung-Il Kim1
,
Kang-Han Hong2
,
Young-Seon Kim3
,
Jin-Hae Kim4
,
Sang-Jae Han5*
김 병일1
,
홍 강한2
,
김 영선3
,
김 진해4
,
한 상재5*
1Member, Managing Director, Expert group for earth & environment, #1020, 53 Seonggogae-ro, Uiwang-si, Gyeonggi-do 16006, Republic of Korea
2Member, Director, Expert group for earth & environment, #1020, 53 Seonggogae-ro, Uiwang-si, Gyeonggi-do 16006, Republic of Korea
3Member, Deputy General Manager, Expert group for earth & environment, #1020, 53 Seonggogae-ro, Uiwang-si, Gyeonggi-do 16006, Republic of Korea
4Member, Deputy General Manager, Expert group for earth & environment, #1020, 53 Seonggogae-ro, Uiwang-si, Gyeonggi-do 16006, Republic of Korea
5Member, President, Expert group for earth & environment, #1020, 53 Seonggogae-ro, Uiwang-si, Gyeonggi-do 16006, Republic of Korea
*Corresponding Author
30 March 2023. pp. 9-23
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Abstract

In this study, the design methods of self-supported retaining wall with cement treated soil constructed by vertical mixing method (trencher mixing method, V-DCM), which are using in domestic and foreign field, are investigated, and the characteristics of it are presented with comparing the results of numerical analysis with the drainage and construction conditions. The results indicated that the method 1 (total stress analysis) is the most aggressive, and method 2 (effective stress analysis) and method 3 are similar in the internal stress, and the stress and the horizontal displacement are effected on the soil type and drainage conditions in backfill of the wall. Also, in the case of the design combined with numerical analysis the method 1 can be applied, in that of the traditional design without the analysis the method 2 or the method 3 can be used. Finally, if the numerical analysis is only conduct, the tensile stress in excavation base and in boundary of the wall and the original ground have to be considered in the numerical analysis method.

Keywords
Self-supported retaining wall
Soil cement wall
Vertical mixing method
Numerical analysis

본 연구에서는 연직교반혼합처리공법으로 시공되는 원지반 시멘트고화처리 연속벽체 방식의 자립식 흙막이 공법의 국내·외 설계법을 조사하고, 다양한 배수 및 시공 조건을 고려한 수치해석 결과와 비교 분석하여 각 설계법 및 해석법의 특징 등을 제시하였다. 본 연구 결과 동일한 설계조건에 대해 방법 1(전응력 해석)의 경우 가장 높은 안정성을 평가하는 것으로 나타났고, 개량체 내부에서 발생되는 응력의 경우 방법 2와 방법 3(유효응력 해석)이 유사한 결과를 도출하였다. 그리고 수치해석 시 적용한 토질 및 배수 조건에 따라 최종 흙막이 벽체의 내부응력과 수평변위가 영향을 받았다. 또한, 본 연구에서는 수치해석 등으로 검증을 병행하는 설계에서는 이론토압을 적용하는 방법 1, 수치해석적 검증을 생략하는 일반적인 설계에서는 보수적인 결과를 제공하는 방법 2 또는 방법 3, 수치해석만으로 설계하는 경우 굴착면에서의 인장응력과 개량체 선단과 원지반간의 경계면 응력 등을 고려할 것을 제시하였다.

References
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Civil Engineering Research Center (2004), Design and Construction Manual for Deep Mixing Treatment in Land Construction(Revised).
2
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3
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Jeong, G. H., Kim, Y. W., Shin, M. S., Han, K. T. and Kim, T. H. (2006), “Application for Self-Supported Retaining Wall Using Deep Cement Mixing”, KGS Spring Conference 2006.
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Kim, B. I., Kim, Y. S., Han, S. J. and Park, E. S. (2020), “The Numerical Analysis on the Behaviour of Combined Sheet Pile in the Reclaimed Ground Mixed by Sandy Soil and Clayey Soil”, J. Korean Geosynthetics Society, Vol.19, No.3, pp.9-21.
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Kim, B. I., Park, E. S. and Han, S. J. (2021), “The Case Study on the Design, Construction, Quality Control of Deep Cement Mixing Method”, J. Korean Geosynthetics Society, Vol.20, No.4, pp.19-32.
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Nakamura, M. and Katsumi, T. (2014), “Consideration of Design and Performance of Earth Retaining Wall by Shallow Cement Mixing”, Japanese Geotechnical Journal, Vol.10，No.3，pp.329-342. 10.3208/jgs.10.329
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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 22
  • No :1
  • Pages :9-23
  • Received Date : 2023-02-13
  • Revised Date : 2023-03-08
  • Accepted Date : 2023-03-09
  • DOI :https://doi.org/10.12814/jkgss.2023.22.1.009
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