Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
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Evaluation of Applicability of CMD-SOIL using the Deep Mixing Method in Ulsan Area for the Construction of Coastal Structure Foundation

해안구조물 기초의 건설을 위해 울산지역에서의 심층혼합공법을 사용한 CMD-SOIL의 적용성 평가

  • Received : 2023.06.28
  • Accepted : 2023.08.08
  • Published : 2023.09.30
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Abstract

As global trade and maritime port environments change, the need to respond to larger and faster ships is increasing. Accordingly, new ports are being built around metropolitan cities such as Busan and Ulsan. In general, a compaction method using sand or gravel is applied to the construction of a new port. However, due to the lack of sand or gravel and the difficulty in securing economic feasibility due to the increase in unit price, the deep mixing method has recently been used. Therefore, in this study, CMD-SOIL using circulating resources was applied to the Ulsan area, and the applicability was determined by analyzing the laboratory mixing test and boring results at in-situ. As a result of the test, it was analyzed that it showed more than the design mixing strength, and it was possible to secure the similar performance as blast furnace slag cement. In addition, it was analyzed that the design standard strength can be sufficiently secured as a result of in-situ boring. Therefore, considering the field applicability in the Ulsan, it is judged that the use of CMD-SOIL is possible.

세계 무역 및 항만 산업 환경이 변화함에 따라 선박의 대형화 및 고속화에 대한 대응 필요성이 높아지고 있다. 이에 따라 부산, 울산 등 광역도시를 중심으로 신항만의 건설이 이루어지고 있다. 일반적으로 신항만 건설은 모래 또는 자갈을 사용한 다짐공법이 적용되고 있다. 하지만 모래 또는 자갈이 부족하고, 단가상승으로 인해 경제성 확보가 어려워 최근에는 단시간에 요구되는 압축강도를 확보할 수 있는 심층혼합공법이 사용되고 있다. 따라서 본 연구에서는 순환자원을 이용한 CMD-SOIL을 울산지역에 적용하고, 실내 배합시험 및 현장 확인 보링 결과를 분석하여 적용성을 판단하고자 하였다. 시험결과, CMD-SOIL은 설계 배합강도 이상을 나타내었고, 고로슬래그 시멘트와 유사한 성능을 확보할 수 있는 것으로 분석되었다. 또한 현장에서의 확인 보링 결과, 설계 기준강도 이상을 충분히 확보할 수 있어 울산지역에서의 현장 적용성을 고려할 때 CMD-SOIL의 활용이 가능할 것으로 판단된다.

Keywords

Acknowledgement

This work is supported by SME technology development support project funded by the Ministry of SMEs and Startups(Grant No. S3290334) and is supported by Korea Ministry of Science and ICT(Grant No. KICT 20230177-001).

References

  1. Back, J. D., Jeong, W. M., Lee, J. I., Choi, H. J. and Kim, M. K. (2021), "A Study on the Method of Calculating the Number of Working Days for Harbor Construction using the Wave of Ulsan New Port", Journal of the Korean Society of Coastal and Ocean Engineering, Vol.33, No.2, pp.80-91. https://doi.org/10.9765/KSCOE.2021.33.2.80
  2. Bong, T. H., Kim, B. I. and Han, J. T. (2018), "Estimation of Ultimate Bearing Capacity of SCP and GCP Reinforced Clay for Laboratory Load Test Data", Journal of the Korean Geotechnical Society, Vol.34, No.6, pp.37-47.
  3. Ham, T. G., Seo, S. G. and Cho, D. S. (2021), "Evaluation of Applicability of CMD-SOIL Recycled Resources as Ground Improvement Material for Deep Mixing Method", Journal of the Korean Geosynthetics Society, Vol.20, No.4, pp.43-52.
  4. Kim, B. I., Cho, S. M., Kim, J. H. and Kim, S. R. (2015), Soft Ground Improvement Method, CIR Publishing Co., pp.239-283.
  5. Kim, B. I., Park, E. S. and Han, S. J. (2021a), "The Case Study on the Design, Construction, Quality Control of Deep Cement Mixing Method", Journal of the Korean Geosynthetics Society, Vol.20, No.4, pp.19-32.
  6. Kim, Y. M., Kim, J. S. and Han, T. S. (2021b), "Development of Eco-Concrete Produced with Calcined Marl Clay as Cement Replacement Material", Journal of the Korean Society of Hazard Mitigation, Vol.21, No.4, pp.129-137 https://doi.org/10.9798/KOSHAM.2021.21.4.129
  7. Kim, J. H., Seo, S. G., Yoon, S. J. and Cho, D. S. (2023), "Application of Cement-Free Media Binder for the Deep Mixing Method of CMD-SOIL", Mar. Geores. Geotechnol., Vol.41, No.6, pp.682-694. https://doi.org/10.1080/1064119X.2022.2088430
  8. Korea Construction Standards Center (2021), General of Soft Ground Design, KDS 11 30 05.
  9. Ko, H. W., Seo, S. G., An, Y. J., Kim, Y. S. and Cho, D. S. (2016), "Applicability Evaluation of Eco-Friendly Binder Material using Desulfurize Dust in Deep Cement Mixing Method", Journal of the Korean Geosynthetics Society, Vol.15, No.2, pp.1-12. https://doi.org/10.12814/jkgss.2016.15.2.001
  10. Kitazume, M. (2005), The Sand Compaction Pile Method, CRC Press, London, UK.
  11. MOF (Ministry of Oceans and Fisheries) (2018), Deep Mixing Treatment Method for Mechanical Agitation, KCS 64 20 35, Korea Construction Specification.
  12. MOF (Ministry of Oceans and Fisheries) (2020), The 4th National Port Basic Plan (2021~2030), MOF.
  13. Mun, K. J. and Seo, S. G. (2018), "Marine Deep Cement Mixing Method using Grouting Material without Cement", Magazine of the Korea Concrete Institute, Vol.30, No.1, pp.33-38.
  14. Park, C. S. and Choi, J. S. (2019), "The Strength Characteristics of Deep Mixing Ground according to Increasing Water Content", Journal of the Korean Geotechnical Society, Vol.35, No.3, pp.25-35.
  15. Park, C. S. and Song, J. W. (2020), "An Analytical Study on the Determination of the Lowest Improvement Depth of Deep Mixing Method", Journal of the Korean Geosynthetics Society, Vol.19, No.1, pp.35-44.
  16. Park, H. K. and Choi, Y. W. (2017), "A Study on the Establishment of Optimal Transportation Networks in Busan New Port", Journal of the Korean Society of Civil Engineers, Vol.37, No.1, pp.125-132. https://doi.org/10.12652/Ksce.2017.37.1.0125
  17. Won, S. H., Cho, S. W. and Lee, J. H. (2015), "Counter-strategies of Busan Port against Expansion of Container Vessel Size", Journal of Shipping and Logistics, Vol.31, No.2, pp.249-274.  https://doi.org/10.37059/tjosal.2015.31.2.249