Journal of the Korean GEO-environmental Society (한국지반환경공학회 논문집)

Korean Geo-Environmental Society (한국지반환경공학회)
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Determination of Characteristics of Laboratory Test and Proper Specification of Reformed Dredging Soil for Applying Pipe Mixing Method

관중혼합공법의 적용을 위한 개질처리 준설토의 실내실험 특성 및 적정 규격 결정

  • Jeon, Sangok (Rural Research Institute, Korea Rural Community Corporation) ;
  • Kang, Byungyoon (Rural Research Institute, Korea Rural Community Corporation) ;
  • Baek, Seungcheol (Department of Civil Engineering, Andong National University)
  • Received : 2022.01.27
  • Accepted : 2022.03.07
  • Published : 2022.05.01
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Abstract

In order to improve dredged area, long time and high cost is needed because of bad engineering and physical conditions. And there is no suitable example of pipe mixing method at domestic site. Moreover, applicability and effectiveness of this method is uncertain and shows different results between site and laboratory test. In order to solve these problems, we determined proper grain size distribution and water content range using dredged soil and reformed material (standard sand & material controlling grain size distribution) in the laboratory test. As a result, we confirmed that coefficient of sediment consolidation is increased and there is an improvement about separation sedimentation. Undrained shear strength was derived by water content of reformed dredging soil through regression analysis of test results. We suggest the correlation equation for determining mixing ratio.

준설 매립지반의 경우 공학적, 물리적 조건이 열악하여 매립현장에서 이를 개량하기 위한 시간과 비용이 많이 든다. 또한 국내 실정에 적합한 관중혼합 이송처리 공법의 적용사례가 없고 공법 적용성 및 효과에 관하여 불확실할 뿐 아니라 실제 현장과 실내실험 간의 차이가 발생할 수 있다. 이러한 문제점을 해결하기 위해 개질재(표준사+입도조절재)가 혼합된 준설토를 대상으로 실내 특성실험을 통해 개질재의 적정한 입도분포 및 함수비 범위를 결정하였다. 그 결과 단계투기 시 침강압밀계수가 증가하고 분리침강에 대한 개선효과가 있는 것으로 확인되었다. 실험결과 회귀분석을 통해 개질 처리토의 함수비에 따른 비배수전단강도를 도출하고, 이를 활용하여 배합비를 결정할 수 있는 상관식을 제시하였다.

Keywords

Acknowledgement

The research in this paper was conducted with funding by Korea Agency for Infrastructure Technology Advancement (KAIA) as part of the "Research on Eco-friendly Procurement, Reclamation and Transferring Technology of Transport Distance more than 30 km of Dredged Materials" research project.

References

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