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Improvement Effect and Electrical Characteristics of Soft Ground with Plastic Electrode Spacing

전극간 거리에 따른 연약지반의 지반개량 효과와 전기적 특성

  • Received : 2015.09.03
  • Accepted : 2015.11.25
  • Published : 2016.01.01

Abstract

Soft ground stabilization is needed to construct large civil facilities on the soft clay ground. Pre-loading method, which is accelerating consolidation method, is generally used to stabilize the soft ground. However, pre-loading method is required long construction period and quantities of fill material. Therefore, electro-osmosis method is used to replace pre-loading method for stabilizing the soft ground. Electro-osmosis method is disadvantageous in constructive and economic aspects because it is needed a metallic electrode. So, in order to solve the those disadvantages, plastic electrode was developed to replace metallic electrode. Plastic electrode, which is made by using nano-technology on existing Plastic Drain Board (PDB), was used to supply the electric power. In this study, therefore, the model test was conducted to confirm the effect of improvement and electrical characteristics of soft ground by spacing of plastic electrode. The result shows that the effect of improvement of soft ground was decreased up to 45% by increasing electrode spacing and electrical characteristics on the soft ground were influenced by consolidation settlement with electrode spacing.

연약한 점토지반에 대규모 토목시설을 건설하기 위해서는 연약지반 안정화 처리가 불가피하다. 일반적으로 연약지반 안정화 처리를 위해 압밀촉진공법으로 선행재하공법이 사용되고 있으나 선행재하공법은 공사기간이 매우 길고, 재하용 성토재료를 확보해야 하는 단점이 있기 때문에 이를 해결하기 위한 방법으로 전기삼투공법 등이 사용되고 있다. 전기삼투공법은 금속성 전극재가 사용되기 때문에 시공 및 경제적 측면에서 불리하다. 따라서 금속성 전극재를 대신하기 위해 기존 플라스틱 드레인 보드(PBD)에 전기를 공급할 수 있도록 나노기술을 이용한 플라스틱 전극재가 개발되었다. 이에 본 연구에서는 플라스틱 전극재의 간격에 따른 연약지반의 개량 효과와 전기적 특성을 확인하기 위한 모형실험을 수행하였으며, 그 결과 지반개량 효과는 전극간 거리가 길수록 최대 49% 감소하였고 전기적 특성은 전극간 거리에 따른 압밀침하에 영향을 받는 것으로 나타났다.

Keywords

References

  1. Ahn, K. K., Jeong, K. S. and Lee, J. D. (2009), Characteristics on electroosmosis ground improvement using nano-geosynthetics, Journal of the Korean Geo-Environmental Society, Vol. 10, No. 4, pp. 59-63 (in Korean).
  2. Ahn, K. K., Park, S. B. and Lim, G. S. (2012), Effect of electroosmosis ground improvement with changing pH, Journa of the Institute of Construction Technology, Vol. 31, No. 2, pp. 115-120 (in Korean).
  3. Ahn, S. R. (2011), Effect of electrode efficiency for electroosmosis ground improvement, Master's thesis, Graduate School of Chungbuk National University, pp. 1-55 (in Korean).
  4. Sin, D. C. (2010), Characteristics on electrokinetic ground improvement accoding to electrode types, Master's thesis, Graduate School of Chungbuk National University, pp. 1-47 (in Korean).
  5. Sin, T. J. (2011), Characteristics on electroosmosis ground improvement of marin clay, Master's thesis, Graduate School of Chungbuk National University, pp. 1-53 (in Korean).