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원심모형실험을 이용한 준설토의 침강압밀 거동 특성

A Study on Characteristic of Sedimentation-Consolidation Conduct for Dredged Soil through Geo-Centrifuge Test

  • 투고 : 2016.12.23
  • 심사 : 2017.01.25
  • 발행 : 2017.02.01

초록

해양 매립 공사는 해저의 해성점토를 해수와 함께 준설하여 매립지로 이동시켜 매립지를 형성시키는 공사이다. 매립지가 형성되는 과정에서 준설토는 침강-퇴적-압밀 과정이 진행되며 이 과정에서 압밀과정은 소요되는 시간과 침하량이 크기 때문에 매립지를 계획하는 해양 매립 공사에서 매우 중요한 결정인자로 사용하게 된다. 준설토의 침하량과 소요되는 시간을 예측하기 위한 방법으로 국내에선 Yano가 제안한 Column 실험이 보편적으로 사용되고 있다. 그러나 Yano의 Column 실험은 준설토의 침강압밀특성을 확인하기 위해 장시간이 필요한 단점이 있다. 따라서 본 연구에서는 장시간이 소요되는 Column 실험의 단점을 보완해 단시간에 준설토의 침강압밀특성을 확인하기 위한 방법으로 원심모형실험을 활용하였다. 그 결과 효율적으로 준설토의 침강압밀특성을 확인하기 위해 원심모형실험을 활용할 수 있는 것으로 사료된다.

The costal reclamation construction is for making reclaimed land by dredging marine clay with seawater, and then bringing the dredged soil into the reclaimed land. During the process, the dredged soil in the reclaimed land undergoes the sedimentation-consolidation process. Among the processes, the consolidation is a very critical factor when planning reclaimed land because of its requiring time and settlement. In order to predict the requiring time and settlement, the Column test, which was suggested by Yano, has been usually used in the nation. However, the test method needs a very long time to identify the characteristic of sedimentation-consolidation of dredged soil. Therefore, in this study, in order to supplement the weakness of the Column test which needs such a long time, and in order to identify the characteristic of the sedimentation-consolidation for dredged soil in a short time, the Geo-centrifuge test was examined as an alternative method. The result considered that Geo-centrifuge test would be useful to identify the characteristic of sedimentation-consolidation for dredged soil efficiently.

키워드

참고문헌

  1. Ahk, K. K., Lee, K. H., H. Y. and Kang, H. S. (2014), Sedimentation characteristics of dredged soil by geo-centrifuge, Journal of the Korean Geo-Environmental Society, Vol. 15, No. 3 pp. 49-55 (In Korean). https://doi.org/10.14481/JKGES.2014.15.3.49
  2. Choi, H. S., Kwak, T. H., Lee, D. S., Lim, J. H., Stark, T. D. and Choi, E. S. (2012), 2-D axisymmetric non-linear finite strain consolidation model considering self-weight consolidation of dredged soil, Journal of the Korean Geotechnical Society, Vol. 28, No. 8, pp. 5-19 (In Korean). https://doi.org/10.7843/kgs.2012.28.8.5
  3. Gibson, R. E., England, G. L. and Hussury, M. J. L. (1967), The theory of one-dimensional consolidation of saturated clay I: Finite Non-linear Consolidation of Thin Homogeneous Layers, Geotechnique, Vol. 17, No. 3, pp. 261-273. https://doi.org/10.1680/geot.1967.17.3.261
  4. Jun, S. H. and Yoo, N. J. (2009), An experimental study on sedimentation-consolidation cahacteristics for marine clay in Korea, Jouranl of the Korea Geo-Environmental Society, Vol. 10, No. 6, pp. 89-98 (In Korean).
  5. Jun, S. H., Yoo, N. J. and Park, B. S. (2008), Evaluation of constitutive relationships and consolidation coefficients for prediction of consolidation characteristics of dredged and reclaimed ground, Journal of the Korean Geo-Environmental Society, Vol. 9, No. 6, pp. 31-41 (In Korean).
  6. Kim, H. J., Lee, M. S., Lee, Y. J. and Kim, D. W. (2003), A study on the sediment volume change and two-dimensional deposited characteristics of pumping-dredged soil, Journal of Geotechnical engineering Society, Vol. 19, No. 4, pp. 155-165 (In Korean).
  7. Lee, C. W. and Choi, H. S. (2016), Experimental and numerical studies for sedimentation and consolidation characteristics of dredged soil in Songdo Area, Incheon, Journal of the Korean Geo-Environmental Society, Vol. 17, No. 2, pp. 13-22 (In Korean). https://doi.org/10.14481/JKGES.2016.17.2.13
  8. Lee, S. H. and Lee, J. H. (2011), An experimental research about setting and consolidation characteristic of dredged soil in West Coast, Journal of the Korean Geo-Environmental Society, Vol. 12, No. 5, pp. 29-36 (In Korean).
  9. Lee, S. W., Gu, B. H., Choi, C. S. and Lee, J. H. (2015), The characteristics of sedimentation-consolidation and surface strength for dredging and landfill areas in Each Coast, Journal of the Korean Geo-Environmental Society, Vol. 16, No. 7, pp. 15-22 (In Korean).
  10. Mikasa, M. (1963), The consolidation of soft clay-a new consolidation theory and its application, Kajima Institution Publishing Co., Ltd., Tokyo, Japan, pp. 126-140 (In Japanese).
  11. Yano, K. (1985), Properties of very soft ground reclaimed by dredged marine clay and their prediction, Trans. Japan Society of Civil Engineering, Vol. 364, pp. 1-14 (In Japanese).