서해안 준설토의 역학적 특성 및 시간경과에 따른 강도 특성에 관한 연구

A Study on the Mechanical Characteristic and Shear Strength haracteristic on Elapsed Time of the Western Sea Dredged Soils

  • Kim, Hongtaek (Hongik University Department of Civil Engineering) ;
  • Han, Yeonjin (Hongik University Department of Civil Engineering) ;
  • Yu, Wandong (Hongik University Department of Civil Engineering)
  • 발행 : 2013.02.01

초록

서해안 지역의 준설토는 실트 또는 세립모래 성분이 많은 특성으로 인해 성토재로 직접 사용되는 사례가 증가하고 있으나, 준설토를 성토재로써 활용하는 연구에 대해서는 미흡하다. 이에 본 연구에서는 서해안 지역의 준설토를 성토재료의 활용성을 확인 하고자 하였다. 우선적으로 피에조콘 관입시험을 통해서 준설 지반의 구성성분을 확인함으로써 성토재의 활용 가능성을 우선적으로 확인하였다. 준설토에 대한 침강 및 자중압밀시험을 시행하여 준설토의 특성을 평가하는 동시에 침강 및 자중압밀이 완료된 시료에 대해서 다짐시험 및 직접전단시험을 시행함으로써 준설토의 준설완료 시점의 특성을 확인하였다. 아울러 침강 및 자중압밀이 완료 된 시료를 자연배수시킴으로써 시간이 경과됨에 따라서 준설토가 보이는 역학적 특성을 확인하고자 하였다. 실트, 실트질 모래 및 모래성분이 다량 포함되고 있는 서해안 지역의 준설토는 자연배수 시간이 경과함에 따라서 단위중량과 전단강도가 증가되는 특성 을 보이는 것으로 평가되었다.

The dredged soils of western sea of Korea have been used as the fill materials because it possess the characteristics that constitute silt, silty sand and sand mainly. However, a study on dredged soils as the fill materials is insufficient. Hence, in this present study, the application the dredged soils of western sea of Korea as the fill materials was confirmed. Primary, the composition characteristics of the ground was analyzed to confirm the application on dredged soils as the fill materials by the piezo-cone penetration test. In laboratory test, it was performed the self-weight consolidation test for mechanical characteristics of the dredged soils. The direct shear test using self-weight consolidation test sample for shear strength characteristics was performed after self-weight consolidation test. Additionally, the mechanical characteristics of the dredged soils on elapsed time using self-weight consolidation test sample, which is drained naturally, was evaluated. The dredged soils of western sea of Korea show that unit weight and shear strength is increased as natural drain time elapses.

키워드

참고문헌

  1. 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
  2. Jun, S. H. and Yoo, N. J. (2009), An experimental study on sedimentation-consolidation characteristics for marine clay, Journal of Korean Geo-Environmental Society, Vol. 10, No. 6, pp. 89- 98 (in Korean).
  3. Kim, H. T., Kim, S. Y., Kang, I. K. and Kim, S. W. (2001), A study on the prediction of shear strength and determination of the embarkation time of equipment in dredged clay fills, Journal of Korean Geo-Environmental Society, Vol. 2, No. 3, pp. 47-56 (in Korean).
  4. Lee, S., Lee, K. H. and Shim, M. B. (1999), Experimental study on the estimation of volume change for dredged clay, Korean Society of Civil Engineers Journal, Vol. 19, No. 3-5, pp. 985-994 (in Korean).
  5. Lee, S. J., Yoon, G. L., Lee, Y. G., Lee, K. D., Kang, I. G., Kim, H. T. and Baek, S. C. (2007), Shear strength characteristics of dredged soil with oyster shell binder, Journal of Korean Geo-Environmental Society, Vol. 8, No. 1, pp. 29-32 (in Korean).
  6. 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).
  7. Robertson, P. K. (1990), Soil classification using the cone penetration test, Canadian Geotechnical Journal, Vol. 27, No. 1, pp. 151-158. https://doi.org/10.1139/t90-014
  8. 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).