Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
권호 표지
DOI QR코드

DOI QR Code

Characteristics of Soil-Water Characteristic Curve and Unsaturated Permeability of Sludge Mixture

정수슬러지 혼합토의 함수특성곡선과 불포화 투수 특성

  • Received : 2012.12.10
  • Accepted : 2013.01.25
  • Published : 2013.02.28
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, in order to solve high water content of water sludge and promote its recycle, sludge mixtures with various mixing ratios were produced. Sludge mixture consisted of water sludge and weathered granite soil. Their physical properties and unsaturated characteristics (soil-water characteristic curve, and unsaturated permeability function) were investigated by laboratory tests. Experimental test results indicated that at a given matric suction volumetric water content of sludge mixture increased as water sludge content increased. Air entry values of sludge mixture increased from 0.9 kPa to 2.4 kPa with an increase in water sludge content or fine content. In addition, unsaturated permeability function, which is an important factor for performing infiltration analysis, was predicted using saturated permeability and soil-water characteristic curve of sludge mixture.

본 논문에서는 정수슬러지의 고함수비 문제를 해결하고 재활용을 촉진하기 위해 정수슬러지와 화강풍화토를 다양한 배합비로 혼합하여 슬러지혼합토(sludge mixture)를 제작하고, 다양한 실내 시험을 통해 슬러지혼합토의 물리적 특성과 불포화 특성을 분석하였다. 시험 결과, 정수슬러지 함량이 증가함에 따라 동일한 모관흡수력에 대응하는 체적 함수비는 증가하였다. 또한 정수슬러지 함량 또는 세립분 함량이 증가함에 따라 공기함입치는 0.9kPa에서 2.4kPa로 증가하였다. 슬러지혼합토의 포화투수계수 값과 함수특성곡선의 결과를 활용하여 강우 시 침투해석을 수행하는데 있어서 중요한 인자인 불포화 투수함수를 산정하였다.

Keywords

References

  1. ASTM (2003), "Standard Test Methods for Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter", D 5084.
  2. Chung, Y. I. and Yu, J. G. (2006), "Geotechnical Properties of Water Treatment Plant Sludge", Journal of Water Science and Technology, Vol.14, No.2, pp.17-25.
  3. Chun, B. S., Kim, Y. H., and Oh, M. Y. (1992), "Geotechnical Characteristics of Water Sludge as construction material", Korean Society of Civil Engineers(KSCE) Conference 1992, KSCE, Vol.1992, No.1, pp.543-546.
  4. Fredlund, D. G., Xing, A., and Huang, S. (1994), "Predicting the Permeability Function for Unsaturated Soils using the Soil-Water Characteristic Curve", Canadian Geotechnical Journal, Vol.31, pp.533-546. https://doi.org/10.1139/t94-062
  5. Hwang, H. U., Kim, J. H., and Kim, Y. J. (2009), "Recycling of Waterworks Sludge in Red Clay Bricks Manufacturing", Journal of Korean Society of Environmental Engineers, Vol.31, No.3, pp.217-222.
  6. Kim, J. U., Kim, M. K., and Bae, W. S. (2011), "The Engineering characteristics of Sludge Mixed Soil", Journal of Korean Geo- Environmental Society, Vol.12, No.5, pp.43-50.
  7. Kim, Y. K., Choi, K. L., Lee, S. J., Lee, S. R., and Kwon, H. S. (2010), "Estimation of Unsaturated Permeability Function from Water Retention Characteristics for Korean Weathered Soils", Journal of Korean Geotechnical Society(KGS), Vol.26, No.10, pp.49-60.
  8. Lee, I. M., Cho, W. S., Kim, Y. U., and Sung, S. G. (2003), "In-situ Monitering of Matric Suctions in a Weathered Soil Slope", Journal of Korean Geotechnical Society(KGS), Vol.19, No.1, pp. 41-49.
  9. Lee, S. J., Lee, S. R., and Jang, B. S. (2002), "Unsaturated Shear Strength Characteristics of Weathered Granite Soils", Journal of Korean Society of Civil Engineers (KSCE), Vol.22, No.1, pp.81-88.
  10. Lee, S. R., Kim, Y. K., and Kwon, I. B. (2005), "Smart Measurement System for Rainfall Induced Unsaturated Soil Slopes Instability", Korean Society of Civil Engineers (KSCE), Conference 2005, KSCE, Vol.2005, No.10, pp.2899-2902.
  11. Lee, S. R., Kim, Y. K., Choi, J. C., and Oh, J. K. (2006), "Measurements of Variation of Unsaturated Soil Properties in Compacted Road Slope due to Rainfall Infiltration", Korean Society of Civil Engineers (KSCE), Conference 2006, KSCE, Vol.2006, pp.1160-1163.
  12. Ministry of Land, Transport and Maritime Affairs:MLTM (2008), http://www.oceandumping.re.kr
  13. National Disaster Management Institute:NDMI (2010), "A study on Weighting Factors affecting Steep-slope Failure considering Rainfall Infiltration", pp.82-93.
  14. National Disaster Management Institute:NDMI (2011), "Development of Steep-slope Risk Evaluation Model Considering Rainfall and Soil Infiltration Characteristics", pp.77-86.
  15. Phoon, K. K, Santoso, A., and Quek, S. T. (2010), "Probabilistic Analysis of Soil-Water Characteristic Curves", Journal of Geotechnical and Geoenvironmental Engineering, 136(3), pp.445-455. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000222
  16. Rahardjo, H., Vilayvong, K., and Leong, E. C. (2011), "Water Characteristic Curve of Recycled Materials", Geotechnical Testing Journal, Vol.34, No.1, pp.89-96.
  17. Ryu, C. H. (2000), "Measurements of Permeability Characterisitcs for Unsaturated Weathered Soils", Journal of Korea Water Resources Association(KWRA), Vol.33, No.1, pp.133-142.
  18. Sahin, U., Angin, I., and Kiziloglu, F. M. (2008), "Effect of Freezing and Thawing Processes on some Physical Properties of Saline-Sodic Soils mixed with Sewage Sludge or Fly ash", Journal of Soil and Tillage Research, Vol.99, pp.254-260. https://doi.org/10.1016/j.still.2008.03.001
  19. Sales, A. and Souza, F. R. (2009), "Concretes and Mortars Recycled with Water Treatment Sludge and Construction and Demolition Rubble", Journal of Construction and Building Materials, Vol.23, pp.2362-2370. https://doi.org/10.1016/j.conbuildmat.2008.11.001
  20. Shin, B. W., Lee, B. J., Lee, J. K., and Kang, J. B. (2003), "Soil-Water Characteristics of Unsaturated Decomposed Granite Soils", Journal of Korean Geotechnical Society(KGS), Vol.4, No.1, pp.49-58.
  21. Sillers, W. S. and Fredlund, D. G. (2001). "Statistical assessment of soil-water characteristic curve models for geotechnical engineering", Canadian Geotechnical Journal, Vol.38, pp.1297-1313. https://doi.org/10.1139/t01-066
  22. Yu, J. G. (2004), "Engineering Characteristics of Water Sludge", Kei-Myung University Graduate School, pp.54-55.
  23. Yun, D. H., Lee, B. H., and Kim, Y. T. (2012), "Strength and Leaching Characteristics of Water Sludge-added Lightweight Soil Considering Reinforcing Material and Layer", Journal of Korean Geo-Environmental Society, Vol.13, No.8, pp.75-84.

Cited by

  1. 정수슬러지를 사용한 조합토의 개발 vol.51, pp.4, 2013, https://doi.org/10.4191/kcers.2014.51.4.317