KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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The Experimental Study on Electrokinetic Injection Improvement of Low Permeable Ground

저 투수성 지반의 동전기 주입 개량의 실험 연구

  • 김수삼 (한양대학교 토목환경공학과) ;
  • 한상재 (한양대학교 토목환경공학과) ;
  • 김기년 (한양대학교 토목환경공학과 대학원)
  • Received : 2005.09.26
  • Accepted : 2005.10.27
  • Published : 2006.03.30
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Abstract

In this study a series of bench scale test are conducted to increase the undrained shear strength of clayey soils using by Electro-kinetic injection stabilization method. The sodium silicate was injected in anode reservoir and its concentration was changed with 500, 1000, 1500, 2000, 2500mM for configuration of applicability of Electro-kinetic injection stabilization method. Also, the treatment time and electric gradient was changed to acquire the optical influence factors. For increasing the shear strength to maximum values, the calcium chloride and aluminium hydroxide, which concentration was changed with 50, 250, 500, 750, 1000mM, were added at anode reservoir for 5 days after the treatment of sodium silicate in 5 days as the 2nd additives. The test of results in determination of sodium silicate concentration show that the undrained shear strength at each point had a tendency to converge into a constant value when the concentration of sodium silicate came to 1000mM and above. The maximum shear strength increasement was 800% compared with initial value. After a series of test, the electric gradient and treatment time for application of electric fielld were 1V/cm and 6 days. In case of 2nd additives test, the concentration for maximum shear strength is 250mM in all additives and the effects of shear strength improvement was developed approximately 20~30% in comparison to addition of single injection material.

본 연구에서는 점성토의 강도를 증진시키기 위해, 일련의 동전기 주입 안정화 실내 실험을 수행하였다. 이를 위해 규산나트륨을 주입제로 선정하고 농도를 변화(500, 1000, 1500, 2000, 2500mM)시켜 동전기 주입 안정화 기법의 적용성을 파악하였고, 처리기간과 전압경사에 따른 영향을 파악하기 위해 2일 간격(2, 4, 6, 8, 10일)으로 처리기간을 설정한 실험과 0.25, 0.5, 1.0, 1.5, 2.0V/cm로 전압경사를 변화시킨 실험을 실시하였다. 또한 염화칼슘과 수산화알루미늄을 2차 주입제로 사용하여 첨가농도에 따른 전단강도 개량 효과를 파악하고자 하였다. 이를 위해 규산나트륨(1000mM)을 5일간 적용한 후 2차 주입제의 농도를 50, 250, 500, 750, 1000mM로 변화시켜 5일간 적용하였다. 규산나트륨의 농도 결정시험결과 1000mM 이상의 농도에서 일정한 값으로 수렴하는 양상을 띠었으며, 이 때 초기 강도보다 약 800% 크게 강도증진효과가 나타났다. 최적전기경사와 처리기간 결정시험결과 전압의 경우 1V/cm, 처리기간의 경우 6일 이상에서 강도증가치가 수렴하는 양상이 나타났다. 염화칼슘과 수산화알루미늄을 2차 주입제로 사용한 경우, 두 경우 모두 250mM 이상의 농도에서 일정한 강도값으로 수렴하는 양상이 나타났으며, 규산나트륨만 사용한 경우보다 약 20~30%의 강도증진효과가 발생했다.

Keywords

References

  1. 김기년(2005) Electro-kinetic 주입에 의한 점섬토의 강도증진에 관한 실험적 연구, 석사학위논문, 한양대학교
  2. Acar Y. B., Alshawabkeh A. N. (1993) Principles of electrokinetic remediation. Environmental, Science and Technology, Vol. 27, No. 13, pp. 2638-2647 https://doi.org/10.1021/es00049a002
  3. Alshawabkeh A. N., Sheahan T. C., Xingzhi Wu. (2003) Coupling of electrochemical and mechanical processes in soils under DC fields, Mechanics of Materials
  4. Barron, R. A. (1948) Consolidation of fine-grained soil by drain well, Geotextile and Geomembranes, Vol. 10, No. 3
  5. Bjerrum, L. (1967) Engineering geology of normally consolidated marine clays as related to settlement of buildings, Geotechnique, Vol. 17, No. 2, pp. 82-118
  6. Dise, K., M. G. Stevens, and J. L. Von Thun. (1994) Dynamic compaction to remediate liquefiable embankment foundation soils, GPS No. 45, ASCE, Reston, VA
  7. Eykholt G. R. (1992) Driving and Complicationg Features of the Electrokinetic Treatment of Contaminated Soils, Ph. D Thesis, University of Texas at Austin, pp. 269
  8. Hansbo, S. (1979) Consolidation of clay by band-shaped prefabricated drains, Ground Engineering, Vol. 12, No. 5, pp. 16-25
  9. Ingles, O. G. & Metcalf, J. B. (1972) Soil Stabilization, Butterworths Pty. Limited, Sydney
  10. Karol, R. H. (2003) Chemical Grouting and Soil Stabilization-3rd edition, Revised and Expanded, Marcel Dekker, INC., New York
  11. Luehring, R., Snorteland, N., Stevens, M., and Mejia, L. (2001) Liquefaction mitigation of a silty dam foundation using vibrostone columns and drainage wick: A case history at salman lake dam, Proc. Dam Safety Conference, Sept. 11-15, Colorado
  12. Madshus, P. A. and Janbu, N. (1984) Improvement of quick clay by electrolysis, Scandinavian Geotechnical Meeting, Sweden, Bulletin 17
  13. Mitchell, J. K. and Klainer, E. (1987) Chemical stabilization of landslides, Research Report, UCB-ITS-RR-87-16, Institute of Transportation Studies, University of California, Berkeley
  14. Mitchell, J. K. (1993) Fundmentals of soil behavior-2rd edition, Wiley Interscience, pp. 256-258
  15. Ozkan. S, Gale. R. J, Seals. R. K. (1999) Electrokinetic stabilization of kaolinite by injection of Al and $PO_{4}^{3-}$ ions, Ground Improvement. Volume GI03. Issue 04
  16. Shan and Shroff (1985) Resin grout system for rock treatment, Proc. Indian Goeotech. Conference, Roorkee Sarita, Prakashan, Meerut, pp. 203-208
  17. Skempton, A. W. (1953) Soil mechanics in relation to geology, Proc. of Yorkshire Geological Soc., Vol. 29, pp. 33
  18. Thevanayagam, S., Martin, G. R., and T. Shenthan (2002) Ground remediation for silty soils using composite stone columns(Task 150 C104E), Seismic Vulnerability of the highway System, FHWA Contract # DTFH 61-98-C-00094
  19. Thevanayagam, & Jia (2003) Electro-osmotic grouting for liquefaction mitigation in silty soils, ASCE Special Technical Publication, No. 120
  20. Van Impe, W. F. (1989) Soil improvement techniques and their evolution, A.A.Balkema, Rotterdam
  21. Yamanouchi, T., Miura, N. (1982) Soil improvement with quicklime and filter fabric, ASCE, Vol. 108, No. GT7, pp.35-46