Modelling the effect of suction change on a tropical black clay aquitard during consolidation

• Autorzy: Ojuri O.O. , Okonta F. N.
• Języki publikacji: EN

Abstrakty

EN

Consolidation of clayey contaminant barriers such as aquitards (natural aquifer barriers) and landfill liners can be a cause for early breakthrough of contaminants. The general objective of this research was to numerically model the rate of dissipation of pore pressures (soil suction) and change in the void ratio/soil permeability characteristics for a loaded black cotton soil (BCS) aquitard layer and thus evaluate the level of groundwater protection in semi-arid regions with BCS cover. Soil suction change was simulated by varying the degree of saturation of the expansive black clay and applying consolidation pressure. A modified Terzaghi’s 1-D consolidation equation was modeled using experimental data from the compressibility characteristics of Black cotton soils for various degrees of saturation. Proposed models for predicting the rate of dissipation of pore pressures and change in void ratio were established for the loaded BCS aquitard layer. The modeling results demonstrate the significance of evaluating the hydraulic properties of soils in relationship to their environments under simulated groundwater table and degree of saturation conditions.

Słowa kluczowe

EN

modelling; soil suction change; black clay; soil; consolidation; natural aquifer barrier; contaminant; pore pressure; soil pore; expansive black clay

• Wydawca: -
• Czasopismo: Polish Journal of Environmental Studies
• Rocznik: 2013
• Tom: 22
• Numer: 5
• Opis fizyczny: p.1419-1430,fig.,ref.

Twórcy

autor

Ojuri O.O.

• Department of Civil Engineering Science, University of Johannesburg, Johannesburg, Auckland Park, South Africa

autor

Okonta F. N.

• Department of Civil Engineering Science, University of Johannesburg, Johannesburg, Auckland Park, South Africa

Bibliografia

• 1. DANIEL T. P. Influence of drainage condition on shear strength parameters of expansive soils. Unpublished M. Sc. thesis Addis Ababa University, Addis Ababa, Ethiopia, pp. 33, 2004.
• 2. OSINUBI K.J., THOMAS S. A. Influence of compactive efforts on bagasse ash treated black cotton soil. Nigerian Journal of Soil and Environmental Research, 7, 92, 2007.
• 3. IORLIAM A. Y., AGBEDE I. O., JOEL M. Effect of cement kiln dust (CKD) on some geotechnical properties of black cotton soil (BCS). Electronic Journal of Geotechnical Engineering, 17, (H), 2012. [online] http://www.ejge.com/2012/Ppr12.088alr.pdf (Accessed 14 June 2012).
• 4. ADEKEYE J. I. D., ISHAKU J. M. Groundwater contamination in shallow aquifers of Jimeta metropolis, Adamawa State, N. E. Nigeria. Zuma Journal of Pure and Applied Sciences, 6, (1), 150, 2004.
• 5. IJIMDIYA, T. S., OSINUBI, K. J. Attenuative capacity of compacted black cotton soil treated with bagasse ash. Electronic Journal of Geotechnical Engineering, 16, (D), 2011 [online] http://www.ejge.com/2011/Ppr11.029/Ppr11.029.pdf (Accessed 7 January 2012).
• 6. KARUBE D., KAWAI K. The role of pore water in the mechanical behavior of unsaturated soils. Geotechnical and Geological Engineering, 19, 211, 2001.
• 7. GAO S., WANG J., ZHOU X. Solution of a rigid disk on saturated soil considering consolidation and rheology. Journal of Zhejiang University SCIENCE, 6A, (3), 222, 2005.
• 8. XIE K., XIE X., LI X. Analytical theory for one-dimensional consolidation of clayey soils exhibiting rheological characteristics under time-dependent loading. Int. J. Numer. Anal. Met., 32, (14), 1833, 2008.
• 9. TI K. S., HUAT B.B.K, NOORZAEI J., JAAFAR M.S., SEW G. S. A review of basic soil constitutive models for geotechnical application. Electronic Journal of Geotechnical Engineering, 14, (J), 2009 [online] http://www.ejge.com/2009/Ppr0985/Ppr0985ar.pdf (Accessed 14 June 2012).
• 10. LEWIS T. W., PIVONKA P., SMITH D. W. Theoretical investigation of the effects of consolidation on contaminant transport through clay barriers. Int. J. Numer. Anal. Met., 33, 95, 2009.
• 11. OLA S.A. Geotechnical properties of Nigerian black cotton soils.’ In Ola S.A. (Eds.), Tropical soils of Nigeria in engineering practice A.A. Balkerma, Rotterdam, pp. 85-101, 1983.
• 12. NARASIMHAN T. N. Darcy’s law and unsaturated flow. Vadose Zone Journal, 3, 1059, 2004.
• 13. FREDLUND D. G., RAHARDJO Soil Mechanics Principles for Highway Engineering in Arid Regions. Transportation Research Board, A2L06 Session, 1987.
• 14. NUTH M., LALOUI L. Effective stress concept in unsaturated soils: Clarification and validation of a unified framework. Int. J. Numer. Anal. Met., 32, 771, 2008.
• 15. KHALILI N., GEISER F., BLIGHT G.E. Effective stress in unsaturated soils: review with new evidence. International Journal of Geomechanics, 4, (2), 115, 2004.
• 16. LU L., LIKOS W. J. Suction stress characteristic curve for unsaturated soil. Journal of Geotechnical and Geoenvironmental Engineering, 132, (2), 131, 2006.
• 17. FREDLUND D. G. Unsaturated Soil Mechanics in Engineering Practice. Journal of Geotechnical and Geoenvironmental Engineering, 132, (3), 286, 2006.
• 18. OJURI O. O. Effect of soil suction on the compressibility and strength of North-Eastern Nigerian black cotton soil. Electronic Journal of Geotechnical Engineering, 17, (G), 2012. [online] http://www.ejge.com/2011/Ppr11.029/Ppr11.029.pdf (Accessed 5 May 2012).
• 19. NAGARAJ T. S., PANDIAN N. S., NARASIMHA RAJU P. S. R. Stress state – Permeability relationships for finegrained soils. Geotechnique, 43, (2), 333, 1993.
• 20. SIDDIQUE A., SAFIULLAH A. M. M. Permeability characteristics of reconstituted Dhaka clay. Journal of Civil Engineering Division the Institution of Engineers, Bangladesh, CE23, (1), 103, 1995.
• 21. HORPIBULSUK S., YANGSUKKASEAM N., CHINKULKIJNIWAT A., DU Y. J. Compressibility and permeability of Bangkok clay compared with kaolinite and bentonite. Appl. Clay Sci., 52, 150, 2011.
• 22. XU G., GAO Y., JI F., CAO Y. Permeability coefficients of dredged slurries at high void ratio. Applied Mechanics and Materials, 170-173, 1269, 2012.
• 23. WORLD HEALTH ORGANIZATION. Guideline for drinking water quality, Health Criteria and other information. 2nd Edition, WHO, Geneva. pp. 281-283, 1998.
• 24. NGSA. Geological map of Nigeria, from Nigerian Geological Survey Agency, Abuja, Nigeria, 2004.
• 25. OKUBO S., FUKUI K., GAO X. Rheological behaviour and model for porous rocks under air-dried and water-saturated conditions. The Open Civil Engineering Journal, Bentham Open, 1874-1495/08, 2, 88-98, 2008.