Charles D. Shackelford

Professional Engineer (California, Colorado)

Department of Civil Engineering
Colorado State University
Fort Collins CO 80523-1372
Phone (970) 491-5051
Fax     (970) 491-3584

B.S. (Civil Engineering, 1980), University of Missouri at Rolla

M.S. (Geotechnical Engineering, 1983), University of Texas at Austin

Ph. D. (Geoenvironmental Engineering, 1988), University of Texas at Austin


Professor Shackelford has 16 years of experience pertaining to geoenvironmental engineering for waste containment and environmental remediation, is a registered professional Civil Engineer in California and Colorado, and has served as an expert on waste disposal and geoenvironmental issues on several occasions for private companies and federal agencies. Professor Shackelford’s research is focused on evaluating flow and transport of hazardous liquids and contaminants through soil and geosynthetic containment barriers, such as compacted clay liners and geosynthetic clay liners, commonly used in waste disposal (landfills) applications, as well as through vertical (soil) cutoff walls used for in situ containment and remediation of polluted sites. He also currently serves as the Director of the Rocky Mountain Regional Hazardous Substance Research Center (, a $4.0-million, 5-year Center focused on remediation of mine waste sites and funded through the U.S. EPA.

Dr. Shackelford's most significant contributions have related to characterizing diffusion of potential contaminants through these barrier materials. His current research efforts are focused on evaluating the significance of membrane behavior and coupled processes on contaminant transport through clay soils, and in determining the long-term (2-3+ year) performance of geosynthetic clay liners exposed to hazardous chemical solutions. The majority of his research has been funded by the National Science Foundation, and he received the NSF National Young Investigator Award in 1992.  In 1995, his research contributions pertaining to the role of diffusion in containment barrier design also were acknowledged with the receipt of the Walter L. Huber Civil Engineering Research Prize from the American Society of Civil Engineers. Professor Shackelford has given 43 invited presentations in the US and 12 other countries (Australia, Argentina, Brazil, Canada, Chile, England, France, Germany, Italy, Japan, Scotland, and Wales).  Dr. Shackelford currently serves as an Editor for the ASCE Journal of Geotechnical and Geoenvironmental Engineering, and the Journal of Hazardous Materials published by Elsevier, Amsterdam. He also was past chair and is a current member of the Environmental Geotechnics Committee of ASCE's Geo-Institute, is co-chair for the Environmental Geotechnics Committee TC5 of ISSMGE, serves on the Technical Coordination Council (TCC) of ASCE's Geo-Institute, and is an elected Board member of the U. S. University Council on Geotechnical Engineering Research (USUCGER).


List of Recent Publications


Shackelford, C. D. and Lee, J.-M. (2003). The destructive role of diffusion on clay membrane behavior. Clays and Clay Minerals, 51(2), 187-197.


Malusis, M. A., Shackelford, C. D., and Olsen, H. W. (2003). Flow and transport through clay membrane barriers. Engineering Geology, Elsevier, Amsterdam, in press.


Malusis, M.A. and Shackelford, C.D. (2002). Theory for reactive solute transport through clay membrane barriers. Journal of Contaminant Hydrology, Elsevier, Amsterdam, 59(3-4), 291-316.


Malusis, M.A. and Shackelford, C.D. (2002). Coupling effects during steady-state solute diffusion through a semipermeable clay membrane. Environmental Science and Technology, ACS, 36(6), 1312-1319.


Malusis, M.A. and Shackelford, C.D. (2002). Chemico-osmotic efficiency of a geosynthetic clay liner. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 128(2), 97-106.


Shackelford, C.D. (2002). Geoenvironmental Engineering. Encyclopedia of Physical Science and Technology, Third Edition, Academic Press, San Diego, Vol. 6, 601-621.


Munoz, J.F., Suazo, A., Rengifo, P., Shackelford, C.D., and Vauclin, M. (2001). In-situ acid leaching of copper tailings: A case history. The Canadian Mining and Metallurgical Bulletin, 94(1056), 81-87.


Burger, C. A. and Shackelford, C. D. (2001). Soil-water characteristic curves and dual porosity of sand-diatomaceous earth mixtures. Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 127(9), 790-800.


Malusis, M. A., Shackelford, C. D., and Olsen, H. W. (2001).  A laboratory apparatus to measure chemico-osmotic efficiency coefficients for clay soils. Geotechnical Testing Journal, ASTM, 24(3), 229-242.


Burger, C. A. and Shackelford, C. D. (2001). Evaluating dual porosity of pelletized diatomaceous earth using bimodal soil water characteristic curve functions, Canadian Geotechnical Journal, CGS-NRC, 38(1), 53-66.


Chiu, T.-F. and Shackelford, C. D. (2000). Laboratory evaluation of sand underdrains, Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 126(11), 990-1001.


Shackelford, C. D. and Jefferis, S. A. (2000). Geoenvironmental engineering for in situ remediation, International Conference on Geotechnical and Geoenvironmental Engineering (GeoEng2000), Melbourne, Australia, Nov. 19-24, Technomic Publ. Co., Inc., Lancaster, PA, Vol. 1, 121-185.


Shackelford, C. D, Benson, C. H., Katsumi, T., Edil, T. B., and Lin, L. (2000). Evaluating the hydraulic conductivity of GCLs permeated with non-standard liquids, Geotextiles and Geomembranes, Elsevier, Amsterdam, 18(2-4), 133-161.


Shackelford, C. D. (1999). Remediation of contaminated land: An overview, Proceedings, XI Pan-American Conference on Soil Mechanics and Geotechnical Engineering, Iguasu Falls, Brazil, Aug. 8-13, Vol. 4, 371-430.


Shackelford, C. D. (1999). Reactive nature of passive containment barriers, Discussion 6.1, Proceedings, 14th International Conference on Soil Mechanics and Foundation Engineering, Hamburg, Germany, Sept. 6-12, 1997, Balkema, Rotterdam, Vol. 4, 2535-2536.


Shackelford, C. D., Malusis, M. A., Majeski, M. J., Stern, R. T. (1999). Electrical conductivity breakthrough curves, Journal of Geotechnical and Geoenvironmental Engineering, ASCE , 125(4), 260-270.