Investigations of Blocks in Foundations and Abutments of Concrete Dams
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 129, Issue 2
Abstract
This paper discusses investigations of potential block hazards in ten existing American concrete arch and buttress dams. Block theory was used to identify and describe all removable blocks, based on the study of construction photos and logs, and new mapping, often done on steep valley sides. Water forces on the block faces were calculated for stability analysis using a map of the phreatic surface or an estimated flow regime along the subsurface boundary of the block. In some cases, block hazards were shown to be nonexistent because there were no real intersections of significant discontinuities of sufficient extent to cut out a block, or there was no kinematically possible mode of failure with the prevailing force system. Several dams had blocks that were removable but judged sufficiently safe with the applicable friction angles. Three structures demanded attention: A spillway structure was armored to prevent further erosion that diminished the resistance of a key block in its foundation; a dome and buttress structure received a reinforced concrete buttress to add passive support against a block critically located in the abutment; and a drainage adit and deep drains drilled from the surface and from the adit were constructed to raise the safety factor of a large block beneath the abutment of an arch dam.
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References
Barton, N., and Choubey, V.(1977). “The shear strength of joints in theory and practice.” Rock Mech., 10, 1–54.
Casagrande, A. C.(1961). “First Rankine lecture, control of seepage through foundations and abutments of dams.” Geotechnique, XI(3), 161–182.
Goodman, R. E. (1989). Introduction to rock mechanics, 2nd Ed., Wiley, New York.
Goodman, R. E.(1995). “The 35th Rankine lecture: Block theory and its application.” Geotechnique, 45(3), 383–423.
Goodman, R. E., and Kieffer, S.(2000). “Behavior of rock in slopes.” J. Geotech. Geoenviron. Eng., 126(8), 675–684.
Goodman, R. E., and Scott, G. A. (1994). “Rock mechanics dam safety studies for Seminoe arch dam.” Proc., 1st North America Rock Mechanics Symposium, Balkema, Rotterdam, The Netherlands, 1051–1058.
Goodman, R. E., and Shi, G. H. (1985). Block theory and its application to rock engineering, Prentice-Hall, Englewood Cliffs, N.J.
Kottenstette, J. T.(1997). “Block theory techniques used in arch dam foundation stability analysis.” Int. J. Rock Mech. Min. Sci., 34, 3–4.
Londe, P.(1987). “The Malpasset Dam failure.” Eng. Geol. (Amsterdam), 24, 295–329.
Londe, P., Vigier, G., and Vormeringer, R.(1969). “Stability of rock slopes, a three dimensional study.” J. Soil Mech. Found. Div. Am. Soc. Civ. Eng., 95(SM1), 235–262.
Londe, P., Vigier, G., and Vormeringer, R.(1970). “Stability of rock slopes, graphical methods.” J. Soil Mech. Found. Div. Am. Soc. Civ. Eng., 96(SM4), 1411–1434.
Mauldon, M., and Goodman, R. E.(1996). “Vector analysis of key block rotations.” J. Geotech. Geoenviron. Eng., 122(12), 976–987.
Powell, C., and Pearson, R.(1993). “Coolidge dam abutment stability and stabilization.” Geotechnical Practice in Dam Rehabilitation, Geotechnical Special Pub. No., 35, 834–849.
Scott, G. A. (1990). “Deformation of rock foundations under dams.” Dam foundation engineering tenth annual USCOLD lecture, U.S. Committee on Large Dams, New Orleans.
Scott, G. A.(1997). “Foundation studies for Theodore Roosevelt Dam.” Int. J. Rock Mech. Min. Sci., 34, 3–4.
Scott, G. A. (1999). Guidelines-Foundation and geotechnical studies for existing concrete dams, USBR Technical Service Center, Denver.
Wittke, W. (1984). Rock mechanics, Springer, Vienna, Austria.
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Copyright © 2003 American Society of Civil Engineers.
History
Received: Jul 13, 2001
Accepted: Jun 10, 2002
Published online: Jan 15, 2003
Published in print: Feb 2003
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