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Download Guidebook as .pdf (2.2 Mb) - Carolina Geological Society

Download Guidebook as .pdf (2.2 Mb) - Carolina Geological Society Download Guidebook as .pdf (2.2 Mb) - Carolina Geological Society

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______________________________________________________________________________________ 2008 annual meeting – Spruce Pine Mining District: Little Switzerland, North Carolina ______________________________________________________________________________________ undercut by the cut slope. Brittle features like fractures form the back and lateral release surfaces allowing the rock block to detach from the rock mass. In this case, accelerated weathering enhanced the permeability of the of the sulfidic, graphitic schist layer surface contributing to excess pore-water pressure that probably triggered the rock slide. Acknowledgements. Funding for the geologic inventory of the North Carolina segment of the Blue Ridge Parkway was provided in part by the National Park Service. The Asheville Geotechnical Unit of the N.C. Department of Transportation is gratefully acknowledged for providing essential technical support by conducting the net neutralization potential testing. Tom Collins with the U.S. Forest Service provided much useful information on landslides affecting National Forests in North Carolina, and many thought-provoking discussions on landslide hazard mapping and loss prevention. References: Bogucki, D.J., 1976, Debris slides in the Mt. LeConte area, Great Smoky Mountains National Park, U.S.A: Geografiska Annaler, vol. 58A, p. 179-191. Bryant, L., Mauldon, M., and Mitchell, J.K., 2003, Geotechnical problems with pyritic rock and soil: Center for Geotechnical Practice and Research, Virginia Polytechnic Institute and State University, Blacksburg, Va., 88 p. Clark, G.M., and Ryan, P.T., 1987, Debris slides and debris flows on Anakeesta Ridge, Great Smoky Mountains National Park, Tennessee: U.S. Geological Survey Circular 1008, p. 18-19. Collins, T.K., 2007, Debris flows caused by failure of fill slopes: early detection, warning, and loss prevention, Landslides v.5 n.1, pp.107-120 Douglas, T.J., Wooten, R.M., Gillon, K.A., Bauer, J.B., Kuhne, J.C., Latham, R.S., Witt, A.C., Fuemmeler, S.J., 2007, Geohazard and Transportation Aspects of Sulfidic Rock (Acid Rock) in North Carolina, 7 th Annual Technical Forum on Geohazards in Transportation in the Appalachian Region, Asheville, NC, August 1-2, 2007. Latham, R.S., and Wooten, R.M., 2005, Stop 1-1 Plane and wedge rock failure modes in the Ashe-Tallulah Falls Formation at Caney Fork overlook, In: Hatcher, R.D., and Merschat, A.J., eds., Blue Ridge Geology Geotraverse east of the Great Smoky Mountain National Park, western North Carolina, Carolina Geological Society Fieldtrip Guidebook, November 5-6, 2005, p.114-116. Schaeffer, M.F., and Clawson, P.A., 1996, Identification and treatment of potential acid-producing rocks and water quality monitoring along a transmission line in the Blue Ridge Province, southwestern North Carolina: Environmental & Engineering Geoscience, v. II, no. 1, Spring 1996, p. 35-48. Watts, C.F., Gillam, D.R., Hrovatic, M.D., and Hong, H., 2003, User’s manual Rockpack III for Windows (ROCK slope stability computerized analysis PACKage), C.F. Watts and Assoc., 48p. Williamson, D.A, 1984, Unified rock classification system: Bulletin of the Association of Engineering Geologists, vol. XXI, p. 253-254. ______________________________________________________________________________________ Page 65 ______________________________________________________________________________________

______________________________________________________________________________________ 2008 annual meeting – Spruce Pine Mining District: Little Switzerland, North Carolina ______________________________________________________________________________________ Wooten R.M. and Latham R.S., 2004, Report on the May 5-7, 2003 debris flows on slopes underlain by sulfidic bedrock of the Wehutty, Nantahala, and Copper Hill Formations, Swain County, North Carolina, North Carolina Geological Survey unpublished report of investigation, 20p. Figure 1. Photograph of the July 15, 1999 rockslide blocking the Blue Ridge Parkway. Photograph courtesy of Alexander Glover, Active Minerals Inc. ______________________________________________________________________________________ Page 66 ______________________________________________________________________________________

______________________________________________________________________________________<br />

2008 annual meeting – Spruce Pine Mining District: Little Switzerland, North <strong>Carolina</strong><br />

______________________________________________________________________________________<br />

Wooten R.M. and Latham R.S., 2004, Report on the May 5-7, 2003 debris flows on slopes underlain by<br />

sulfidic bedrock of the Wehutty, Nantahala, and Copper Hill Formations, Swain County, North <strong>Carolina</strong>,<br />

North <strong>Carolina</strong> <strong>Geological</strong> Survey unpublished report of investigation, 20p.<br />

Figure 1. Photograph of the July 15, 1999 rockslide blocking the Blue Ridge Parkway. Photograph<br />

courtesy of Alexander Glover, Active Minerals Inc.<br />

______________________________________________________________________________________<br />

Page 66<br />

______________________________________________________________________________________

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