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    DisciplineGraduate College (420)Geosciences (135)Geology (58)Mining and Geological Engineering (30)Anthropology (10)Education (4)Renewable Natural Resources (4)Hydrology and Water Resources (3)Biological Sciences (2)Business Administration (2)View MoreAuthorsConey, Peter J. (4)Chase, Clement G. (3)Dickinson, William R. (3)Chaffee, Maurice A. (2)Coney, Peter (2)DeCelles, Peter G. (2)Erickson, Rolfe Craig, 1936- (2)Evensen, James Millard, 1931- (2)Ferris, J. G. (2)Gehrels, George E. (2)View MoreTypes
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    Geology of the Log Cabin area, near Questa molybdenum mine, Taos County, New Mexico

    Daniel, Herbert Ratnaraj, 1939- (The University of Arizona., 1967)
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    Geology and ore deposits of Las Guijas tungsten district, Pima County, Arizona

    Sheikh, Abdul Mannan, 1938- (The University of Arizona., 1966)
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    Stratigraphy of the red chert-pebble conglomerate in the Earp Formation, southeastern Arizona

    Rea, David Kenerson, 1942- (The University of Arizona., 1967)
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    Geology and ore deposits of the southern section of the Amole mining district, Tucson Mountains, Pima county, Arizona

    Kinnison, John Emmett, 1929- (The University of Arizona., 1958)
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    Geology and geochemistry of Proterozoic volcanic rocks bearing massive sulfide ore deposits, Bagdad, Arizona

    Robison, Lori Carol, 1955- (The University of Arizona., 1987)
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    Subsistence patterns of the Chumash Indians of southern Calfornia

    Landberg, Leif C. W. (The University of Arizona., 1963)
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    A programmed method for the computation of brine and solid phase reserves of evaporite lake deposits

    Winters, Harry Joseph, 1939- (The University of Arizona., 1967)
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    The geology of the Cuprite Mine area, Pima county, Arizona

    Browne, Jonathan Fiske, 1934- (The University of Arizona., 1958)
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    The stratigraphy of the Toroweap formation, Aubrey Cliffs, Coconino County, Arizona

    Belden, William Allen, 1925- (The University of Arizona., 1954)
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    LONG-TERM HIGHWALL STABILITY IN THE NORTHWESTERN POWDER RIVER BASIN, WYOMING AND MONTANA

    Smith, William K (The University of Arizona., 1980)
    Time-dependent behavior of natural and excavated slopes in sedimentary rocks is a subject that is poorly understood at present but that is now an important consideration in the design, operation, and reclamation of energy-extraction facilities, in part because of the environmental considerations mandated by the Surface Mining Control and Reclamation Act of 1977 (Public Law 95-87). A slide in an abandoned, unreclaimed strip mine northwest of Sheridan, Wyoming, has been analyzed as an example of a long-term slope failure in the region. This slide occurred in early 1975, some 20 years after cessation of mining. This investigation used Spencer's limiting equilibrium method and an elastic-plastic finite element method incorporating the Drucker-Prager yield criterion. This slide was found to fit the model for time-dependent failure proposed by Nelson and Thompson (1977) in which the time to failure is related to Skempton's residual factor. The Nelson-Thompson hypothesis is extended for use with the three-dimensional Drucker-Prager yield criterion. The residual factor (R) may be computed from the factors of safety with respect to peak (F(p)) and residual (Fᵣ) material properties, using either the Mohr-Coulomb or Drucker-Prager criterion, by the relationship R = [(F(p) - 1)/(F(p)-Fᵣ)] At the present time, the Spencer limiting equilibrium analysis is a more usable tool for ordinary slope design than the elastic-plastic finite element analysis because of the speed, simplicity, and ease of including the effects of ground water in the Spencer analysis.
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