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- W587420764 abstract "REMR research at the U.S. Army Engineer Waterways Experiment Station has established that remediation of unlined emergency spillway erosion damage is a relatively new, but major, concern to the U.S. Army Corps of Engineers Districts and to other dam owners and operators. The REMR work unit conducting the current investigation has identified numerous dams that have experienced erosion damage in their unlined spillway channels. However, only a few projects have implemented or planned remedial and/or preventive measures. Remediation design is highly site-specific and must be cost-effective, address public safety, and provide continued reservoir operations. Selection of remedial technique(s) must be established by site-specific characterization of the rocks forming an unlined spillway channel in terms of rock composition(s), hardness, structural and stratigraphic discontinuities, and precursor erosion elements, all of which determine rock erodibility and its rate. Erosion probability indices based on methods which combine rock mass parameters, which determine rippability, with lithostratigraphic continuity may allow for site-prioritization in terms of the need for remedial and preventive techniques. Potentially useful remedial engineering techniques include cement-based methods such as grouting, shotcrete, soil cement/roll crete, and high-strength unreinforced and reinforced concrete, as well as rock bolts, wire mesh, gabions, and riprap. Potentially useful erosion preventive measures include construction of energy dissipators and cut-off walls and the removal of vegetation and other obstacles to flow. Flow rerouting, the relief of uplift pressures, and the placement of geotextiles and natural grasses (especially in poorly lithified rocks and soils) may also offer useful alternatives. The majority of these remedial techniques have been utilized previously in various erosion protection schemes (e.g., stream banks, canals, levees, etc.); however, their use in unlined emergency spillway channels has not been extensive and there is little documentation available." @default.
- W587420764 created "2016-06-24" @default.
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- W587420764 date "1988-09-01" @default.
- W587420764 modified "2023-09-26" @default.
- W587420764 title "GEOTECHNICAL ASPECTS OF ROCK EROSION IN EMERGENCY SPILLWAY CHANNELS. REPORT 3. REMEDIATION" @default.
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