A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Repair, Evaluation, Maintenance, and Rehabilitation Research Program: Geotechnical Aspects of Rock Erosion in Emergency Spillway Channels. Report 3. Remediation
Remediation of unlined emergency spillway erosion damage is a relatively new, but major, concern to the US ACE districts and to other dam owners and operators. Remediation design is highly site-specific and must be cost-effective, address public safety, and to 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 (composition, hardness, structural discontinuity, etc.), which determine 'rippability,' with lithostratigraphic continuity may allow for site-prioritization in terms of the need for remedial and preventive techniques. Potentially useful remedial 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, relief of uplift pressures, and placement of geotextiles and natural grasses (especially in poorly lithified rocks and soils) may also offer useful alternatives. (EDC)
Repair, Evaluation, Maintenance, and Rehabilitation Research Program: Geotechnical Aspects of Rock Erosion in Emergency Spillway Channels. Report 3. Remediation
Remediation of unlined emergency spillway erosion damage is a relatively new, but major, concern to the US ACE districts and to other dam owners and operators. Remediation design is highly site-specific and must be cost-effective, address public safety, and to 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 (composition, hardness, structural discontinuity, etc.), which determine 'rippability,' with lithostratigraphic continuity may allow for site-prioritization in terms of the need for remedial and preventive techniques. Potentially useful remedial 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, relief of uplift pressures, and placement of geotextiles and natural grasses (especially in poorly lithified rocks and soils) may also offer useful alternatives. (EDC)
Repair, Evaluation, Maintenance, and Rehabilitation Research Program: Geotechnical Aspects of Rock Erosion in Emergency Spillway Channels. Report 3. Remediation
C. P. Cameron (author) / D. M. Patrick (author) / C. O. Bartholomew (author) / A. W. Hatheway (author) / J. H. May (author)
1988
67 pages
Report
No indication
English
Civil Engineering , Geology & Geophysics , Soil & Rock Mechanics , Erosion , Rock mechanics , Spillways , Barriers , Bolts , Cements , Channels(Waterways) , Concrete , Damage , Discontinuities , Dissipation , Emergencies , Water flow , Grasses , High strength , Indexes , Mass , Mesh , Parameters , Precursors , Prevention , Probability , Public safety , Rehabilitation , Reinforced concrete , Removal , Repair , Reservoirs , Rock , Shotcrete , Soils , Stratigraphy , Structural geology , Engineering geology , Vegetation , Wire , Hardness , Lithology , Grout , Routing , Rock erosion , Geotextiles , Rippability , Gabions , Riprap
Rock erosion in spillway channels - A case study of the Ligga spillway
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