Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Abrasive damage of the concrete of the overflow dam of the ust'-Kamenogorsk hydroelectric station
Conclusions The presence of fragmental rock and deposits of coarse alluvium (gravel, pebbles) in the lower pool of an overflow dam can be the cause of abrasion of the concrete of the spillways and apron if, during discharge, conditions are created for the cyclic movement of abrasive material and its entry into the roller zone or other zones with a high turbulence, for example, whirlpool zones near piers, walls, etc. The intensity of the destructive process under especially unfavorable conditions can be quite high even with small specific discharges over the spillways.The movement of abrasive material toward places where it performs destructive work can be accomplished by bottom currents, occurring under certain conditions, which pass under the nappes of the spillways. The direction of these currents on the whole is opposite to the main flow, and their velocities are sufficient to transport coarse alluvium.Construction on the spillway of a deflector creating a hydraulic regime with a bottom roller in the lower pool can promote damage of the deflector concrete and of portions of the piers and apron adjacent to the deflector if during flow over the spillway the possibility of the entry of abrasive material (alluvium, construction trash) into the zone of the bottom roller is not eliminated.If the abrasive process is the determining factor in damaging the concrete surfaces of the spillways and apron, then the radical step of removal of the abrasive material is the only recourse, since just filling the caverns is ineffective.
Abrasive damage of the concrete of the overflow dam of the ust'-Kamenogorsk hydroelectric station
Conclusions The presence of fragmental rock and deposits of coarse alluvium (gravel, pebbles) in the lower pool of an overflow dam can be the cause of abrasion of the concrete of the spillways and apron if, during discharge, conditions are created for the cyclic movement of abrasive material and its entry into the roller zone or other zones with a high turbulence, for example, whirlpool zones near piers, walls, etc. The intensity of the destructive process under especially unfavorable conditions can be quite high even with small specific discharges over the spillways.The movement of abrasive material toward places where it performs destructive work can be accomplished by bottom currents, occurring under certain conditions, which pass under the nappes of the spillways. The direction of these currents on the whole is opposite to the main flow, and their velocities are sufficient to transport coarse alluvium.Construction on the spillway of a deflector creating a hydraulic regime with a bottom roller in the lower pool can promote damage of the deflector concrete and of portions of the piers and apron adjacent to the deflector if during flow over the spillway the possibility of the entry of abrasive material (alluvium, construction trash) into the zone of the bottom roller is not eliminated.If the abrasive process is the determining factor in damaging the concrete surfaces of the spillways and apron, then the radical step of removal of the abrasive material is the only recourse, since just filling the caverns is ineffective.
Abrasive damage of the concrete of the overflow dam of the ust'-Kamenogorsk hydroelectric station
Pavlenko, V. V. (Autor:in)
1974
Aufsatz (Zeitschrift)
Englisch
BKL:
56.30
Wasserbau
Lokalklassifikation TIB:
770/6550/8000
Abrasive damage of the concrete of the overflow dam of the ust'-Kamenogorsk hydroelectric station
| Springer Verlag | 1974