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Consideration on Hydraulic Running Parameters of Hydrotechnical Free Flow Culverts

Author(s): Mihail M. Luca; Vasile Hobjila

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Keywords: Hydrotehnical culverts; Free flow; Water dynamic action; Erosion phenomenon; Cavitation phenomenon

Abstract: The paper concerns the hydraulic study of hydrotechnical free flow culverts functioning with variable discharge and warp load. An analysis is made on the concrete case of culvert of a mountainous stream under a mining warehouse mass over its course. The hydrotechnical culvert made of steel concrete, with a circular shape and 1. 80m diameter. The total length of the culvert is of 1368 m. After a free running of 22 years the hydrotechnical culvert has been seriously eroded in the apron area. The destructive process is the result of water dynamic action loaded with solid particles, in a free and fast flow and of cavitation phenomenon moulded on the damaged apron of the culvert in a nonuniform way. The formation of high speed can lead to the appearance and maintenance of the cavitation phenomenon. The erosion and cavitation phenomena operate on the flow section independently or together. The correlation of the two water erosion phenomena in their action destroys the safety of the hydrotechnical culvert running.


Year: 1999

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