Sudden-expansion drop sill stilling basin suitable for high water head and large single-width discharge capacity

Abstract

The invention relates to a sudden-expansion drop sill stilling basin suitable for a high water head and a large single-width discharge capacity. The sudden-expansion drop sill stilling basin comprises a flip sill, a bottom drop sill, sudden expansions, side walls, a bottom plate and tail sills. The sudden-expansion drop sill stilling basin is arranged at the downstream of a spillway discharge chute; the bottom drop sill is arranged at the lower part of the flip sill; two sides of the bottom drop sill are connected with the lower parts of the side walls; the sudden expansions are connected to the upper parts of the two sides of the bottom drop sill and the middle parts and the upper parts of the side walls; the side walls are symmetrically arranged; the tail sills are arranged at the tail ends of the symmetrically arranged side walls, and the two sides of the tail sills are connected with the side edges of the tail ends of the side walls; the flip sill is provided with a certain depression angle. According to the sudden-expansion drop sill stilling basin suitable for the high water head and the large single-width discharge capacity, the hydraulic index near the bottom of the stilling basin can be remarkably reduced, the energy dissipation rate is increased, and the safety performance of a water drainage and energy dissipation building which is high in water head and large in single-width discharge capacity and has strict requirements for atomization can be improved.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and in particular relates to the technical field of structural parameters and a design method of a suddenly expanding sill stilling pool suitable for high water head, large unit and wide discharge capacity. Background technique [0002] In water conservancy and hydropower projects, the stilling pool is a commonly used energy dissipation device. Compared with surface flow and deflected flow energy dissipation, it has the characteristics of stable shape, good energy dissipation effect, and small atomization. However, due to the high mainstream flow velocity at the bottom, it is often necessary to line the riverbed within a certain length downstream and form a stilling basin to control the discharge water body and prevent destructive erosion, which requires a large amount of engineering. Generally, common stilling basins include down-dug stilling basins, sill-typ...

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Problems solved by technology

Due to the high velocity of flow into the pond and the high power of flood discharge, the energy dissipation of the large discharge volume and high water head may cause serious erosion to the flow surface of the stilling basin. The flow-induced vibration can lead to structural instability and foundation erosion

Generally speaking, the stilling basin can be prevented from being damaged by extending the length of the stilling basin, increasing the width of the stilling basin and the depth of the water cushion, and increasing the thickness of the concrete lining, but the above method increases the project investment

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