Water-sand separation structures suitable for straight-line steep channel spillways

Abstract

The invention discloses a water-sand separation building applicable to a linear chute spillway. The water-sand separation building mainly comprises a sand collection pool of which the upstream end is connected with an incoming flow spillway, and a flow pass channel and a sand discharge channel which are positioned at the downstream part of the sand collection pool and are arranged side by side, wherein an inlet of the sand discharge channel is in smooth connection with the sand collection pool; the flow pass channel is connected with the sand collection pool through an overflow weir; the water attaining surface of the overflow weir is an circular arc surface, and forms a sand guide wall used for introducing large-particle and granular sediment in a water current into the sand discharge channel; the upstream end of the circular arc surface of the sand guide wall is connected with the side wall on the outer side of the flow pass channel; the downstream end of the circular arc surface of the sand guide wall is connected with a separation side wall of the flow pass channel and the sand discharge channel; and the pool bottom of the sand collection pool in front of the sand guide wall has a gradient inclined to the inlet of the sand discharge channel. Through the adoption of the water-sand separation building, the large-particle and granular sediment in a high-sand content water current in a chute can be separated from the water current relatively well, the sediment which has relatively large harm to the chute spillway is discharged from the special sand discharge channel, and the purposes that the protection range is decreased and the safety of project operation is improved are achieved.

Description

technical field [0001] The invention relates to a sand discharge technology in water conservancy and hydropower projects and disaster prevention and reduction projects, in particular to a water and sand separation structure suitable for spillways in linear steep grooves. Background technique [0002] In water conservancy and hydropower projects or disaster prevention and mitigation projects, the drainage facilities of hydraulic structures such as slag yards, retaining dams, tailings ponds, etc. usually use steep groove spillways. In addition to flood discharge during flood seasons, the steep groove spillway also has the function of sand discharge effect. Because the sediment involved in this type of retaining structure has the characteristics of wide particle size gradation, large particle size and large particle content. Studies have shown that in similar steep channel spillways, a large amount of coarse-grained sediment and granular bodies carried by high-speed water flow...

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Problems solved by technology

[0004] However, all the above-mentioned grit chambers are aimed at the suspended and fine particles in the water flow, and their design is mainly based on the principle of water and sand separation such as spiral flow in bends, sand settling and regular sand discharge at the bottom, and such buildings The probability of large particles and granular bodies appearing in the medium is relatively small

However, there are relatively few water-sediment separation measures for the sediment-laden flow containing large particles and loose-grained sediment in the spillway of the steep channel

However, in actual engineering, there are many examples of damage to the overflow boundary of steep channel spillways caused by high-speed, high-sediment flow containing large particles and granular sediment, and many similar projects require regular post-flood repairs

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