Capping method for planar curve path of free-flow spillway tunnel

A technology for flood discharge tunnels and open flow, which is applied in water conservancy projects, sea area projects, coastline protection, etc. It can solve the problems affecting the discharge of the downstream straight section and the poor flow state of the bend, so as to save investment, reduce the amount of engineering, and well-designed effects

Inactive Publication Date: 2010-10-27
SICHUAN UNIV
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Problems solved by technology

The top pressure technology adopted in this method solves the problem of poor water flow in the plane bend of the open flow flood discharge tunnel and affects the discharge of the downstream straight section

Method used

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  • Capping method for planar curve path of free-flow spillway tunnel

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Embodiment

[0022] The roofing method of the plane curve of the open flow flood discharge tunnel of the present invention is used in the Taiji Reservoir Project, and the actual technical parameters used are as follows:

[0023] 1. The width of the open flow flood discharge tunnel is B=5.00m, the turning radius of the plane curve is R=50.00m, the turning angle of the plane curve is θ=51.16°, and the depth of the first water in front of the plane curve is H max =3.00m, margin of cave roof ΔH=2.50m, such as figure 1 (B) As shown in Figure 1-1;

[0024] 2. The maximum discharge flow Q of the open flow flood discharge tunnel max 410.00m 3 / s, calculate the average flow velocity v=Q of the section before the plane bend max / (H max B)=410 / (3×5)=27.33m / s, according to the Froude number F r the definition of The ratio of the width B of the open flow flood discharge tunnel to the turning radius R of the plane curve B / R=5.00 / 50.00=0.10;

[0025] 3. The ratio of the width B of the open flow f...

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Abstract

The invention relates to a capping method for planar curve paths of a free-flow spillway tunnel, belonging to the technical field of hydraulic engineering. The method utilizes a capping technology for the planar curve path of a free-flow spillway tunnel to reduce the roof height, and comprises the following steps: firstly calculating the Froude number before the planar curve path when the free-flow spillway tunnel has maximum discharge flow; then determining the copping efficient according to the ratio of the width of the free-flow spillway tunnel to the turning radius of the planer curve path, the Froude number and the corner parameter of the planer curve path; and finally back calculating the residual amplitude of tunnel ceiling according to a defined copping coefficient. The residual amplitude of capping is required to be less than that of the tunnel roof before the planar curve path when the free-flow spillway tunnel has maximum discharge flow. In order to ensure that the flow of water at straight segments after copping outlet is stable, the extending length of the copping segment extending to the straight segments is designed to be 2-4 times of the width of the free-flow spillway tunnel. After the planar curve path of the free-flow spillway tunnel is copped, concave-bank water constrain restricted by copping is controlled to below the copping, to avoid negative and rolling flow state caused by the way that current flings the arc tunnel ceiling, thereby ensuring stable current of the downstream straight segments and realizing safe flood discharge.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering, in particular to a roofing method for a planar curve of an open flow flood discharge tunnel using the roofing technology. Background technique [0002] Using the diversion tunnel to transform it into a "dragon raising its head" type open flow flood discharge tunnel can save engineering investment, and it is currently the most widely used layout type in water conservancy projects. Its main features are: first, the working gate is arranged at the water inlet of the open flow flood discharge tunnel, which is convenient for centralized management; secondly, the water flow pattern of the open flow flood discharge tunnel is clear; and the engineering volume is relatively small. Since the water inlet of the open flow flood discharge tunnel is set at a high elevation, the water head acting on the working gate of the water inlet is small, thereby reducing the technical difficulty in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B8/06
Inventor 陈云良王波伍超
Owner SICHUAN UNIV
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