Slope erosion-preventing water cushion pond structure

Abstract

The application discloses a water cushion pond structure for preventing impact on a side slope, which is provided with a horse path, water cushion pond side slopes, a water cushion pond bottom plate and an excavation impact area. A plurality of horse paths and a plurality of water cushion pond side slopes are alternately connected in sequence, and the water cushion pond bottom plate is located between the lowermost water cushion pond side slopes. The excavation impact area is formed at a specified and preset position of the horse path, the water cushion pond side slopes and the water cushion pond bottom plate, the excavation impact area is cut off from the horse path and the water cushion pond side slopes, and the bottom of the excavation impact area is connected with the water cushion pond bottom plate. The falling point area of the pick-up water tongue is located in the excavation impact area, and the excavation impact area is used for receiving the pick-up water tongue formed when the dam body surface hole picks up and discharges flood. The application can ensure that the water cushion pond side slopes and the horse path are not impacted while the engineering quantity is not greatly increased, thereby enhancing the structural stability of the whole water cushion pond and effectively increasing the energy dissipation rate of the pick-up water body.

Description

Technical Field

[0001] This invention relates to a water cushion pond structure for slope erosion control, belonging to the field of energy dissipation and erosion control technology in water conservancy and hydropower engineering. Background Technology

[0002] Arch dams are a very common type of dam in water conservancy and hydropower projects. They are generally built in narrow river valleys and are characterized by high head, large flow, and narrow valleys, resulting in relatively large unit width discharge and unit width flood discharge capacity. In addition, the complex geological conditions of the river valley in the dam area make the flood discharge, energy dissipation, and scour prevention problems of high arch dams more prominent, which has become one of the key technical challenges in the construction of high arch dams.

[0003] Currently, when using surface spillways for flood discharge in arch dams, the multiple spillway outlets are typically arranged symmetrically on both sides of the centerline of the stilling basin's bottom slab. For ease of maintenance, the downstream stilling basin slope is generally not a straight slope down to the bottom; instead, a walkway of a certain width is constructed at different elevations along the slope. Especially in engineering practice, to reduce the excavation volume and construction scale of the stilling basin, the width of the basin's bottom slab is usually made smaller than the width of the water jet. This causes some of the water jet to directly impact the stilling basin slope and even the walkway, which has a very detrimental effect on the structural stability of the stilling basin. However, widening the stilling basin slope to both sides so that the water jet impact point is entirely within the bottom slab area would significantly increase the workload and cost. Therefore, ensuring that the stilling basin slope and walkway are not impacted without significantly increasing the workload is a problem that urgently needs to be solved. Summary of the Invention

[0004] In view of the above-mentioned shortcomings in the existing technology, the purpose of this invention is to provide a water cushion pond structure for slope erosion prevention, which solves the problem of poor structural stability of water cushion ponds caused by water jet impact without significantly increasing the amount of engineering work.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a water cushion pond structure for slope erosion prevention, used for flood discharge from the surface opening of the arch dam, wherein a water jet is formed when the surface opening of the dam discharges floodwater; the water cushion pond structure includes a walkway, a water cushion pond slope, a water cushion pond bottom plate and an excavation impact zone.

[0006] The horse trails and the water cushion pond slopes are alternately connected in sequence, with the bottom plate of the water cushion pond located between the lowest water cushion pond slopes;

[0007] The excavation impact zone is formed at a designated preset location on the walkway, the slope of the water cushion pond, and the bottom plate of the water cushion pond. The excavation impact zone cuts off the walkway and the slope of the water cushion pond, and the bottom of the excavation impact zone intersects with the bottom plate of the water cushion pond.

[0008] The landing area of ​​the jetting water is located in the excavation impact zone, which is used to receive the jetting water formed when the dam surface outlet discharges floodwater.

[0009] As a preferred structural design for a water cushion pond for slope erosion control, the width of the jetting water tongue is smaller than the width of the excavation impact zone; the slope of the excavation impact zone is a straight slope.

[0010] As a preferred structural design for a water cushion pond for slope erosion control, the width of the jetting water tongue is smaller than the width of the excavation impact zone; the slope of the excavation impact zone is a sloping slope.

[0011] As a preferred structural design for a water cushion pond for slope erosion control, the width of the excavated impact zone and the width of the water jet entry point have the following relationship:

[0012] B = (1.3 ~ 1.5)b

[0013] In the formula, B is the width of the excavation impact zone, and b is the width of the water jet entry point.

[0014] As a preferred structural design for a water cushion pond for slope erosion control, the thickness W of the excavated impact zone along the flow direction of the jetting water tongue has the following relationship:

[0015] W = (1.2 ~ 1.5)R

[0016] In the formula, R represents the thickness of the water jet at the water inlet position along the water flow direction.

[0017] As a preferred structural design for a water cushion pond for slope erosion control, the excavation impact zone is formed in the area where the jet of water lands on the walkway, the slope of the water cushion pond, and the bottom plate of the water cushion pond.

[0018] The beneficial effects of this invention are as follows: it includes a walkway, a stilling basin slope, a stilling basin bottom slab, and an excavation impact zone; several walkways and several stilling basin slopes are alternately connected in sequence, with the stilling basin bottom slab located between the lowest stilling basin slopes; the excavation impact zone is formed at designated preset positions on the walkways, stilling basin slopes, and stilling basin bottom slab, cutting off the walkways and stilling basin slopes, with its bottom intersecting with the stilling basin bottom slab; the landing area of ​​the spillway water jet is located in the excavation impact zone, which is used to receive the spillway water jet formed during the dam's surface outlet for flood discharge. This invention can ensure that the stilling basin slope and walkway are not impacted without significantly increasing the amount of engineering work, thereby enhancing the structural stability of the entire stilling basin and effectively increasing the energy dissipation rate of the spillway water. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0021] Figure 1 A three-dimensional schematic diagram of a water cushion pond structure for slope erosion prevention provided in an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the dimensional relationships of the slope erosion prevention water cushion pond structure provided in an embodiment of the present invention from a top view angle;

[0023] Figure 3 This is a schematic diagram of the flow regime of a water cushion pond structure for slope erosion prevention provided in an embodiment of the present invention.

[0024] In the diagram, 1. Surface opening of the dam body; 2. Water jet; 3. Walkway; 4. Side slope of the cushion pond; 5. Bottom slab of the cushion pond; 6. Excavation impact zone. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0027] See Figure 1 , Figure 2 and Figure 3This invention provides a water cushion pond structure for slope erosion prevention, used for the dam body surface orifice 1 for flood discharge. When the dam body surface orifice 1 discharges floodwater, a water jet 2 is formed. The water cushion pond structure includes a walkway 3, a water cushion pond slope 4, a water cushion pond bottom slab 5, and an excavation impact zone 6.

[0028] Among them, several horse trails 3 and several water cushion pond slopes 4 are alternately connected, and the bottom plate of the water cushion pond 5 is located between the lowest water cushion pond slopes 4.

[0029] Among them, the excavation impact zone 6 is formed at the designated preset position of the walkway 3, the water cushion pond slope 4 and the water cushion pond bottom plate 5. The excavation impact zone 6 cuts off the walkway 3 and the water cushion pond slope 4, and the bottom of the excavation impact zone 6 intersects with the water cushion pond bottom plate 5.

[0030] Among them, the landing area of ​​the jet 2 is located in the excavation impact zone 6, which is used to receive the jet 2 formed when the dam surface orifice 1 discharges floodwater.

[0031] In this embodiment, the width of the jetting water tongue 2 is less than the width of the excavation impact zone 6; the slope of the excavation impact zone 6 is a straight slope, or it can be a sloping slope. The excavation impact zone 6 is formed in the area where the jetting water tongue 2 lands on the walkway 3, the slope of the water cushion pond 4, and the bottom plate of the water cushion pond 5. By excavating the slope of the area where the water tongue lands to both sides to be slightly wider than the width of the jetting water tongue, the excavated slope can be set as a straight slope or a sloping slope, while the other areas where the water tongue lands can maintain their original width or even be appropriately narrowed, thereby reducing the amount of work.

[0032] Support Figure 2 and Figure 3 In this embodiment, the width of the excavation impact zone 6 and the width of the water jet 2 at its entry point are related as follows: B = (1.3~1.5)b; where B is the width of the excavation impact zone 6 and b is the width of the water jet 2 at its entry point. The thickness W of the excavation impact zone 6 along the flow direction of the water jet 2 is related as follows: W = (1.2~1.5)R; where R represents the thickness of the water jet 2 at its entry point along the flow direction. Because the water cushion pond in the water jet impact zone is expanded to both sides, the energy dissipation water volume is further increased, and the water can form vortices in the excavation impact zone 6, thereby effectively increasing the energy dissipation rate of the water jet.

[0033] In summary, this invention comprises a walkway 3, a cushion pond slope 4, a cushion pond bottom slab 5, and an excavation impact zone 6. Several walkways 3 and several cushion pond slopes 4 are alternately connected, with the cushion pond bottom slab 5 located between the lowest cushion pond slopes 4. The excavation impact zone 6 is formed at a designated preset position on the walkway 3, cushion pond slope 4, and cushion pond bottom slab 5, cutting off the walkway 3 and cushion pond slope 4. The bottom of the excavation impact zone 6 intersects with the cushion pond bottom slab 5. The landing area of ​​the jetting water tongue 2 is located in the excavation impact zone 6, which is used to receive the jetting water tongue 2 formed when the dam surface orifice 1 discharges floodwater. By excavating the slope of the landing area of ​​the cushion pond jetting water tongue to both sides to a width slightly wider than the jetting water tongue, the excavated slope can be set as a straight slope or a sloping slope, while other areas of the jetting water tongue landing point can maintain their original width or even be appropriately narrowed, thereby reducing the amount of engineering work. As the water cushion pond in the water tongue impact zone is expanded to both sides, the energy dissipation water volume is further increased, and the water body can form vortex in the excavation impact zone 6, thereby effectively increasing the energy dissipation rate of the jet water body.

[0034] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A slope erosion control water cushion pond structure for flood discharge from the surface opening (1) of an arch dam, wherein a water jet (2) is formed during flood discharge from the surface opening (1), characterized in that, The structure of the cushion pond includes a walkway (3), a cushion pond slope (4), a cushion pond bottom slab (5), and an excavation impact zone (6); The horse trails (3) and the water cushion pond slopes (4) are alternately connected in sequence, and the bottom plate (5) of the water cushion pond is located between the lowest water cushion pond slopes (4); The excavation impact zone (6) is formed at a designated preset position on the horse path (3), the water cushion pond slope (4) and the water cushion pond bottom plate (5). The excavation impact zone (6) cuts off the horse path (3) and the water cushion pond slope (4). The bottom of the excavation impact zone (6) and the water cushion pond bottom plate (5) intersect. The landing area of ​​the jetting water tongue (2) is located in the excavation impact zone (6), which is used to receive the jetting water tongue (2) formed when the dam surface orifice (1) discharges floodwater.

2. The slope erosion control water cushion pond structure according to claim 1, characterized in that, The width of the jet stream (2) is smaller than the width of the excavation impact zone (6); the slope of the excavation impact zone (6) is a straight slope.

3. The slope erosion control water cushion pond structure according to claim 1, characterized in that, The width of the jet stream (2) is smaller than the width of the excavation impact zone (6); the slope of the excavation impact zone (6) is a slope.

4. A slope erosion control water cushion pond structure according to claim 2 or 3, characterized in that, The width of the excavation impact zone (6) and the width of the water jet entry point (2) are related as follows: B = (1.3 ~ 1.5)b In the formula, B is the width of the excavation impact zone (6), and b is the width of the water jet (2) at the water entry position.

5. The slope erosion control water cushion pond structure according to claim 1, characterized in that, The thickness W of the excavation impact zone (6) along the flow direction of the jet (2) has the following relationship: W = (1.2 ~ 1.5)R In the formula, R represents the thickness of the water jet (2) at the water inlet position along the water flow direction.

6. The slope erosion control water cushion pond structure according to claim 1, characterized in that, The excavation impact zone (6) is formed in the area where the jet stream (2) lands on the horse path (3), the slope of the water cushion pond (4), and the bottom plate of the water cushion pond (5).

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