A dam reservoir seepage prevention curtain structure in karst area

Abstract

The utility model belongs to the technical field of water and electricity construction, concretely relates to a karst area dam reservoir anti -infiltration curtain structure, including dam main body, excavating upper layer grouting flat hole and lower layer grouting flat hole on the both sides of dam main body, setting up upper layer concrete secondary lining in upper layer grouting flat hole, setting up lower layer concrete secondary lining in lower layer grouting flat hole, setting up the uniformly distributed upper layer grouting hole on upper layer concrete secondary lining, setting up the uniformly distributed lower layer grouting hole on lower layer concrete secondary lining, the upper layer grouting hole is connected with lower layer grouting hole by lap joint grouting inclined hole. The scheme adopts two layers grouting curtain structure, and the upper and lower two layers are connected by tower joint grouting curtain, form a whole curtain wall, form a stable anti -infiltration system, especially for the dam reservoir of karst area, and the anti -infiltration effect is very good.

Description

Technical Field

[0001] This utility model relates to a seepage prevention curtain structure for dams and reservoirs in karst areas, belonging to the field of hydropower construction technology. Background Technology

[0002] Curtain grouting has always been a primary method for seepage prevention in the foundations of hydropower structures, playing a crucial role in ensuring their safe operation. Existing curtain grouting structures primarily involve the top of the curtain connecting to the concrete gate slab or dam body, with the bottom penetrating to a certain depth into relatively impermeable rock strata to prevent or reduce the infiltration of groundwater into the foundation. Simultaneously, it can work in conjunction with the downstream drainage system to reduce the uplift pressure of seepage water on the gate dam. Therefore, curtain grouting is a key process in water conservancy engineering construction, directly impacting the success or failure of water storage after the reservoir dam is completed. However, in karst areas, due to the complex geological features, existing curtain grouting structures suffer from several drawbacks, including poor seepage prevention. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a seepage prevention curtain structure for dams and reservoirs in karst areas, which effectively prevents water leakage in dams and reservoirs in karst areas.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A seepage prevention curtain structure for a dam reservoir in a karst area includes a dam body, an upper grouting tunnel and a lower grouting tunnel excavated on both banks of the dam body, an upper concrete secondary lining in the upper grouting tunnel, a lower concrete secondary lining in the lower grouting tunnel, uniformly distributed upper grouting holes on the upper concrete secondary lining, and uniformly distributed lower grouting holes on the lower concrete secondary lining, with the upper and lower grouting holes connected by overlapping grouting inclined holes.

[0006] Furthermore, the upper grouting tunnel is slightly higher than the water level of the main dam body.

[0007] Furthermore, the lower grouting tunnel passes through the bottom of the main dam structure.

[0008] Furthermore, both the upper and lower grouting holes are arranged in two rows, with a spacing of 1-2m between each grouting hole.

[0009] Furthermore, a construction passage is provided in the main body of the dam, and a foundation grouting gallery is provided under the construction passage, which connects to the lower grouting tunnel.

[0010] The present invention relates to a seepage prevention curtain structure for dams and reservoirs in karst areas. Its advantages are as follows: This scheme adopts an upper and lower two-layer grouting curtain structure, and the upper and lower layers are connected by a tower-jointed grouting curtain to form an integral curtain wall, forming a stable seepage prevention system. In particular, it has a very good seepage prevention effect for dams and reservoirs in karst areas. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a seepage prevention curtain structure for dams and reservoirs in karst areas according to this utility model;

[0012] Figure 2 This is a schematic diagram of the concrete secondary lining of this utility model;

[0013] Figure 3 This is a schematic diagram of the grouting hole arrangement of this utility model;

[0014] Figure 4 This is a schematic diagram of the grouting curtain formed after grouting in the grouting hole according to this utility model. Detailed Implementation

[0015] The present invention will be described in detail below with reference to specific implementation examples. The following implementation examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way.

[0016] like Figure 1 — Figure 4 As shown, this utility model relates to a seepage prevention curtain structure for a dam reservoir in a karst area, including a dam body 1. An upper grouting tunnel 2 and a lower grouting tunnel 3 are excavated on both banks of the dam body 1. An upper concrete secondary lining 8 is installed in the upper grouting tunnel 2, and a lower concrete secondary lining 9 is installed in the lower grouting tunnel 3. The upper concrete secondary lining 8 is provided with evenly distributed upper grouting holes 10, and the lower concrete secondary lining 9 is provided with evenly distributed lower grouting holes 11. The upper grouting holes 10 and the lower grouting holes 11 are connected by overlapping grouting inclined holes 12.

[0017] During the actual construction, upper grouting tunnels 2 and lower grouting tunnels 3 were excavated on both banks of the main dam 1. After excavation, concrete linings were installed on both upper grouting tunnels 2 and lower grouting tunnels 3, forming upper concrete lining 8 and lower concrete lining 9. Upper grouting holes 10 were drilled on upper concrete lining 8, and lower grouting holes 11 were drilled on lower concrete lining 9. However, in actual construction, the inclination of ultra-deep boreholes was difficult to control, causing the upper and lower grouting holes to not be on the same vertical line. Therefore, an overlapping grouting inclined hole 12 is drilled between the upper grouting hole 10 and the lower grouting hole 11. Then, grouting is performed on the upper grouting hole 10 and the lower grouting hole 11 respectively to form an upper grouting curtain 13 and a lower grouting curtain 14. The overlapping grouting inclined hole 12 is grouted through the upper grouting hole 10 to form an overlapping grouting curtain 15. The upper grouting curtain 13, the overlapping grouting curtain 15 and the lower grouting curtain 14 constitute an integral grouting curtain to achieve the purpose of seepage prevention for the dam reservoir.

[0018] Furthermore, the upper grouting tunnel 2 is slightly higher than the water level of the main dam 1.

[0019] Furthermore, the lower grouting tunnel 3 passes through the bottom of the dam body 1.

[0020] Furthermore, both the upper grouting hole 10 and the lower grouting hole 11 are arranged in two rows, with a spacing of 1-2m between each grouting hole. During construction, the upper and lower grouting holes can each be constructed in two rows, and the holes can be densified in sequence (Sequence I hole, Sequence II hole, Sequence III hole).

[0021] Furthermore, a construction passage 4 is provided in the main body of the dam 1, and a foundation grouting gallery 5 is provided under the construction passage 4. The foundation grouting gallery 5 is connected to the lower grouting tunnel 3. The lower grouting within the scope of the main body of the dam 1 can enter the foundation grouting gallery 4 through the construction passage 5 for grouting operations. After the grouting operation is completed, the construction passage 5 is sealed off.

[0022] The above specific embodiments are used to explain and illustrate the present utility model, and are not intended to limit the present utility model. Any modifications and changes made to the present utility model within the spirit and scope of the claims shall fall within the protection scope of the present utility model.

Claims

1. A seepage prevention curtain structure for dams and reservoirs in karst areas, characterized in that: The dam body (1) includes an upper grouting tunnel (2) and a lower grouting tunnel (3) excavated on both sides of the dam body (1). An upper concrete secondary lining (8) is installed in the upper grouting tunnel (2), and a lower concrete secondary lining (9) is installed in the lower grouting tunnel (3). An evenly distributed upper grouting hole (10) is installed on the upper concrete secondary lining (8), and an evenly distributed lower grouting hole (11) is installed on the lower concrete secondary lining (9). The upper grouting hole (10) and the lower grouting hole (11) are connected by an overlapping grouting inclined hole (12).

2. The seepage prevention curtain structure for dams and reservoirs in karst areas as described in claim 1, characterized in that... The upper grouting holes (10) and the lower grouting holes (11) are arranged in two rows, with a spacing of 1-2m between each grouting hole.

3. The seepage prevention curtain structure for dams and reservoirs in karst areas as described in claim 1, characterized in that... A construction passage (4) is set in the main body of the dam (1), and a foundation grouting gallery (5) is set under the construction passage (4). The foundation grouting gallery (5) is connected to the lower grouting tunnel (3).

4. The seepage prevention curtain structure for dams and reservoirs in karst areas as described in claim 1, characterized in that... The upper grouting tunnel (2) is slightly higher than the water level of the main dam (1).

5. The seepage prevention curtain structure for dams and reservoirs in karst areas as described in claim 1, characterized in that... The lower grouting tunnel (3) passes through the bottom of the main body of the dam (1).

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