Gravity retaining wall concrete faced rockfill dam used on abrupt slope and construction method of gravity retaining wall concrete faced rockfill dam

Abstract

The gravity retaining wall panel rock-fill dam comprises a dam body, the portion, located above a foundation surface, of the dam body is a rock-fill area, a transition area is arranged on the upstream side of the rock-fill area, a cushion layer is arranged on the upstream side of the transition area, and a reinforced concrete panel is arranged on the upstream side of the cushion layer. The bottom of the reinforced concrete panel is connected with the foundation surface through a toe board, a formwork increasing area is arranged on the portion, below the foundation surface, of the dam body, and a concrete gravity type retaining wall is arranged on the downstream side of the formwork increasing area. The advantages of high strength and good stability of a concrete gravity type retaining wall and high economical efficiency and high deformation adaptability of a reinforced concrete panel are fully utilized, and damming conditions on an abrupt slope are adapted; the concrete gravity type retaining wall obviously improves the stability of a downstream dam slope and prevents a slope toe from sliding and being damaged; the soil retaining surface of the concrete gravity type retaining wall adopts a broken line type, so that the ballasting of rockfill can be fully utilized, and the stability of the concrete gravity type retaining wall is improved.

Description

Technical Field

[0001] The invention relates to a gravity retaining wall panel rockfill dam used on a steep slope and a construction method thereof, belonging to the technical field of water conservancy engineering. Background Art

[0002] With the rapid advancement of water conservancy and hydropower engineering construction in my country and the growing demand for energy regulation, the number of pumped storage power stations has gradually increased. Pumped storage power stations are divided into upper reservoirs and lower reservoirs, and are often built on steep slopes with large drop heights. Many projects use panel rockfill dams as water retaining structures. When building a panel rockfill dam on a steep slope, a long dam slope is always required in the downstream direction to ensure the stability of the downstream slope of the dam. The disadvantage is that it will increase the dam body filling volume and construction period, and increase project investment. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a gravity retaining wall panel rockfill dam for use on a steep slope and a construction method thereof, which can reduce the volume of dam filling, lower the project investment, and improve the stability and safety of the dam.

[0004] The technical solution of a gravity retaining wall panel rockfill dam on a steep slope of the present invention is as follows: the dam body is provided, the dam body is located above the foundation surface and is a rockfill area, a transition area is provided on the upstream side of the rockfill area, a cushion layer is provided on the upstream side of the transition area, a reinforced concrete panel is provided on the upstream side of the cushion layer, the bottom of the reinforced concrete panel is connected to the foundation surface via a toe plate, the dam body is located below the foundation surface and is provided with a mold increasing area, and a concrete gravity retaining wall is provided on the downstream side of the mold increasing area.

[0005] Furthermore, the concrete gravity retaining wall is arranged at the downstream end of the dam body, the upstream side of the concrete gravity retaining wall is connected to the downstream side of the increased mold area, and the bottom surface of the increased mold area is cast on the steep foundation excavation surface.

[0006] Furthermore, the concrete gravity retaining wall includes a wall body and a bottom plate, the upstream side of the wall body is a retaining surface, and the downstream side of the wall body is a back-to-soil surface, the slope ratio of the retaining surface is 1:0.1~1:0.5, and the slope ratio of the back-to-soil surface is 1:0.2~1:0.3.

[0007] Furthermore, inflection points are arranged on the retaining surface of the concrete gravity retaining wall.

[0008] Furthermore, the slope ratio of the upstream and downstream surfaces of the dam body is 1:1.3~1:1.6.

[0009] The technical solution of a construction method of a gravity retaining wall panel rockfill dam on a steep slope of the present invention is: comprising the following steps: ① Excavation of the dam foundation, removal of the covering layer on the foundation surface and steep slope, ensuring that there are no steep slopes and inverted bodies that hinder the compaction of the rockfill, and forming the foundation excavation surface; ②, Construction of toe board; ③. Construct the wall and bottom plate of the concrete gravity retaining wall; ④. Construct the mold-increasing area on the steep slope; ⑤. Construct the rockfill area on the mold-increasing area to form the main body of the dam; ⑥ When the main body of the dam is constructed to the pre-designed elevation, the transition zone, cushion layer and reinforced concrete face plate are constructed, and the bottom of the reinforced concrete face plate is connected to the toe plate.

[0010] Furthermore, the foundation excavation surface only excavates the foundation of the dam and the foundation of the concrete gravity retaining wall, and the ground line is retained downstream of the concrete gravity retaining wall depending on the geological conditions.

[0011] Furthermore, after the bottom plate of the concrete gravity retaining wall is constructed, a bottom drainage hole is reserved, and the diameter of the drainage hole is 200 mm.

[0012] The beneficial effects of the gravity retaining wall panel rockfill dam on a steep slope and the construction method thereof of the present invention are: first, it can fully utilize the advantages of high strength and good stability of the concrete gravity retaining wall and strong economy and strong deformation adaptability of the reinforced concrete panel to adapt to the dam construction conditions on the steep slope; Second, by setting up a concrete gravity retaining wall on the downstream dam slope, the stability of the downstream dam slope can be significantly improved to prevent sliding damage at the slope foot; 3. The retaining surface of the concrete gravity retaining wall adopts a broken line shape, which can make full use of the weight of the rock pile and improve the stability of the concrete gravity retaining wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a gravity retaining wall panel rockfill dam used on a steep slope according to the present invention; Figure 2 yes Figure 1 A local enlarged schematic diagram of point A; Figure 3 yes Figure 1 A partial enlarged schematic diagram of point B.

[0014] In the attached figure: 1. Dam body; 3. Construction surface; 4. Rockfill area; 5. Transition area; 6. Pad layer; 7. Reinforced concrete face plate; 8. Toe plate; 10. Formwork area; 11. Concrete gravity retaining wall; 12. Foundation excavation surface; 13. Wall body; 14. Bottom plate; 15. Retaining surface; 16. Back soil surface; 17. Inflection point; 18. Drainage hole; 19. Ground line. DETAILED DESCRIPTION

[0015] The present invention relates to a gravity retaining wall panel rockfill dam for use on a steep slope. Figure 1 — Figure 3 As shown, it includes a dam body 1, wherein the dam body 1 is located above a foundation surface 3 and is a rockfill area 4, a transition area 5 is arranged on the upstream side of the rockfill area 4, a cushion layer 6 is arranged on the upstream side of the transition area 5, a reinforced concrete panel 7 is arranged on the upstream side of the cushion layer 6, and the bottom of the reinforced concrete panel 7 is connected to the foundation surface 3 via a toe plate 8, and the dam body 1 is located below the foundation surface 3 and is provided with a mold increase area 10, and a concrete gravity retaining wall 11 is arranged on the downstream side of the mold increase area 10.

[0016] Furthermore, the concrete gravity retaining wall 11 is arranged at the downstream end of the dam body 1, and the upstream side of the concrete gravity retaining wall 11 is connected to the downstream side of the mold enhancement area 10, and the bottom surface of the mold enhancement area 10 is cast on the steep foundation excavation surface 12.

[0017] Furthermore, the concrete gravity retaining wall 11 includes a wall body 13 and a bottom plate 14, the upstream side of the wall body 13 is a retaining surface 15, and the downstream side of the wall body 13 is a back-to-earth surface 16, the slope ratio of the retaining surface 15 is 1:0.1~1:0.5, and the slope ratio of the back-to-earth surface 16 is 1:0.2~1:0.3.

[0018] Furthermore, a folding point 17 is provided on the retaining surface 15 of the concrete gravity retaining wall 11. By providing the folding point 17 on the retaining surface 15, the retaining surface 15 is formed into a broken line shape. After one side of the retaining surface 15 of the concrete gravity retaining wall 11 is bent at the folding point 17, it is located above the bottom plate 14 and extends horizontally in the upstream direction. The retaining surface 15 adopts a broken line shape, which is used to increase the stability of the concrete gravity retaining wall 11 by weighting. The folding point 17 is a weak part of the wall body, and the strength at the folding point 17 needs to be calculated.

[0019] Furthermore, the slope ratio of the upstream and downstream surfaces of the dam body 1 is 1:1.3 to 1:1.6, which is determined according to the performance and quality of the dam-building earth and stone materials and the bedrock conditions.

[0020] The present invention also relates to a construction method for a gravity retaining wall panel rockfill dam on a steep slope, comprising the following steps: ① Excavation of the dam foundation, removal of the covering layer on the foundation surface 3 and the steep slope, ensuring that there are no steep slopes and inverted bodies that hinder the compaction of the rockfill body, and forming the foundation excavation surface 12; ②, construct toe board 8; ③. Construct the wall body 13 and the bottom plate 14 of the concrete gravity retaining wall 11; ④. Construct the mold-increasing area 10 on the steep slope; ⑤. Construct the rockfill area 4 on the mold-increasing area 10 to form the dam body 1; ⑥. When the dam body 1 is constructed to the pre-designed elevation, the transition zone 5, cushion layer 6 and reinforced concrete face plate 7 are constructed, and the bottom of the reinforced concrete face plate 7 is connected to the toe plate 8.

[0021] Furthermore, the foundation excavation surface 12 only excavates the foundation of the dam and the foundation of the concrete gravity retaining wall 11, and the ground line 19 is retained downstream of the concrete gravity retaining wall 11 depending on the geological conditions.

[0022] Furthermore, after the bottom plate 14 of the concrete gravity retaining wall 11 is constructed, a bottom drainage hole 18 is reserved, and the diameter of the drainage hole 18 is 200 mm. During construction, it is ensured that the drainage hole 17 is not blocked.

[0023] The present invention discloses a gravity retaining wall panel rockfill dam on a steep slope and a construction method thereof. By setting a concrete gravity retaining wall 11 on the downstream dam slope, the stability of the downstream dam slope can be significantly improved to prevent sliding damage at the slope foot. The retaining surface 15 of the concrete gravity retaining wall 11 adopts a broken line shape, which can make full use of the weight of the rockfill and improve the stability of the concrete gravity retaining wall 11. The advantages of the concrete gravity retaining wall 11, which has high strength and good stability, and the advantages of the reinforced concrete panel 7 rockfill dam, which has strong economy and strong deformation adaptability, can be fully utilized, and the filling volume can be significantly reduced, investment can be saved, and the stability of the dam can be improved.

[0024] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0025] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gravity retaining wall panel rockfill dam for use on a steep slope, characterized in that: The invention comprises a dam body (1), wherein the dam body (1) is located above a foundation surface (3) and is a rockfill area (4), a transition area (5) is arranged on the upstream side of the rockfill area (4), a cushion layer (6) is arranged on the upstream side of the transition area (5), a reinforced concrete panel (7) is arranged on the upstream side of the cushion layer (6), the bottom of the reinforced concrete panel (7) is connected to the foundation surface (3) via a toe plate (8), and the dam body (1) is located below the foundation surface (3) and is provided with a mold-enhancing area (10), and a concrete gravity retaining wall (11) is arranged on the downstream side of the mold-enhancing area (10).

2. A gravity retaining wall panel rockfill dam for use on a steep slope as claimed in claim 1, characterized in that: The concrete gravity retaining wall (11) is arranged at the downstream end of the dam body (1), the upstream side of the concrete gravity retaining wall (11) is connected to the downstream side of the mold enhancement area (10), and the bottom surface of the mold enhancement area (10) is cast on the steep foundation excavation surface (12).

3. A gravity retaining wall panel rockfill dam for use on a steep slope as claimed in claim 1, characterized in that: The concrete gravity retaining wall (11) comprises a wall body (13) and a bottom plate (14); the upstream side of the wall body (13) is a retaining surface (15); the downstream side of the wall body (13) is a back-soil surface (16); the slope ratio of the retaining surface (15) is 1:0.1-1:0.5; the slope ratio of the back-soil surface (16) is 1:0.2-1:0.

3.

4. A gravity retaining wall panel rockfill dam for use on a steep slope as claimed in claim 3, characterized in that: A folding point (17) is provided on the retaining surface (15) of the concrete gravity retaining wall (11).

5. The gravity retaining wall panel rockfill dam for use on a steep slope according to claim 1, characterized in that: The slope ratio of the upstream and downstream surfaces of the dam body (1) is 1:1.3-1:1.

6.

6. A construction method for a gravity retaining wall panel rockfill dam on a steep slope, characterized in that: The following steps are involved: ① Excavation of the dam foundation, removal of the overburden on the foundation surface (3) and steep slopes, ensuring that there are no steep slopes or inverted bodies that would hinder the compaction of the rockfill, and forming the foundation excavation surface (12); ②, construct toe board (8); ③, constructing the wall body (13) and the bottom plate (14) of the concrete gravity retaining wall (11); ④. Constructing the mold-increasing area on the steep slope (10); 5. Constructing the rockfill area (4) on the mold-enhancing area (10) to form the main dam body (1); ⑥. When the main dam body (1) is constructed to the pre-designed elevation, the transition zone (5), cushion layer (6) and reinforced concrete face plate (7) are constructed, and the bottom of the reinforced concrete face plate (7) is connected to the toe plate (8).

7. A gravity retaining wall panel rockfill dam for use on a steep slope and a construction method thereof as claimed in claim 6, characterized in that: The foundation excavation surface (12) only excavates the foundation of the dam and the foundation of the concrete gravity retaining wall (11), and the ground line (19) is retained downstream of the concrete gravity retaining wall (11) depending on the geological conditions.

8. A gravity retaining wall panel rockfill dam for use on a steep slope and a construction method thereof as claimed in claim 7, characterized in that: After the bottom plate (14) of the concrete gravity retaining wall (11) is constructed, a bottom drainage hole (18) is reserved, and the diameter of the drainage hole (18) is 200 mm.

Images