Anti-seepage structure and method for development and utilization of barrier dam

Abstract

The invention discloses an anti-seepage structure and method for weir dam development and utilization. The anti-seepage structure comprises a plastic concrete anti-seepage wall and a dam foundation curtain grouting part located below the plastic concrete anti-seepage wall. The left and right bank curtain grouting anti-seepage parts are located on the two sides of the plastic concrete anti-seepage wall and above the dam foundation curtain grouting part; the plastic concrete anti-seepage wall comprises a middle concrete anti-seepage wall body and rockfill curtain grouting parts located on the upstream and downstream of the concrete anti-seepage wall body correspondingly. The anti-seepage structure and the anti-seepage method have the advantages of being excellent in anti-seepage performance, easy and convenient to construct, high in durability and the like, and can be widely applied to the engineering of transforming the weir body into the weir dam; an integral anti-seepage system is formed by the dam foundation curtain grouting part, the dam body plastic anti-seepage wall and the left and right bank curtain grouting parts of the barrier dam, and the anti-seepage capacity of the barrier dam is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of water conservancy projects and disaster prevention and reduction, and in particular to an anti-seepage structure and method for the development and utilization of landslide dams. Background Art

[0002] The high slopes of the mountains along the river are highly susceptible to damage and landslides due to natural disasters such as earthquakes, rainfall, and melting ice and snow. The landslide fragments and disintegrates along the slope, eventually accumulating in the riverbed, forming a natural dam. Because the formation of a landslide dam is often accompanied by the accumulation of large amounts of earth and rock, the natural reservoirs they create provide irrigation, water supply, and ecological replenishment. Some landslide dams also possess a certain head difference and water storage capacity. Through scientific reinforcement and anti-seepage treatment, they can be converted into small hydropower stations, contributing to the development of clean energy.

[0003] However, the development and utilization of landslide dams still face numerous challenges. Formed by natural accumulation, landslide dams have a complex and diverse material composition, uncompacted soil and rock, a relatively loose structure, and lack anti-seepage structures and discharge facilities. The dam body is easily affected by factors such as water level fluctuations, rainfall, and geological changes, leading to leakage, damage, or dam instability, potentially posing a risk of failure. Therefore, anti-seepage measures for landslide dams have become a key technical challenge in ensuring their safe operation.

[0004] Traditional anti-seepage structures for landslide dams often draw on the design principles of artificial dams for hazard removal, reinforcement, and anti-seepage. These typically employ conventional methods, such as concrete cutoff walls or geotextile impermeable structures on upstream slopes. Concrete cutoff walls involve blasting large rocks within the accumulation, followed by filling and blocking the leakage channels with concentrated grout. However, these methods are often inadequate for addressing the problem of impermeable structures being damaged by uneven settlement, due to the structural complexity and irregular shapes of natural landslide dams.

[0005] Therefore, based on the above technical problems, technicians in this field urgently need to develop an anti-seepage structure and method for the development and utilization of landslide dams. Summary of the Invention

[0006] The purpose of the present invention is to provide an anti-seepage structure and method for the development and utilization of a landslide dam, which can achieve efficient anti-seepage of the landslide dam and significantly improve its stability and safety.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention provides an anti-seepage structure for the development and utilization of a landslide dam, the anti-seepage structure comprising:

[0009] Plastic concrete cut-off wall;

[0010] a dam foundation curtain grouting portion located below the plastic concrete cut-off wall; and

[0011] Left and right bank curtain grouting parts located on both sides of the plastic concrete anti-seepage wall and above the dam foundation curtain grouting part;

[0012] The plastic concrete cut-off wall includes a middle concrete cut-off wall and rockfill curtain grouting parts respectively located upstream and downstream of the concrete cut-off wall.

[0013] Furthermore, a rockfill curtain grouting section is provided upstream and downstream of the concrete cut-off wall.

[0014] Furthermore, the left and right bank curtain grouting parts are formed by drilling and grouting through the left and right bank grouting holes on both sides.

[0015] The present invention also discloses a construction method of an anti-seepage structure for development and utilization of a weir dam. The construction method of the anti-seepage structure mainly comprises the following steps:

[0016] S100. Select the axis of the anti-seepage wall at the pass of the collapsed deposit according to the topographic conditions and the anti-seepage requirements of the dam;

[0017] S200, selecting two rockfill curtain grouting lines on both sides upstream and downstream of the axis of the cut-off wall, setting grouting holes at regular intervals along the curtain grouting lines, and performing curtain grouting on both sides upstream and downstream of the axis of the cut-off wall;

[0018] S300: After the curtain grouting of the two upstream and downstream rockfill bodies of the anti-seepage wall is completed, the construction of the concrete anti-seepage wall will be carried out.

[0019] Furthermore, the construction steps of the rockfill curtain grouting portion upstream and downstream of the anti-seepage wall in step S200 mainly include:

[0020] S201. Drill the grouting holes to the dam crest elevation using an eccentric drill and insert casing;

[0021] S202, placing a blasting device in the casing to the bottom of the dam, connecting electric wires for detonation, and blasting the large rocks in the lower rockfill after the device is filled;

[0022] S203, after blasting, the rockfill is broken, and a grouting machine is used to pour concentrated concrete mortar into the blasted area through a casing, and the concrete is allowed to solidify to form a grouted concrete block;

[0023] S204: Lift the casing to the upper part after pouring and start the next part of the process. The processing method is the same as step S203 until it is gradually lifted to the dam top elevation.

[0024] Furthermore, the curtain grouting parts of the rockfill body on both the upstream and downstream sides of the axis of the cut-off wall are constructed according to step S200.

[0025] Furthermore, the step S300 mainly includes the following steps:

[0026] S301, setting guide walls along both sides of the axis of the cut-off wall, and setting construction platforms on both sides of the axis of the cut-off wall on the top of the dam;

[0027] S302: Use an impact drill and grab bucket to excavate a section of the cut-off wall according to the width of the cut-off wall, and pour concrete into the cut-off wall until it reaches the dam top.

[0028] Furthermore, the concrete anti-seepage wall is cast in a manner of casting one section of concrete anti-seepage wall after another, and joint holes for connecting adjacent concrete anti-seepage walls are provided on both sides of the concrete anti-seepage wall.

[0029] In the above technical solution, the present invention provides an anti-seepage structure and method for the development and utilization of landslide dams, which have the following beneficial effects:

[0030] The anti-seepage structure and method of the present invention have the advantages of excellent anti-seepage performance, simple construction, and strong durability, and can be widely used in the transformation of landslide bodies into landslide dam projects; an overall anti-seepage system is formed by the curtain grouting part of the landslide dam foundation, the plastic anti-seepage wall of the dam body, and the curtain grouting parts of the left and right banks, thereby enhancing the anti-seepage capacity of the landslide dam.

[0031] The structure of the present invention arranges rockfill curtain grouting parts upstream and downstream of the cutoff wall axis, thereby increasing the integrity of the dam, reducing the impact of uneven settlement of the dam on the cutoff wall, and also reducing grout leakage and collapse during the construction of the cutoff wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0033] Figure 1 A schematic cross-sectional view of a dam concrete anti-seepage wall, a dam foundation curtain grouting portion, and left and right bank curtain grouting portions of an anti-seepage structure for development and utilization of a dam disclosed in an embodiment of the present application, along the axis of the dam;

[0034] Figure 2 This is a schematic cross-sectional structural diagram of a plastic concrete anti-seepage wall and a dam foundation curtain grouting portion of an anti-seepage structure for the development and utilization of a landslide dam disclosed in an embodiment of the present application;

[0035] Figure 3 A schematic diagram of the construction of a plastic concrete anti-seepage wall of a landslide dam, which is an anti-seepage structure and method for the development and utilization of a landslide dam, disclosed in an embodiment of the present application;

[0036] Figure 4 A schematic diagram of drilling holes for the curtain grouting portion of the rockfill body arranged upstream and downstream of the anti-seepage wall of a landslide dam in an anti-seepage structure and method for the development and utilization of a landslide dam disclosed in an embodiment of the present application;

[0037] Figure 5 A schematic diagram of the bottom blasting of the curtain grouting portion of the rockfill body of an anti-seepage structure and method for the development and utilization of a landslide dam disclosed in an embodiment of the present application;

[0038] Figure 6 This is a schematic diagram of the grouting consolidation of the curtain grouting part of the rockfill body of an anti-seepage structure and method for the development and utilization of a landslide dam disclosed in an embodiment of the present application.

[0039] Description of reference numerals:

[0040] 1. Dam body; 2. Plastic concrete anti-seepage wall; 3. Dam foundation curtain grouting section; 4. Left and right bank curtain grouting section; 5. Left and right bank grouting holes; 6. Rockfill curtain grouting section; 7. Anti-seepage wall guide wall; 8. Construction platform; 9. Anti-seepage wall axis; 10. Percussion drill; 11. Grab bucket; 12. Drill rod; 13. Casing; 14. Rockfill body; 15. Eccentric drilling tool; 16. Electric wire; 17. Blasting device; 18. Grouting machine; 19. Concrete after grouting. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0042] See also Figures 1 to 6 As shown;

[0043] This embodiment discloses an anti-seepage structure for the development and utilization of a landslide dam, the anti-seepage structure comprising:

[0044] Plastic concrete anti-seepage wall 2;

[0045] The dam foundation curtain grouting section 3 is located below the plastic concrete cut-off wall 2; and

[0046] Curtain grouting anti-seepage sections 4 on both sides of the plastic concrete anti-seepage wall 2 and above the curtain grouting section 3 of the dam foundation;

[0047] The plastic concrete cut-off wall 2 includes a middle concrete cut-off wall and rockfill curtain grouting parts 6 located upstream and downstream of the concrete cut-off wall.

[0048] Specifically, the anti-seepage structure disclosed in this embodiment mainly adopts an anti-seepage structure in which the lower part of the dam body plastic concrete anti-seepage wall 2 is connected to the dam foundation curtain grouting part 3, and the left and right banks curtain grouting parts 4 are connected on the left and right sides; the structure of this embodiment forms an overall anti-seepage system through the dam body plastic concrete anti-seepage wall 2, the dam foundation curtain grouting part 3 and the left and right banks curtain grouting anti-seepage parts 4, which is used to prevent the landslide dam from leaking and reduce the risk of landslide dam leakage and dam body instability.

[0049] In addition, the plastic concrete cutoff wall 2 of this embodiment mainly includes a concrete cutoff wall + rockfill curtain grouting sections 6 on both sides. After the rockfill curtain grouting sections 6 are laid out, the landslide dam around the cutoff wall is formed into an integral whole, and then the concrete cutoff wall of the dam body is excavated and cast. This embodiment mainly adopts the pre-explosion + pre-injection of thick slurry method to blast large rocks in the blast pile and fill and block large cavities and leakage channels, thereby reducing leakage and collapse during the construction of the cutoff wall, and also reducing the impact of uneven settlement of the landslide dam on the cutoff wall.

[0050] Preferably, a rockfill curtain grouting section 6 is provided upstream and downstream of the concrete cut-off wall of this embodiment.

[0051] Preferably, the left and right bank curtain grouting parts 4 of this embodiment are formed by drilling and grouting the left and right bank grouting holes 5 on both sides.

[0052] The present invention also discloses a construction method of an anti-seepage structure for development and utilization of a weir dam. The construction method of the anti-seepage structure mainly comprises the following steps:

[0053] S100. Based on the topographic conditions and the dam anti-seepage requirements, select the anti-seepage wall axis 9 at the collapsing deposit pass to reduce excavation disturbance to the slope and ensure that the anti-seepage line of the entire dam axis avoids the thicker part of the collapsing deposit, thus shortening the anti-seepage line and achieving the best anti-seepage effect.

[0054] In addition, in the design of the anti-seepage structure of the landslide dam body, the anti-seepage structure of the dam body adopts a vertical anti-seepage scheme in which the lower part of the plastic concrete anti-seepage wall 1 is connected to the curtain grouting. The lower vertical anti-seepage curtain penetrates into the impermeable layer or weak permeable layer of the bedrock to ensure that water cannot penetrate through the dam foundation, thereby improving the anti-seepage capacity of the dam body.

[0055] S200, selecting two rockfill curtain grouting lines on both sides upstream and downstream of the cut-off wall axis 8, setting grouting holes at regular intervals along the curtain grouting lines, and performing curtain grouting on both sides upstream and downstream of the cut-off wall axis 8;

[0056] S300: After the curtain grouting of the two upstream and downstream rockfill bodies of the anti-seepage wall is completed, the construction of the concrete anti-seepage wall will be carried out.

[0057] The dam foundation curtain grouting part 3 and the left and right bank curtain grouting parts 4 of this embodiment are similar to conventional dam anti-seepage curtain grouting methods. The left and right bank curtain grouting parts 4 perform drilling and grouting through the left and right bank grouting holes 5 .

[0058] Preferably, the construction steps of the rockfill curtain grouting section 6 upstream and downstream of the anti-seepage wall in step S200 of this embodiment mainly include:

[0059] S201, using an eccentric drill 15 to drill to the dam crest elevation at the grouting hole, and inserting a casing 13;

[0060] S202: Place the blasting device 17 in the casing 13 to the bottom of the dam, connect the wire 16 for detonation, and blast the large rocks in the lower rockfill 14 after the device is filled.

[0061] S203: After blasting, the rockfill body 14 is broken, and a grouting machine 18 is used to pour concentrated concrete mortar into the blasted area through the casing 13, and the concrete is allowed to solidify to form a grouted concrete block.

[0062] S204: Lift the casing 13 to the upper part after pouring and start the next part of the process. The processing method is the same as step S203 until it is gradually lifted to the dam top elevation.

[0063] This embodiment adopts the strategy of blasting first and then grouting with thick slurry to perform curtain grouting on the upstream and downstream rockfill bodies. This reduces the leakage and collapse of the dam body caused by excessive passage or large gaps during the construction of the cut-off wall, and avoids the impact of uneven settlement of the dam body on the cut-off wall.

[0064] Preferably, the rockfill curtain grouting parts 6 on both the upstream and downstream sides of the cut-off wall axis 9 of this embodiment are constructed according to step S200.

[0065] Preferably, step S300 of this embodiment mainly includes the following steps:

[0066] S301, setting guide walls 7 on both sides of the cutoff wall axis 9, and setting construction platforms 8 on both sides of the cutoff wall axis 9 on the top of the dam;

[0067] S302: Use the impact drill 10 and the grab bucket 11 to excavate a section of the cut-off wall space according to the width of the cut-off wall, and pour concrete into the cut-off wall until it reaches the dam top.

[0068] Preferably, the concrete cut-off wall of this embodiment is cast in a manner of casting one section of concrete cut-off wall after another, and joint holes for connecting adjacent concrete cut-off walls are provided on both sides of the concrete cut-off wall.

[0069] In the above technical solution, the present invention provides an anti-seepage structure and method for the development and utilization of landslide dams, which have the following beneficial effects:

[0070] The anti-seepage structure and method of the present invention have the advantages of excellent anti-seepage performance, simple construction, and strong durability, and can be widely used in the transformation of a landslide body 1 into a landslide dam project; an overall anti-seepage system is formed by the curtain grouting part 3 of the landslide dam foundation, the plastic concrete anti-seepage wall 2 of the dam body, and the curtain grouting parts 4 of the left and right banks, thereby enhancing the anti-seepage capacity of the landslide dam.

[0071] The structure of the present invention arranges the rockfill curtain grouting part 6 upstream and downstream of the cutoff wall axis 9, thereby increasing the integrity of the dam, reducing the impact of uneven settlement of the dam on the cutoff wall, and also reducing leakage and collapse during the construction of the cutoff wall.

[0072] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. An anti-seepage structure for the development and utilization of a landslide dam, characterized in that: The anti-seepage structure includes: Plastic concrete anti-seepage wall (2); a dam foundation curtain grouting portion (3) located below the plastic concrete anti-seepage wall (2); and Left and right bank curtain grouting sections (4) located on both sides of the plastic concrete anti-seepage wall (2) and above the dam foundation curtain grouting section (3); The plastic concrete anti-seepage wall (2) comprises a middle concrete anti-seepage wall and rockfill curtain grouting parts (6) respectively located upstream and downstream of the concrete anti-seepage wall.

2. The anti-seepage structure for the development and utilization of a landslide dam according to claim 1, characterized in that: A rockfill curtain grouting section (6) is provided upstream and downstream of the concrete anti-seepage wall.

3. The anti-seepage structure for the development and utilization of a landslide dam according to claim 1, characterized in that: The left and right bank curtain grouting parts (4) are formed by drilling and grouting through the left and right bank grouting holes (5) on both sides.

4. A construction method for an anti-seepage structure for the development and utilization of a landslide dam, characterized in that: The construction method of the anti-seepage structure according to any one of claims 1 to 3 mainly comprises the following steps: S100, selecting an anti-seepage wall axis (9) at the collapsing accumulation body pass according to the topographic conditions and the anti-seepage requirements of the dam; S200, selecting two rockfill curtain grouting lines on both sides of the upstream and downstream of the anti-seepage wall axis (9), setting grouting holes at regular intervals along the curtain grouting lines, and performing curtain grouting treatment on both sides of the upstream and downstream of the anti-seepage wall axis (9); S300: After the curtain grouting of the two upstream and downstream rockfill bodies of the anti-seepage wall is completed, the construction of the concrete anti-seepage wall will be carried out.

5. The construction method of an anti-seepage structure for development and utilization of a landslide dam according to claim 4, characterized in that: The construction steps of the rockfill curtain grouting section (6) upstream and downstream of the anti-seepage wall in step S200 mainly include: S201, using an eccentric drill (15) to drill to the dam top elevation at the grouting hole, and inserting a casing (13); S202, placing a blasting device in the casing (13) to the bottom of the dam, connecting electric wires for detonation, and blasting the large rocks in the lower rockfill body (14) after the device is filled; S203, after blasting, the rockfill body (14) is broken, and a grouting machine (18) is used to pour thick concrete mortar into the blasting treatment part through the casing (13), and wait for the concrete to solidify to form a concrete block after grouting; S204, lifting the casing (13) to the upper part after pouring, and starting the next part of the processing, the processing method is the same as step S203, until it is gradually lifted to the dam top elevation.

6. The construction method of an anti-seepage structure for development and utilization of a landslide dam according to claim 5, characterized in that: The rockfill curtain grouting parts (6) on both the upstream and downstream sides of the anti-seepage wall axis (9) are constructed according to step S200.

7. The construction method of an anti-seepage structure for development and utilization of a landslide dam according to claim 4, characterized in that: The step S300 mainly includes the following steps: S301, setting up cut-off wall guide walls (7) along both sides of the cut-off wall axis (9), and setting up construction platforms (8) on both sides of the cut-off wall axis (9) on the top of the dam; S302, using an impact drill (10) and a grab bucket (11) to excavate a section of the cut-off wall space according to the width of the cut-off wall, and pouring concrete into the cut-off wall until it reaches the dam top.

8. The construction method of an anti-seepage structure for development and utilization of a landslide dam according to claim 7, characterized in that: The concrete anti-seepage wall is cast in a manner of casting one section of concrete anti-seepage wall after another, and joint holes for connecting adjacent concrete anti-seepage walls are provided on both sides of the concrete anti-seepage wall.

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