Flexible anti-seepage connection structure of mask-toe plate of mask rockfill dam and its construction method

Abstract

The present invention relates to a flexible anti-seepage connection structure of the mask-toe plate of a mask rockfill dam and a construction method thereof. The purpose of the present invention is to provide a flexible anti-seepage connection structure of the mask-toe plate of a mask rockfill dam with a simple structure and convenient construction and a construction method thereof, so as to ensure that the geomembrane at the anchoring part of the toe plate operates in a low stress level state in the elastic deformation stage for a long time, to ensure the durability of the normal operation of the geomembrane, and at the same time to ensure that the anchoring part of the toe plate has a reliable anti-seepage effect, so as to achieve the effective service life of the dam as a whole. The technical solution of the present invention is: a flexible anti-seepage connection structure of the mask-toe plate of a mask rockfill dam, having a rockfill dam body and a foundation concrete toe plate, characterized in that: an anchoring groove is reserved at the toe plate anchoring part where the surface layer of the foundation concrete toe plate contacts the rockfill dam body, and a dam surface anti-seepage geomembrane is laid on the upstream dam surface of the rockfill dam body. The present invention is applicable to mask rockfill dams that use geomembranes as surface anti-seepage structures.

Description

Technical Field

[0001] The invention relates to a flexible anti-seepage connection structure of a mask-toe plate of a mask rockfill dam and a construction method thereof, and is suitable for a mask rockfill dam using a geomembrane as a surface anti-seepage structure. Background Art

[0002] Geomembrane has excellent anti-seepage performance and tensile deformation performance, and is often used as a reservoir anti-seepage material. Dams and reservoir basins that use geomembranes for anti-seepage have geomembranes anchored to hard structures such as concrete and rock in buildings, slopes, and reservoir bottoms. Studies have shown that there is a significant "clamp effect" in these anchoring locations, making it difficult for the superior deformation adaptability of geomembranes to play a role in the anchoring locations, resulting in high stress on the geomembrane in the anchored area, affecting the durability of the normal operation of the geomembrane, and even directly causing the geomembrane to tear and damage, resulting in failure of the anti-seepage system.

[0003] The geomembrane rockfill dam is a type of rockfill dam with significant economic advantages. However, the anchor connection between the geomembrane and the toe plate is the weakest part of the anti-seepage of this type of rockfill dam. At the same time, there is large uneven deformation and the adverse effect of the "clamp effect" is significant. The safe and reliable operation of the anchor structure is the key to ensuring the normal operation of this type of dam. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in view of the above-mentioned problems, a flexible anti-seepage connection structure of the mask-toe plate of a mask rockfill dam with a simple structure and convenient construction and a construction method thereof are provided to ensure that the geomembrane at the toe plate anchoring position operates in a low stress level state in the elastic deformation stage for a long time, thereby ensuring the durability of the normal operation of the geomembrane and at the same time ensuring that the toe plate anchoring position has a reliable anti-seepage effect, so as to realize the effective service life of the dam as a whole.

[0005] The technical solution adopted by the present invention is: a flexible anti-seepage connection structure of a face mask rockfill dam and a toe plate, which has a rockfill dam body and a foundation concrete toe plate, characterized in that: an anchoring groove is reserved at the toe plate anchoring position where the surface layer of the foundation concrete toe plate contacts the rockfill dam body, and a dam surface anti-seepage geomembrane is laid on the upstream dam surface of the rockfill dam body;

[0006] The anti-seepage geomembrane on the dam surface is anchored to the bottom of the anchor groove through the anchor structure on one side of the anchor groove, and the anchor groove is divided into two relatively independent cavities, wherein the cavity close to the rockfill dam body is filled with plastic filler to form a deformation relaxation zone, and the cavity close to the foundation concrete toe plate is filled with plastic filler to form an auxiliary anti-seepage zone, the outer surface of the plastic filler in the auxiliary anti-seepage zone is in a convex bulge shape, and the bulge surface is covered with a strip geomembrane;

[0007] The strip geomembrane is anchored on the foundation concrete toe plate through an anchoring structure at one side thereof close to the foundation concrete toe plate, and is welded to the dam surface anti-seepage geomembrane at one side thereof close to the rockfill dam body.

[0008] An asphalt sand cushion strip is arranged on one side of the rockfill dam body close to the anchor groove and along the entire length of the anchor groove.

[0009] The surface of the asphalt sand cushion strip is located in the same plane as the upstream surface of the rockfill dam body.

[0010] The dam surface anti-seepage geomembrane portion disposed between the deformation relaxation zone and the auxiliary anti-seepage zone is configured to be wavy.

[0011] The corner of the foundation concrete toe plate on one side close to the anchor groove is an arc.

[0012] The asphalt sand cushion strip is arranged in an arc shape on one side of the anchoring groove.

[0013] The plastic filler is SR or GB plastic filler with anti-seepage ability.

[0014] The anchoring structure comprises bolt holes, bolts, flat steel or angle steel, nuts and rubber gaskets arranged at certain intervals along the anchoring center line of the anchoring groove.

[0015] A construction method for a flexible anti-seepage connection structure of a mask-toe plate of a mask rockfill dam, characterized by the following steps:

[0016] 1. Complete the main structure before the structural joint anchoring construction according to the requirements of the mask rockfill dam, including filling the rockfill dam body, pouring the foundation concrete toe plate, and pouring the consolidation grouting and curtain grouting of the lower part of the foundation concrete toe plate;

[0017] 2. Clean the rockfill dam body along the inner side of the concrete toe plate of the poured foundation according to the filling range requirements of the asphalt sand cushion strip;

[0018] 3. Backfill the asphalt sand cushion strips according to the backfill structure requirements, and use a wooden hammer to tamp the backfill layer by layer during the backfill process;

[0019] 4. Drill bolt holes at a certain interval along the anchor center line of the anchor groove. After cleaning and drying, insert the bolts and fill the holes with mortar or other anchoring agents for anchoring.

[0020] 5. Clean the anchor groove, fill the deformation relaxation area on the side of the asphalt sand cushion strip with plastic fillers such as SR or GB, and set the surface to be wavy;

[0021] 6. Lay the anti-seepage geomembrane on the dam surface, lay rubber gaskets, anti-seepage geomembrane on the dam surface, flat steel or angle steel in sequence along the anchor center line, and finally install nuts and tighten them to the set torque. The anti-seepage geomembrane on the dam surface is close to the plastic filler surface in the deformation relaxation area, and the filler surface is set to a wavy shape;

[0022] 7. Fill the auxiliary anti-seepage area outside the anti-seepage geomembrane on the dam surface with SR or GB plastic filler, and the surface protrudes from the dam surface to form a bulge. Use strip geomembrane to cover the bulge, and use an anchor structure to anchor it on the side connected to the foundation concrete toe plate, and use welding to connect it to the anti-seepage geomembrane on the dam surface.

[0023] The beneficial effects of the present invention are as follows: the present invention utilizes the anti-seepage ability formed by the plastic fillers such as SR or GB filled in the anchoring groove after being squeezed by water pressure, thereby improving the anti-seepage performance of the geomembrane and the toe plate anchoring part; the present invention utilizes the flexibility of the plastic fillers such as SR or GB, so that the geomembrane can effectively provide a reserved deformation when it is stretched due to the settlement difference, and at the same time, the free stretching of the geomembrane in the plastic filler can effectively eliminate the "clamp effect", ensuring that the geomembrane at the toe plate anchoring part is in a low stress level state of the elastic deformation stage for a long time, ensuring the durability of the normal operation of the geomembrane, and at the same time ensuring that the toe plate anchoring part has a reliable anti-seepage effect, so as to achieve the effective service life of the dam as a whole; the present invention utilizes the flatness and flexibility of the asphalt sand cushion strip laid on the side of the anchoring groove of the rockfill dam body, alleviates the top support damage of the hard structure or rockfill to the geomembrane caused by local deformation, and improves the operating conditions of the geomembrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A typical cross-sectional view of an embodiment.

[0025] Figure 2 This is a basic structural diagram of an anchor member according to an embodiment. DETAILED DESCRIPTION

[0026] like Figure 1 As shown, this embodiment is a flexible anti-seepage connection structure of the face mask and toe plate of the face mask rockfill dam, which comprises a rockfill dam body 1, a foundation concrete toe plate 2, and an anti-seepage geomembrane 3 laid on the upstream dam surface of the rockfill dam body 1.

[0027] An anchoring groove is reserved on the surface of the contact part between the foundation concrete toe plate 2 and the rockfill dam body 1 (the toe plate anchoring part), and the corners of the toe plate structure on the side of the foundation concrete toe plate 2 close to the anchoring groove are arc-shaped to avoid sharp corners. At the part of the rockfill dam body 1 close to the foundation concrete toe plate 2, an asphalt sand cushion strip 4 is arranged along the foundation concrete toe plate 2 to form a flexible and flat cushion layer, the surface of the asphalt sand cushion strip 4 is located in the same plane as the upstream surface of the rockfill dam body 1, and the structural section of the asphalt sand cushion strip 4 is arranged in an arc shape on the side close to the foundation concrete toe plate 2.

[0028] The dam surface anti-seepage geomembrane 3 is laid along the upstream dam surface of the rockfill dam body 1. The side of the geomembrane close to the anchor groove is anchored to the bottom of the anchor groove through the anchor structure 5, and the anchor groove is divided into two relatively independent cavities, wherein the anchor groove (cavity) close to the side of the asphalt sand cushion strip 4 is filled with plastic filler to form a deformation relaxation zone 6, and the dam surface anti-seepage geomembrane 3 covers the deformation relaxation zone 6 and is anchored in the reserved anchor groove of the foundation concrete toe plate 2 through the anchor structure 5; the anchor groove (another cavity) outside the dam surface anti-seepage geomembrane 3 is filled with plastic filler, and the outer surface is in a convex bulge shape to form an auxiliary anti-seepage zone 7, and the surface of the auxiliary anti-seepage zone 7 is covered with a strip geomembrane 8, and the side of the strip geomembrane 8 close to the foundation concrete toe plate 2 is anchored to the foundation concrete toe plate 2 through the anchor structure 5, and the side close to the dam surface of the rockfill dam body 1 is welded to the dam surface anti-seepage geomembrane 3.

[0029] In this embodiment, the dam surface anti-seepage geomembrane 3 in the anchor groove is wrapped into a wave shape by filling the deformation relaxation zone 6 and the auxiliary anti-seepage zone 7 with plastic fillers, so that sufficient deformation is reserved at the deformation position of the structural joint. At the same time, the flexible deformation characteristics of the plastic filler in the deformation relaxation zone 6 are used to release the local deformation to the entire length of the dam surface anti-seepage geomembrane in the anchor groove, thereby eliminating the influence of the "clamp effect".

[0030] The plastic filler used in this embodiment is SR or GB or other plastic fillers with anti-seepage function. The geomembrane adopts a two-cloth-one-membrane structure, and a smooth surface is reserved at the welding and anchoring parts.

[0031] like Figure 2 As shown, in this example, the anchoring structure 5 includes a bolt hole 501, a bolt 502, a flat steel or angle steel 503, a nut 504 and a rubber gasket 505, wherein the bolt holes 501 are arranged at a certain interval along the anchoring center line of the anchoring groove, and the rubber gasket 505 is arranged between the dam surface anti-seepage geomembrane 3 (or strip geomembrane 8) and the concrete structure surface; after the bolt hole 501 is cleaned and dried, an anchoring agent is filled in the hole, and the bolt 502 is inserted. After the anchoring agent is cured to a certain strength, the rubber gasket 505, the dam surface geomembrane 3 (or strip geomembrane 8), the flat steel or angle steel 503 are laid at one time, and finally the nut 504 is installed and tightened to the set torque.

[0032] The specific construction method of this embodiment is as follows:

[0033] 1. Complete the main structure before the structural joint anchoring construction according to the requirements of the mask rockfill dam, including filling the rockfill dam body 1, pouring the foundation concrete toe plate 2, and consolidation grouting and curtain grouting of the lower part of the foundation concrete toe plate 2;

[0034] 2. Clean the filling materials on the surface of the rockfill dam along the inner side of the foundation concrete toe plate 2 according to the filling range requirements of the asphalt sand cushion strip 4;

[0035] 3. According to the backfill structure requirements of the asphalt sand cushion strip 4, backfill the asphalt sand cushion strip 4, and use a wooden hammer to tamp the backfill layer by layer during the backfilling process;

[0036] 4. Drill bolt holes 501 at certain intervals (30-50 cm) along the anchor center line of the anchor groove, and after cleaning and drying, implant bolts 502 and anchor them with mortar or other anchoring agents;

[0037] 5. Clean the anchor groove, fill the deformation relaxation area 6 on the side of the asphalt sand cushion strip 4 with plastic fillers such as SR or GB, and set the surface to be wavy;

[0038] 6. Lay the anti-seepage geomembrane 3 on the dam surface at the anchor groove, and set the rubber gasket 505, the anti-seepage geomembrane 3 on the dam surface, the flat steel or angle steel 503 in sequence from bottom to top along the anchor line, and finally install the nut 504 to fix it. The anti-seepage geomembrane 3 on the dam surface is close to the plastic filler surface of the deformation relaxation area 6 and is set to a wave shape;

[0039] 7. Fill the auxiliary anti-seepage area 7 outside the anti-seepage geomembrane 3 on the dam surface with plastic fillers such as SR or GB. The surface protrudes from the dam surface to form a bulge, and a strip geomembrane 8 is used to cover the bulge. The side connected to the foundation concrete toe plate 2 is anchored by an anchor structure 5, and the side connected to the anti-seepage geomembrane 3 on the dam surface is welded.

Claims

1. A mask-toe flexible anti-seepage connection structure of a mask rockfill dam, comprising a rockfill dam body (1) and a foundation concrete toe (2), characterized in that: An anchoring groove is reserved at the toe plate anchoring position where the surface of the foundation concrete toe plate (2) contacts the rockfill dam body (1), and a dam surface anti-seepage geomembrane (3) is laid on the upstream dam surface of the rockfill dam body; The dam surface anti-seepage geomembrane (3) is anchored to the bottom of the anchor groove via an anchor structure (5) on one side of the anchor groove, and the anchor groove is divided into two relatively independent cavities, wherein the cavity close to the rockfill dam body (1) is filled with plastic filler to form a deformation relaxation zone (6), and the cavity close to the foundation concrete toe plate (2) is filled with plastic filler to form an auxiliary anti-seepage zone (7), the outer surface of the plastic filler in the auxiliary anti-seepage zone (7) is in the shape of a convex bulge, and the bulge surface is covered with a strip geomembrane (8); The strip geomembrane (8) is anchored to the foundation concrete toe plate (2) via an anchoring structure (5) on one side thereof and is welded to the dam surface anti-seepage geomembrane (3) on the one side thereof close to the foundation concrete toe plate (2); An asphalt sand cushion strip (4) is provided on one side of the rockfill dam body (1) close to the anchor groove and along the entire length of the anchor groove; The surface of the asphalt sand cushion strip (4) and the upstream surface of the rockfill dam body (1) are located in the same plane; The part of the dam surface anti-seepage geomembrane (3) disposed between the deformation relaxation zone (6) and the auxiliary anti-seepage zone (7) is configured to be wavy; The corners of the foundation concrete toe plate (2) on the side close to the anchor groove are arc-shaped; The asphalt sand cushion strip (4) is arranged in an arc shape on one side of the anchor groove.

2. The flexible anti-seepage connection structure of face mask and toe plate of face mask rockfill dam according to claim 1, characterized in that: The plastic filler is SR or GB plastic filler with anti-seepage ability.

3. The flexible anti-seepage connection structure of face mask and toe plate of face mask rockfill dam according to claim 1, characterized in that: The anchoring structure (5) comprises bolt holes (501), bolts (502), flat steel or angle steel (503), nuts (504), and rubber gaskets (505) arranged at regular intervals along the anchoring center line of the anchoring groove.

4. A construction method for the flexible anti-seepage connection structure of the mask-toe plate of the mask rockfill dam according to any one of claims 1 to 3, characterized in that the steps are as follows: 4.

1. Complete the main structure before the structural joint anchoring construction in accordance with the requirements of the mask rockfill dam, including filling the rockfill dam body (1), pouring the foundation concrete toe plate (2), and pouring the consolidation grouting and curtain grouting of the lower part of the foundation concrete toe plate (2); 4.

2. Clean the rockfill dam body (1) along the inner side of the poured foundation concrete toe plate (2) according to the filling range requirements of the asphalt sand cushion strip (4); 4.

3. Backfill the asphalt sand cushion strip (4) in accordance with the backfill structure requirements of the asphalt sand cushion strip (4), and use a wooden hammer to tamp the backfill layer by layer during the backfilling process; 4.

4. Drill bolt holes (501) at a certain interval along the anchor center line of the anchor groove, and after cleaning and drying, insert bolts (502), and fill the holes with mortar anchoring agent for anchoring; 4.

5. Clean the anchor groove, fill the deformation relaxation area (6) on the side of the asphalt sand cushion strip (4) with SR or GB plastic filler, and set the surface to be wavy; 4.

6. Lay the dam surface anti-seepage geomembrane (3), and lay the rubber gasket (505), the dam surface anti-seepage geomembrane (3), and the flat steel or angle steel (503) in sequence along the anchor center line, and finally install the nut (504) and tighten it to the set torque, so that the dam surface anti-seepage geomembrane (3) is closely attached to the plastic filler surface of the deformation relaxation zone (6), and the filler surface is set to be wavy; 4.

7. SR or GB plastic filler is filled in the auxiliary anti-seepage area (7) outside the anti-seepage geomembrane (3) on the dam surface, and the surface protrudes from the dam surface to form a bulge. The bulge is covered with a strip geomembrane (8). The side connected to the foundation concrete toe plate (2) is anchored by an anchor structure (5), and the side connected to the anti-seepage geomembrane (3) on the dam surface is connected by welding.

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