Dam foundation anti-seepage structure of deep covering layer earth and rockfill dam

Abstract

The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a deep covering layer earth and rockfill dam foundation anti-seepage structure which comprises anti-seepage walls, a reinforcing wall and a pouring channel, the anti-seepage walls are distributed on the two sides of the reinforcing wall, a connecting plate is connected to the surfaces of the anti-seepage walls, and second connecting columns are integrally poured on the surfaces of the two sides of the connecting plate; and a first connecting groove is formed in the surface of the diaphragm wall. Under the action of the second connecting column and the first connecting groove, waterproof glue can be coated or waterproof grout can be poured between the second connecting column and the first connecting groove, the connecting performance and the waterproof effect between the diaphragm walls are improved, under the action of the connecting plate, damage caused by integral stress of the diaphragm walls is avoided, the diaphragm walls and the reinforcing wall are poured separately, and the waterproof effect is good. After settlement of the anti-seepage wall is completed, pouring of the reinforcing wall can be completed under the action of the pouring channel and the pouring opening, and the overall anti-seepage performance of the anti-seepage wall is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of water conservancy and hydropower engineering, and specifically relates to an anti-seepage structure for the dam foundation of an earth-rock dam with a deep overburden layer. Background Technique

[0002] When building a high earth-rock dam on an extremely deep overburden layer, a suspended concrete cut-off wall with an integral structure is generally used for anti-seepage; the cut-off wall part located on the upper side of the slope bedrock is equivalent to an end-bearing pile, and the cut-off wall part located on the upper side of the riverbed is equivalent to a friction pile; after the dam body is filled, under the action of loads such as the self-weight of the dam body, the extremely deep overburden layer undergoes uneven settlement, and the cut-off wall part between the slope and the riverbed has uneven deformation, causing the cut-off wall to lose its anti-seepage effect. Summary of the Invention

[0003] The purpose of the present invention is to provide an anti-seepage structure for the dam foundation of an earth-rock dam with a deep overburden layer, so as to solve the problem that under the action of loads such as the self-weight of the dam body in the above-mentioned background technique, the extremely deep overburden layer undergoes uneven settlement, and the cut-off wall part between the slope and the riverbed has uneven deformation, causing the cut-off wall to lose its anti-seepage effect.

[0004] To achieve the above purpose, the present invention provides the following technical solution: an anti-seepage structure for the dam foundation of an earth-rock dam with a deep overburden layer, including a cut-off wall, a reinforcement wall, and a perfusion channel. The cut-off walls are distributed on both sides of the reinforcement wall. A connecting plate is connected to the surface of the cut-off wall. Second connecting columns are integrally cast on both side surfaces of the connecting plate. A first connecting groove is opened on the surface of the cut-off wall. First connecting columns are opened on the adjacent surfaces of the contact surface between the cut-off wall and the first connecting groove. Connecting anchor rods are fixedly connected to the surface of the cut-off wall. Perfusion ports are opened at one end of the perfusion channel close to the cut-off wall and the reinforcement wall. Second connecting grooves are integrally cast on both sides of the reinforcement wall.

[0005] Preferably, the perfusion channel acts on the upper sides of the cut-off wall and the reinforcement wall through the earth-rock dam, and the connecting plate is perfused at the connection spacing between the cut-off walls.

[0006] Preferably, the reinforcement wall is in abutting contact with the surface of the cut-off wall through the second connecting groove and the first connecting column.

[0007] Preferably, the surface of the cut-off wall is inclined, and the connecting anchor rods are evenly distributed on the surface of the cut-off wall.

[0008] Preferably, the position where the perfusion port is opened on the perfusion channel coincides with the position where the reinforcement wall and the perfusion channel are in contact.

[0009] Preferably, the connecting plate and the cut-off wall are in abutting contact through the second connecting column and the first connecting groove.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] 1. By separately pouring the impervious wall and the reinforcement wall, settlement of the deep overburden layer is avoided, stress damage to the impervious wall is prevented, and the impervious walls are distributed in segments on the riverbed. A connecting plate is poured between the impervious walls. Under the action of the second connecting column and the first connecting groove, waterproof glue or waterproof grout can be coated between the second connecting column and the first connecting groove, improving the connection performance and waterproof effect between the impervious walls. Under the action of the connecting plate, damage to the integrity stress of the impervious wall is avoided. By separately pouring the impervious wall and the reinforcement wall, after the settlement of the impervious wall is completed, through the action of the perfusion channel and the perfusion port, the pouring of the reinforcement wall can be completed, improving the overall impervious performance of the impervious wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of the present invention;

[0013] Figure 2 is a three-dimensional schematic structural diagram of the present invention;

[0014] Figure 3 is a three-dimensional exploded schematic view of the connection structure of the impervious wall and the connecting plate of the present invention;

[0015] Figure 4 is a three-dimensional exploded schematic view of the structure of the present invention;

[0016] Figure 5 is a three-dimensional exploded schematic view of the connection structure of the impervious wall and the reinforcement wall of the present invention.

[0017] In the figure: 1. Impervious wall; 11. First connecting groove; 12. First connecting column; 2. Reinforcement wall; 21. Second connecting groove; 3. Perfusion channel; 31. Perfusion port; 4. Connecting plate; 41. Second connecting column; 5. Connecting anchor bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Please refer to Figures 1-5 , an embodiment provided by the present invention:

[0019] An anti-seepage structure for the foundation of an earth-rock dam with a deep overburden layer, comprising a cut-off wall 1, a reinforcement wall 2 and a perfusion channel 3. The cut-off walls 1 are distributed on both sides of the reinforcement wall 2. A connecting plate 4 is connected to the surface of the cut-off wall 1. Second connecting columns 41 are integrally cast on both side surfaces of the connecting plate 4. A first connecting groove 11 is formed on the surface of the cut-off wall 1. First connecting columns 12 are formed on the adjacent surfaces of the contact surface between the cut-off wall 1 and the first connecting groove 11. Connecting anchor bolts 5 are fixedly connected to the surface of the cut-off wall 1. A perfusion port 31 is formed at one end of the perfusion channel 3 close to the cut-off wall 1 and the reinforcement wall 2. Second connecting grooves 21 are integrally cast on both sides of the reinforcement wall 2. Through the connection between the cut-off wall 1 and the reinforcement wall 2, the stability between the cut-off walls 1 is improved under the action of the reinforcement wall 2. Under the action of the perfusion channel 3, it is convenient for the subsequent pouring operation of the reinforcement wall 2.

[0020] Furthermore, the perfusion channel 3 acts on the cut-off wall 1 and the reinforcement wall 2 above the earth-rock dam. The connecting plate 4 is poured at the connection spacing between the cut-off walls 1. Through the connection between the perfusion channel 3 and the earth-rock dam, under the action of the perfusion channel 3, it is convenient for the perfusion operation of the reinforcement wall 2, so that the reinforcement wall 2 is formed between the cut-off walls 1. After the pouring of the reinforcement wall 2 is completed, the perfusion channel 3 is backfilled, so that the reinforcement wall 2 and the earth-rock dam are integrally formed, improving the anti-seepage performance of the cut-off wall 1.

[0021] Furthermore, the reinforcement wall 2 is in abutting contact with the surface of the cut-off wall 1 through the second connecting groove 21 and the first connecting column 12. Through the connection between the reinforcement wall 2 and the second connecting groove 21, the pouring stability between the reinforcement wall 2 and the cut-off wall 1 is improved under the abutting contact between the second connecting groove 21 and the first connecting column 12.

[0022] Furthermore, the surface of the cut-off wall 1 is inclined, and the connecting anchor bolts 5 are evenly distributed on the surface of the cut-off wall 1. Under the action of the inclined surface on the surface of the cut-off wall 1 and the action of the connecting anchor bolts 5, the pouring firmness between the cut-off wall 1 and the earth-rock dam is improved.

[0023] Furthermore, the position where the perfusion port 31 is formed on the perfusion channel 3 coincides with the position where the reinforcement wall 2 contacts the perfusion channel 3. Through the connection between the perfusion channel 3 and the perfusion port 31, under the action of the perfusion port 31, it is convenient for the pouring and forming of the reinforcement wall 2. Under the action of the perfusion channel 3, the connection firmness between the reinforcement wall 2 and the earth-rock dam is improved.

[0024] Furthermore, the connecting plate 4 and the cut-off wall 1 are in abutting contact through the second connecting column 41 and the first connecting groove 11. Through the connection between the connecting plate 4 and the second connecting column 41, under the contact between the second connecting column 41 and the first connecting groove 11, the cut-off walls 1 are connected in sections, avoiding the overall stress damage of the cut-off walls 1, causing damage to the cut-off walls 1 and affecting the anti-seepage effect of the cut-off walls 1.

[0025] Working principle: When carrying out anti-seepage operations on an earth-rock dam, first, a cut-off wall 1 is cast on the riverbed. After the casting is completed, a connecting plate 4 is then grouted to form between the cut-off walls 1. A waterproof adhesive or waterproof grout is applied between the connecting plate 4 and the cut-off wall 1. Then, an earth-rock dam is built on the cut-off wall 1. The cut-off wall 1 sinks under the action of the gravity of the earth-rock dam. When building the earth-rock dam, a grouting channel 3 is set up, and the reinforcement wall 2 is cast through the grouting channel 3 and the grouting port 31 to improve the overall stability of the cut-off wall 1 and achieve an efficient anti-seepage effect. After the grouting of the reinforcement wall 2 is completed, the grouting channel 3 is backfilled to improve the overall stability of the grouting of the reinforcement wall 2.

Claims

1. An anti-seepage structure for the dam foundation of a deep overburden rock-fill dam, comprising a cut-off wall, a reinforcement wall, and a perfusion channel, characterized in that: The impervious wall is distributed on both sides of the reinforcement wall. A connecting plate is connected to the surface of the impervious wall. Second connecting columns are integrally cast on both side surfaces of the connecting plate. A first connecting groove is formed on the surface of the impervious wall. First connecting columns are formed on the adjacent surfaces of the contact surface between the impervious wall and the first connecting groove. Connecting anchor rods are fixedly connected to the surface of the impervious wall. Pouring ports are formed at one ends of the pouring channels close to the impervious wall and the reinforcement wall. Second connecting grooves are integrally cast on both sides of the reinforcement wall.

2. The anti-seepage structure of the dam foundation of a deep overburden earth-rock dam according to claim 1, characterized in that: The pouring channels act on the upper parts of the impervious wall and the reinforcement wall through the earth-rock dam. The connecting plates are poured at the connection spacing between the impervious walls.

3. A seepage prevention structure for the dam foundation of a deep overburden earth-rock dam according to claim 1, characterized in that: The reinforcement wall is in abutting contact with the surface of the impervious wall through the second connecting grooves and the first connecting columns.

4. A seepage prevention structure for the dam foundation of a deep overburden earth-rock dam according to claim 1, characterized in that: The surface of the impervious wall is inclined. The connecting anchor rods are evenly distributed on the surface of the impervious wall.

5. A seepage prevention structure for the dam foundation of a deep overburden earth-rock dam according to claim 1, characterized in that: The position where the pouring port is formed on the pouring channel coincides with the position where the pouring channel contacts the reinforcement wall.

6. The anti-seepage structure for the dam foundation of a deep overburden earth-rock dam according to claim 1, characterized in that: The connecting plate and the impervious wall are in abutting contact through the second connecting columns and the first connecting grooves.

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