CN217231678U - Novel rock-fill dam prevention of seepage panel structure - Google Patents

Abstract

The utility model discloses a novel anti-seepage panel structure of a rockfill dam, which comprises an ECC panel laid on the slope of a dam body, a lubricating layer is laid between the ECC panel and the slope of the dam body, and a bottom surface of the ECC panel is provided with a lubricating layer. There are several protrusions, the dam body slope is recessed to form a number of grooves matched with the protrusions, the protrusions are located in the grooves, and the lubricating layer is located between the protrusions and the grooves; this The utility model replaces the traditional ordinary concrete panel with the ECC panel, which turns the original rigid panel into a relatively flexible panel. The ordinary concrete faceplate can actively adapt to the deformation of the rockfill, and can effectively alleviate the cracks of the faceplate caused by the uneven deformation of the rockfill.

Description

A new type of anti-seepage panel structure for rockfill dam

technical field

The utility model belongs to the field of water conservancy and hydropower engineering, in particular to a novel anti-seepage panel structure of a rockfill dam.

Background technique

Concrete face rockfill dam is one of the important dam types in hydraulic structures. It has the characteristics of short construction period, full use of local materials, convenient mechanical construction, and convenient maintenance. It has developed rapidly in recent years. Concrete slab cracking is one of the common diseases of rockfill dams. Concrete slab cracking has occurred in many important rockfill dam projects. The easy cracking of face slabs has become one of the important factors restricting the development of face rockfill dams.

Concrete face rockfill dams generally use reinforced concrete faceplates as the seepage-proof body, transmit the water pressure to the rockfill area through the cushion area, and rely on the rockfill body as the main support body of the dam body. The rockfill dam body will have uneven settlement due to external loads and its own rheological deformation. Due to the large gap between the deformation modulus of the concrete faceplate and the rockfill material, the concrete faceplate will inevitably maintain a coordinated deformation with the rockfill dam body, and the bottom of the faceplate will be dislodged. Under the action of the huge upstream water pressure, the panel at the empty part will produce corresponding bending deformation, and then generate partial tensile stress. If the tensile stress is higher than the tensile strength of the concrete, the structural deformation will appear on the panel. crack. In addition, there is inevitably a certain constraint between the concrete panel and the cushion or the extruded side wall. The temperature shrinkage and drying shrinkage of the concrete panel during construction and operation will also generate tensile stress when it is constrained. When the tensile stress exceeds the tensile strength of the concrete Temperature cracks appear in concrete panels when strength. The engineering practice shows that the shrinkage deformation and vertical void of the concrete slab along the slope surface are the main reasons for the cracking and leakage of the face concrete. It is the main cause of cracking and leakage.

The Chinese invention patent with application number CN201710143012.3 discloses a faceplate structure of a concrete face rockfill dam, including faceplate units arranged on the slope of the rock dam body, and between the face plate unit and the slope of the rock dam body in sequence from outside to inside A cushion layer area and a transition layer area are laid, a support pier is arranged between the face plate unit and the dam body rockfill, a rubber bearing is arranged between the contact surface of the face plate unit and the support pier, and the two adjacent panel units are arranged between them. There is a water stop device in the room.

This kind of panel structure effectively reduces the influence of uneven stress and deformation of the dam body on the cracking and damage of the panel through the way of force transmission by the rubber bearing and the force of the supporting pier. Great improvement while reducing the permeability of the panel. The water-stopping facility of the panel structure has a good water-stopping effect; the reinforced concrete panel of the panel structure is prefabricated, which can effectively speed up the progress of the project, and at the same time, the quality of the panel can be guaranteed. Although this panel structure can make the stress on the panel more uniform, the stress on the panel will not disappear or weaken, and the panel will still crack when the stress on the panel exceeds the maximum stress it can bear.

The Chinese invention patent with the application number CN201910663386.7 discloses a concrete face rockfill dam that improves the stress and deformation state of the faceplate, including a concrete faceplate, a cushion layer, a transition layer, a main rockfill area with increased formwork, The main rockfill area, the secondary rockfill area, the downstream slope protection and the drainage prism, the upstream boundary of the main rockfill area with increased model coincides with the downstream boundary of the transition layer; the downstream boundary of the main rockfill area with increased model includes the upstream side of the dam axis The side part and the downstream part of the dam axis, the upstream part of the dam axis is parallel to the upstream dam slope, and the downstream part of the dam axis is horizontally arranged and extends to the inner side of the downstream protection slope.

This face rockfill dam has the following advantages:

(1) By setting up the main rockfill area with increased formwork between the transition layer and the main rockfill area, the main rockfill area with increased formwork has a stronger resistance to deformation, effectively reducing the impact of water storage on the deformation of the upstream side of the dam body;

(2) By setting the main rockfill area and the main rockfill area with increased formwork at the elevation above 0.5 times the dam height, the influence of the deformation of the middle and upper parts of the dam body affected by water storage can be effectively reduced, and the deformation of the middle and upper parts of the dam body can be effectively reduced. Later deformation;

(3) Avoid or weaken the unfavorable stress and deformation state of concrete panels caused by the deformation of the dam body caused by water storage, reduce the possibility of voiding, collapse, extrusion damage and other problems of the concrete panels, and improve the concrete panel stack The safety of rock dams is conducive to promoting the construction of high or ultra-high concrete face rockfill dams, and can provide assistance for the in-depth development of hydropower in southwest my country.

Although this kind of face rockfill dam can avoid or weaken the unfavorable stress and deformation state of the concrete panel caused by the deformation of the dam body caused by water storage, and reduce the possibility of voiding, collapse, extrusion damage and other problems of the concrete panel, but There are many reasons for the stress on the face of the rockfill dam. This solution can only be aimed at the stress caused by water storage, and has little effect on the impact of the stress caused by other reasons on the face of the rockfill dam.

Therefore, it is necessary to design a rockfill dam faceplate that can cope with the influence of the internal stress of the faceplate caused by various factors on the faceplate.

SUMMARY OF THE INVENTION

The purpose of the utility model is to provide a novel anti-seepage panel structure of a rockfill dam, which solves the problem that the concrete panel of the existing rockfill dam is easily cracked under large stress.

For achieving the above object, the technical scheme adopted by the present utility model is:

A novel anti-seepage panel structure for a rockfill dam includes an ECC panel laid on the slope of the dam body, a lubricating layer is laid between the ECC panel and the slope of the dam body, and the bottom surface of the ECC panel is provided with several protrusions, The depression on the slope surface of the dam body forms a plurality of grooves matched with the protrusions, the protrusions are located in the grooves, and the lubricating layer is located between the protrusions and the grooves.

The utility model replaces the traditional ordinary concrete panel with the ECC panel. The ECC panel is made of fiber-reinforced cement-based composite material ECC. High toughness, crack dispersion and other characteristics turn the original rigid panel into a relatively flexible panel. The ECC material has extremely strong elongation performance and can meet the crack resistance requirements under shrinkage deformation. At the same time, the stiffness of the ECC panel is lower than that of the ordinary concrete panel. It adapts to the deformation of the rockfill, and can effectively alleviate the cracks of the panel caused by the uneven deformation of the rockfill.

By arranging a lubricating layer between the ECC panel and the dam body slope, the utility model reduces the constraint of the ECC panel, ensures the free shrinkage of the ECC panel, reduces the risk of cracking when the ECC panel shrinks, and the ECC panel and the lubricating layer are bonded together.

The utility model limits the position of the ECC panel through the mutual cooperation between the protrusion and the groove, so that the ECC panel can be freely expanded and contracted, and the position of the main body will not be greatly shifted. The ECC panel is laid on the lubricating layer, The purpose is to reduce the constraints on the bottom surface of the ECC panel, but at the same time, it will reduce the frictional force on the bottom surface of the ECC panel. Through the cooperation between the protrusions and the grooves, the ECC panel can be blocked from sliding downward, the gravity of the ECC panel can be transferred to the dam body, and the pressure from the ECC panel on the toe plate can be reduced.

Further, the ECC panel is connected with the wave break wall at the top of the dam body and the toe board at the bottom, and a water stop joint is left at the connection, and a water stop structure is arranged in the water stop joint, and the water stop structure includes: Copper waterstop and rubber waterstop play a waterproof role to avoid water leakage from the dam.

Further, the bottom of the water-stop structure is provided with an edge sealing agent, which further enhances the water-stop effect of the water-stop structure.

Further, the ECC panel is provided with steel bars to enhance the structural strength of the ECC panel.

Further, the lubricating layer is one or more of an emulsified asphalt layer, an asphalt linoleum layer and a geomembrane layer, which can play a waterproof role while facilitating the free expansion and contraction of the ECC panel.

Further, the bottom cover of the dam body is provided with a cover weight to protect the dam body and the ECC panel.

Further, a concrete panel is arranged between the ECC panel and the lubricating layer, and the concrete panel is cast from ordinary concrete materials. The concrete panel has the characteristics of high rigidity and strength, and can better protect the dam body. After the dam slope changes and cracks, the ECC panel also deforms with the concrete panel, but the crack is small and still has the waterproof effect. By setting the concrete panel and the ECC panel, the effect of waterproof and seepage prevention and protection of the dam body can be achieved at the same time. It can also be applied to the renovation of the old dam body, and the ECC panel is laid on the concrete panel on the surface of the old dam body for waterproof and anti-seepage.

Compared with the prior art, the beneficial effects of the present utility model are:

(1) The utility model replaces the traditional ordinary concrete panel with the ECC panel, and turns the original rigid panel into a relatively flexible panel. The ECC material has extremely strong elongation performance, which can meet the requirements of crack resistance under shrinkage deformation, and at the same time ECC The rigidity of the panel is lower than that of the ordinary concrete panel, which can actively adapt to the deformation of the rockfill, and can effectively alleviate the cracks of the panel caused by the uneven deformation of the rockfill.

(2) The present invention reduces the constraint of the ECC panel by arranging a lubricating layer between the ECC panel and the slope of the dam body, ensures the free shrinkage of the ECC panel, and reduces the risk of cracking when the ECC panel shrinks.

(3) The utility model limits the position of the ECC panel through the cooperation between the protrusion and the groove, so that the ECC panel can be freely expanded and contracted, and the position of the main body will not be greatly shifted. The ECC panel is laid on a lubricated The purpose is to reduce the constraints on the bottom surface of the ECC panel, but at the same time, it will reduce the frictional force on the bottom surface of the ECC panel. Increase, through the cooperation of the protrusion and the groove, the ECC panel can be blocked from sliding down, and the gravity of the ECC panel can be transferred to the dam body, and the pressure from the ECC panel on the toe plate can be reduced.

Description of drawings

Fig. 1 is a kind of structural schematic diagram of the anti-seepage panel structure of a new type of rockfill dam in Example 1;

Fig. 2 is a partial enlarged structural schematic diagram at A in Fig. 1;

Figure 3 is a schematic diagram of a partially enlarged structure at B in Figure 1;

4 is a schematic structural diagram of a new type of rockfill dam seepage-proof panel structure in Example 2;

Fig. 5 is a schematic diagram of a partially enlarged structure at C in Fig. 4;

In the picture: 1. Dam body; 2. ECC panel; 3. Lubricating layer; 4. Protrusion; 5. Wave break wall; 6. Toe board; 7. Water stop structure; 8. Edge sealing agent; 9. Cover weight; 10. Concrete panels.

Detailed ways

The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Example 1

As shown in Figures 1-3, the present embodiment provides a new type of anti-seepage panel structure for a rockfill dam, including an ECC panel 2 laid on the slope of the dam body 1, and the ECC panel 2 is connected to the slope of the dam body 1. A lubricating layer 3 is laid between the ECC panels 2, a plurality of protrusions 4 are provided on the bottom surface of the ECC panel 2, and the slope surface of the dam body 1 is recessed to form a number of grooves that match the protrusions 4, and the protrusions 4 are located in the grooves , the lubricating layer 3 is located between the protrusion 4 and the groove.

The utility model replaces the traditional ordinary concrete panel with the ECC panel 2. The ECC panel 2 is made of fiber-reinforced cement-based composite material ECC. Deformation, high toughness, crack dispersion and other characteristics turn the original rigid panel into a relatively flexible panel. ECC material has extremely strong elongation performance, which can meet the crack resistance requirements under shrinkage deformation, and the stiffness of ECC panel 2 is lower than that of ordinary concrete. The panel can actively adapt to the deformation of the rockfill, and can effectively alleviate the cracks in the panel caused by the uneven deformation of the rockfill.

In the present invention, a lubricating layer 3 is arranged between the ECC panel 2 and the slope surface of the dam body 1, so as to reduce the constraint of the ECC panel 2, ensure the free shrinkage of the ECC panel 2, and reduce the risk of cracking when the ECC panel 2 shrinks. The lubricating layer 3 is bonded together.

The utility model limits the position of the ECC panel 2 through the mutual cooperation between the protruding 4 and the groove, so that the ECC panel 2 can be freely expanded and contracted, and the position of the main body will not be greatly shifted. The ECC panel 2 is laid on the The purpose is to reduce the constraint received by the bottom surface of the ECC panel 2, but at the same time, it will reduce the frictional force received by the bottom surface of the ECC panel 2. The ECC panel 2 has the risk of sliding down, and the ECC panel 2 is held by the toe plate 6. , the pressure on the toe plate 6 will increase. Through the mutual cooperation between the protrusion 4 and the groove, the ECC panel 2 can be blocked from sliding down, and the gravity of the ECC panel 2 will be more transferred to the dam body 1, reducing toe The plate 6 is subjected to the pressure from the ECC panel 2 .

Further, the ECC panel 2 is connected with the wave break wall 5 at the top of the dam body 1 and the toe board 6 at the bottom, and a water stop is left at the connection. Forming, then staged pouring, the present embodiment adopts staged pouring, and there is also a water-stop joint between adjacent sections, and a water-stop structure 7 is arranged in the water-stop joint, and the water-stop structure 7 includes copper water-stop and rubber Waterstop, which plays a waterproof role to prevent the dam from leaking.

Further, an edge sealing agent 8 is provided at the bottom of the water-stopping structure 7 to further enhance the water-stopping effect of the water-stopping structure 7 .

Further, the ECC panel 2 is provided with steel bars to enhance the structural strength of the ECC panel 2 .

Further, the lubricating layer 3 is an emulsified asphalt layer, which not only facilitates the free expansion and contraction of the ECC panel 2, but also plays a waterproof role.

Further, the bottom cover of the dam body 1 is provided with a cover weight 9 to protect the dam body 1 and the ECC panel 2 .

Example 2

As shown in FIG. 4 and FIG. 5 , the difference between this embodiment and Embodiment 1 is that a concrete panel 10 is provided between the ECC panel 2 and the lubricating layer 3 , and the concrete panel 10 is cast with ordinary concrete materials. The protrusions 4 arranged on the bottom surface of the ECC panel 2 pass through the concrete panel 10 and are still located in the matching groove. The concrete panel 10 has the characteristics of high rigidity and strength, and can better protect the dam body 1. After the slope of the dam body 1 changes and cracks, the ECC panel 2 also deforms with the concrete panel 10, but the crack is small and still has a waterproof effect. By setting the concrete panel 10 and the ECC panel 2, it can be waterproof and seepage prevention and protection The effect of the dam body 1 can also be applied to the renovation of the old dam body 1. The ECC panel 2 is laid on the concrete panel 10 on the surface of the old dam body 1 for waterproofing and anti-seepage.

Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes and modifications can be made to these embodiments without departing from the principles and spirit of the present invention , alternatives and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (7)

1. A novel rockfill dam anti-seepage panel structure, characterized in that it comprises an ECC panel laid on the slope of the dam body, a lubricating layer is laid between the ECC panel and the slope of the dam body, and the ECC panel is The bottom surface is provided with a number of protrusions, the slope of the dam body is recessed to form a number of grooves that match the protrusions, the protrusions are located in the grooves, and the lubricating layer is located between the protrusions and the grooves . 2. A new type of rockfill dam anti-seepage panel structure according to claim 1, characterized in that, the ECC panel is connected with the wave break wall at the top of the dam body and the toe board at the bottom, and the connection is left. There is a water-stop seam, and a water-stop structure is arranged in the water-stop seam. 3. A new type of rockfill dam anti-seepage panel structure according to claim 2, characterized in that an edge sealing agent is provided at the bottom of the water stop structure. The anti-seepage panel structure of a new type of rockfill dam according to claim 1, characterized in that, steel bars are provided in the ECC panel. 5 . The anti-seepage panel structure of a novel rockfill dam according to claim 1 , wherein the lubricating layer is one or more of an emulsified asphalt layer, an asphalt linoleum layer and a geomembrane layer. 6 . 6 . The anti-seepage panel structure of a novel rockfill dam according to claim 1 , wherein the bottom cover of the dam body is provided with a cover weight. 7 . 7 . The new anti-seepage panel structure of a rockfill dam according to claim 1 , wherein a concrete panel is arranged between the ECC panel and the lubricating layer. 8 .

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