Comprehensive anti-seepage body for earth and rockfill dam

Abstract

The utility model relates to the technical field of water conservancy and hydropower, in particular to a comprehensive anti-seepage body for an earth and rockfill dam, which comprises a clay core wall, a closed water curtain wall, a plastic anti-seepage wall and an anti-seepage geomembrane, the clay core wall serves as a core supporting structure of the earth and rockfill dam, is located on the top of a dam foundation of the earth and rockfill dam and transversely penetrates through a whole river channel. An upstream plastic diaphragm wall and a downstream plastic diaphragm wall are arranged at the bottom of the clay core wall, the upper half parts of the diaphragm walls are buried in the clay core wall, and the lower half parts of the diaphragm walls are buried in the dam foundation; a closed water curtain wall is arranged at the bottom of the upstream diaphragm wall along the width direction of the river channel; the anti-seepage geomembrane covers the upstream face of the whole clay core wall, and the left side and the right side of the anti-seepage geomembrane are connected with heavy concrete of the dam abutment in an anchoring mode. The top, the front side and the rear side of the upstream anti-seepage wall are also covered with anti-seepage geomembranes. Potential hazards caused by differential settlement of the soft dam foundation can be more effectively handled, so that the service life of the dam is prolonged, and the later maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to water conservancy and hydropower technical field, concretely is a kind of comprehensive anti-seepage body for earth-rockfill dam. BACKGROUND

[0002] The dam on site is clay core wall rockfill dam, and the dam foundation is deep silt soft foundation with a depth of 40-50 meters. Since the dam foundation is soft, it is necessary to use vibro-replacement stone pile to reinforce and treat the dam foundation to increase the bearing capacity of foundation. Since the stone pile is flexible pile, uneven settlement still exists in the dam foundation after bearing the weight of dam body. If a conventional anti-seepage measure such as conventional grouting curtain + concrete + anti-seepage wall + clay core wall is used, the anti-seepage body is prone to cracking due to uneven settlement of the dam foundation, thereby causing seepage damage and affecting the quality of dam foundation and the safe operation of dam. SUMMARY

[0003] In view of the above and / or problems existing in the prior art, the utility model provides a comprehensive anti-seepage body for earth-rockfill dam, which aims to solve the problem of seepage damage caused by cracking of anti-seepage body due to uneven settlement of dam foundation.

[0004] According to one aspect of the utility model, the utility model provides the following technical scheme:

[0005] A comprehensive anti-seepage body for earth-rockfill dam, comprising a clay core wall, a closed water curtain wall, a plastic anti-seepage wall and an anti-seepage geomembrane. The clay core wall serves as the core support structure of the earth-rockfill dam and is located at the top of the dam foundation of the earth-rockfill dam and transversely across the entire river channel.

[0006] Two plastic anti-seepage walls are arranged at the bottom of the clay core wall, and the upper half of the anti-seepage wall is embedded in the clay core wall, and the lower half is embedded in the dam foundation. A closed water curtain wall is arranged along the river channel width direction at the bottom of the upstream anti-seepage wall.

[0007] The first anti-seepage geomembrane covers the water-facing surface of the entire clay core wall, and the left and right sides of the first anti-seepage geomembrane are anchored and connected with the heavy concrete of the dam abutment.

[0008] The upstream and downstream sides of the upstream anti-seepage wall and the upstream side of the downstream anti-seepage wall are covered with anti-seepage geomembrane.

[0009] Further, the mounting structure of the upstream anti-seepage wall is as follows: the main body of the second anti-seepage geomembrane covers the top and the front and back sides of the upstream anti-seepage wall, the front and back ends of the second anti-seepage geomembrane are rolled up upward and fixed at the bottom of the upstream anti-seepage wall through the anchoring structure, so that the second anti-seepage geomembrane forms a closed area outside the anchoring structure.

[0010] Further, the installation structure of the downstream cutoff wall is as follows: the third impermeable geomembrane is arranged on the water-facing surface of the downstream cutoff wall, the top end of the third impermeable geomembrane covers the top of the upstream cutoff wall, the bottom end is curled upwards and fixed at the bottom of the downstream cutoff wall through the anchoring structure.

[0011] Further, the closed area is filled with foam boards.

[0012] Further, the anchoring structure comprises a pair of clamping plates, a backing plate and anchor bolts; the clamping plates are used for clamping the impermeable geomembrane, the anchor bolts pass through the backing plate, the clamping plates and the impermeable geomembrane and extend into the cutoff wall.

[0013] Further, the backing plate is filled with sealant between the anchor bolts.

[0014] Further, on the front and back sides of the upstream cutoff wall, two anchoring structures are arranged on each side.

[0015] Further, the cutoff wall is made of low-strength large-strain concrete.

[0016] Further, the impermeable geomembrane is made of PVC geomembrane.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] The utility model discloses an innovative comprehensive cutoff body, which combines curtain grouting technology, cutoff wall technology, impermeable geomembrane and clay core wall to form a comprehensive cutoff body structure. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the utility model will be described in detail below in combination with the drawings and detailed embodiments.

[0020] Fig. 1 is the comprehensive cutoff body structure schematic view of the utility model;

[0021] Fig. 2It is the anti-seepage geomembrane installation schematic diagram of the utility model.

[0022] Among them: 1, clay core wall; 2, closed water curtain wall; 3, upstream anti-seepage wall; 4, downstream anti-seepage wall; 5, anti-seepage geomembrane; 6, foam board; 7, anchor bolt; 8, backing plate; 9, clamping plate; 10, dam foundation; 11, sealant. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purpose, features and advantages of the utility model more apparent, obvious and easy to understand, the specific embodiments of the utility model are described in detail below with reference to the drawings.

[0024] Secondly, the utility model is described in detail in combination with the schematic diagram, and in order to facilitate the description, the sectional view of the device structure will be partially enlarged without the general proportion, and the schematic diagram is only an example, which should not limit the scope of the utility model protection herein. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in actual production.

[0025] In order to make the purpose, technical scheme and advantages of the utility model more clear, the embodiments of the utility model will be further described in detail below with reference to the drawings.

[0026] Please refer to Figs. 1-2 The utility model provides a kind of comprehensive anti-seepage body for earth-rockfill dam, including clay core wall 1, closed water curtain wall 2, plastic anti-seepage wall and anti-seepage geomembrane 5;The clay core wall 1 as the core support structure of earth-rockfill dam, located the dam foundation 10 top of earth-rockfill dam and transversely across entire river course. Since clay core wall 1 is made of low permeability coefficient cohesive soil body, to prevent river water from seeping in, two plastic anti-seepage walls of upstream and downstream are arranged at the bottom of clay core wall 1, the upper half of the anti-seepage wall is embedded in clay core wall 1, and the lower half is embedded in dam foundation;Preferably, the anti-seepage wall uses low-strength large-strain concrete, and the vertical strain rate meets the dam foundation settlement requirement, and is coordinated with dam foundation settlement. At the bottom of upstream anti-seepage wall 3 and along the width direction of river course, the overall closed water curtain wall 2 inside dam foundation is formed by curtain grouting.

[0027] The first anti-seepage geomembrane covers the water-facing surface of the entire clay core wall 1, and since the left and right sides of the clay core wall 1 extend to the abutments on the left and right banks, the first anti-seepage geomembrane is anchored and connected to the reinforced concrete of the abutments on the left and right sides.

[0028] The upstream and downstream sides of the upstream anti-seepage wall 3 and the upstream side of the downstream anti-seepage wall 4 are covered with anti-seepage geomembrane.

[0029] The installation structure of the upstream anti-seepage wall 3 is as follows:

[0030] The main body of the second impermeable geomembrane covers the top and the front and back sides of the upstream impervious wall 3, the front and back ends of the second impermeable geomembrane are rolled up and fixed at the bottom of the upstream impervious wall 3 through the anchoring structure, so that the second impermeable geomembrane forms a closed area outside the anchoring structure, and the closed area is filled with the foam board 6 to prevent the river water from seeping into the anchoring structure and the upstream impervious wall 3.

[0031] The mounting structure of the downstream impervious wall 4 is as follows:

[0032] The third impermeable geomembrane is arranged on the water-facing surface of the downstream impervious wall 4, the top end of the third impermeable geomembrane covers the top of the upstream impervious wall 4, the bottom end is rolled up and fixed at the bottom of the downstream impervious wall 4 through the anchoring structure, so that the third impermeable geomembrane forms a closed area outside the anchoring structure, and the closed area is filled with the foam board 6.

[0033] Preferably, the anchoring structure comprises a pair of clamping plates 9, a backing plate 8 and foundation bolts 7; the clamping plates 9 are used for clamping the impermeable geomembrane 5, the foundation bolts 7 pass through the backing plate 8, the clamping plates 9 and the impermeable geomembrane 5 and extend into the impervious wall; further, the backing plate 8 and the foundation bolts 7 are filled with sealant 11 to prevent water from entering the bolt holes and causing anchoring failure.

[0034] Preferably, on the front and back sides of the upstream impervious wall 3, two anchoring structures are arranged on each side to strengthen the anchoring.

[0035] Through the above structure, a comprehensive impermeable body composed of curtain + plastic impervious wall + impermeable geomembrane 5 + clay core wall 1 is formed. The cracking of the clay core wall 1 that may be caused during the uneven settlement of the dam foundation is compensated by the impermeable geomembrane 5, the impermeable geomembrane 5 needs to meet the tensile requirement caused by the uneven settlement of the core wall, and the PVC geomembrane with large elastic elongation and high tensile strength in all directions is adopted.

[0036] Although the utility model has been described above with reference to the embodiments, various improvements can be made and equivalent parts can be replaced without departing from the scope of the utility model. In particular, as long as there is no structural conflict, the features in the embodiments disclosed by the utility model can be combined in any way, and the combinations are not exhaustively described in the specification only for the purpose of saving space and resources. Therefore, the utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A comprehensive anti-seepage body for earth-rock dams, characterized in that: The clay core wall, the closed water curtain wall, the plastic impervious wall and the impervious geomembrane; the clay core wall as the core support structure of the earth-rock dam is located on the top of the dam foundation and across the whole river; Two plastic impervious walls are arranged at the bottom of the clay core wall, the upper half of the impervious wall is embedded in the clay core wall, and the lower half is embedded in the dam foundation; the closed water curtain wall is arranged at the bottom of the upstream impervious wall along the river width direction; The first impervious geomembrane covers the water-facing surface of the whole clay core wall, and the left and right sides of the first impervious geomembrane are anchored and connected with the concrete of the dam abutment; The upstream and downstream sides of the upstream impervious wall and the upstream side of the downstream impervious wall are covered with impervious geomembrane.

2. The integrated cutoff for earth-rock dams according to claim 1, characterized in that, The installation structure of the upstream impervious wall is as follows: the main body of the second impervious geomembrane covers the top and the front and back sides of the upstream impervious wall, the front and back ends of the second impervious geomembrane are rolled up and fixed at the bottom of the upstream impervious wall through the anchor structure, so that the second impervious geomembrane forms a closed area outside the anchor structure.

3. The integrated cutoff for earth-rock dams according to claim 2, characterized in that, The installation structure of the downstream impervious wall is as follows: the third impervious geomembrane is arranged on the water-facing surface of the downstream impervious wall, the top end of the third impervious geomembrane covers the top of the upstream impervious wall, and the bottom end is rolled up and fixed at the bottom of the downstream impervious wall through the anchor structure.

4. The integrated anti-seepage body for earth-rock dams according to claim 2 or 3, characterized in that: The closed area is filled with foam board.

5. The integrated anti-seepage body for earth-rock dams according to claim 2 or 3, characterized in that: The anchor structure includes a pair of clamps, a pad and anchor bolts; the clamps are used to clamp the impervious geomembrane, the anchor bolts pass through the pad, the clamps and the impervious geomembrane and extend into the impervious wall.

6. The integrated cutoff for earth-rock dams according to claim 5, characterized in that: The pad is filled with sealant between the pad and the anchor bolts.

7. The integrated cutoff for earth rock dams according to claim 2, characterized in that: On the front and back sides of the upstream impervious wall, two anchor structures are arranged on each side.

8. The integrated cutoff for earth rock dams as claimed in claim 1, characterized in that: The impervious wall is made of low-strength and large-strain concrete.

9. The integrated cutoff for earth-rock dams according to claim 1, characterized in that: The impervious geomembrane is made of PVC geomembrane.

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