CN114753313A - Small-size reservoir dam body seepage prevention structure - Google Patents
Small-size reservoir dam body seepage prevention structure Download PDFInfo
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- CN114753313A CN114753313A CN202210579401.1A CN202210579401A CN114753313A CN 114753313 A CN114753313 A CN 114753313A CN 202210579401 A CN202210579401 A CN 202210579401A CN 114753313 A CN114753313 A CN 114753313A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
- E02B3/123—Flexible prefabricated covering elements, e.g. mats, strips mainly consisting of stone, concrete or similar stony material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
- E02B3/126—Flexible prefabricated covering elements, e.g. mats, strips mainly consisting of bituminous material or synthetic resins
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/06—Placing concrete under water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/11—Hard structures, e.g. dams, dykes or breakwaters
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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Abstract
The invention discloses an earth-rock mixed dam, wherein the water-facing side of the earth-rock mixed dam is an upstream dam slope, a slope surface of the upstream dam slope is sequentially provided with a fine gravel layer, a composite geomembrane, a gravel cushion layer and a cast-in-situ C25 concrete panel from bottom to top, a second C25 concrete cover adopts SR plastic packing for filling joints, a part of a parting of a first C25 concrete cover weight, which is positioned below a second C25 concrete cover weight, adopts SR plastic packing for filling joints, other parts adopt asphalt grid plates for filling joints, a vertical water stop copper sheet is positioned between the SR plastic packing for filling joints and the asphalt grid plates for filling joints, a C25 concrete tooth wall is arranged at the bottom of the first C25 concrete cover weight, and a curtain column is arranged below the first C25 concrete cover weight.
Description
Technical Field
The invention relates to a reservoir danger removal reinforcing structure, in particular to a small reservoir dam body seepage-proofing structure.
Background
At present, most of small and medium-sized reservoirs have long running years, so that the current conditions are mostly ill. The dangerous reservoirs not only lack the safety of self-buildings, but also have the annual reduction of benefits. Water conservancy is the life line of agriculture, and reservoirs are important facilities of the water conservancy industry, and in order to ensure that the reservoirs can safely operate and continue to normally exert benefits, danger removal and reinforcement are needed for the reservoirs.
The seepage is a common fault of the dam, including dam body seepage and dam foundation seepage, and the seepage prevention is always the key point and the difficulty of dam reinforcement. In case of dangerous situations such as perforating and dam breaking, life and property safety can be seriously threatened. The design work is an important link for the reinforcement construction of the dangerous reservoir, comprehensively analyzes and demonstrates the technical, economic, resource, environmental and other conditions required by the risk removal reinforcement of the reservoir, determines the overall scheme of the engineering risk removal reinforcement, and provides design documents and drawings with technical bases for implementing the reinforcement construction. Therefore, how to reasonably select the optimal design scheme, reduce the leakage amount of the reservoir dam and solve the problem of the leakage of the reservoir dam becomes the key of reservoir danger removal and reinforcement.
Disclosure of Invention
The invention aims to provide an anti-seepage structure for a small reservoir dam body aiming at the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
an anti-seepage structure of a small reservoir dam body comprises an earth-rock mixed dam, wherein the water side of the earth-rock mixed dam is an upstream dam slope, a fine gravel layer, a composite geomembrane, a gravel cushion layer and a cast-in-situ C25 concrete panel are sequentially arranged on the slope surface of the upstream dam slope from bottom to top,
the slope toe of the upstream dam slope is provided with a C25 concrete cover weight, the C25 concrete cover weight comprises a first C25 concrete cover weight and a second C25 concrete cover weight, the second C25 concrete cover weight is arranged at the upper part of one side of the first C25 concrete cover weight close to the slope toe of the upstream dam slope, the composite geomembrane is pressed between the first C25 concrete cover weight and the second C25 concrete cover weight, the geomembrane anchoring part sequentially penetrates through the second C25 concrete cover weight, the composite geomembrane and the first C25 concrete cover weight from top to bottom for anchoring, the parting in the second C25 concrete cover weight direction is filled with SR plastic filling materials, the part, below the second C25 concrete cover weight, of the parting in the first C25 concrete cover weight width range is filled with SR filling plastic filling materials, the other parts, in the first C25 concrete cover weight width range, adopt asphalt filling grid plates, the positions of the asphalt filling materials are aligned with the SR filling plastic filling materials, the vertical water stop filler is positioned between the SR filling materials and the asphalt filling plastic filling materials, the bottom of the first C25 concrete cover is provided with a C25 concrete tooth wall, the bottom end of the vertical water stop copper sheet is connected with the C25 concrete tooth wall, a curtain grouting column is arranged below the first C25 concrete cover, and the curtain grouting column sequentially penetrates through the strongly weathered sandstone and the slightly weathered sandstone.
The composite geomembrane as described above is a polyethylene geotextile film.
The nominal breaking strength of the composite geomembrane is more than or equal to 12KN/m, the longitudinal and transverse breaking strength is more than 12KN/m, the CBR bursting strength is more than 2.2KN, and the longitudinal and transverse tearing strength is more than 0.4 KN.
As mentioned above, the thickness of the gravel layer is 15cm, the thickness of the gravel cushion layer is 10cm, and the thickness of the cast-in-situ C25 concrete panel is 12 cm.
As mentioned above, a plurality of drain pipes are sequentially arranged on the upstream dam slope along the width direction, and each drain pipe penetrates through the cast-in-situ C25 concrete panel and extends into the broken stone cushion layer.
The pipe diameter of the water discharge pipe is DN 80-DN 150.
The grouting material of the curtain grouting column adopts silicate cement grout, and the strength grade of the silicate cement is not lower than 42.5.
The portland cement slurry has a water-to-cement weight ratio of 3: 1 or 2:1 or 1:1 or 0.8:1 or 0.6:1 as described above.
As described above, the permeability of slightly weathered sandstone is less than 10 Lu.
Compared with the prior art, the invention has the following advantages:
the composite geomembrane is pressed between the first C25 concrete cover weight and the second C25 concrete cover weight and is anchored through the geomembrane anchoring piece, so that the connection tightness of the composite geomembrane can be ensured; the C25 concrete cover provides an operation platform for the curtain grouting column, and the C25 concrete cover joint adopts SR plastic packing, vertical water stop copper sheet, C25 concrete tooth wall and other structures, which can effectively block the water from entering the dam body, reduce the leakage of the reservoir dam body to the maximum extent, and solve the leakage problem of the reservoir dam body.
Drawings
FIG. 1 is a schematic plan view of the present invention.
FIG. 2 is a first cross-sectional structural view (without split) of the present invention.
FIG. 3 is a second cross-sectional structural view (at the split) of the present invention.
In the figure: 1-upstream dam slope; 2-1, a first C25 concrete cover weight, 2-2, a second C25 concrete cover weight, 3-C25 concrete tooth walls, 4-curtain grouting columns, 5-drainage pipes, 6-fine gravel layers, 7-composite geomembranes, 8-gravel cushion layers, 9-cast-in-place C25 concrete panels, 10-anti-skidding grooves, 11-SR plastic filler joint filling, 12-strongly weathered sandstone, 13-slightly weathered sandstone, 14-geomembrane anchoring parts, 15-asphalt grid plate joint filling, 16-vertical water stop copper sheets and 17-earth-rock mixed dams.
Detailed Description
The invention will be described in further detail below to facilitate the understanding and practice of the invention by those skilled in the art, and it is to be understood that the description herein is merely illustrative and explanatory of the invention and is not restrictive thereof.
An anti-seepage structure of a small reservoir dam body comprises an earth-rock mixed dam 17, wherein the water side of the earth-rock mixed dam 17 is an upstream dam slope 1, a fine gravel layer 6, a composite geomembrane 7, a gravel cushion layer 8 and a cast-in-situ C25 concrete panel 9 are sequentially arranged on the slope surface of the upstream dam slope 1 from bottom to top,
The slope toe of the upstream dam slope 1 is provided with a C25 concrete cover weight 2, the C25 concrete cover weight 2 comprises a first C25 concrete cover weight 2-1 and a second C25 concrete cover weight 2-2, the second C25 concrete cover weight 2-2 is arranged at the upper part of one side of the first C25 concrete cover weight 2-1 close to the slope toe of the upstream dam slope 1, a composite geomembrane 7 is pressed between the first C25 concrete cover weight 2-1 and the second C25 concrete cover weight 2-2, a geomembrane anchor 14 sequentially penetrates through the second C25 concrete cover weight 2-2, the composite geomembrane 7 and the first C25 concrete cover weight 2-1 from top to bottom for anchoring, the split joint of the second C25 concrete cover weight 2-2 in the width direction adopts SR plastic packing for filling 11, the split joint of the first C25 concrete cover weight 2-1 in the width range is positioned below the second C3 concrete cover weight 2-2 adopts SR plastic packing for filling 11, and the other split joint of the first C25-1 in the first C25 concrete cover weight range adopts the other grid plate width 73715, the positions of asphalt grid plate joint filling 15 and SR plastic filler joint filling 11 are aligned, a vertical water stop copper sheet 16 is positioned between the SR plastic filler joint filling 11 and the asphalt grid plate joint filling 15, the bottom of a first C25 concrete cover weight 2-1 is provided with a C25 concrete tooth wall 3, the C25 concrete tooth wall 3 is positioned at the joint of the SR plastic filler joint filling 11 and the asphalt grid plate joint filling 15, the bottom end of the vertical water stop copper sheet 16 is connected with the C25 concrete tooth wall 3, a curtain grouting column 4 is arranged below the first C25 concrete cover weight 2-1, and the curtain grouting column 4 sequentially penetrates through strong weathered sandstone 12 and slightly weathered sandstone 13. The concrete cover comprises a first C25 concrete cover body, a second C25 concrete cover body, a C25 concrete tooth wall 3 and a third C25 concrete cover body, wherein the first C25 concrete cover body is provided with a plurality of groups of parting in the width range of 2-1, the second C25 concrete cover body is provided with a plurality of groups of parting in the width direction of 2-2, the first C25 concrete cover body is aligned with the second C25 concrete cover body in the width range of 2-2, and the C25 concrete tooth wall 3 is provided with a plurality of groups of parting.
As a preferred embodiment, the composite geomembrane 7 is a composition of a polymer film and a needle-punched geotextile which are pressed together by heating or bonded by an adhesive. The needle-punched geotextile can protect polymer films from being punctured by pebbles or broken stones contacted with the polymer films, being crushed by people and machinery during laying, being damaged during transportation and the like; meanwhile, the needle-punched geotextile can play a role of a drainage layer, and after the permeable water or pore water is drained out of the composite geomembrane 7, the composite geomembrane 7 can be prevented from being lifted by water or air to be unstable and the drainage consolidation of soft soil below the composite geomembrane 7 can be accelerated; in addition, the needle-punched geotextile can also improve the friction coefficient of the contact surface with sand and pebbles. The parameters for the composite geomembrane 7 were 400g/0.6mm/400g (needle-punched geotextile/polymer film/needle-punched geotextile).
Preferably, the composite geomembrane 7 is a High Density Polyethylene (HDPE) geomembrane. The polymer film is a high-density polyethylene (HDPE) film, the lowest site construction temperature is-18 ℃, and the lowest site bonding temperature is 1O ℃. The strength requirements of the soil composite geomembrane 7 are that the nominal breaking strength is more than or equal to 12KN/m, the longitudinal and transverse breaking strength is more than 12KN/m, the CBR bursting strength is more than 2.2KN, and the longitudinal and transverse tearing strength is more than 0.4 KN.
Preferably, the fine gravel layer 6 needs to be compacted, has the thickness of 15cm and the particle size of 2-10 mm; a macadam cushion layer with the thickness of 10 cm; the cast-in-situ C25 concrete panel has a thickness of 12cm and a particle size of 10-20 mm.
The cast-in-situ C25 concrete panel 9 can prevent wave brushing, sand erosion, damage to people and animals, freezing damage, ultraviolet radiation, wind lifting, and water pressure jacking and floating under the film.
The fine gravel layer 6 can make the composite geomembrane 7 uniformly stressed, prevent the geomembrane from being damaged by locally concentrated stress, and has the functions of water drainage and air exhaust.
A plurality of drain pipes 5 are sequentially arranged on the upstream dam slope 1 along the width direction, and each drain pipe 5 penetrates through the cast-in-situ C25 concrete panel 9 and extends into the gravel cushion 8. The drain pipe 5 can prevent the geomembrane from being damaged by water and gas cap holders, and has the specification of DN 80-DN 150.
The composite geomembrane 7 at the toe of the upstream dam slope 1 is pressed between the first C25 concrete cover weight 2-1 and the second C25 concrete cover weight 2-2 and is anchored by a geomembrane anchoring part 14, so that the connection tightness of the composite geomembrane 7 can be ensured; the first C25 concrete cover weight 2-1 provides an operation platform for the curtain grouting column 4, and SR plastic packing 11, vertical water stop copper sheets 16, C25 concrete tooth walls 3 and other structures are adopted at the parting of the C25 concrete cover weight 2, so that water can be effectively blocked from entering the dam, the leakage of the reservoir dam can be reduced to the maximum extent, and the problem of leakage of the reservoir dam is solved.
The grouting material of the curtain grouting column 4 adopts common silicate cement grout, and the cement strength grade is not lower than 42.5 grade. The slurry-to-water-to-cement ratio is 3: 1 or 2:1 or 1:1 or 0.8:1 or 0.6:1 (by weight). The SGB6-10 grouting pump is adopted, the allowable working pressure is more than 1.5 times of the maximum grouting pressure, and the sufficient grouting amount and the stable working performance are realized. Equipped with a JIS-2B vertical double-layer stirring barrel. And sealing the grouting holes after the full-hole grouting of each grouting hole is finished and the qualified grouting holes are checked and accepted. The curtain grouting column is sealed by adopting a sectional pressure grouting sealing method, so that the curtain grouting column 4 is formed.
The permeability of the slightly weathered sandstone 13 is less than 10Lu, and when the permeability of the slightly weathered sandstone 13 is more than 10Lu, the curtain grouting column 4 extends to 0.5m below a 10Lu line.
It should be noted that the specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments, or alternatives may be employed, by those skilled in the art, without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (9)
1. An anti-seepage structure of a small reservoir dam body comprises an earth-rock mixed dam (17), and is characterized in that the waterside of the earth-rock mixed dam (17) is an upstream dam slope (1), a fine gravel layer (6), a composite geomembrane (7), a gravel cushion layer (8) and a cast-in-situ C25 concrete panel (9) are sequentially arranged on the slope surface of the upstream dam slope (1) from bottom to top,
the C25 concrete cover weight (2) is arranged at the toe of the upstream dam slope (1), the C25 concrete cover weight (2) comprises a first C25 concrete cover weight (2-1) and a second C25 concrete cover weight (2-2), a second C25 concrete cover weight (2-2) is arranged at the upper part of one side, close to the toe of the upstream dam slope (1), of the first C25 concrete cover weight (2-1), the composite geomembrane (7) is pressed between the first C25 concrete cover weight (2-1) and the second C25 concrete cover weight (2-2), the geomembrane anchor piece (14) sequentially penetrates through the second C25 concrete cover weight (2-2), the composite geomembrane (7) and the first C25 concrete cover weight (2-1) from top to bottom to perform anchoring, the partial seam in the width direction of the second C25 concrete cover weight (2-2) adopts SR plastic filling material (11), and the partial seam in the range of the first C25 concrete cover weight (2-1) is positioned below the SR 462-2 partial seam of the second C462 filling material (52-2) in the width direction 11) The other part of the seam in the width range of the first C25 concrete cover weight (2-1) adopts asphalt grid plate seam filling (15), the positions of the asphalt grid plate seam filling (15) and SR plastic filler seam filling (11) are aligned, a vertical water stop copper sheet (16) is positioned between the SR plastic filler seam filling (11) and the asphalt grid plate seam filling (15), a C25 concrete tooth wall (3) is arranged at the bottom of the first C25 concrete cover weight (2-1), the bottom end of the vertical water stop copper sheet (16) is connected with the C25 concrete tooth wall (3), a curtain grouting column (4) is arranged below the first C25 concrete cover weight (2-1), and the curtain grouting column (4) sequentially penetrates through strongly weathered sandstone (12) and micro weathered sandstone (13).
2. The seepage control structure for the small reservoir dam according to claim 1, wherein the composite geomembrane (7) is a polyethylene geotextile film.
3. The seepage control structure of the small reservoir dam body as claimed in claim 2, wherein the nominal rupture strength of the composite geomembrane (7) is more than or equal to 12KN/m, the longitudinal and transverse rupture strength is more than 12KN/m, the CBR bursting strength is more than 2.2KN, and the longitudinal and transverse tearing strength is more than 0.4 KN.
4. The seepage control structure of the small reservoir dam body as claimed in claim 1, wherein the thickness of the fine gravel layer (6) is 15cm, the thickness of the gravel cushion layer (8) is 10cm, and the thickness of the cast-in-situ C25 concrete panel (9) is 12 cm.
5. The seepage-proofing structure of the small reservoir dam body according to claim 1, wherein a plurality of drain pipes (5) are sequentially arranged on the upstream dam slope (1) along the width direction, and each drain pipe (5) penetrates through a cast-in-situ C25 concrete panel (9) and extends into a gravel cushion layer (8).
6. The seepage prevention structure for the small reservoir dam body as claimed in claim 5, wherein the pipe diameter of the drain pipe (5) is DN 80-DN 150.
7. The seepage control structure of the dam body of the small reservoir as claimed in claim 1, wherein the grouting material of the curtain grouting column (4) is portland cement slurry, and the strength grade of the portland cement is not lower than 42.5.
8. The impervious structure of small-sized reservoir dams of claim 7, wherein the water-cement weight ratio of said portland cement slurry is 3: 1 or 2:1 or 1:1 or 0.8:1 or 0.6: 1.
9. The seepage control structure for the small reservoir dam according to claim 7, wherein the permeability of the slightly weathered sandstone (13) is less than 10 Lu.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210579401.1A CN114753313B (en) | 2022-05-25 | 2022-05-25 | Small-size reservoir dam body seepage prevention structure |
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| CN202210579401.1A CN114753313B (en) | 2022-05-25 | 2022-05-25 | Small-size reservoir dam body seepage prevention structure |
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| CN114753313A true CN114753313A (en) | 2022-07-15 |
| CN114753313B CN114753313B (en) | 2023-06-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115369818A (en) * | 2022-07-19 | 2022-11-22 | 中国电建集团华东勘测设计研究院有限公司 | Warehouse bank mask anti-seepage structure with foundation uplift pressure monitoring and emergency pressure relief device and construction method |
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Cited By (2)
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| CN115369818A (en) * | 2022-07-19 | 2022-11-22 | 中国电建集团华东勘测设计研究院有限公司 | Warehouse bank mask anti-seepage structure with foundation uplift pressure monitoring and emergency pressure relief device and construction method |
| CN115369818B (en) * | 2022-07-19 | 2024-04-26 | 中国电建集团华东勘测设计研究院有限公司 | Reservoir bank mask seepage-proofing structure with foundation lifting pressure monitoring and emergency pressure relief device and construction method |
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| Publication number | Publication date |
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| CN114753313B (en) | 2023-06-02 |
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