CN220394428U - Combined seepage-proofing structure for dam foundation strong water-permeable bad foundation treatment - Google Patents
Combined seepage-proofing structure for dam foundation strong water-permeable bad foundation treatment Download PDFInfo
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- CN220394428U CN220394428U CN202321792319.3U CN202321792319U CN220394428U CN 220394428 U CN220394428 U CN 220394428U CN 202321792319 U CN202321792319 U CN 202321792319U CN 220394428 U CN220394428 U CN 220394428U
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- dam
- curtain
- foundation
- asphalt
- grouting
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- 239000011384 asphalt concrete Substances 0.000 claims abstract description 41
- 239000010426 asphalt Substances 0.000 claims abstract description 33
- 230000005484 gravity Effects 0.000 claims abstract description 22
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000002265 prevention Effects 0.000 claims description 8
- 230000035699 permeability Effects 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000010276 construction Methods 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 2
- 238000009933 burial Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The utility model discloses a combined seepage-proofing structure for dam foundation strong water-permeable bad foundation treatment, which comprises a grouting curtain, an asphalt pool and an asphalt concrete slab, wherein the grouting curtain is positioned at the upstream of a gravity dam and stretches into bad geology, the asphalt pool is positioned at the upper part of the grouting curtain, and the asphalt concrete slab is arranged at the upper part of the grouting curtain and wraps the asphalt pool. According to the grouting curtain, the asphalt pool and the asphalt concrete slab, the grouting curtain, the asphalt pool and the asphalt concrete slab are combined, so that a seepage channel can be thoroughly blocked, the seepage pressure is effectively reduced, and the seepage flow is reduced.
Description
Technical Field
The utility model relates to the field of gravity dam seepage prevention, in particular to a combined seepage prevention structure for treating a strong water-permeable poor foundation of a dam foundation.
Background
With the rapid development of dam construction in China, the geological conditions of the gravity dam foundation are increasingly complex, and the treatment cost is also higher. And because of insufficient exploration or insufficient excavation cost, local bad geologic bodies with strong water permeability can exist under the dam foundation.
When the bad geologic body is thinner, has larger burial depth and certain strength, the bad geologic body has little direct influence on deformation and stability, but has influence on seepage, and the improvement of lifting force can indirectly influence the stability along a building base surface. The weathering fracture characteristics of the bad geologic body make it show obvious plastic deformation characteristics. The dead weight in the building period causes the compression of the foundation, and the vertical pressure of the dam foundation is reduced due to the action of the thrust bending moment of the reservoir water after the water storage period, but the compression deformation in the poor geological body can not be recovered, so that a low-pressure stress area (or a horizontal gap is approximately understood) is easily formed at the bottom of the dam body, a relatively concentrated seepage channel is easily formed, and the lifting force and the anti-skid stability are further deteriorated.
Because the bad geologic body has larger burial depth and certain strength, the excavation cost is high and the effect is poor. Reinforcing seepage prevention is a good means for solving the problems, and a common seepage prevention means at present is to arrange a curtain below a gallery at a dam heel. However, under such geological conditions, only the curtain in the gallery cannot thoroughly block the leakage path, and the dam foundation high-pressure water possibly bypasses the transverse seam from the dam foundation through the bad geological body to stop water, and then enters the gallery along the transverse seam, so that potential safety hazards are brought.
Therefore, there is a need to solve the above-mentioned problems.
Disclosure of Invention
The utility model aims to: the utility model aims to provide a combined seepage-proofing structure for dam foundation strong water-permeable bad foundation treatment, which can effectively reduce the osmotic pressure and reduce the osmotic flow.
The technical scheme is as follows: in order to achieve the above purpose, the utility model discloses a combined seepage prevention structure for dam foundation strong water permeability bad foundation treatment, which comprises a grouting curtain, an asphalt pool and an asphalt concrete slab, wherein the grouting curtain is positioned at the upstream of a gravity dam and stretches into a bad geological body, the asphalt pool is positioned at the upper part of the grouting curtain, and the asphalt concrete slab is arranged at the upper part of the grouting curtain and wraps the asphalt pool.
Wherein, the grouting curtain is positioned at the position 2-3 m away from the dam heel at the upstream of the gravity dam.
Preferably, the grouting curtain stretches into the bad geological body for at least 5-10 m.
And the two sides of the grouting curtain exceed the bad geological body by at least 5-10 m along the axial direction of the dam.
Further, two rows of curtain grouting holes are arranged on the grouting curtain.
Preferably, the pitch of the curtain grouting holes is 1.5-4 m.
Furthermore, the row spacing of the two rows of curtain grouting holes is smaller than the hole spacing of the curtain grouting holes.
Further, the asphalt pool comprises an asphalt concrete enclosure and asphalt filled in the asphalt concrete enclosure.
Preferably, the lower part of the asphalt is connected with the curtain grouting holes through dowel bars.
Furthermore, the joint of the asphalt concrete slab and the dam heel of the gravity dam is provided with a reinforcing part with a triangular upper side.
The beneficial effects are that: compared with the prior art, the utility model has the following advantages:
(1) According to the utility model, the grouting curtain, the asphalt pool and the asphalt concrete slab are combined, so that a seepage channel can be thoroughly blocked, the seepage pressure is effectively reduced, and the seepage flow is reduced;
(2) According to the gravity dam, before and after water storage, the dam heel stress is converted from compressive stress to tensile stress, the foundation can be greatly deformed, asphalt concrete is high in flexibility, the gravity dam can be well adapted to foundation deformation, and the contact part of asphalt concrete plates and the gravity dam can not be separated to form a new leakage channel;
(3) The utility model has simple structure, the whole seepage-proofing structure is outside the dam body, and the whole seepage-proofing structure is not in conflict with the dam body construction, so that the construction period can be saved synchronously.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a top view of the present utility model;
FIG. 3 is an enlarged view of the permeation resistant structure of the present utility model;
FIG. 4 is an enlarged view of the bitumen pool of the present utility model;
marked in the figure as: poor geologic body 1, grout curtain 2, asphalt concrete slab 3, pitch pool 4, curtain grout hole 5, gravity dam 6, dowel bar 7, asphalt concrete enclosure 8, pitch 9.
Detailed Description
The technical scheme of the utility model is further described below with reference to the accompanying drawings.
As shown in figures 1 and 2, the combined seepage prevention structure for dam foundation strong water permeability bad foundation treatment comprises a grouting curtain 2, an asphalt pool 4 and asphalt concrete plates 3, wherein the grouting curtain 2 is positioned at the upstream of a gravity dam 6, the grouting curtain 2 stretches into a bad geologic body 1, the grouting curtain 2 is positioned at the position 2-3 m away from a dam heel at the upstream of the gravity dam 6, the grouting curtain 2 stretches into the bad geologic body by at least 5-10 m, and two sides of the grouting curtain 2 exceed the bad geologic body by at least 5-10 m along the axial direction of the dam. Two rows of curtain grouting holes 5 are arranged on the grouting curtain 2, the pitch of the curtain grouting holes 5 is 1.5-4 m, and the pitch of the two rows of curtain grouting holes 5 is smaller than that of the curtain grouting holes 5. According to the grouting curtain, the asphalt pool and the asphalt concrete slab, the grouting curtain, the asphalt pool and the asphalt concrete slab are combined, so that a seepage channel can be thoroughly blocked, the seepage pressure is effectively reduced, and the seepage flow is reduced.
The asphalt pool 4 is positioned at the upper part of the grouting curtain, the asphalt pool 4 comprises an asphalt concrete enclosing wall 8 and asphalt 9 filled in the asphalt concrete enclosing wall, and the lower part of the asphalt 9 is connected with the curtain grouting holes 5 through the dowel bars 7.
The asphalt concrete plate 3 is arranged on the upper part of the grouting curtain 2 and wraps the asphalt pool 4, and a reinforcing part with a triangular upper side is arranged at the joint part of the asphalt concrete plate 3 and the dam heel of the gravity dam 6.
As shown in fig. 1 and 3, the combined impervious structure comprises three parts of a grouting curtain 2, an asphalt concrete slab 3 and an asphalt pool 4, wherein the grouting curtain 2 is arranged in front of a gravity dam, the asphalt pool 4 is arranged on the upper part of the grouting curtain 2, and the asphalt concrete slab 3 is arranged on the upper part of the grouting curtain 2 to wrap the asphalt pool 4.
Firstly, arranging equipment at the position 2-3 m away from the dam heel on the upstream of the gravity dam to drill holes, and adopting two rows of curtain grouting holes 5 due to poor geological conditions and poor geological conditions of the poor geological bodies 1 of the dam foundation. The distance between the curtain grouting holes 5 is 1.5-4 m, the row distance is slightly smaller than the hole distance, the curtain depth is determined according to the actual situation, but the curtain is ensured to extend into the bad geological body by at least 5-10 m. Along the axial direction of the dam, the curtain is required to ensure that the two sides of the curtain exceed the bad geological body by at least 5-10 m. And (5) performing quality inspection after grouting, and sealing holes after the quality inspection reaches the standard.
As shown in fig. 4, after hole sealing is completed, an asphalt concrete enclosure 8 is poured on the periphery of the curtain grouting hole 5, the height of the asphalt concrete enclosure 8 is 0.5m, the thickness of the asphalt concrete enclosure 8 is 0.5m, the top of the curtain grouting hole 5 is chiseled after pouring is completed, a top dowel 7 is planted, asphalt 9 is poured inside the asphalt concrete enclosure 8 after the dowel is completed, the asphalt 9 is poured to be the same height as the asphalt concrete enclosure 8, and the lower part of the asphalt 9 is connected with the curtain grouting hole 5 through the dowel 7.
After the construction of the asphalt pool 4 is completed, the asphalt concrete slab 3 begins to be laid. The asphalt concrete slab 3 can be laid continuously, and no transverse seam is required to be arranged along the axial direction of the dam. Because asphalt concrete has high flexibility in the upstream and downstream directions perpendicular to the axis of the dam, the asphalt concrete can be well adapted to foundation deformation, one side of the asphalt concrete is directly poured to the dam heel to be attached to the dam heel, and the other side of the asphalt concrete is poured to the distance curtain grouting holes by 10-15 m, so that the whole concrete slab has a certain length, and a good seepage prevention effect can be achieved.
The asphalt concrete slab 3 is a horizontal plate as a whole, pouring is simple, the thickness is 1-2 m, the upper side of a reinforcing part at the joint is triangular, and the length of the triangular part is 1m and the thickness is 1m at the contact position of the gravity dam 6 and the dam heel to better adapt to foundation deformation. The whole seepage-proofing structure is arranged outside the dam body, and can be synchronously carried out along with the construction of the dam body, so that the construction period is saved. The gravity dam of the utility model changes the dam heel stress from compressive stress to tensile stress before and after water storage, the foundation can generate larger deformation, the asphalt concrete has large flexibility, the gravity dam can be well adapted to the deformation of the foundation, and the contact part of the asphalt concrete slab and the gravity dam can not be separated to form a new leakage channel.
Claims (10)
1. A dam foundation strong permeable bad foundation treatment's combination seepage prevention structure which characterized in that: the device comprises a grouting curtain (2) which is positioned at the upstream of a gravity dam (6) and stretches into a bad geological body (1), an asphalt pool (4) which is positioned at the upper part of the grouting curtain, and an asphalt concrete slab (3) which is arranged at the upper part of the grouting curtain and wraps the asphalt pool.
2. The combined seepage-proofing structure for dam foundation strong water-permeable bad foundation treatment according to claim 1, wherein: the grouting curtain (2) is positioned at the position 2-3 m away from the dam heel at the upstream of the gravity dam.
3. The combined seepage-proofing structure for dam foundation strong water-permeable bad foundation treatment according to claim 1, wherein: the grouting curtain (2) stretches into the bad geological body for at least 5-10 m.
4. The combined seepage-proofing structure for dam foundation strong water-permeable bad foundation treatment according to claim 1, wherein: and grouting two sides of the curtain (2) along the axial direction of the dam at least 5-10 m beyond the bad geological body.
5. The combined seepage-proofing structure for dam foundation strong water-permeable bad foundation treatment according to claim 1, wherein: two rows of curtain grouting holes (5) are formed in the grouting curtain (2).
6. The combined seepage-proofing structure for dam foundation strong water permeability poor foundation treatment according to claim 5, wherein the combined seepage-proofing structure comprises the following components: the hole distance of the curtain grouting holes (5) is 1.5-4 m.
7. The combined seepage-proofing structure for dam foundation strong water permeability poor foundation treatment according to claim 5, wherein the combined seepage-proofing structure comprises the following components: the row distance of the two rows of curtain grouting holes (5) is smaller than the hole distance of the curtain grouting holes (5).
8. The combined seepage-proofing structure for dam foundation strong water-permeable bad foundation treatment according to claim 1, wherein: the asphalt pool (4) comprises an asphalt concrete enclosing wall (8) and asphalt (9) filled in the asphalt concrete enclosing wall.
9. The combined seepage-proofing structure for dam foundation strong water-permeable bad foundation treatment according to claim 8, wherein: the lower part of the asphalt (9) is connected with the curtain grouting holes (5) through the dowel bars (7).
10. The combined seepage-proofing structure for dam foundation strong water-permeable bad foundation treatment according to claim 1, wherein: the joint of the asphalt concrete plate (3) and the dam heel of the gravity dam (6) is provided with a reinforcing part with a triangular upper side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321792319.3U CN220394428U (en) | 2023-07-10 | 2023-07-10 | Combined seepage-proofing structure for dam foundation strong water-permeable bad foundation treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321792319.3U CN220394428U (en) | 2023-07-10 | 2023-07-10 | Combined seepage-proofing structure for dam foundation strong water-permeable bad foundation treatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220394428U true CN220394428U (en) | 2024-01-26 |
Family
ID=89605167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321792319.3U Active CN220394428U (en) | 2023-07-10 | 2023-07-10 | Combined seepage-proofing structure for dam foundation strong water-permeable bad foundation treatment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220394428U (en) |
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2023
- 2023-07-10 CN CN202321792319.3U patent/CN220394428U/en active Active
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