CN212000904U - Mixed seepage-proofing dam - Google Patents
Mixed seepage-proofing dam Download PDFInfo
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- CN212000904U CN212000904U CN201922441511.8U CN201922441511U CN212000904U CN 212000904 U CN212000904 U CN 212000904U CN 201922441511 U CN201922441511 U CN 201922441511U CN 212000904 U CN212000904 U CN 212000904U
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Abstract
The utility model discloses a mix impervious dam, including upper reaches lower part rockfill material, low reaches lower part rockfill material, upper reaches upper portion rockfill material, low reaches upper portion rockfill material, dry masonry bank protection, transition material, bituminous concrete core, concrete foundation, curtain grout, wave wall, set up the bituminous concrete core in the transition material that lies in upper reaches lower part rockfill material and low reaches lower part rockfill material, set up the high muscle geomembrane and replace the bituminous concrete core in the transition material of upper reaches upper portion rockfill material and low reaches upper portion rockfill material. The upper half part of the traditional asphalt concrete core dam is changed into a high-strength reinforced polyethylene geomembrane type, and the impermeability of the geomembrane is utilized to play a role in seepage prevention. The upstream and downstream rockfill materials adopt the rockfill materials with larger deformation modulus. The dam body has simple type, higher construction speed, lower requirement on upstream and downstream rockfill materials, and better popularization value for projects with insufficient dam building materials in dam site areas.
Description
Technical Field
The utility model relates to an anti-seepage dam, especially a mix anti-seepage dam.
Background
As shown in fig. 1, a bituminous concrete core dam is a common type of local material dam. The earth and rockfill dam is characterized in that an asphalt concrete core wall is arranged in a dam body to serve as an anti-seepage body. The asphalt concrete has good anti-seepage performance and deformation adaptability. When the position near the dam is lack of natural impervious materials, asphalt concrete can be used as the impervious core wall of the earth-rock dam, and the dam shells on the two sides can be made of various pervious and semi-pervious sand-rock materials or rockfill. It has many advantages: the construction method is less influenced by external climate and illumination, almost not influenced by cool summer and severe cold and freezing, the paving and compaction of the asphalt concrete are simpler than the construction of the anti-seepage panel in the panel rock-fill dam, meanwhile, the asphalt concrete is easy to be connected with the riverbed and the concrete bases at two banks, the work load of curtain grouting is less than that of the panel rock-fill dam, and the anti-explosion and anti-seismic performance is better than that of the panel rock-fill dam.
However, asphalt concrete core dams also have the following disadvantages: the stress is complex: when water is retained, the asphalt core wall is subjected to horizontal thrust, and is influenced by additional vertical load when the dam body is settled, the stress state is complex, the asphalt core wall is damaged and damaged frequently, and the dam body leaks, and the condition is easy to happen particularly when the materials of upstream and downstream rockfill areas of dam body filling materials are different; maintenance difficulty: the asphalt concrete core impervious body is buried in the dam body of the earth-rock dam for a long time and is supported by the filling of the dam body, so the overhaul condition is quite difficult, even the overhaul condition does not exist. And thirdly, the filling amount of the dam body is large: the stress center of gravity of the asphalt concrete core wall dam is mainly concentrated on a downstream dam body, and the dam slope requirement is low, so that the filling material of the dam body is larger than that of a concrete faced rock-fill dam.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a mix impervious dam is provided, with the high muscle polyethylene geomembrane of forcing of the first half embedding of traditional asphalt concrete core dam, utilize the imperviousness of geomembrane to play the prevention of seepage effect.
In order to solve the technical problem, the utility model discloses a technical scheme is: a mixed seepage-proofing dam comprises an upstream lower part rockfill, a downstream lower part rockfill, an upstream upper part rockfill, a downstream upper part rockfill, a dry masonry slope protection, a transition material, an asphalt concrete core wall, a concrete base, curtain grouting and a wave wall, wherein the asphalt concrete core wall is arranged in the transition material of the upstream lower part rockfill and the downstream lower part rockfill, and a high-strength reinforced geomembrane is arranged in the transition material of the upstream upper part rockfill and the downstream upper part rockfill to replace the asphalt concrete core wall.
The upstream upper rockfill material adopts rockfill material with large deformation modulus.
The upper-stream lower rockfill is positioned below a normal water level, and the top elevation of the rockfill is within the range of 1/3-1/2 of the total dam height.
At the same elevation, the rockfill materials on the two downstream sides of the asphalt concrete core wall have the same properties.
The high-strength reinforced geomembrane is made of high-strength reinforced polyethylene geomembrane, the nominal thickness of the geomembrane is more than or equal to 3.0mm, and the density is more than or equal to 0.94g/cm3The longitudinal and transverse tensile yield strength is more than or equal to 40N/mm, the longitudinal and transverse tensile breaking strength is more than or equal to 60N/mm, the longitudinal and transverse yield elongation is more than or equal to 11%, the longitudinal and transverse breaking elongation is more than or equal to 600%, the longitudinal and transverse right-angle tearing load is more than or equal to 340N, the puncture resistance strength is more than or equal to 720N, the water vapor permeability coefficient is less than or equal to 1 x 10-13cm/s。
The bottom of the high-strength reinforced geomembrane extends into the position below the boundary line between the upstream lower rockfill material and the downstream lower rockfill material and the upstream upper rockfill material and the downstream upper rockfill material, the extending length is more than or equal to 0.5m, and the top of the high-strength reinforced geomembrane is embedded into the wave wall and is more than or equal to 0.5 m.
The utility model has the advantages that: the properties of the lower rockfill material on the upstream side and the lower rockfill material on the downstream side are the same, the deformation of the dam body is consistent, the stress condition of the asphalt concrete is uniform, and the uniform stress of the asphalt concrete on the lower part is ensured; secondly, the nature of the rockfill material on the upper part of the upstream side is the same as that of the rockfill material on the upper part of the downstream side, the deformation of the dam body is consistent, the stress condition of the asphalt concrete is uniform, and the uniform stress of the asphalt concrete on the upper part is ensured; the upper part adopts the asphalt concrete embedded high-strength reinforced geomembrane for seepage prevention, the lower part adopts the asphalt concrete for seepage prevention, the horizontal thrust generated by the deformation of a dam body and the water pressure can be better adapted, and the upper part adopts the high-strength reinforced geomembrane, so that the deformation adapting capability is strong, and the seepage prevention performance is improved. Fourthly, the upper rockfill area of the dam shape adopts a damming material with lower strength, so that the excavated materials can be fully utilized, and the pressure of water conservation and environmental protection is reduced. And fifthly, simplifying the dam construction procedure, accelerating the construction progress and shortening the construction period.
Drawings
FIG. 1 is a typical cross-section of a conventional asphalt concrete core dam;
fig. 2 is a typical cross-sectional view of the hybrid impervious dam of the present invention.
Detailed Description
The invention will be described in further detail with reference to the following drawings and embodiments:
as shown in fig. 2, the utility model discloses a mix impervious dam, including upper reaches lower part rockfill 1, lower reaches lower part rockfill 2, upper reaches upper portion rockfill 3, lower reaches upper portion rockfill 4, dry masonry bank protection 5, transition material 6, bituminous concrete core 7, concrete foundation 8, curtain grout 9, wave wall 11, set up bituminous concrete core 7 in the transition material 6 that lies in upper reaches lower part rockfill 1 and lower reaches lower part rockfill 2, set up high-strength reinforced geomembrane 10 in the transition material 6 that lies in upper reaches upper portion rockfill 3 and lower reaches upper portion rockfill 4 and replace bituminous concrete core 7.
The upstream upper rockfill 3 is made of rockfill material having a large modulus of deformation. Such as a rockfill material with a deformation modulus of less than or equal to 150 MPa.
The upper-stream lower rockfill 1 is located below a normal water level, and the top elevation of the rockfill is within the range of 1/3-1/2 of the total dam height.
At the same elevation, the rockfill material on both sides of the upstream and downstream of the asphalt concrete core 7 has the same properties.
The high-strength reinforced geomembrane 10 is made of high-strength reinforced polyethylene geomembrane, the nominal thickness of the geomembrane is more than or equal to 3.0mm, and the density is more than or equal to 0.94g/cm3The longitudinal and transverse tensile yield strength is more than or equal to 40N/mm, the longitudinal and transverse tensile breaking strength is more than or equal to 60N/mm, the longitudinal and transverse yield elongation is more than or equal to 11%, the longitudinal and transverse breaking elongation is more than or equal to 600%, the longitudinal and transverse right-angle tearing load is more than or equal to 340N, the puncture resistance strength is more than or equal to 720N, the water vapor permeability coefficient is less than or equal to 1 x 10-13cm/s。
The bottom of the high-strength reinforced geomembrane 10 extends into the lower part of the boundary line between the upper part of the rockfill 1 and the lower part of the boundary line between the lower part of the rockfill 2 and the upper part of the boundary line between the upper part of the rockfill 3 and the upper part of the boundary line between the lower part of the boundary line and the lower part of the rockfill 4, the extending length is more than or equal to 0.5m, the top of the high-strength reinforced geomembrane 10 is embedded into the wave wall.
Specifically, the bottom of the geomembrane extends into the boundary between the rockfill materials (1 and 2) and the rockfill materials (3 and 4) and the extending length is more than or equal to 0.5 m. The top of the geomembrane is required to extend into the upstream wave wall 11, and the extending length is more than or equal to 0.5 m.
In the present embodiment, after the dam foundation is excavated, the dam foundation seepage-proofing construction is first performed, and it is preferably performed before asphalt concrete construction except for curtain grouting that can be performed in the gallery. And then, constructing a concrete base, after the construction of the concrete base is finished, constructing the lower half part of the dam body, synchronously lifting the core wall and the transition material and the dam shell material, wherein the difference between the filling height of the core wall and the adjacent dam shell material is not more than 800mm, when the construction is carried out to be 0.5-1.0 m away from the cross-connecting line of the upper filling material and the lower filling material, embedding the high-strength reinforced geomembrane 10, then, filling the upper half part of the dam body, and simultaneously lifting the transition material 6, the dam shell materials (1, 2, 3 and 4) and the geomembrane 10, and finally, constructing the top wave wall 11 and the dam top highway, wherein the construction needs to ensure that the high-strength reinforced geomembrane 10 extends into the wave wall 11 for a length of more than or equal to 0.5m, and adopts a lap joint mode in the axial direction of the dam if a plurality of geomembranes are needed, and the lap joint length of more than or equal to 1 m.
The above-mentioned examples are only for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the same, and the scope of the present invention should not be limited by the examples, i.e. all equivalent changes or modifications made by the spirit of the present invention are still within the scope of the present invention.
Claims (6)
1. The utility model provides a mix impervious dam, includes upper reaches lower part rockfill (1), lower reaches lower part rockfill (2), upper reaches upper portion rockfill (3), lower reaches upper portion rockfill (4), dry masonry bank protection (5), transition material (6), bituminous concrete core (7), concrete foundation (8), curtain grout (9) and wave wall (11), its characterized in that sets up bituminous concrete core (7) in transition material (6) that lie in upper reaches lower part rockfill (1) and lower reaches lower part rockfill (2), sets up high-strength reinforcement geomembrane (10) and replaces bituminous concrete core (7) in transition material (6) that lie in upper reaches upper portion rockfill (3) and lower reaches upper portion rockfill (4).
2. Hybrid impermeable dam according to claim 1, characterised in that the upstream upper rockfill material (3) is a rockfill material with a high modulus of deformation.
3. The hybrid impervious dam according to claim 1, characterized in that said upstream lower rockfill material (1) is located below the normal water level and has a top elevation within the range of 1/3 to 1/2 of the total dam height.
4. Hybrid impermeable dam according to claim 1, characterised in that the rockfill material on both the upstream and downstream sides of the bituminous concrete core (7) is of the same nature at the same elevation.
5. According to claimThe mixed seepage-proofing dam of claim 1 is characterized in that the high-strength reinforced geomembrane (10) is made of a high-strength reinforced polyethylene geomembrane, the nominal thickness of the geomembrane is more than or equal to 3.0mm, and the density is more than or equal to 0.94g/cm3The longitudinal and transverse tensile yield strength is more than or equal to 40N/mm, the longitudinal and transverse tensile breaking strength is more than or equal to 60N/mm, the longitudinal and transverse yield elongation is more than or equal to 11%, the longitudinal and transverse breaking elongation is more than or equal to 600%, the longitudinal and transverse right-angle tearing load is more than or equal to 340N, the puncture resistance strength is more than or equal to 720N, the water vapor permeability coefficient is less than or equal to 1 x 10-13cm/s。
6. The hybrid impermeable dam according to claim 1, characterized in that the bottom of the high-strength reinforced geomembrane (10) extends into the lower part of the upstream lower rockfill (1) and the lower part of the downstream lower rockfill (2) and the boundary of the upper part of the upstream rockfill (3) and the upper part of the downstream rockfill (4) for a length of more than or equal to 0.5m, and the top of the high-strength reinforced geomembrane (10) is embedded into the wave wall (11) for a length of more than or equal to 0.5 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922441511.8U CN212000904U (en) | 2019-12-27 | 2019-12-27 | Mixed seepage-proofing dam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922441511.8U CN212000904U (en) | 2019-12-27 | 2019-12-27 | Mixed seepage-proofing dam |
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| CN212000904U true CN212000904U (en) | 2020-11-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110939104A (en) * | 2019-12-27 | 2020-03-31 | 中水北方勘测设计研究有限责任公司 | Mixed seepage-proofing dam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110939104A (en) * | 2019-12-27 | 2020-03-31 | 中水北方勘测设计研究有限责任公司 | Mixed seepage-proofing dam |
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