CN114197403A - Elevation and extension seepage-proofing system for grouted stone gravity dam and construction method - Google Patents
Elevation and extension seepage-proofing system for grouted stone gravity dam and construction method Download PDFInfo
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- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
- E02B7/08—Wall dams
- E02B7/10—Gravity dams, i.e. those in which the weight of the structure prevents overturning
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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Abstract
The invention relates to the technical field of water conservancy facilities, in particular to a grouted stone gravity dam heightening and expanding seepage-proofing system and a construction method. The system comprises a new dam body which is built on the back surface and the top of the old dam body, a curtain grouting part which is reinforced under the dam foundation of the old dam body, and a filling grouting part which is arranged in the old dam body, wherein the filling grouting part is arranged along the axis of the old dam body and extends to the bottom of the dam foundation of the old dam body, a concrete impervious wall is arranged in the new dam body which is positioned at the top of the old dam body, and the new dam body is connected with the old dam body through expansive concrete. The invention can form effective heightening extension reinforcement on the dam body, enhance the structural strength and the seepage-proofing performance of the dam body and efficiently solve the problems of the flooding and seepage safety of the dam body.
Description
Technical Field
The invention relates to the technical field of water conservancy facilities, in particular to a grouted stone gravity dam heightening and expanding seepage-proofing system and a construction method.
Background
Dams are generally water retaining structures that intercept the water flow of river channels to raise the water level or regulate the flow. The water reservoir can be formed to raise the water level, regulate runoff and concentrate water head, and is mainly used for flood control, water supply, irrigation, hydroelectric power generation, shipping improvement and the like. The dam is in the use, and rivers can constantly impact the dam body, and dam body soil and stone material shear strength under the continuous seepage rivers effect reduces, and the dam foundation takes place inhomogeneous settlement, local settlement and punching shear destruction easily, for deformation destruction, and then makes the easy seepage phenomenon that appears in dam, can take place to collapse even when the seepage is serious to cause a series of calamities easily, there is the potential safety hazard, and current mode that is used for carrying out the prevention of seepage to the dam mainly carries out the prevention of seepage through the asphalt concrete panel.
The grouted stone gravity dam is one kind of dam, and is a large-volume water retaining building built by grouted stones, and the basic section of the dam is triangular, and the whole dam is composed of a plurality of dam sections. The gravity dam meets the stability requirement mainly by means of the anti-sliding force generated by the self weight of the dam body under the action of water pressure and other loads; meanwhile, the tensile stress caused by the water pressure is counteracted by the pressure generated by the self weight of the dam body so as to meet the strength requirement. Therefore, the gravity dam must meet stability and strength requirements under the action of water pressure and other loads. In the long-term use process of the grouted stone gravity dam, the problems of loose immersion, local foundation leakage and the like easily exist in the dam body, and the existing seepage-proofing means cannot effectively solve the seepage problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a heightening and expanding seepage-proofing system and a construction method for a grouted stone gravity dam.
The technical scheme adopted by the invention is as follows:
the utility model provides a grout stone gravity dam increases high extension seepage prevention system, is including laying the new dam body of locating old dam body dorsal surface and crest, and the reinforcement is in the curtain grout portion under the old dam body dam foundation to and set up the internal filling grout portion of old dam, the axis setting of filling grout portion along old dam body to extend to under the old dam body dam foundation, be located the new dam body at old dam body crest and be equipped with the concrete impervious wall, be connected through the expanded concrete between new dam body and the old dam body.
Based on the technical content, the curtain grouting part is reinforced under the dam foundation of the old dam body, the filling grouting part is arranged in the old dam body along the axis of the dam body, the new dam body is built on the back surface and the top of the old dam body, the concrete impervious wall is arranged in the new dam body, and the expansive concrete is laid between the new dam body and the old dam body, so that the old dam body can be effectively reinforced by heightening and expanding, the structural strength and the seepage-proof performance of the dam body are enhanced, and the problems of flooding and seepage safety of the dam body are effectively solved.
In one possible design, an expansion water stop is arranged at the gap between the new dam body and the old dam body at the top of the dam. When the dam is applied, the expansion water stop strip is arranged at the gap between the new dam body and the old dam body, and the expansion water stop strip can absorb expansion when water permeates to the expansion water stop strip, so that an effective permeation and separation effect is formed on water, and the seepage-proofing performance of the dam body is improved.
In one possible design, two expansion water stop strips are arranged, wherein one strip is 0.2 +/-0.1 m away from the upstream surface of the old dam body, and the other strip is 0.4 +/-0.1 m away from the upstream surface of the old dam body. When the dam is applied, the two expansion water stop strips are arranged and correspondingly arranged at intervals, so that the permeation and blocking effects on water can be further improved, and the seepage-proofing performance of the dam body is further improved.
In one possible design, the curtain grouting part is formed by curtain grouting with the distance of 1.5m between single-row holes, and the grouting depth is 5m below a relative impervious layer of a foundation. When the waterproof curtain is applied, the curtain grouting part which is deep into the foundation and is 5m relative to the impervious layer is built by curtain grouting with the distance of 1.5m between the single row of holes at the dam foundation of the dam body, so that a continuous waterproof curtain can be formed, the seepage quantity is reduced, and the seepage pressure is reduced.
In one possible design, the filling and grouting part is formed by filling and grouting at the distance of 2.5m along the axial line of the old dam body, and the grouting depth is 3m below the contact surface of the dam foundation of the old dam body. When the filling grouting part is used, a filling grouting part with the depth of 3m is built by filling grouting with the single row hole spacing of 2.5m in the old dam body along the axis of the dam body, and lining gaps of the dam body can be filled to be tightly combined and stressed together, so that the integral resistance effect is improved, and the leakage is effectively reduced.
In one possible design, the concrete impervious wall is made of C20W6 waterproof concrete, the thickness of the concrete impervious wall is 0.3 +/-0.1 m, and the distance from the upstream face of the old dam body is 0.5 m. When the dam is applied, the C20W6 waterproof concrete is adopted to manufacture the concrete impervious wall with the thickness of 0.3 +/-0.1 m and the distance of 0.5m from the upstream face of the old dam body, so that the structural strength and the seepage-proofing performance of the new dam body can be effectively improved, and the problems of loose immersion, seepage and the like of the new dam body can be prevented.
In one possible design, the concrete impervious wall extends from the new dam body to the old dam body, and the depth of the concrete impervious wall embedded into the old dam body is 0.3 +/-0.1 m. When the concrete anti-seepage wall is applied, the concrete anti-seepage wall extends from the new dam body to the old dam body, and the embedding depth of the concrete anti-seepage wall is 0.3 +/-0.1 m, so that the new dam body and the old dam body can be further tightly matched, and the strength and the anti-seepage performance of the whole dam body are improved.
In one possible design, the expansive concrete is C25 micro expansive concrete. When the dam is applied, the C25 micro-expansion concrete can absorb moisture to expand after contacting with the permeated moisture, and the high-efficiency water-blocking and seepage-proofing effects are achieved at the joint of the new dam body and the old dam body.
In one possible design, the new dam body is built using C15 fine-stone concrete masonry blocks. When the dam is used, a new dam body built by C15 fine-stone concrete masonry barren stones is high in overall structural strength, has a good water-blocking and seepage-proofing effect and is suitable for the seepage-proofing system.
A construction method of an elevation and extension seepage-proofing system of a grouted stone gravity dam is applied to the seepage-proofing system and comprises the following steps:
punching holes at the dam foundation of the old dam body according to a set hole interval, and performing curtain grouting to generate a curtain grouting part extending to a relative impervious bed of the foundation;
punching holes at the top of the old dam body along the axis of the old dam body according to a set hole interval, filling and grouting to generate a filling and grouting part extending to the bottom of the old dam body;
and a new dam body is built along the back water surface and the dam top of the old dam body, expansion concrete is laid between the new dam body and the old dam body, a concrete impervious wall and an expansion water stop strip are built in the process of building the new dam body at the dam top, the concrete impervious wall is arranged at one side close to the upstream surface in the new dam body, and the expansion water stop strip is embedded in a gap between the new dam body and the old dam body.
The invention has the beneficial effects that:
according to the invention, the curtain grouting part is reinforced under the dam foundation of the old dam body, the filling grouting part is arranged in the old dam body along the axis of the dam body, the new dam body is built on the back surface and the top of the old dam body, the concrete impervious wall is arranged in the new dam body, and the expansive concrete is laid between the new dam body and the old dam body, so that the old dam body can be effectively heightened, expanded and reinforced, the structural strength and the seepage-proof performance of the dam body are enhanced, and the problems of flooding and seepage safety of the dam body are effectively solved.
Drawings
Reference will now be made in brief to the drawings that are needed in describing embodiments or prior art.
FIG. 1 is a schematic view of the construction of the barrier system of the present invention;
FIG. 2 is an enlarged schematic view of the junction between a new dam and an old dam;
fig. 3 is a schematic cross-sectional view of an anti-seepage system of the present invention.
In the figure: 1. old dam body; 2. a new dam body; 3. a curtain grouting part; 4. a filling and grouting part; 5. a concrete impervious wall; 6. expanding the concrete; 7. an expansion water stop bar.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Specific structural and functional details disclosed herein are merely illustrative of example embodiments of the invention. This invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.
Example 1:
the embodiment provides a grouted stone gravity dam heightening and expanding seepage-proofing system, as shown in fig. 1 to fig. 3, the system comprises a new dam body 2 which is built on the back surface and the top of an old dam body 1, a curtain grouting part 3 which is reinforced under the dam foundation of the old dam body 1, and a filling grouting part 4 which is arranged in the old dam body 1, wherein the filling grouting part 4 is arranged along the axis of the old dam body 1 and extends to the bottom of the dam foundation of the old dam body 1, a concrete seepage-proofing wall 5 is arranged in the new dam body 2 on the top of the old dam body 1, and the new dam body 2 is connected with the old dam body 1 through expansive concrete 6.
During specific implementation, the curtain grouting part 3 is reinforced under the dam foundation of the old dam body 1, the filling grouting part 4 is arranged in the old dam body 1 along the axis of the dam body, the new dam body 2 is built on the back surface and the top of the old dam body 1, the concrete impervious wall 5 is arranged in the new dam body 2, and the expansive concrete 6 is laid between the new dam body 2 and the old dam body 1, so that effective heightening and extension reinforcement can be formed on the old dam body 1, the structural strength and the seepage-proofing performance of the dam body are enhanced, and the problems of flooding and seepage safety of the dam body are effectively solved.
The expansive concrete is cement concrete prepared by expansive cement or an expansive agent, and has the characteristics of strong impermeability, early quick hardening, high later strength (or over 100MPa), good sulfate resistance and the like besides the functions of compensating shrinkage and generating self-stress. The expansive concrete is divided into two categories of compensation shrinkage concrete and self-stress concrete, wherein the expansive concrete can generate 0.2-0.7 MPa self-stress under the constraint condition due to the action of expansive cement or an expanding agent; the self-stress concrete is the concrete which can generate the self-stress of 2.0-8.0 MPa under the constraint condition due to the action of the expansion cement or the expansion agent and can be selected according to the working condition.
Furthermore, the curtain grouting part 3 is formed by curtain grouting with the distance of 1.5m between single row holes, and the grouting depth is 5m below a foundation relative impervious layer. In specific implementation, a curtain grouting part 3 which is deep into a foundation and is 5m relative to a waterproof layer is built by curtain grouting with the distance of 1.5m between the single row of holes at the dam foundation of the dam body, so that a continuous waterproof curtain can be formed, the seepage quantity is reduced, and the seepage pressure is reduced.
Further, the filling and grouting part 4 is formed by filling and grouting along the axis of the old dam body 1 at the single-row hole interval of 2.5m, and the grouting depth is 3m below the contact surface of the dam foundation of the old dam body 1. During specific implementation, the filling grouting part 4 with the depth of 3m is built by filling grouting with the single row hole spacing of 2.5m in the old dam body 1 along the axis of the dam body, so that the lining gap of the dam body can be filled, the lining gap of the dam body is tightly combined, the stress is jointly applied, the integral resistance effect is improved, and the leakage is effectively reduced.
Example 2:
as an optimization of the above embodiment, an expansion water stop 7 is arranged at the gap between the new dam body 2 and the old dam body 1 at the top of the dam. When the dam is specifically implemented, the expansion water stop strip 7 is arranged at the gap between the new dam body 2 and the old dam body 1, and when water permeates to the expansion water stop strip 7, the expansion water stop strip 7 absorbs expansion, so that an effective permeation and barrier effect is formed on the water, and the seepage-proofing performance of the dam body is improved. The expansion water stop strip is a novel building waterproof material with self-adhesive property, which is synthesized by high polymer, inorganic water-absorbing expansion material, rubber and auxiliary agent. The water can absorb water and expand in volume when meeting water, and the gaps between the new and old concrete are compacted to form waterproof plastic colloid. Has the characteristics of good weather resistance, aging resistance, seepage prevention, leakage prevention, corrosion resistance, simple and convenient operation, low cost and the like.
Furthermore, two expansion water stop bars 7 are arranged, wherein one expansion water stop bar is 0.2 +/-0.1 m away from the upstream surface of the old dam body 1, and the other expansion water stop bar is 0.4 +/-0.1 m away from the upstream surface of the old dam body 1. During specific implementation, the two expansion water stop strips 7 are arranged and correspondingly arranged at intervals, so that the permeation and blocking effects on water can be further improved, and the seepage-proofing performance of the dam body is further improved.
Example 3:
as an optimization of the above embodiment, the concrete impervious wall 5 is made of C20W6 waterproof concrete, the thickness of which is 0.3 ± 0.1m, and the distance from the upstream surface of the old dam 1 is 0.5 m. In specific implementation, the C20W6 waterproof concrete is adopted to manufacture the concrete impervious wall 5 with the thickness of 0.3 +/-0.1 m and the distance of 0.5m from the upstream surface of the old dam body 1, so that the structural strength and the seepage-proofing performance of the part for heightening the new dam body 2 can be effectively improved, and the problems of scattered immersion, seepage and the like of the part for heightening the new dam body 2 are prevented.
Furthermore, the concrete impervious wall 5 extends from the new dam body 2 to the old dam body 1, and is embedded into the old dam body 1 to a depth of 0.3 +/-0.1 m. In specific implementation, the concrete impervious wall 5 extends from the new dam body 2 to the old dam body 1, and the embedding depth of the concrete impervious wall is 0.3 +/-0.1 m, so that the new dam body 2 and the old dam body 1 can be tightly matched, and the strength and the impervious performance of the whole dam body are improved.
Further, the expansive concrete 6 is C25 micro expansive concrete. In specific implementation, the C25 micro-expansion concrete can absorb water to expand after contacting with the permeated water, and the high-efficiency water-blocking and seepage-proofing effects are achieved at the joint of the new dam body 2 and the old dam body 1.
Further, the new dam body 2 is built by using C15 fine-stone concrete masonry stone. During specific implementation, the novel dam body 2 built by the C15 fine-stone concrete masonry barren stones is high in overall structural strength, has a good water-blocking and anti-seepage effect and is suitable for the anti-seepage system.
Example 4:
the embodiment provides a construction method of an anti-seepage system for heightening and expanding a grouted stone gravity dam, which can be applied to the anti-seepage system in any one of the embodiments 1 to 3, and comprises the following steps:
and a, punching holes at the dam foundation of the old dam body 1 according to a set hole interval, and performing curtain grouting to generate a curtain grouting part 3 extending to the lower part of the dam foundation of the old dam body 1. In the step, local reinforcing curtain grouting is carried out on the foundation defect part of the old dam body 1, the distance between single-row holes is 1.5m, the grouting axis is superposed with the original grouting axis of the old dam body 1 and extends into the position 5.0m below a relative impervious layer, and grouting parameters are adjusted according to the actual condition of a pilot hole in construction. And curtain grouting can be carried out on the newly-extended dam foundation of the two dam shoulders, the distance between the single-row holes of the curtain is 1.5m, the bottom of the grouting is deep into the position 5.0m below the relative impervious layer, and the newly-added curtain grouting is connected with the curtain grouting of the old dam 1 foundation.
And b, punching holes at the dam crest of the old dam body 1 along the axis of the old dam body 1 according to the set hole interval, filling and grouting to generate a filling and grouting part 4 extending to the dam foundation of the old dam body 1. In the step, if the old dam body 1 has the phenomenon of dispersion and immersion, filling and grouting can be carried out on the old dam body 1, wherein the filling and grouting is carried out along the axis of the dam body, the single-row hole pitch is 2.5m, and the grouting depth is 3.0m below the contact surface of the dam foundation.
And c, building a new dam body 2 along the back water surface and the dam top of the old dam body 1, laying expansive concrete 6 between the new dam body 2 and the old dam body 1, and building a concrete impervious wall 5 and an expansive water stop strip 7 in the building process of the new dam body 2 at the dam top, so that the concrete impervious wall 5 is arranged at one side close to the water facing surface in the new dam body 2, and the expansive water stop strip 7 is embedded in the gap between the new dam body 2 and the old dam body 1. In the step, a C20W6 concrete impervious wall is arranged in a new raised dam body 2 (which can be built by C15 fine-stone concrete masonry barren stones), the thickness of the impervious wall is about 0.3m, the impervious wall is embedded into an old dam body by about 0.3m, and the distance from the upstream surface of the dam body is about 0.5 m. The C25 expansive concrete with the thickness of 0.3m can be arranged at the joint of the new dam and the old dam, two expansive water stop strips 7 are arranged in the construction joint, the distance between the first expansive water stop strip and the upstream surface is about 0.2m, and the distance between the second expansive water stop strip and the first expansive water stop strip is about 0.2 m.
The embodiment provides a specific application example: a certain reservoir is originally a small (I) type reservoir and is built in 1999, a river blocking dam is an M7.5 grouted barren rock gravity dam, the maximum dam height is 29M, the back slope of an old dam body is obviously dispersed and soaked, and the foundation has local leakage. In 2011, a C15 fine-stone concrete-raised new dam body is built on an old dam body to build a medium-sized reservoir, and the maximum dam height is 34m after the dam body is raised. Considering the diseases of loose immersion, local leakage of the foundation and the like existing in the old dam body, heightening and newly prolonging the crack development of the dam body foundation. Aiming at the practical situation of the engineering, in order to solve the leakage safety problems of the old dam body, the new dam body, the joint of the new dam body and the old dam body and the foundation, the construction method of the embodiment is adopted, so that the problems of the flooding and the leakage of the dam body and the like are effectively solved, the integral seepage-proofing performance of the dam body is improved, and the problems of the flooding and the leakage and the like do not occur when the construction method is implemented until now.
The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.
Claims (10)
1. The utility model provides a grout stone gravity dam increases high prevention of seepage system of enlargement which characterized in that: the novel dam body (2) is arranged on the back surface and the top of the old dam body (1) and comprises a curtain grouting part (3) arranged under the dam foundation of the old dam body (1) in a reinforcing mode and a filling grouting part (4) arranged in the old dam body (1), wherein the filling grouting part (4) is arranged along the axis of the old dam body (1) and extends to the bottom of the dam foundation of the old dam body (1), a concrete impervious wall (5) is arranged in the novel dam body (2) arranged on the top of the old dam body (1), and the novel dam body (2) and the old dam body (1) are connected through expansion concrete (6).
2. The masonry stone gravity dam heightening and expanding seepage-proofing system according to claim 1, characterized in that: an expansion water stop (7) is arranged at the gap between the new dam body (2) and the old dam body (1) at the top of the dam.
3. The masonry stone gravity dam heightening and expanding seepage-proofing system according to claim 2, characterized in that: the expansion water stop bars (7) are arranged in two, wherein one of the expansion water stop bars is 0.2 +/-0.1 m away from the upstream surface of the old dam body (1), and the other expansion water stop bar is 0.4 +/-0.1 m away from the upstream surface of the old dam body (1).
4. The masonry stone gravity dam heightening and expanding seepage-proofing system according to claim 1, characterized in that: the curtain grouting part (3) is formed by curtain grouting with the distance of 1.5m between single-row holes, and the grouting depth is 5m below a foundation relative impervious layer.
5. The masonry stone gravity dam heightening and expanding seepage-proofing system according to claim 1, characterized in that: the filling grouting part (4) is formed by filling grouting along the axis of the old dam body (1) at the interval of 2.5m between the single-row holes, and the grouting depth is 3m below the contact surface of the dam foundation of the old dam body (1).
6. The masonry stone gravity dam heightening and expanding seepage-proofing system according to claim 1, characterized in that: the concrete impervious wall (5) is made of C20W6 waterproof concrete, the thickness of the concrete impervious wall is 0.3 +/-0.1 m, and the distance from the upstream face of the dam body (1) is 0.5 m.
7. The masonry stone gravity dam heightening and expanding seepage-proofing system according to claim 6, characterized in that: the concrete impervious wall (5) extends into the old dam body (1) from the new dam body (2), and the depth of the concrete impervious wall embedded into the old dam body (1) is 0.3 +/-0.1 m.
8. The masonry stone gravity dam heightening and expanding seepage-proofing system according to claim 1, characterized in that: the expansion concrete (6) is C25 micro expansion concrete.
9. The masonry stone gravity dam heightening and expanding seepage-proofing system according to claim 1, characterized in that: the new dam body (2) is built by C15 fine-stone concrete masonry barren stones.
10. A construction method of an anti-seepage system for heightening and expanding a grouted stone gravity dam is applied to the anti-seepage system of any one of claims 1 to 9, and is characterized by comprising the following steps:
punching holes at the dam foundation of the old dam body (1) according to a set hole interval, and performing curtain grouting to generate a curtain grouting part (3) extending to a relative impervious layer of the foundation;
punching holes at the dam crest of the old dam body (1) along the axis of the old dam body (1) according to a set hole interval, and performing filling grouting to generate a filling grouting part (4) extending to the dam foundation of the old dam body (1);
a new dam body (2) is built along the back water surface and the dam top of an old dam body (1), expansion concrete (6) is laid between the new dam body (2) and the old dam body (1), a concrete impervious wall (5) and an expansion water stop strip (7) are built in the building process of the new dam body (2) at the dam top, the concrete impervious wall (5) is arranged at one side, close to the upstream surface, in the new dam body (2), and the expansion water stop strip (7) is embedded in a gap between the new dam body (2) and the old dam body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111644049.7A CN114197403A (en) | 2021-12-29 | 2021-12-29 | Elevation and extension seepage-proofing system for grouted stone gravity dam and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111644049.7A CN114197403A (en) | 2021-12-29 | 2021-12-29 | Elevation and extension seepage-proofing system for grouted stone gravity dam and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114397432A (en) * | 2022-03-24 | 2022-04-26 | 四川省水利水电勘测设计研究院有限公司 | Concrete structure surface crack detection device |
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| CN201857603U (en) * | 2010-09-02 | 2011-06-08 | 广东省水利电力勘测设计研究院 | Heightened gravity dam |
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Application publication date: 20220318 |