CN110144856B - Method for preventing deformation cracks generated by face plate of rock-fill dam of narrow V-shaped valley high face plate from being hollowed - Google Patents
Method for preventing deformation cracks generated by face plate of rock-fill dam of narrow V-shaped valley high face plate from being hollowed Download PDFInfo
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- CN110144856B CN110144856B CN201910438678.0A CN201910438678A CN110144856B CN 110144856 B CN110144856 B CN 110144856B CN 201910438678 A CN201910438678 A CN 201910438678A CN 110144856 B CN110144856 B CN 110144856B
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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
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
- E02B7/06—Earth-fill dams; Rock-fill dams
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- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a method for preventing deformation cracks generated by the hollowing of a high face plate rock-fill dam panel of a narrow V-shaped valley, filling dam body filling materials in the V-shaped valley, filling a large stone arch on the upper part of the dam body filling materials after the dam body filling materials are filled to a certain height, filling the dam body filling materials on the upper part of the large stone arch, repeating the steps until the filling materials reach the top of the dam, and finishing the whole filling process. The method utilizes the arch effect of the rockfill to form a natural rolling arch part to bear the settlement deformation of each layer on the upper part, so that the settlement deformation is in a controllable range, the whole deformation protection panel of the dam body is prevented from being empty to generate structural cracks, the range of the settlement deformation can be effectively controlled, the operation safety of the dam is ensured, and the cost of later-stage operation management and maintenance can be reduced.
Description
Technical Field
The invention relates to a high-face rockfill dam, in particular to a method for preventing deformation cracks generated by the panel of the high-face rockfill dam in a narrow V-shaped valley through being hollowed, which is mainly used for reducing the sedimentation deformation of a dam body and protecting the panel from being hollowed to generate structural cracks.
Background
Structural cracks often occur on the face plate of the high face rockfill dam, most of the structural cracks are caused by the settlement deformation of the main rockfill body and the secondary rockfill body of the dam, and the face plate is difficult to deform in accordance with the self of the dam due to the influence of the rigidity of the face plate, so that the face plate and the dam are separated, and cracks are generated, which is a problem that any face rockfill dam necessarily has. In the actual engineering:
the 233m high water bufferblock produced 914 fissures. 1530 cracks are generated on the primary dam of the natural bridge with the height of 178 m. The dam safety is endangered by water leakage caused by panel cracks; a large amount of water leakage influences the use function of the dam; the treatment is troublesome and the investment is large; and is inconvenient for later operation management. Therefore, it is a problem how to reduce the dam settlement and thus avoid the occurrence of a large number of cracks in the face plate.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for preventing the face plate of the rock-fill dam of the high face plate of the narrow V-shaped valley from being hollowed to generate deformation cracks, wherein the settlement deformation is in a controllable range, so that the whole deformation protection face plate of the dam body is reduced, and the face plate is not hollowed to generate structural cracks.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for preventing the deformation and crack of the face plate of the rock-fill dam with high face plate in narrow V-shaped valley is characterized by filling dam filling material in the V-shaped valley, filling a large stone arch on the upper part of the dam filling material after the dam filling material is filled to a certain height, filling the dam filling material on the upper part of the large stone arch, repeating the steps until the filling material is filled to the top of the dam, and finishing the whole filling process.
The width-to-height ratio of the V-shaped river valley is 2.5-4.0.
The thickness of the dam filling material is 4.5-6.0 m, and the dam filling material is filled into the shape of an inverted pot.
The particle size of the stones of the large stone arch is more than or equal to 50cm, and the compressive strength is more than or equal to 35 MPa.
The arch thickness of the large stone arch is 2.5-3.0 m.
The invention has the beneficial effects that: by utilizing the arch effect of the rockfill, a natural rolling arch part is formed to bear the settlement deformation of each layer on the upper part, so that the settlement deformation is in a controllable range, and the whole deformation protection panel of the dam body is reduced to prevent the dam body from being empty and generating structural cracks.
Drawings
FIG. 1 is a longitudinal cross-sectional view of a layered arch fill of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
as shown in figure 1, the method for preventing deformation cracks generated by the hollowing of the high face rockfill dam panel of the narrow V-shaped valley fills a dam filling material 3 in the V-shaped valley 1, fills a large stone arch 2 on the dam filling material 3 after the dam filling material 3 is filled to a certain height, fills the dam filling material 3 on the large stone arch 2, and repeats the steps until the filling is finished until the filling material 4 on the top of the dam is filled, and the whole filling process is finished.
The width-to-height ratio of the V-shaped river valley 1 is 2.5-4.0.
The thickness of the dam filling material 3 is 4.5-6.0 m, and the dam filling material is filled into the shape of an inverted pot.
The particle size of the stones of the large stone arch 2 is more than or equal to 50cm, and the compressive strength is more than or equal to 35 MPa.
The arch thickness of the large stone arch 2 is 2.5-3.0 m.
The invention utilizes the arch effect of the rockfill to form a natural rolling arch part to bear the settlement deformation of each layer at the upper part, so that the settlement deformation is in a controllable range, thereby reducing the possibility that the whole deformation protection panel of the dam body is not hollowed to generate structural cracks.
Specifically, the method comprises the following steps:
1. filling materials 3 of a dam body are filled in the V-shaped river valley 1, and the top surface of the dam body is rolled into an arch shape.
2. And after 4.5-6.0 m of dam filling material 3 is filled, filling a large stone arch 2 with the thickness of 2.5-3.0 m on the upper part of the dam filling material 3.
3. The upper part of the large stone arch 2 is connected with filling dam body filling materials 3.
4. And repeating the steps until the dam top filler 4 is filled.
The above-mentioned embodiments 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 carry out the same, and the present invention shall not be limited to the embodiments, i.e. the equivalent changes or modifications made within the spirit of the present invention shall fall within the scope of the present invention.
Claims (5)
1. A method for preventing deformation cracks generated by the hollowing of high face rockfill dam panels of narrow V-shaped valley is characterized in that dam filling materials (3) are filled in the V-shaped valley (1), after the dam filling materials (3) are filled to a certain height, a large stone arch (2) is filled on the upper portion of the dam filling materials (3), the dam filling materials (3) are filled on the upper portion of the large stone arch (2), the steps are repeated until filling materials (4) on the top of the dam are filled, and the whole filling process is completed.
2. The method for preventing deformation and crack of the rockfill dam panel of the narrow V-shaped valley according to claim 1, wherein the width-to-height ratio of the V-shaped valley (1) is 2.5-4.0.
3. The method for preventing deformation and cracks generated by the void of the rock-fill dam panel of the narrow V-shaped valley high face plate according to claim 1, wherein the dam body filling material (3) has a thickness of 4.5-6.0 m and is filled into the shape of an inverted pot.
4. The method for preventing deformation and cracks generated by the face plate of the rock-fill dam of the narrow V-shaped valley high face plate in the process of being hollowed is characterized in that the particle size of the stone of the large stone arch (2) is more than or equal to 50cm, and the compressive strength is more than or equal to 35 MPa.
5. The method for preventing deformation and crack of the narrow V-shaped valley high face rockfill dam panel due to the fact that the arch thickness of the large stone arch (2) is 2.5-3.0 m is characterized in that the large stone arch is formed by the fact that the large.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910438678.0A CN110144856B (en) | 2019-05-24 | 2019-05-24 | Method for preventing deformation cracks generated by face plate of rock-fill dam of narrow V-shaped valley high face plate from being hollowed |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910438678.0A CN110144856B (en) | 2019-05-24 | 2019-05-24 | Method for preventing deformation cracks generated by face plate of rock-fill dam of narrow V-shaped valley high face plate from being hollowed |
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| Publication Number | Publication Date |
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| CN110144856A CN110144856A (en) | 2019-08-20 |
| CN110144856B true CN110144856B (en) | 2020-10-27 |
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| CN201910438678.0A Active CN110144856B (en) | 2019-05-24 | 2019-05-24 | Method for preventing deformation cracks generated by face plate of rock-fill dam of narrow V-shaped valley high face plate from being hollowed |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111945675B (en) * | 2020-07-30 | 2022-05-17 | 四川大学 | Interval alternate die-increasing longitudinal partition arc-shaped cabin face filling earth-rock dam |
| CN114293517B (en) * | 2022-02-24 | 2023-09-29 | 中水北方勘测设计研究有限责任公司 | Method for preventing asphalt concrete core wall and concrete base in mountain gorge valley region from cracking |
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| KR101367657B1 (en) * | 2011-11-25 | 2014-02-28 | 주식회사 정원종합산업 | Method for constructing face slab of concrete face rockfill dam |
| CN204356738U (en) * | 2014-12-11 | 2015-05-27 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of concrete face rockfill dam upstream face structure of preventing face slab dislocation |
| CN106812119B (en) * | 2017-03-10 | 2018-09-07 | 水利部交通运输部国家能源局南京水利科学研究院 | The gasbag-type automatic safety device and its design method that face-plate of rockfill dam comes to nothing |
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