CN113832921B - Construction method and structure for core wall dam elevation as face rockfill dam combined with toe board foundation treatment - Google Patents
Construction method and structure for core wall dam elevation as face rockfill dam combined with toe board foundation treatment Download PDFInfo
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- CN113832921B CN113832921B CN202010586209.6A CN202010586209A CN113832921B CN 113832921 B CN113832921 B CN 113832921B CN 202010586209 A CN202010586209 A CN 202010586209A CN 113832921 B CN113832921 B CN 113832921B
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/40—Foundations for dams across valleys or for dam constructions
Abstract
The invention provides a construction method and a construction structure for a core wall dam combined with toenail foundation treatment to be a face rockfill dam, wherein a heightened rockfill dam is arranged on the downstream side of an original dam body of the core wall dam, the central line of the face rockfill dam after construction is arranged on the downstream side of the central line of the original dam body, a concrete impervious wall is arranged on the core wall part of the original dam body for the face rockfill dam, a dam top structure of the original dam body is dismantled, a concrete toenail of the face rockfill dam is poured on the top of the original dam body of the dismantled dam top structure, and the concrete impervious wall is connected with the toenail and the face plate through connecting plates to form a complete impervious system; and, downstream at the concrete cut-off wall, set up the multi-row concrete pile below toe board and connecting plate, the length of concrete pile is towards the downstream direction progressively decrease in proper order. The invention saves the investment for heightening the dam and does not influence the normal operation of the original reservoir on the premise of ensuring the safety of the dam.
Description
Technical Field
The invention relates to a method and a structure for raising a core wall dam into a face rockfill dam by combining toe board foundation treatment, which are suitable for the design and construction of the raising of old dams of hydraulic and hydroelectric engineering.
Background
In the fifties to seventies of the 20 th century, a large number of earth and rockfill dams are built in China to solve irrigation and water supply in rural areas and towns. With the development of the economic society of China, the water consumption of many towns and villages is obviously increased, and some reservoirs built in the last century cannot meet the water supply requirement; in addition, many earth and rockfill dams built earlier have created problems with risks. In order to meet the increasing water supply demands or simultaneously remove risks and reinforce the old dams, some old dams need to be heightened. The clay core wall dam is more among a large number of earth-rock dams constructed in the fifties to seventies of the last century. How to increase the dam on the basis of the old clay core wall dam does not influence the normal operation of the original reservoir, can save the investment of increasing the dam and ensure the safety of the dam, and is a key technology in the design and construction of the old dam increase.
Disclosure of Invention
The invention aims to solve the technical problems that: aiming at the problems, the construction method and the structure for combining the core wall dam elevation of the toenail foundation treatment to be a face rockfill dam are provided, and the aim is to save the investment for heightening the dam and not to influence the normal operation of the original reservoir on the premise of ensuring the safety of the dam.
According to a first aspect of the present invention, there is provided a method of constructing a core dam raised as a face rockfill dam in combination with toe board foundation treatment, characterized by comprising the steps of:
(1) Cleaning the foundation of the thick and high rock-fill dam body on the downstream side of the original dam body of the core wall dam, and filling the thick and high rock-fill dam body to the elevation to be dismantled of the original dam body;
(2) The dam crest structure of the original dam body is excavated, concrete pile groups are arranged at the downstream of the design position of the concrete impervious wall and below the design position of the toe board and the design position of the connecting plate between the toe board and the concrete impervious wall, and the depths of the concrete piles are gradually decreased towards the downstream direction; pouring concrete toe boards of the face rockfill dams;
(3) Continuously filling the thickness-increased dam body above the toe boards;
(4) For the face rockfill dam after the heightened face rockfill dam is rebuilt in the future, firstly, concrete impervious walls are implemented at the core wall parts of the original dam body;
(5) Finally, pouring a concrete panel on the upstream surface of the heightened dam body, and a connecting plate between the toe board and the impervious wall to form a complete impervious system, thereby completing the heightening of the dam;
and water stopping structures are arranged at the joints between the impervious wall and the connecting plate, between the connecting plate and the toe board and between the toe board and the panel.
Further, in the step (2), after the dam top structure of the original dam body is excavated, a small amount of rock-fill is replaced, the plurality of rows of concrete piles are arranged on the radial wall dam in the rock-fill replacement layer, and concrete toe boards are poured on the rock-fill replacement layer.
According to a second aspect of the present invention, there is provided a core dam combined with a toenail foundation treatment, the core dam being raised as a face rockfill dam, characterized in that a raised rockfill dam is provided on a downstream side of an original dam of the core dam, a midline of the face rockfill dam completed by construction is provided downstream of the midline of the original dam, a concrete impermeable wall is provided for the face rockfill dam at a core wall portion of the original dam, a dam top structure of the original dam is removed and a concrete toenail of the face rockfill dam is poured on top of the original dam of the removed dam top structure, the concrete impermeable wall is connected with the toenail via a connection plate, the toenail and the face plate are connected to form a complete impermeable system; and, downstream at the concrete cut-off wall, set up the multi-row concrete pile below toe board and connecting plate, the length of concrete pile is towards the downstream direction progressively decrease in proper order.
Further, pile caps are arranged on pile tops of the multiple rows of concrete piles, and geogrids are paved above the pile caps; the top ends of the concrete piles in multiple rows are positioned on the same horizontal plane.
Further, two water stops are respectively arranged between the concrete impervious wall and the connecting plate, between the connecting plate and the toe board and between the toe board and the panel.
By adopting the technical scheme of the invention, the core wall dam can be raised to be the face rockfill dam, the original core wall dam can be fully utilized as a foundation, the deformation modulus and the bearing capacity of the dam foundation can be improved, uneven settlement is reduced, the influence of different stress conditions on the upstream side and the downstream side of the dam body on the toe plates is improved, the stability of the face rockfill dam on the core wall dam is improved, and the safety of the dam is ensured by arranging the concrete long piles and the concrete short piles at intervals; and save the investment that the dam increases, and the construction does not influence the normal operating of former reservoir.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention after filling a thick rockfill below the top of an original dam.
Fig. 2 is a schematic view of a face rockfill dam of the present invention after toe boards and underlying pile groups are constructed.
Fig. 3 is a raised dam fill above the toe board of the present invention.
Fig. 4 is a schematic view of an embodiment of the present invention for use in diaphragm wall construction.
Fig. 5 is a view of concrete panel and web construction in the practice of the invention.
FIG. 6 is a schematic view of the seam sealing up of the present invention.
Detailed Description
As shown in fig. 1 to 6, the present embodiment is a method and structure for raising a core dam as a face rockfill dam in combination with a toe board foundation treatment, which not only saves the investment for raising the dam, but also does not affect the normal operation of the original reservoir. The main characteristics of this embodiment are: the method comprises the steps of carrying out thickness and height increasing on the downstream side of an original dam body 1, enabling the center line of a panel rock-fill dam which is finally built to be located on the downstream side of the center line of the original dam body 1, arranging a concrete impermeable wall on the center wall 2 of the original dam body 1 for the panel rock-fill dam which is finally built to be completed, removing a dam top structure 4 of the original dam body, pouring a concrete toe board 6 of the panel rock-fill dam on the top of the original dam body with the dam top structure removed, connecting a toe board 6 through a connecting plate 9, connecting the toe board 6 with a panel 8 to form a complete impermeable system, arranging a plurality of rows of concrete piles below the toe board 6 and the connecting plate 9 on the downstream side of the concrete impermeable wall 7, and sequentially reducing the lengths of the concrete piles towards the downstream direction.
The construction method comprises the following steps:
a. cleaning the foundation of the thick and high rock-fill dam body on the downstream side of the original dam body 1, and filling the thick and high rock-fill dam body 3 to the height to be dismantled of the original dam body, as shown in figure 1;
b. as shown in fig. 2, the dam crest structure 4 of the original dam body is excavated, a small amount of displacement rock-fill 5 is carried out, and the purpose of displacement rock-fill 5 is to reduce sedimentation deformation of the water storage rear toe board 6 and the connecting plate 9, avoid deformation damage of the water stop 10 and simultaneously meet the anti-seepage and anti-filtration requirements of the dam body.
Two rows of concrete long piles 51 and concrete short piles 52 are arranged inside the diaphragm wall 2 in the replacement layer formed by the rockfill 5, the concrete long piles 51 are arranged on the upstream side of the concrete short piles 52, each row of concrete long piles 51 comprises at least two concrete long piles which are distributed at intervals along the axial direction of the dam, and each row of concrete short piles 52 comprises at least two concrete short piles which are distributed at intervals along the axial direction of the dam.
Pile caps 53 are arranged on pile tops of the concrete long piles 51 and the concrete short piles 52, and geogrids 54 are paved above the pile caps 53. The top ends of the concrete long piles 51 and the concrete short piles 52 are positioned on the same horizontal plane.
Then, a concrete toe board 6 is poured on the displacement stone 5.
c. Continuously filling the thickness of the raised dam body 3 above the toe board to the design height, as shown in figure 3;
d. for the face rockfill dam after the heightened face rockfill dam is rebuilt in the future, firstly, a concrete impervious wall 7 is implemented at the core wall 2 part of the original dam body 1, as shown in fig. 4;
e. finally, pouring a concrete panel 8 on the upstream surface of the heightened dam body, a toe board 6 and a connecting plate 9 between the impermeable walls to form a complete impermeable system, and completing the heightening of the dam, as shown in fig. 5; reference numeral A is a dam body central line of the heightened face rockfill dam;
f. two water stops 10 are arranged at the joints among the impervious wall 7, the connecting plate 9, the toe board 6 and the panel 8.
Unless specifically stated otherwise, in the present invention, if there are terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the positional relationship indicated is based on the positional relationship indicated in the drawings, and is merely for convenience of describing the present invention and simplifying the description, and it is not necessary to indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, so that the terms describing the positional relationship in the present invention are merely for exemplary illustration and should not be construed as limitations of the present patent, and it is possible for those skilled in the art to understand the specific meaning of the above terms in conjunction with the drawings and according to the specific circumstances.
Unless specifically stated or limited otherwise, the terms "disposed," "connected," and "connected" herein are to be construed broadly, e.g., they may be fixed, removable, or integral; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The above embodiment is only one preferred technical solution of the present invention, and it should be understood by those skilled in the art that modifications and substitutions can be made to the technical solution or parameters in the embodiment without departing from the principle and essence of the present invention, and all the modifications and substitutions are covered in the protection scope of the present invention.
Claims (1)
1. A construction method for raising a core wall dam combined with a toe board foundation treatment into a face rockfill dam is characterized in that the structure of the core wall dam combined with the toe board foundation treatment into the face rockfill dam comprises the following steps: setting a heightened rock-fill dam body on the downstream side of an original dam body of a core wall dam, setting a seepage-proofing wall for the concrete face rock-fill dam at the core wall part of the original dam body, dismantling a dam top structure of the original dam body, pouring a toe board of the concrete face rock-fill dam at the top of the original dam body of the dismantled dam top structure, and connecting the seepage-proofing wall with the toe board and forming a complete seepage-proofing system; a plurality of rows of concrete piles are arranged below the toe boards and the connecting plates at the downstream of the impervious wall, and the lengths of the concrete piles decrease in sequence towards the downstream direction;
the construction method comprises the following steps:
(1) Cleaning the foundation of the thick and high rock-fill dam body on the downstream side of the original dam body of the core wall dam, and filling the thick and high rock-fill dam body (3) to the elevation to be dismantled of the original dam body;
(2) A dam crest structure (4) of the original dam body is excavated, a concrete pile group is arranged at the downstream of the design position of the impervious wall and below the design position of the toe board and the design position of the connecting plate between the toe board and the impervious wall (7), and the depth of the concrete pile is gradually decreased towards the downstream direction; pouring toe boards (6) of the face rockfill dams;
(3) Continuously filling a thickness-increased dam body (3) above the toe boards;
(4) For the face rockfill dam after the heightened face rockfill dam is reconstructed in the future, firstly, implementing a diaphragm wall (7) at the core wall part of the original dam body;
(5) Finally, a panel (8) of the upstream face of the heightened dam body and a connecting plate (9) between the toe board and the impervious wall are poured to form a complete impervious system, and the heightening of the dam is completed;
a water stopping structure is arranged at the joints between the impervious wall (7) and the connecting plate (9), between the connecting plate (9) and the toe board (6) and between the toe board (6) and the panel (8);
in the step (2), after a dam top structure (4) of an original dam body is excavated, a small amount of rock-fill is replaced, a plurality of rows of concrete piles are arranged on a radial wall dam in a rock-fill replacement layer, and a toe board is poured on the rock-fill replacement layer; pile caps are arranged on pile tops of the multiple rows of concrete piles, and geogrids are paved above the pile caps; the top ends of the concrete piles in multiple rows are positioned on the same horizontal plane.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010586209.6A CN113832921B (en) | 2020-06-24 | 2020-06-24 | Construction method and structure for core wall dam elevation as face rockfill dam combined with toe board foundation treatment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010586209.6A CN113832921B (en) | 2020-06-24 | 2020-06-24 | Construction method and structure for core wall dam elevation as face rockfill dam combined with toe board foundation treatment |
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| CN113832921A CN113832921A (en) | 2021-12-24 |
| CN113832921B true CN113832921B (en) | 2023-06-02 |
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| CN114960555A (en) * | 2022-07-19 | 2022-08-30 | 河南绿岩工程科技有限公司 | Widened seepage-proofing structure for penetrated earth-rock dam and construction method |
| CN117328411B (en) * | 2023-09-13 | 2024-03-26 | 大连理工大学 | Design and construction method of toe board supporting wall for improving deformation of water-stop joint of seepage-proofing body of cover layer upper face plate dam |
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| JP2007046348A (en) * | 2005-08-10 | 2007-02-22 | Shimizu Corp | Repairing and reinforcing structure for concrete dam |
| CN203716168U (en) * | 2014-01-16 | 2014-07-16 | 黄河勘测规划设计有限公司 | Toe slab foundation structure of deep covering layer of concrete face rockfill dam |
| CN105297680B (en) * | 2015-11-29 | 2017-10-13 | 中国水利水电科学研究院 | A kind of 200m grades of high CFRD impervious body Seismic Design Method |
| CN106759133A (en) * | 2017-01-13 | 2017-05-31 | 中国电建集团华东勘测设计研究院有限公司 | The mixing structure of dam type and construction method of a kind of homogeneous earth and rockfill dam and rock |
| CN206971247U (en) * | 2017-06-19 | 2018-02-06 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of concrete plinth foundation ruggedized construction being placed on Unloading Rock |
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