Underwater treatment method for fracture of rockfill dam face plate

Abstract

The present invention discloses an underwater treatment method for rockfill dam panel fracture, and belongs to the technical field of concrete rockfill dam panels. The method comprises the following steps: a temporary plugging step, using underwater rapid plugging materials to temporarily plug the cracks of the rockfill dam panel; a flexible grouting step, pouring flexible grouting materials into the rockfill dam panel cracks near the structural seams on both sides by gravity pouring; a rigid grouting step, pouring rigid grouting materials into the hollowed-out parts of the rockfill dam panel and the cushion layer by gravity pouring; a temporary plugging removal step, removing the underwater rapid plugging materials and cleaning the temporary plugging parts; a crack surface filling step, filling the cracks according to their sizes, and the cracks are divided into Class I cracks and Class II cracks, wherein Class I cracks are filled with flexible embedding materials, and Class II cracks are poured with flexible grouting materials. The present invention solves the technical problems in the prior art that the rockfill dam panel cracks have poor anti-leakage effect and cannot adapt to the continued deformation of the rockfill body and the cushion layer.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete rockfill dam panels, and in particular relates to an underwater processing method for fractured rockfill dam panels. Background Art

[0002] The rockfill dam panel is a dam type that uses the rockfill body as a supporting structure and sets a panel on the upstream surface of the rockfill body as an anti-seepage structure. The rockfill dam panel is mostly made of cast-in-place concrete structure. Due to the large height of the rockfill dam panel, the rockfill body will inevitably have uneven settlement, while the thickness of the concrete panel is relatively small and it relies on the rockfill body as support. Therefore, once the rockfill body has uneven settlement, the concrete panel may break under the action of the water pressure in front of the dam.

[0003] At present, in the prior art, on the one hand, the treatment method for cracks in the rockfill dam panel is usually dry land construction. For the panel rockfill dam that has been delivered for use, if the problem of cracks in the rockfill dam panel is treated dry land, the reservoir needs to be emptied, which not only seriously affects the normal operation of the reservoir or power station, but also causes serious waste of water resources; on the other hand, even if there are some methods for underwater treatment of cracks in the rockfill dam panel in the prior art, one of the current treatment methods is a rapid repair method, which only treats the surface of the cracks, such as the patent CN111535253A panel rockfill dam seepage crack underwater rapid repair construction method and its repair structure, and the other method, although grouting is performed on the cracks, only flexible The grouting material is poured and the pouring position is to bury the grouting pipe in the cracks and around the cracks, and then cover the surface cracks with an anti-seepage cover sheet, such as the underwater repair method for water seepage cracks in concrete panels of patent CN110984160A. The cracks after this treatment cannot timely block the leakage channels extending from the cracks to the surrounding areas and the leakage channels around the adjacent structural joints, so the anti-leakage effect of the cracks after treatment is poor; secondly, the rigid grouting material is not poured into the hollow parts between the rockfill dam panel and the cushion layer, which may not be able to adapt to the continued deformation of the rockfill body and the cushion layer, so the cracks after treatment may still break, resulting in problems such as poor durability. Summary of the invention

[0004] The details of one or more embodiments of the present invention are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent.

[0005] The present invention proposes an underwater treatment method for fractured rockfill dam panels, which solves the technical problems in the prior art that cracks in rockfill dam panels have poor anti-leakage effect after fracture, cannot adapt to continued deformation of the rockfill body and cushion layer, and have poor durability. The method can greatly improve the anti-seepage effect and durability of the fractured parts of the rockfill dam panels after treatment.

[0006] The invention discloses an underwater treatment method for rockfill dam panel fracture, comprising the following steps: a temporary plugging step: using underwater rapid plugging materials to temporarily plug the cracks of the rockfill dam panel to prevent leakage;

[0007] Flexible grouting steps: For the parts of the rockfill dam panel cracks close to the structural joints on both sides, the flexible grouting material is poured by gravity pouring until the flexible grouting material fills the rockfill dam panel cracks and the surrounding leakage channels and the adjacent structural joints;

[0008] Rigid grouting steps: Gravity pour rigid grouting materials into the empty areas between the rockfill dam face plate and cushion until the empty areas are filled;

[0009] Steps for removing temporary plugging: remove underwater rapid plugging materials and clean up the temporary plugging part;

[0010] Crack surface filling steps: Fill according to the size of the cracks. The cracks are divided into Class I cracks and Class II cracks. Class I cracks are filled with flexible filling materials, and Class II cracks are filled with flexible grouting materials.

[0011] In some of the embodiments, the flexible grouting step further includes opening a flexible grouting hole at a location close to the structural seams on both sides of the crack in the rockfill dam panel, wherein the flexible grouting hole is an inclined hole, and flexible grouting material is poured into the flexible grouting hole by gravity to fill the crack in the rockfill dam panel and the leakage channel around it together with the adjacent structural seams.

[0012] In some of the embodiments, the rigid grouting step further includes opening a plurality of rigid grouting holes along the length direction of the cracks in the rockfill dam panel, wherein the rigid grouting holes are inclined holes, and rigid grouting materials are poured into the plurality of rigid grouting holes by gravity pouring into the hollow parts between the rockfill dam panel and the cushion layer until the hollow parts between the rockfill dam panel and the cushion layer are filled.

[0013] In some of the embodiments, in the crack surface filling step, the specific method for filling a type of crack with a flexible filling material is: opening a U-shaped groove at the type of crack, filling the bottom of the U-shaped groove with underwater rapid sealing material, applying underwater adhesive on both sides of the U-shaped groove, and filling the U-shaped groove with flexible filling material.

[0014] In some embodiments, the upper width of the U-shaped groove is 8 cm, the groove depth is 6 cm, and the groove bottom width is 4 cm.

[0015] In some of the embodiments, the underwater treatment method for rockfill dam panel fracture also includes the step of pasting a flexible anti-seepage cover sheet: first, the water-facing surface of the rockfill dam panel crack is coated with an underwater adhesive, and then the flexible anti-seepage cover sheet is pasted to cover the entire area of ​​the rockfill dam panel crack.

[0016] In some embodiments, the step of pasting the flexible anti-seepage cover sheet also includes: before pasting the flexible anti-seepage cover sheet, leveling the water-facing surface of the cracks in the rockfill dam panel to ensure a tight fit between the flexible anti-seepage cover sheet and the rockfill dam panel.

[0017] In some of the embodiments, the underwater adhesive is prepared by mixing epoxy resin and curing agent in a weight ratio of 3:1 to 5:1, and is directly applied underwater after being fully stirred.

[0018] In some of the embodiments, the underwater processing method for rockfill dam panel fracture also includes an underwater inspection step: divers dive underwater to inspect the rockfill dam panel and record the location, width, depth and leakage of cracks in the rockfill dam panel, wherein the entire inspection process is recorded and tracked and guided by water technicians.

[0019] In some of the embodiments, the underwater treatment method for rockfill dam face plate fracture further includes an acceptance step: checking the seepage of the rockfill dam, and if the seepage of the rockfill dam drops to a predetermined standard, the acceptance is qualified, otherwise it is unqualified.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention adopts the treatment method: temporary plugging → flexible grouting → rigid grouting → removal of temporary plugging → temporary plugging crack filling → pasting of flexible anti-seepage cover sheet, and the cracks are repaired through this series of combined treatment methods. Each step is linked together. Through the selection and use of different types of grouting materials, the thoroughness and long-term effectiveness of the crack repair are ensured; the combination of temporary plugging and flexible grouting can not only quickly prevent leakage, but also adapt to structural deformation, and rigid grouting provides structural support to ensure the overall stability and durability of the rockfill dam. The present invention repairs cracks through this interlocking combined treatment method, so that the seepage at the repaired crack is reduced from more than 30L / s to less than 3L / s, the ductility of the flexible grouting material can reach more than 30%, and the rigid grouting material can fill the empty part between the rockfill dam panel and the cushion layer, so as to better adapt to the uneven settlement of the rockfill body, ensure the reliability and durability after repair, and make the durability of the rockfill dam panel reach more than 10 years. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 A schematic diagram of the longitudinal structure of underwater treatment of cracks in a rockfill dam face plate provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the transverse structure of the underwater treatment of cracks in a rockfill dam face plate provided by an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the structure of a U-shaped groove provided in an embodiment of the present invention;

[0026] In the above figures, 1-rockfill dam panel; 2-cushion; 3-underwater rapid plugging material; 4-flexible grouting material; 5-rigid grouting material; 6-flexible grouting hole; 7-rigid grouting hole; 8-flexible embedding material; 9-flexible anti-seepage cover; 10-underwater adhesive; 11-structural joint; 12-pressure strip; 13-anchor bolt. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0028] Obviously, the drawings described below are only some examples or embodiments of the present invention. For ordinary technicians in this field, the present invention can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed by the present invention, some changes in design, manufacturing or production based on the technical content disclosed by the present invention are just conventional technical means, and should not be understood as insufficient content disclosed by the present invention.

[0029] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in the present invention may be combined with other embodiments without conflict.

[0030] Unless otherwise defined, the technical terms or scientific terms involved in the present invention shall have the usual meanings understood by persons with ordinary skills in the technical field to which the present invention belongs. The words "one", "a", "a", "the" and the like involved in the present invention do not indicate a quantity limitation and may indicate the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in the present invention are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device including a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in the present invention are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in the present invention refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, "A and / or B" may indicate: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects in the front and back relation are in an "or" relationship. The terms "first", "second", "third" and the like involved in the present invention are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0031] The embodiment of the present invention provides an underwater repair device for a diversion tunnel gate slot, referring to Figure 1-Figure 3 As shown, the underwater treatment method for rockfill dam face plate fracture comprises the following steps:

[0032] Temporary plugging step: using underwater rapid plugging materials 3 to temporarily plug the cracks in the rockfill dam face plate 1 to prevent leakage;

[0033] Flexible grouting step: for the part of the crack of the rockfill dam panel 1 close to the structural joints 11 on both sides, the flexible grouting material 4 is poured by gravity pouring until the flexible grouting material 4 fills the crack of the rockfill dam panel 1 and the leakage channel around it and the inside of the adjacent structural joints 11;

[0034] Rigid grouting step: self-flowingly pouring rigid grouting material 5 into the hollowed-out part between the face plate 1 and the cushion layer 2 of the rockfill dam until the hollowed-out part is filled;

[0035] Temporary plugging removal steps: remove the underwater rapid plugging material 3 and clean the temporary plugging part;

[0036] Crack surface filling steps: Fill the cracks according to their size. The cracks are divided into Class I cracks and Class II cracks. Class I cracks are filled with flexible filling materials 8, and Class II cracks are grouted with flexible grouting materials 4.

[0037] The underwater treatment method of the cracks in the rockfill dam panel 1 of the present invention gradually solves the leakage problem of the cracks in the rockfill dam panel 1 through the steps of temporary plugging, flexible grouting and rigid grouting. The temporary plugging step uses underwater rapid plugging materials 3 to prevent leakage and prevent further damage. The flexible grouting step fills the flexible grouting material 4 near the structural seams 11 on both sides of the crack by gravity pouring, ensuring that the flexible grouting material 4 completely fills the crack and the leakage channel around it together with the adjacent structural seams, thereby blocking the leakage channel extending from the crack to the surrounding area. The rigid grouting step is to fill the empty part of the rockfill dam panel 1 and the cushion layer 2 to restore its overall stability. The removal of the temporary plugging step ensures the removal of the underwater rapid plugging material 3 so that the filling material can fully play its role. Finally, the appropriate filling material is selected according to the size of the crack to finally treat the crack. The method uses underwater operation to treat the cracks in the rockfill dam panel 1, can directly find the leakage point during the operation, and perform water stopping treatment on the leakage point, so that the panel can restore the water retaining function as soon as possible, thereby greatly reducing the seepage of the dam body.

[0038] Tests have shown that the underwater treatment method of the present invention can reduce the seepage caused by cracks in the rockfill dam face plate 1 from more than 30L / s to less than 3L / s. The flexible treatment method adapts to the continued deformation of the rockfill body and the cushion layer 2 and has good durability. Relevant engineering cases show that its durability can reach more than 10 years.

[0039] The specific data of seepage volume and durability after testing are shown in Table 1.

[0040] Table 1 Seepage and durability test data

[0041]

[0042] It can be seen from the data in Table 1 that after adopting the underwater treatment method of the present invention, the seepage at the cracks is greatly reduced, and the degree of reduction has also been greatly improved, which greatly enhances the sealing of the overall rockfill dam panel and thus improves durability.

[0043] Furthermore, the flexible grouting step also includes opening a flexible grouting hole 6 at the position of the crack of the rockfill dam panel 1 close to the structural seams 11 on both sides, wherein the flexible grouting hole 6 is an inclined hole, and the flexible grouting material 4 is poured into the flexible grouting hole 6 by gravity pouring to fill the crack of the rockfill dam panel 1 and the leakage channel around it together with the adjacent structural seams 11. In the flexible grouting step, by opening the flexible grouting hole 6 at the position of the crack of the rockfill dam panel 1 close to the structural seams 11 on both sides, the flexible grouting material 4 can better penetrate and fill the crack and the leakage channel around it. The flexible grouting hole 6 is designed as an inclined hole, which can improve the filling efficiency of the flexible grouting material 4, and ensure that the flexible grouting material 4 can fully fill the crack and the structural seams 11 around it, and enhance the overall sealing effect. By setting the flexible grouting hole 6, the filling effect of the grouting material can be improved, and the crack and the leakage channel around it can be fully filled, and the sealing effect and structural stability of the rockfill dam panel 1 can be further enhanced. The inclined hole design enables the grouting material to be distributed more evenly, improving the efficiency and effectiveness of the grouting process, thereby further reducing the seepage of the dam body and extending the service life of the rockfill dam.

[0044] The flexible grouting material 4 refers to a grouting material having good flexibility and ductility after solidification. The flexible grouting material 4 is poured by self-flowing pouring, preferably by low-pressure self-flowing pouring. During the pouring process, the change of the grouting pressure and the condition of the rockfill dam panel at the grouting location are taken into consideration in real time to prevent the flexible grouting material 4 from lifting the surface watertightness of the rockfill dam panel or the structural joint 11.

[0045] In order to verify the ductility and bonding strength of the flexible grouting material 4, a simulation experiment was carried out in the laboratory, as follows:

[0046] Example

[0047] Place two concrete blocks underwater and fix them firmly. Use the gap between the concrete blocks as a crack and inject flexible grouting material 4 into the gap by gravity to fill the gap. After the flexible grouting material 4 is completely cured, check the bonding strength between the flexible grouting material 4 and the concrete blocks and the ductility of the flexible grouting material 4.

[0048] Comparative Example

[0049] Place two concrete blocks underwater and fix them firmly. Use the gap between the concrete blocks as a crack and inject the existing flexible grouting material into the gap by gravity to fill the gap. After the existing flexible grouting material is completely cured, check the bonding strength between the existing flexible grouting material and the concrete blocks and the ductility of the existing flexible grouting material.

[0050] Table 2 Adhesion strength and ductility test data

[0051]

[0052] It can be seen from the data in Table 2 that the bonding strength of the flexible grouting material 4 used in the present invention can reach more than 1.3 MPa, and the bonding property with concrete is better, which can further improve the strength and stability of the entire rockfill dam; and the flexible grouting material 4 has good ductility, which can better extend to the leakage channel around the cracks, and prevent the surrounding small cracks from further expanding.

[0053] Furthermore, the rigid grouting step also includes opening a plurality of rigid grouting holes 7 along the length direction of the cracks in the rockfill dam panel 1, wherein the rigid grouting holes 7 are inclined holes, and the rigid grouting material 5 is poured into the plurality of rigid grouting holes 7 by gravity pouring into the hollowed-out parts of the rockfill dam panel 1 and the cushion layer 2 until the hollowed-out parts of the rockfill dam panel 1 and the cushion layer 2 are filled. In the rigid grouting step, by opening a plurality of rigid grouting holes 7 along the length direction of the cracks in the rockfill dam panel 1, the rigid grouting material 5 can better penetrate and fill the hollowed-out parts of the rockfill dam panel 1 and the cushion layer 2. The rigid grouting holes 7 are designed as inclined holes, which can improve the filling efficiency of the rigid grouting material 5, and ensure that the rigid grouting material 5 can fully fill the hollowed-out parts, thereby restoring the overall stability of the rockfill dam panel 1 and the cushion layer 2. By providing a plurality of rigid grouting holes 7, the filling effect of the rigid grouting material 5 can be improved, ensuring that the vacant parts of the rockfill dam face plate 1 and the cushion layer 2 are fully filled, thereby enhancing the overall structural stability; the inclined hole design enables the rigid grouting material 5 to be more evenly distributed, thereby improving the efficiency and effect of the grouting process, thereby further reducing the seepage volume of the cracks in the rockfill dam face plate and extending the service life of the rockfill dam face plate.

[0054] The rigid grouting material 5 refers to a material that does not have flexibility after the grout is cured but can be well combined with concrete; the rigid grouting material 5 can preferably be underwater non-dispersible cement mortar. The rigid grouting material 5 is poured by gravity pouring, preferably low-pressure gravity pouring. During the pouring process, the change of the grouting pressure and the condition of the rockfill dam panel at the grouting location are poured in real time to prevent the rigid grouting material 5 from lifting the surface water stop of the rockfill dam panel or the structural joint 11.

[0055] Furthermore, in the crack surface filling step, a specific method for filling a type of crack with a flexible filling material 8 is as follows: a U-shaped groove is opened at a type of crack, an underwater rapid plugging material 3 is embedded at the bottom of the U-shaped groove, an underwater adhesive 10 is applied on both sides of the U-shaped groove, and a flexible filling material 8 is embedded in the U-shaped groove. For a type of crack, a U-shaped groove is first opened at a type of crack, and the adhesion and sealing effect of the filling material are improved by the structural characteristics of the U-shaped groove. The underwater rapid plugging material 3 is embedded at the bottom of the U-shaped groove to form a solid foundation. Underwater adhesive 10 is applied on both sides of the U-shaped groove to ensure the firm bonding of the flexible filling material 8. Finally, the flexible filling material 8 is embedded in the U-shaped groove to fully and effectively seal the crack. By opening a U-shaped groove and embedding the flexible filling material 8, the effect of crack filling can be improved, ensuring that the cracks are fully sealed, and enhancing the structural stability and durability of the rockfill dam panel 1. The design of the U-shaped groove makes the bonding between the filling material and both sides of the crack more firm, thereby further reducing the seepage of the rockfill dam face plate 1 and extending the service life of the rockfill dam face plate 1.

[0056] Among them, when the crack width δ>2 mm, it is a type I crack; when the crack width δ≤2 mm, it is a type II crack;

[0057] Furthermore, the upper width of the U-shaped groove is 8 cm, the groove depth is 6 cm, and the groove bottom width is 4 cm. By setting the specific size of the U-shaped groove, the filling effect and bonding force of the flexible embedding material 8 in the crack can be ensured, and the sealing effect of the crack and the structural stability of the rockfill dam panel 1 can be further improved. Reasonable size design is conducive to the uniform distribution and bonding of the material, reducing the risk of leakage and extending the service life of the rockfill dam panel 1.

[0058] Furthermore, the underwater treatment method for the fracture of the rockfill dam panel also includes the step of pasting a flexible anti-seepage cover sheet: first, the water-facing surface of the crack of the rockfill dam panel 1 is coated with an underwater adhesive 10, and then the flexible anti-seepage cover sheet 9 is pasted to cover the entire area of ​​the crack of the rockfill dam panel 1. After the temporary plugging, flexible grouting, rigid grouting, removal of temporary plugging and crack surface filling steps are completed, the sealing effect of the crack is further enhanced by applying the underwater adhesive 10 on the water-facing surface of the crack of the rockfill dam panel 1, and then pasting the flexible anti-seepage cover sheet 9. The flexible anti-seepage cover sheet 9 covers the entire area of ​​the crack of the rockfill dam panel 1 to ensure the anti-seepage effect. By pasting the flexible anti-seepage cover sheet 9, the sealing effect of the crack can be improved, and the structural stability and durability of the rockfill dam panel 1 can be further enhanced. The application of the flexible anti-seepage cover sheet 9 allows the cracks to be fully covered and sealed, further reducing the risk of leakage and extending the service life of the rockfill dam.

[0059] The flexible anti-seepage cover sheet 9 may be a GB composite EPDM cover sheet or a SR anti-seepage protection cover sheet; when the SR anti-seepage protection cover sheet is used, the EPDM rubber reinforced type is preferred.

[0060] In some embodiments, after the flexible anti-seepage cover sheet 9 is pasted, in order to further ensure the firmness of the bonding between the flexible anti-seepage cover sheet 9 and the rockfill dam panel 1, not only is the bonding performed by applying the underwater adhesive 10, but also a pressure strip 12 is added to the flexible anti-seepage cover sheet 9, and then further reinforced by anchor bolts 13, such as Figure 1 As shown, the sealing performance of the rockfill dam face plate 1 is further enhanced by this reinforcement method.

[0061] In some embodiments, the underwater adhesive 10 preferably uses QDC-501 underwater epoxy material, wherein QDC-501 underwater epoxy material can be cured in water, moisture, dryness, low temperature (above 5°C), room temperature and all-weather conditions, and has high bonding strength. QDC-501 underwater epoxy material has the following characteristics:

[0062] Good thixotropy and no flow during construction.

[0063] It has good fatigue resistance and impact resistance.

[0064] Good resistance to medium corrosion.

[0065] It does not contain volatile solvents and can be 100% cured into a film, which is environmentally friendly and economical.

[0066] The operation is simple, it can be directly applied underwater, and the construction process is good.

[0067] Furthermore, the step of pasting the flexible anti-seepage cover sheet also includes: before pasting the flexible anti-seepage cover sheet 9, leveling the water-facing surface of the crack of the rockfill dam panel 1 to ensure the tight fit between the flexible anti-seepage cover sheet 9 and the rockfill dam panel 1. Before pasting the flexible anti-seepage cover sheet 9, the water-facing surface of the crack of the rockfill dam panel 1 is leveled to ensure that the flexible anti-seepage cover sheet 9 can fit tightly with the rockfill dam panel 1. The leveling treatment can remove the uneven parts of the water-facing surface, increase the adhesion of the underwater adhesive 10, and ensure the effective pasting of the flexible anti-seepage cover sheet 9. Through the leveling treatment, the tight fit between the flexible anti-seepage cover sheet 9 and the rockfill dam panel 1 can be ensured, further improving the anti-seepage effect and structural stability. The leveling treatment increases the adhesion of the underwater adhesive 10, ensures the firm bonding of the flexible anti-seepage cover sheet 9, reduces the risk of leakage, and extends the service life of the rockfill dam panel 1.

[0068] In some embodiments, the leveling method and tools can be adjusted according to actual needs to ensure the flatness and bonding effect of the water-facing surface.

[0069] Furthermore, the underwater adhesive is a mixture of epoxy resin and curing agent in a weight ratio of 3:1 to 5:1, and is directly applied underwater after being fully stirred. By using the underwater adhesive 10 mixed with epoxy resin and curing agent, a good bonding effect in an underwater environment can be ensured, and the bonding force and stability of the flexible anti-seepage cover sheet 9 and other filling materials can be increased. Epoxy resin has excellent water resistance and durability, ensuring a long-term sealing effect of cracks in the rockfill dam panel 1.

[0070] In some embodiments, the underwater adhesive 10 preferably uses QDC-501 underwater epoxy material, wherein the QDC-501 underwater epoxy material is a mixture of epoxy resin and curing agent in a weight ratio of 3:1 to 5:1.

[0071] The preparation and application methods of QDC-501 underwater epoxy material are as follows:

[0072] 1) Preparation method: QDC-501 underwater epoxy material is mixed with epoxy resin and curing agent in a weight ratio of 3:1~5:1, and the two components are mixed evenly after being fully stirred. The preparation amount of QDC-501 underwater epoxy material should not be too large. It should be used while being prepared according to the site conditions and the operable time of QDC-501 underwater epoxy material. It can be appropriately adjusted according to the temperature and underwater use conditions.

[0073] 2) Painting method: Use a brush or putty knife to dip an appropriate amount of QDC-501 underwater epoxy material and paint it on the concrete surface; apply force evenly and try to paint in one direction; the painting thickness should be based on the vertical surface without flowing.

[0074] Furthermore, the underwater treatment method for the fracture of the rockfill dam panel also includes an underwater inspection step: the diver dives underwater to inspect the rockfill dam panel and records the location, width, depth and leakage of the cracks in the rockfill dam panel, wherein the entire inspection process is recorded and followed up and guided by the technicians on the water. Through the underwater inspection step, the diver dives underwater to conduct a detailed inspection of the rockfill dam panel 1 and records the location, width, depth and leakage of the cracks in the rockfill dam panel 1. The entire inspection process is recorded, and the technicians on the water provide follow-up guidance to ensure the comprehensiveness and accuracy of the inspection process. Through the underwater inspection step, the detailed situation of the cracks in the rockfill dam panel 1 can be fully grasped, providing accurate basic data for the subsequent processing steps. The full recording and follow-up guidance of the technicians ensure the accuracy and reliability of the inspection process, which helps to formulate a more effective treatment plan and improve the treatment effect and efficiency.

[0075] In some embodiments, the methods and tools for underwater inspection can be adjusted according to actual needs to ensure the comprehensiveness and accuracy of the inspection process. Different types of detection equipment and recording methods can be selected according to specific circumstances to meet different inspection needs. The operating methods and technical guidance of divers can also be adjusted according to specific environments and working conditions to ensure the best results of the inspection process.

[0076] Furthermore, the underwater treatment method for rockfill dam panel fractures also includes an acceptance step: checking the seepage of the rockfill dam. If the seepage of the rockfill dam drops to a predetermined standard, the acceptance is qualified, otherwise it fails. After completing the treatment of the cracks in the rockfill dam panel 1, the seepage of the rockfill dam is checked through the acceptance step. If the seepage of the rockfill dam drops to a predetermined standard, the acceptance is qualified, otherwise it fails. The acceptance step ensures that the treatment effect meets the expected standard and guarantees the overall stability and safety of the rockfill dam. Through the acceptance step, it can be ensured that the treatment effect of the cracks in the rockfill dam panel 1 meets the predetermined standard and guarantees the overall stability and safety of the rockfill dam. The acceptance step provides a clear judgment standard to ensure the controllability and reliability of the treatment effect and improve the service life and safety of the rockfill dam.

[0077] In some embodiments, the judgment criteria and detection methods of the acceptance step can be adjusted according to actual needs to ensure accurate evaluation of the treatment effect. Different types of detection equipment and judgment criteria can be selected according to specific circumstances to meet different acceptance requirements. The operating methods and technical guidance of the acceptance step can also be adjusted according to the specific environment and working conditions to ensure the best results of the acceptance process.

[0078] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An underwater treatment method for rockfill dam face plate fracture, characterized in that: The following steps are involved: Temporary plugging steps: Use underwater rapid plugging materials to temporarily plug the cracks in the rockfill dam face plate to prevent leakage; Flexible grouting steps: For the parts of the rockfill dam panel cracks close to the structural joints on both sides, the flexible grouting material is poured by gravity pouring until the flexible grouting material fills the rockfill dam panel cracks and the surrounding leakage channels and the adjacent structural joints; Rigid grouting steps: Gravity pour rigid grouting materials into the gaps between the rockfill dam face plate and cushion layer until the gaps are filled; Steps for removing temporary plugging: remove underwater rapid plugging materials and clean up the temporary plugging part; Crack surface filling steps: fill the cracks according to their size. The cracks are divided into Class I cracks and Class II cracks. Class I cracks are filled with flexible filling materials, and Class II cracks are filled with flexible grouting materials; The flexible grouting step further comprises opening a flexible grouting hole at the position of the crack of the rockfill dam panel close to the structural seams on both sides, wherein the flexible grouting hole is an inclined hole, and pouring the flexible grouting material into the flexible grouting hole by gravity pouring to fill the crack of the rockfill dam panel and the leakage channel around it together with the adjacent structural seams; The rigid grouting step also includes opening a plurality of rigid grouting holes along the length direction of the cracks in the rockfill dam panel, wherein the rigid grouting holes are inclined holes, and rigid grouting materials are poured into the plurality of rigid grouting holes by gravity pouring into the hollowed-out parts of the rockfill dam panel and the cushion layer until the hollowed-out parts of the rockfill dam panel and the cushion layer are filled.

2. The underwater treatment method for rockfill dam face plate fracture according to claim 1 is characterized in that: In the crack surface filling step, a specific method for filling a type of crack with a flexible filling material is: a U-shaped groove is opened at the type of crack, the bottom of the U-shaped groove is filled with underwater rapid sealing material, underwater adhesive is applied on both sides of the U-shaped groove, and the U-shaped groove is filled with flexible filling material.

3. The underwater treatment method for rockfill dam face plate fracture according to claim 2 is characterized in that: The upper width of the U-shaped groove is 8 cm, the groove depth is 6 cm, and the groove bottom width is 4 cm.

4. The underwater treatment method for rockfill dam face plate fracture according to claim 1 is characterized in that: The method also includes the step of pasting a flexible anti-seepage cover sheet: firstly, the water-facing surface of the cracks in the rockfill dam panel is coated with an underwater adhesive, and then the flexible anti-seepage cover sheet is pasted to cover the entire area of ​​the cracks in the rockfill dam panel.

5. The underwater treatment method for rockfill dam face plate fracture according to claim 4 is characterized in that: The step of pasting the flexible anti-seepage cover sheet also includes: before pasting the flexible anti-seepage cover sheet, leveling the water-facing surface of the cracks in the rockfill dam panel to ensure a tight fit between the flexible anti-seepage cover sheet and the rockfill dam panel.

6. The underwater treatment method for rockfill dam face plate fracture according to claim 2 or 4, characterized in that: The underwater adhesive is prepared by mixing epoxy resin and curing agent in a weight ratio of 3:1 to 5:1, and is directly applied underwater after being fully stirred.

7. The underwater treatment method for rockfill dam face plate fracture according to claim 1 is characterized in that: It also includes underwater inspection steps: divers dive underwater to inspect the rockfill dam panels and record the location, width, depth and leakage of cracks in the rockfill dam panels. The entire inspection process is recorded and tracked and guided by water technicians.

8. The underwater treatment method for rockfill dam face plate fracture according to claim 1 is characterized in that: It also includes an acceptance step: checking the seepage of the rockfill dam. If the seepage of the rockfill dam drops to the predetermined standard, the acceptance is qualified, otherwise it is unqualified.

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