Anti-seepage reinforcing device for earth and rockfill dam

Abstract

The anti-seepage reinforcing device comprises a multi-head small-diameter stirring pile structure, a high-pressure jet grouting pile structure and a curtain grouting structure, wherein the multi-head small-diameter stirring pile structure, the high-pressure jet grouting pile structure and the curtain grouting structure are located below a dam crest structure of the earth and rockfill dam and extend in the length direction of the earth and rockfill dam. The multi-head small-diameter stirring pile structure is adjacent to the high-pressure jet grouting pile structure and is located on the downstream side of the high-pressure jet grouting pile structure, and the lower parts of the multi-head small-diameter stirring pile structure and the high-pressure jet grouting pile structure are connected with the upper part of the curtain grouting structure; the upper end of the multi-head small-diameter mixing pile structure is positioned in the upper part of the dam body filling soil, and the lower end is flush with the upper end of the bedrock; the upper end of the high-pressure jet grouting pile structure is located in the lower portion of the dam body filling soil, and the lower end extends into the upper portion of the bed rock. The upper end of the curtain grouting structure is located in the lower portion of the dam body filling soil, the lower end of the curtain grouting structure extends to the lower end of the bed rock, and the upper end of the curtain grouting structure is lower than the upper end of the high-pressure jet grouting pile structure. The anti-seepage effect of the earth and rockfill dam can be improved, and the anti-seepage safety of the earth and rockfill dam is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic and hydropower engineering, and in particular relates to an anti-seepage reinforcement device for earth-rock dams. Background Art

[0002] During the long-term operation of the reservoir, there are various degrees of damage, leakage and other hidden dangers. In order to ensure the safe operation of the reservoir, the dam of the reservoir needs to be treated for anti-seepage. The proportion of earth-rock dams in the built reservoirs is very high. Due to the limitations of the economic and technical conditions at the time, the reservoir dams have serious leakage, which makes it difficult to store water, or there are prominent problems of seepage damage that endanger the safety of the dam. Some dams have large-scale diffuse infiltration on the back slope, and some dams have concentrated leakage channels at the foot of the dam.

[0003] The main treatment methods currently used include plastic concrete anti-seepage wall, curtain grouting, geomembrane, etc. Among them, although the anti-seepage treatment effect of plastic concrete anti-seepage wall is good, the cost is relatively high; the cost of curtain grouting is slightly lower, but the durability is poor, especially when the dam foundation is a sand and gravel layer, the grouting effect is extremely poor; the construction process of geomembrane is relatively complex and the durability is poor. Therefore, considering that on the basis of not destroying the original dam surface slope protection structure, the use of a single anti-seepage reinforcement method does not conform to the current trend of safe, economical, and high-quality development. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the present invention provides an anti-seepage reinforcement device for an earth-rock dam, which can improve the anti-seepage effect of the earth-rock dam and ensure the safety of the anti-seepage of the earth-rock dam.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A seepage prevention and reinforcement device for an earth-rock dam, wherein the dam body fill of the earth-rock dam is arranged on silty clay, the lower end of the silty clay is bedrock, a slope protection structure is arranged on the water-facing dam surface of the dam body fill and a dam crest structure is arranged on the top, and a wave-breaking wall is arranged at the junction between the slope protection structure and the dam crest structure on the dam body fill, the seepage prevention and reinforcement device comprises a multi-head small-diameter mixing pile structure, a high-pressure rotary jet pile structure and a curtain grouting structure which are located on the downstream side of the wave-breaking wall and below the dam crest structure and extend along the length direction of the earth-rock dam, the multi-head small-diameter mixing pile structure is adjacent to the high-pressure rotary jet pile structure and is located in the high-pressure rotary jet pile structure On the downstream side, the lower parts of the multi-head small-diameter mixing pile structure and the high-pressure rotary jet pile structure are connected to the upper part of the curtain grouting structure; the upper end of the multi-head small-diameter mixing pile structure is located in the upper part of the dam body fill, and the lower end passes through the silty clay and is flush with the upper end of the bedrock; the upper end of the high-pressure rotary jet pile structure is located in the lower part of the dam body fill, and the lower end passes through the silty clay and extends to the upper part of the bedrock; the upper end of the curtain grouting structure is located in the lower part of the dam body fill, and the lower end passes through the silty clay and extends to the lower end of the bedrock, and the upper end height of the curtain grouting structure is lower than the upper end height of the high-pressure rotary jet pile structure.

[0007] Furthermore, the multi-head small-diameter mixing pile structure and the high-pressure rotary jet grouting pile structure are both arranged in the middle of the earth-rock dam.

[0008] Furthermore, the multi-head small-diameter mixing pile structure includes a plurality of multi-head small-diameter mixing pile positions which are vertically arranged side by side from front to back along the length direction of the earth-rock dam, the upper end of each of the multi-head small-diameter mixing pile positions is flush and located in the upper part of the dam body fill, and the lower end passes through the silty clay and is flush with the upper end of the bedrock.

[0009] Furthermore, the upper end height of each of the multi-head small-diameter mixing piles is higher than the verified flood level of the earth-rock dam reservoir.

[0010] Furthermore, adjacent multi-head small-diameter mixing piles are connected with each other through holes.

[0011] Furthermore, the high-pressure rotary jet grouting pile structure includes a plurality of high-pressure rotary jet grouting pile positions which are vertically arranged side by side from front to back along the length direction of the earth-rock dam, the upper end of each of the high-pressure rotary jet grouting pile positions being flush and located in the lower part of the dam body fill and the lower end being flush and extending through the silty clay to the upper part of the bedrock.

[0012] Furthermore, the adjacent high-pressure rotary jet grouting pile positions are connected by casing holes; each of the multi-head small-diameter mixing pile positions is connected by casing holes between adjacent high-pressure rotary jet grouting pile positions.

[0013] Furthermore, the curtain grouting structure includes a plurality of vertical curtain grouting holes arranged side by side from front to back along the length direction of the earth-rock dam, the upper end of each of the curtain grouting holes is flush and located in the lower part of the dam body fill, and the lower end passes through the silty clay and extends to the lower end of the bedrock, and the upper end height of the curtain grouting hole is lower than the upper end height of the high-pressure rotary jet pile position.

[0014] Furthermore, each of the curtain grouting holes is connected to the casing holes between adjacent multi-head small-diameter mixing piles, and is also connected to the casing holes between adjacent high-pressure jet-jet piles.

[0015] Furthermore, it also includes a slurry guide groove arranged on the dam top structure and extending along the length direction of the earth-rock dam, and each of the multiple small-diameter mixing piles is located below the slurry guide groove, and the construction of the multiple small-diameter mixing pile structure is carried out through the slurry guide groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The anti-seepage reinforcement device for earth-rock dams in the present invention comprises a multi-head small-diameter mixing pile structure, a high-pressure rotary jet pile structure and a curtain grouting structure, which are located on the downstream side of the wave-breaking wall and below the dam top structure and extend along the length direction of the earth-rock dam. The multi-head small-diameter mixing pile structure is adjacent to the high-pressure rotary jet pile structure and is located on the downstream side of the high-pressure rotary jet pile structure. The lower parts of the multi-head small-diameter mixing pile structure and the high-pressure rotary jet pile structure are both connected to the upper part of the curtain grouting structure; the upper end of the multi-head small-diameter mixing pile structure is located in the upper part of the dam body filling, and the lower end passes through the silty clay and is flush with the upper end of the bedrock; the upper end of the high-pressure rotary jet pile structure is located in the lower part of the dam body filling, and the lower end passes through the silty clay and extends to the upper part of the bedrock; the upper end of the curtain grouting structure is located in the lower part of the dam body filling, and the lower end passes through the silty clay and extends to the lower end of the bedrock, and the upper end height of the curtain grouting structure is lower than the upper end height of the high-pressure rotary jet pile structure. Since the multi-head small-diameter mixing pile structure cannot extend into the hard bedrock, the lower end of the multi-head small-diameter mixing pile structure is flush with the upper end of the bedrock. The high-pressure rotary jet pile structure is suitable for a wide range of foundation conditions. The upper end of the high-pressure rotary jet pile structure is located in the lower part of the dam body fill and the lower end passes through the silty clay and extends to the upper part of the bedrock. In this way, the high-pressure rotary jet pile structure can be used as an anti-seepage reinforcement measure between the dam body fill and the bedrock of the earth-rock dam. The anti-seepage wall formed by the combination of the multi-head small-diameter mixing pile structure and the high-pressure rotary jet pile structure has an obvious head reduction effect, which can reduce the infiltration line of the dam body fill of the earth-rock dam and improve the anti-seepage effect, so as to ensure the safety of the anti-seepage of the earth-rock dam. In addition, the upper end of the curtain grouting structure is located in the lower part of the dam body fill and the lower end passes through the silty clay and extends to the lower end of the bedrock. Since the lower end of the high-pressure rotary jet pile structure extends into the upper part of the bedrock, the connection effect with the curtain grouting structure can be enhanced.

[0018] In the present invention, the upper end height of each multi-head small diameter mixing pile is higher than the verified flood level of the earth-rock dam reservoir. Thus, when the upstream water level of the earth-rock dam is raised to the verified flood level of the earth-rock dam reservoir, the anti-seepage effect of the upper part of the dam body fill of the earth-rock dam can be guaranteed.

[0019] In the present invention, the adjacent multi-head small-diameter mixing piles are connected with each other through holes; the adjacent high-pressure rotary jet piles are connected with each other through holes; and each multi-head small-diameter mixing pile is connected with the adjacent high-pressure rotary jet piles through holes. In this way, the anti-seepage safety of the earth-rock dam is ensured while saving investment to a certain extent.

[0020] In the present invention, the anti-seepage reinforcement device also includes a slurry guide groove arranged on the dam top structure and extending along the length direction of the earth-rock dam, and each multi-head small-diameter stirring pile is located below the slurry guide groove. In this way, the construction of the multi-head small-diameter stirring pile structure through the slurry guide groove can prevent the mud from flowing out and damaging the water quality of the earth-rock dam reservoir, and at the same time keep the construction site clean.

[0021] The present invention adopts an anti-seepage reinforcement method that combines a multi-head small-diameter mixing pile structure, a high-pressure rotary jet pile structure and a curtain grouting structure, which can not only ensure the construction quality and reduce the risk of damage to the anti-seepage wall formed in the earth-rock dam, but also save investment under the premise of ensuring the safety of the anti-seepage wall; in addition, considering that most of the existing earth-rock dam reservoirs are in normal operation, it is not appropriate to lower the dam top elevation to increase the width of the construction platform. The advantage of the multi-head small-diameter mixing pile structure and the high-pressure rotary jet pile structure for the lower requirement on the width of the construction platform working surface can reduce the requirements for the construction platform working surface, which is of great significance for construction cost control. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the arrangement of the anti-seepage reinforcement device for earth-rock dam in the present invention inside the earth-rock dam;

[0023] Figure 2 This is a pile position distribution diagram of the anti-seepage reinforcement device for earth-rock dams in the present invention.

[0024] Explanation of the reference numerals in the figure: 101, dam body fill, 102, silty clay, 103, bedrock, 104, slope protection structure, 105, dam top structure, 106, wave-breaking wall, 201, multi-head small-diameter mixing pile structure, 20101, multi-head small-diameter mixing pile position, 202, high-pressure rotary jet pile structure, 20201, high-pressure rotary jet pile position, 203, curtain grouting structure, 20301, curtain grouting hole position, 204, grouting groove. DETAILED DESCRIPTION

[0025] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0029] like Figure 1As shown, an anti-seepage reinforcement device for an earth-rock dam, wherein a dam body fill 101 of the earth-rock dam is arranged on silty clay 102, the lower end of the silty clay 102 is bedrock 103, a slope protection structure 104 is arranged on the water-facing dam surface of the dam body fill 101, and a dam crest structure 105 is arranged on the top, a wave-breaking wall 106 is arranged on the dam body fill 101 at the junction between the slope protection structure 104 and the dam crest structure 105, and the anti-seepage reinforcement device comprises a multi-head small-diameter mixing pile structure 201, a high-pressure rotary jet pile structure 202 and a curtain grouting structure 203 which are located on the downstream side of the wave-breaking wall 106 and below the dam crest structure 105 and extend along the length direction of the earth-rock dam, the multi-head small-diameter mixing pile structure 201 is adjacent to the high-pressure rotary jet pile structure 202 and is located in the high-pressure rotary jet pile structure 203. On the downstream side of the spray pile structure 202, the lower parts of the multi-head small-diameter mixing pile structure 201 and the high-pressure rotary spray pile structure 202 are connected to the upper part of the curtain grouting structure 203; the upper end of the multi-head small-diameter mixing pile structure 201 is located in the upper part of the dam body filling 101, and the lower end passes through the silty clay 102 and is flush with the upper end of the bedrock 103; the upper end of the high-pressure rotary spray pile structure 202 is located in the lower part of the dam body filling 101, and the lower end passes through the silty clay 102 and extends to the upper part of the bedrock 103; the upper end of the curtain grouting structure 203 is located in the lower part of the dam body filling 101, and the lower end passes through the silty clay 102 and extends to the lower end of the bedrock 103, and the upper end height of the curtain grouting structure 203 is lower than the upper end height of the high-pressure rotary spray pile structure 202. The dam body filling 101 of the earth-rock dam is a homogeneous earth dam. The multiple small diameter mixing pile structure 201 and the high pressure rotary jet pile structure 202 are both arranged in the middle of the earth-rock dam. The multiple small diameter mixing pile structure 201 is closely connected with the high pressure rotary jet pile structure 202 after grouting. The slope protection structure 104 includes a geomembrane laid on the dam body fill 101 on the water-facing dam surface, and a plurality of prefabricated blocks are arranged on the geomembrane, wherein the dam top structure 105 is an asphalt pavement structure.

[0030] Since the multi-head small-diameter mixing pile structure 201 cannot extend into the hard bedrock 103, the lower end of the multi-head small-diameter mixing pile structure 201 is flush with the upper end of the bedrock 103. The high-pressure rotary jet pile structure 202 is suitable for a wide range of foundation conditions. The upper end of the high-pressure rotary jet pile structure 202 is located in the lower part of the dam body filling 101 and the lower end passes through the silty clay 102 and extends to the upper part of the bedrock 103. In this way, the high-pressure rotary jet pile structure 202 can be used as an anti-seepage reinforcement measure between the dam body filling 101 and the bedrock 103 of the earth-rock dam, and the multi-head small-diameter mixing pile structure 201 can be used as an anti-seepage reinforcement measure between the dam body filling 101 and the bedrock 103. The anti-seepage wall formed by the combination of the diameter mixing pile structure 201 and the high-pressure rotary jet pile structure 202 has a significant head reduction effect, which can reduce the infiltration line of the dam body fill 101 of the earth-rock dam and improve the anti-seepage effect to ensure the safety of the anti-seepage of the earth-rock dam; in addition, the upper end of the curtain grouting structure 203 is located in the lower part of the dam body fill 101 and the lower end passes through the silty clay 102 and extends to the lower end of the bedrock 103. Since the lower end of the high-pressure rotary jet pile structure 202 extends into the upper part of the bedrock 103, the connection effect with the curtain grouting structure 203 can be enhanced.

[0031] Among them, Figure 2 As shown, the multi-head small-diameter mixing pile structure 201 includes a plurality of multi-head small-diameter mixing pile positions 20101 which are vertically arranged side by side from front to back along the length direction of the earth-rock dam. The upper end of each multi-head small-diameter mixing pile position 20101 is flush with and located in the upper part of the dam body fill 101, and the lower end passes through the silty clay 102 and is flush with the upper end of the bedrock 103.

[0032] Preferably, the upper end height of each multi-head small diameter mixing pile position 20101 is higher than the verified flood level of the earth-rock dam reservoir. In this way, when the upstream water level of the earth-rock dam rises to the verified flood level of the earth-rock dam reservoir, the anti-seepage effect of the upper part of the dam body fill 101 of the earth-rock dam can be guaranteed.

[0033] Preferably, the adjacent multi-head small-diameter mixing pile positions 20101 are connected by casing holes. In this way, while ensuring the anti-seepage safety of the earth-rock dam, investment can be saved to a certain extent.

[0034] Among them, Figure 2 As shown, the high-pressure jet grouting pile structure 202 includes a plurality of high-pressure jet grouting pile positions 20201 vertically arranged side by side from front to back along the length direction of the earth-rock dam, and the upper end of each high-pressure jet grouting pile position 20201 is flush and located in the lower part of the dam body fill 101, and the lower end is flush and extends through the silty clay 102 to the upper part of the bedrock 103. Preferably, the vertical spacing between the upper end of the high-pressure jet grouting pile position 20201 and the upper end of the bedrock 103 is 5m.

[0035] Preferably, the adjacent high-pressure jet grouting pile positions 20201 are connected by casing holes, and each multi-head small-diameter mixing pile position 20101 is connected by casing holes between adjacent high-pressure jet grouting pile positions 20201. This can save investment to a certain extent while ensuring the anti-seepage safety of the earth-rock dam.

[0036] Among them, Figure 1 As shown, the curtain grouting structure 203 includes a plurality of vertical curtain grouting holes 20301 arranged side by side from front to back along the length direction of the earth-rock dam, the upper end of each curtain grouting hole 20301 is flush and located in the lower part of the dam body fill 101, and the lower end passes through the silty clay 102 and extends to the lower end of the bedrock 103, and the upper end height of the curtain grouting hole 20301 is lower than the upper end height of the high-pressure rotary jet pile position 20201.

[0037] Preferably, each curtain grouting hole 20301 is connected to the adjacent multi-head small diameter mixing pile positions 20101, and is connected to the adjacent high pressure jet grouting pile positions 20201. This can save investment to a certain extent while ensuring the anti-seepage safety of the earth-rock dam.

[0038] Among them, Figure 1 As shown, the anti-seepage reinforcement device also includes a slurry guide groove 204 arranged on the dam top structure 105 and extending along the length direction of the earth-rock dam, and each multi-head small-diameter stirring pile position 20101 is located below the slurry guide groove 204. In this way, the construction of the multi-head small-diameter stirring pile structure 201 through the slurry guide groove 204 can prevent the mud from flowing out and damaging the water quality of the earth-rock dam reservoir, and at the same time keep the construction site clean.

[0039] In the present invention, the sizes of each multi-head small-diameter mixing pile position 20101 and each high-pressure rotary jet pile position 20201 are obtained through dam seepage calculation and analysis, which ensures seepage safety while optimizing investment.

[0040] The present invention optimizes the conventional single-type plastic concrete anti-seepage wall, curtain grouting or geomembrane into a type that combines a multi-head small-diameter mixing pile structure 201, a high-pressure rotary jet pile structure 202 and a curtain grouting structure 203. On the premise of improving construction quality and saving project investment, the infiltration line of the dam body fill 101 of the earth-rock dam is reduced to ensure the safety of the earth-rock dam's anti-seepage.

[0041] In the present invention, the multi-head small-diameter mixing pile structure 201, the high-pressure rotary jet pile structure 202 and the curtain grouting structure 203 are combined to form an upper wall and lower curtain type, which jointly play a vertical anti-seepage role, among which the multi-head small-diameter mixing pile structure 201 plays the role of the main anti-seepage wall, and the high-pressure rotary jet pile structure 202 plays the role of anti-seepage reinforcement of the dam.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An anti-seepage reinforcement device for an earth-rock dam, wherein the dam body fill (101) of the earth-rock dam is arranged on silty clay (102), the lower end of the silty clay (102) is bedrock (103), a slope protection structure (104) is arranged on the water-facing dam surface of the dam body fill (101) and a dam crest structure (105) is arranged on the top, and a wave-breaking wall (106) is arranged on the dam body fill (101) at the junction between the slope protection structure (104) and the dam crest structure (105), characterized in that: The anti-seepage reinforcement device comprises a multi-head small-diameter mixing pile structure (201), a high-pressure rotary jet pile structure (202) and a curtain grouting structure (203) which are located at the downstream side of the wave-breaking wall (106) and below the dam top structure (105) and extend along the length direction of the earth-rock dam. The multi-head small-diameter mixing pile structure (201) is adjacent to the high-pressure rotary jet pile structure (202) and is located at the downstream side of the high-pressure rotary jet pile structure (202). The lower parts of the multi-head small-diameter mixing pile structure (201) and the high-pressure rotary jet pile structure (202) are connected to the curtain grouting structure (203). 03); the upper end of the multi-head small-diameter mixing pile structure (201) is located in the upper part of the dam body fill (101) and the lower end is flush with the upper end of the bedrock (103); the upper end of the high-pressure rotary jet pile structure (202) is located in the lower part of the dam body fill (101) and the lower end extends to the upper part of the bedrock (103); the upper end of the curtain grouting structure (203) is located in the lower part of the dam body fill (101) and the lower end extends to the lower end of the bedrock (103), and the upper end of the curtain grouting structure (203) is lower than the upper end of the high-pressure rotary jet pile structure (202).

2. The anti-seepage reinforcement device for earth-rock dam according to claim 1, characterized in that: The multi-head small-diameter mixing pile structure (201) and the high-pressure jet-jet pile structure (202) are both arranged in the middle of the earth-rock dam.

3. The anti-seepage reinforcement device for earth-rock dam according to claim 1, characterized in that: The multi-head small-diameter mixing pile structure (201) comprises a plurality of multi-head small-diameter mixing pile positions (20101) vertically arranged side by side from front to back along the length direction of the earth-rock dam, the upper end of each multi-head small-diameter mixing pile position (20101) being flush and located in the upper part of the dam body fill (101) and the lower end passing through the silty clay (102) and being flush with the upper end of the bedrock (103).

4. The anti-seepage reinforcement device for earth-rock dam according to claim 3, characterized in that: The upper end height of each of the multi-head small-diameter mixing pile positions (20101) is higher than the verified flood level of the earth-rock dam reservoir.

5. The anti-seepage reinforcement device for earth-rock dam according to claim 3, characterized in that: The adjacent multi-head small-diameter mixing pile positions (20101) are connected by holes.

6. The anti-seepage reinforcement device for earth-rock dam according to claim 3, characterized in that: The high-pressure jet grouting pile structure (202) comprises a plurality of high-pressure jet grouting pile positions (20201) vertically arranged side by side from front to back along the length direction of the earth-rock dam, wherein the upper end of each high-pressure jet grouting pile position (20201) is flush with and located in the lower part of the dam body fill (101), and the lower end is flush with and extends through the silty clay (102) to the upper part of the bedrock (103).

7. The anti-seepage reinforcement device for earth-rock dam according to claim 6, characterized in that: The adjacent high-pressure jet grouting pile positions (20201) are connected by casing holes; each of the multi-head small-diameter mixing pile positions (20101) is connected by casing holes between adjacent high-pressure jet grouting pile positions (20201).

8. The anti-seepage reinforcement device for earth-rock dam according to claim 6, characterized in that: The curtain grouting structure (203) comprises a plurality of vertical curtain grouting holes (20301) arranged side by side from front to back along the length direction of the earth-rock dam, the upper end of each curtain grouting hole (20301) is flush and located in the lower part of the dam body fill (101), and the lower end passes through the silty clay (102) and extends to the lower end of the bedrock (103), and the upper end height of the curtain grouting hole (20301) is lower than the upper end height of the high-pressure rotary jet pile position (2201).

9. The anti-seepage reinforcement device for earth-rock dam according to claim 8, characterized in that: Each of the curtain grouting hole positions (20301) is connected to the casing holes between adjacent multi-head small-diameter mixing pile positions (20101), and is also connected to the casing holes between adjacent high-pressure jet-jet pile positions (20201).

10. The anti-seepage reinforcement device for earth-rock dam according to claim 3, characterized in that: It also includes a slurry guide groove (204) arranged on the dam top structure (105) and extending along the length direction of the earth-rock dam, and each of the multiple small-diameter mixing pile positions (20101) is located below the slurry guide groove (204), and the construction of the multiple small-diameter mixing pile structure (201) is carried out through the slurry guide groove (204).

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