Earth and rockfill dam partition structure considering downstream pressure slope body effect

Abstract

The utility model relates to the technical field of dam body structures of earth and rockfill dams, and discloses an earth and rockfill dam partition structure considering the downstream slope pressing effect. The dam body mainly comprises a main rockfill area, a secondary rockfill area and a pressure slope body, the main rockfill area, the secondary rockfill area and the pressure slope body are sequentially arranged from the upstream to the downstream of a riverbed, and the deformation modulus is sequentially reduced. The pressure slope body acts on the secondary rockfill area through the self weight of the pressure slope body, deformation of the secondary rockfill area towards the downstream side can be relieved, the dam body is prevented from sliding, meanwhile, the control effect of the main rockfill area on vertical sedimentation of the dam body is not affected, and the overall shape and structural stability of the dam body are guaranteed. At the moment, the strength range of the secondary rockfill area is widened, the area proportion of the secondary rockfill area and the pressure slope body partition area is adjustable, the filling range can be increased or decreased according to material classification and quantity, the material utilization rate is effectively increased, the excavation and filling engineering amount is reduced on the whole, and the technical economy is improved.

Description

Technical Field

[0001] This utility model relates to the field of earth-rock dam structure technology, and in particular to a zoned structure for earth-rock dams that takes into account the effect of downstream slope compression. Background Technology

[0002] Traditional earth-rock dams, lacking downstream slope protection, require secondary rockfill with sufficient strength and a suitable slope gradient for slope stability. However, with the development of water conservancy and hydropower, many reservoirs, conventional hydropower stations, and pumped storage power stations are being built in areas with low rock strength and deeper weathering. Simultaneously, environmental protection and water conservation requirements are increasing, and zero waste disposal has become a goal for dam construction. Therefore, slope protection structures are often installed on the downstream slope to absorb more waste material, thus contributing to the stability of the downstream slope. However, currently, most projects still design dam sections based on the assumption of no slope protection structure, treating the slope protection structure as an extra, surplus component, resulting in widespread waste of materials on dam slopes. Utility Model Content

[0003] This utility model aims to provide a partitioned structure for earth-rock dams that takes into account the effect of downstream slope compression, in order to solve the technical problems raised in the prior art.

[0004] The technical problem solved by this utility model embodiment is addressed by the following technical solution:

[0005] A partitioned structure for an earth-rock dam that takes into account the downstream slope action is provided, including:

[0006] The dam body includes a main rockfill area, a secondary rockfill area, and a slope protection structure.

[0007] Along the riverbed from upstream to downstream, the main rockfill area, the secondary rockfill area, and the slope protection body are arranged sequentially, and the secondary rockfill area and the slope protection body are an integral structure. The slope protection body can prevent the dam body from sliding or slow down the deformation downstream, thereby reducing the amount of filling in the secondary rockfill area.

[0008] In some embodiments, the slope compaction body includes a slope compaction platform, a first contact surface is formed between the secondary rockfill area and the slope compaction body, and the slope compaction body extends downward from the slope compaction platform along the first contact surface.

[0009] In some embodiments, the slope of the secondary rockfill area and the first contact surface is 0-60°.

[0010] In some embodiments, a second contact surface is formed between the secondary rockfill area and the main rockfill area, and the slope ratio of the first contact surface is between 1:0.2 and 1:0.6, to ensure that the control effect of the main rockfill area on the vertical settlement of the dam body is not affected.

[0011] In some embodiments, the dam foundation is also included, which is disposed at the bottom of the dam body, and a drainage body is disposed between the dam foundation and the dam body.

[0012] In some embodiments, a filter layer is provided between the drainage body and the dam body, and between the drainage body and the dam foundation, respectively. The filter layer is used to restrict fine particles from the dam foundation and the dam body from entering the interior of the drainage body.

[0013] In some embodiments, the dam body is further provided with a seepage-proof panel, a cushion material, and a transition material, which are sequentially arranged on the upstream side of the main rockfill area.

[0014] Compared with existing technologies, in the earth-rock dam zoning structure considering the downstream slope protection provided in this embodiment of the invention, the dam body mainly includes a main rockfill zone, a secondary rockfill zone, and a slope protection body. These zones are sequentially arranged from upstream to downstream along the riverbed, with their deformation moduli decreasing sequentially. The slope protection body, with its own weight, acts on the secondary rockfill zone, mitigating its downstream deformation and preventing dam slippage. Simultaneously, it does not affect the control of the main rockfill zone on the vertical settlement of the dam body, ensuring the overall shape and structural stability of the dam. In this way, the strength range of the secondary rockfill zone is broadened, its area ratio with the slope protection body is adjustable, and the filling range can be increased or decreased according to the material classification and quantity, effectively improving material utilization and thus reducing the overall excavation and filling work, thereby improving technical and economic efficiency. Attached Figure Description

[0015] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0016] Figure 1 This is a schematic plan view of a partitioned earth-rock dam structure considering the downstream slope action, provided in one embodiment of this utility model.

[0017] Figure label:

[0018] 100. Zonal structure of earth-rock dam considering downstream slope action; 10. Dam body; 11. Main rockfill area; 12. Secondary rockfill area; 13. Slope action; 131. Slope action platform; 132. First contact surface; 133. Second contact surface; 14. Filter layer; 15. Drainage body; 16. Dam foundation. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as "connected" to another element, it can be directly on the other element, or one or more intermediate elements may exist between them. The terms "upper," "lower," "left," "right," "upper end," "lower end," "top," and "bottom," etc., used in this specification, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0021] The following is combined Figure 1 The earth-rock dam zoning structure provided in this application will be described in detail through specific embodiments.

[0022] Please see Figure 1 , Figure 1 This is a plan view of the earth-rock dam partition structure provided in one embodiment of the present invention. The earth-rock dam partition structure 100 provided in one embodiment of the present invention includes a dam body 10. The dam body 10 includes a main rockfill zone 11, a secondary rockfill zone 12, and a slope retainer 13; wherein, along the upstream to downstream of the riverbed, the main rockfill zone 11, the secondary rockfill zone 12, and the slope retainer 13 are arranged sequentially, and the secondary rockfill zone 12 and the slope retainer 13 are an integral structure. The secondary rockfill zone 12 can prevent the dam body 10 from sliding or slow down downstream deformation, thereby reducing the amount of fill in the secondary rockfill zone 12.

[0023] By incorporating a slope retainer 13 and integrating it with the secondary rockfill zone 12 as a single structure, the slope retainer 13 and the secondary rockfill zone 12 can jointly constrain deformation of the dam body 10 (such as settlement or lateral displacement). During water impoundment, the dam body 10 may experience settlement due to soil compression and seepage, or lateral displacement under lateral water pressure. The slope retainer 13, through its own rigidity and connection with the secondary rockfill zone 12, restricts the lateral deformation of the dam body 10, while not affecting the control of the main rockfill zone on the vertical settlement of the dam body, thus ensuring the overall shape and structural stability of the dam body 10. This allows for a wider range of strength requirements for the secondary rockfill zone 12, further reducing its area and fill volume. The fill area can be adjusted according to the amount of material, effectively improving material utilization and thus reducing the overall excavation and filling work, thereby improving technical and economic efficiency.

[0024] In some embodiments, the slope accumulator 13 includes a slope accumulator platform 131, a first contact surface 132 is formed between the secondary rockfill area 12 and the slope accumulator 13, and the slope accumulator 13 extends downward from the slope accumulator platform 131 along the first contact surface 132.

[0025] The slope-pressing platform 131 of the slope-pressing body 13 is a relatively flat part of the slope-pressing body 13. The slope-pressing platform 131 increases the weight of the slope-pressing body 13, especially when the dam body 10 is subjected to lateral forces (such as upstream water pressure or horizontal forces generated by earthquakes). The weight of the platform can improve the anti-sliding force of the downstream part of the dam body 10. Just as adding weights to one end of a balance makes the balance more stable, the slope-pressing platform 131 balances the possible sliding tendency of the dam body 10 through its own weight. By extending the slope-pressing body 13 downward from the slope-pressing platform 131 along the first contact surface 132, the slope-pressing body 13 can be made into an inclined state. Thus, the inclined slope-pressing body 13, while ensuring the stability and other performance of the dam body 10, can reduce the requirements for the strength of the secondary rockfill area materials and reduce the filling range of the secondary rockfill area. Because the inclined structure can achieve the required stability effect through reasonable slope design, utilizing its own geometry and mechanical properties, this can reduce engineering costs and improve the economic benefits of the project.

[0026] In some embodiments, the angle of the first contact surface 132 varies from 0 to 60°. When there is a lot of soft rock or waste material, there is more material used for the slope stabilization body 13. At this time, the filling range of the secondary rockfill area 12 can be smaller, thereby preventing the soft rock or waste material from being wasted.

[0027] In some embodiments, the slope ratio of the second contact surface 133 is between 1:0.2 and 1:0.6. By setting such a slope ratio, it can be ensured that the control effect of the main rockfill area on the vertical settlement of the dam body is not affected.

[0028] In some embodiments, the dam foundation 16 is also included, which is disposed at the bottom of the dam body 10, and a drainage body 15 is disposed between the dam foundation 16 and the dam body 10.

[0029] A drainage body 15 is installed between the dam foundation 16 and the dam body 10 to promptly drain seepage water from both the dam body 10 and the dam foundation 16. During water impoundment, water will seep into the dam body 10. If this seepage cannot be drained in time, it will cause the phreatic line to rise. The drainage body 15 can cut off the seepage path and guide the seepage water downstream, thereby effectively lowering the phreatic line of the dam body 10. For example, for some earth-rock dams built on poorly permeable foundations, the drainage body 15 can prevent water accumulation in the dam foundation 16, keeping the phreatic line of the dam body 10 within a safe range and avoiding safety accidents such as landslides caused by an excessively high phreatic line.

[0030] The drainage body 15 also prevents seepage damage to the dam body 10 and dam foundation 16. When seepage pressure exists in the dam body 10 and dam foundation 16, the drainage body 15 can reduce pressure by draining water, preventing soil particles in the dam foundation 16 from being carried away by seepage water (i.e., piping) or soil erosion in the dam body 10 due to excessive seepage pressure. It's like setting up drainage channels around a water-filled sponge to drain water promptly and prevent the sponge from being damaged by excessive water accumulation.

[0031] Furthermore, after the seepage water is drained through the drainage body 15, the water content of the dam body 10 and the dam foundation 16 decreases, and the shear strength of the soil increases. This is highly beneficial to the stability of the dam body 10, especially when resisting external loads such as earthquakes and floods, allowing the dam body 10 to better maintain its stability. For example, under earthquake action, the soil in the dam body 10 and the dam foundation 16, with their lower water content, is less prone to liquefaction, thus reducing the risk of instability of the dam body 10.

[0032] In some embodiments, a filter layer 14 is also provided inside the dam body 10, located between the drainage body 15 and the dam body 10. The filter layer 14 is used to restrict the entry of fine particles into the interior of the dam body 10. The main function of the filter layer 14 is to prevent fine particles inside the dam body 10 from entering the drainage body 15 under seepage. The material of the dam body 10 typically contains particles of various sizes. When seepage occurs, without the filter layer 14, fine particles may be carried into the drainage body 15 by the water flow. The filter layer 14 acts like a fine sieve, allowing water to pass through while intercepting fine particles on one side of the dam body 10. For example, during the operation of an earth-rock dam, silty soil particles in the dam body 10 may be eroded by seepage. The filter layer 14 can effectively prevent the loss of these fine particles, thereby maintaining the original structure and composition of the dam body 10 material. If fine particles from the dam body 10 enter the drainage body 15, it will cause blockage of the drainage body 15. If the drainage body 15 becomes clogged, its drainage function will be greatly reduced, and it will be unable to effectively drain seepage water from the dam body 10 and dam foundation 16, causing the phreatic line to rise. The filter layer 14 ensures the unobstructed flow of the drainage body 15, allowing it to continue its drainage function. Just as a filter screen is installed at the opening of a drainage pipe to prevent debris from entering and causing blockage, the filter layer 14 ensures the normal operation of the drainage body 15, thereby maintaining the seepage stability of the dam body 10.

[0033] In some embodiments, the filter layer 14 is provided with multiple layers, which are arranged sequentially from top to bottom, and the particles of the multiple filter layers 14 gradually increase in size from top to bottom.

[0034] The multi-layered filter layer 14, with progressively larger particles, forms a sophisticated filtration system. The uppermost filter layer 14, with its finer particles, intercepts very small particles in the seepage water from the dam body 10, preventing them from entering the next layer. As seepage continues, the next filter layer 14, with slightly coarser particles, further intercepts relatively larger particles. For example, much like using multiple sieves with different pore sizes to screen materials, this multi-layered structure more effectively filters particles of various sizes, significantly improving the interception capacity for fine particles seeping from the dam body 10.

[0035] In some embodiments, a pad material is provided between the filter layer 14 and the filter layer 14.

[0036] Setting a bedding material between the filter layers 14 effectively prevents relative displacement between them. During operation, the multi-layered filter layers 14 may shift due to seepage erosion and pressure from the dam body 10. The bedding material acts like glue, binding adjacent filter layers 14 together, restricting their relative movement, and ensuring the stability of the filter layer structure. For example, when the dam body 10 is subjected to earthquakes or other external forces, the bedding material prevents misalignment between the filter layers 14, ensuring the normal operation of the filter system.

[0037] Furthermore, the bedding material can buffer the pressure transmission between the filter layers 14. When the load on the upper part of the dam body 10 is transferred to the filter layers 14, the pressure will be distributed between the filter layers 14. The bedding material can make the pressure distribution more uniform, avoiding pressure concentration in a local area of ​​a certain filter layer 14. It's like placing a soft cushion between two hard objects, reducing the direct collision between the hard objects and protecting the filter layers 14 from damage by excessive pressure.

[0038] It should be noted that the earth-rock dam partition structure 100 provided in this embodiment of the present invention only shows the part related to the technical problem to be solved by this embodiment of the present invention. It can be understood that the earth-rock dam partition structure 100 provided in this embodiment of the present invention also includes other structures for realizing the function of the earth-rock dam partition structure 100, which will not be described in detail again.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above. For the sake of brevity, they are not provided in detail; although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A zoned earth-rock dam structure considering the downstream slope effect, applied to a riverbed, characterized in that, include: The dam body includes a main rockfill area, a secondary rockfill area, and a slope protection structure. Along the riverbed from upstream to downstream, the main rockfill area, the secondary rockfill area, and the slope protection body are arranged sequentially. The secondary rockfill area and the slope protection body are adjustable structures. The slope protection body can prevent the dam body from sliding or reduce downstream deformation, thereby reducing the amount of filling in the secondary rockfill area.

2. The earth-rock dam zoning structure considering downstream slope action according to claim 1, characterized in that, The slope stabilizing body includes a slope stabilizing platform, and a first contact surface is formed between the secondary rockfill area and the slope stabilizing body. The slope stabilizing body extends downward from the slope stabilizing platform along the first contact surface.

3. The earth-rock dam zoning structure considering downstream slope action according to claim 2, characterized in that, The slope of the secondary rockfill area and the first contact surface is 0-60°.

4. The earth-rock dam zoning structure considering downstream slope action according to claim 3, characterized in that, A second contact surface is formed between the secondary rockfill area and the main rockfill area. The slope ratio of the second contact surface is between 1:0.2 and 1:0.6 to ensure that the control effect of the main rockfill area on the vertical settlement of the dam body is not affected.

5. The earth-rock dam partitioned structure considering the downstream slope action according to claim 1, characterized in that, It also includes a dam foundation, which is located at the bottom of the dam body, and a drainage system is provided between the dam foundation and the dam body.

6. The earth-rock dam partitioned structure considering the downstream slope action according to claim 5, characterized in that, A filter layer is also provided between the drainage body and the dam body, and between the drainage body and the dam foundation, respectively. The filter layer is used to restrict fine particles from the dam foundation and the dam body from entering the interior of the drainage body.

7. The earth-rock dam partitioned structure considering the downstream slope action according to claim 1, characterized in that, The dam body is also equipped with a seepage-proof panel, a cushion layer, and a transition material, which are sequentially arranged on the upstream side of the main rockfill area.

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