Concrete faced rockfill dam built on inclined foundation surface and damming method of concrete faced rockfill dam

Abstract

The concrete faced rockfill dam comprises a step structure arranged on the inclined foundation surface with the gradient larger than 40%, the step structure comprises a plurality of ditch bottom platforms arranged at intervals from the upstream to the downstream along the inclined foundation surface, bank slope platforms are connected to the two sides of each ditch bottom platform respectively, and the bank slope platforms are arranged on the inclined foundation surface. Dam foot platforms are arranged below the trench bottom platforms, any two vertically adjacent trench bottom platforms are connected through trench bottom slope surfaces, and the dam foot platforms are connected with the adjacent trench bottom platforms above the dam foot platforms through trench bottom slope surfaces. Any two adjacent bank slope platforms in the vertical direction are connected through a bank slope slope face. Rockfill materials are arranged in the drainage area, the modulus increasing area, the secondary rockfill area and the main rockfill area, the drainage area is arranged on the step structure, the modulus increasing area and the main rockfill area are sequentially arranged from downstream to upstream along the drainage area, and the secondary rockfill area is adjacent to the main rockfill area.

Description

Technical Field

[0001] This invention relates to the field of rockfill dam construction technology for water conservancy and hydropower, specifically to a rockfill dam with a face panel constructed on an inclined foundation and its construction method. Background Technology

[0002] Because the upper reservoir of a pumped-storage power station is typically located on a sloping hillside, the face-supported rockfill dam for the upper reservoir usually needs to be constructed on an inclined foundation surface. However, during actual construction, the steep slope of the foundation surface severely affects the stress direction of the dam body, causing the component of the dam body's self-weight to slide downwards along the foundation surface, thus compromising the overall anti-sliding stability of the rockfill dam. Especially in recent years, the height of rockfill dams has gradually increased from the 100-meter level to the 200-meter or even 300-meter level. The steep slope of the foundation surface further induces uneven settlement and creep effects in the dam body. When uneven settlement occurs along the inclined direction, additional stress is generated, which may lead to problems such as face cracking and joint failure, thus affecting the seepage prevention performance of the rockfill dam. Furthermore, the creep effect accumulates over time, causing slow deformation under long-term loads, further increasing the possibility of structural instability in the rockfill dam. Summary of the Invention

[0003] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a rockfill dam with a panel built on an inclined foundation surface and a method for constructing the dam, which can avoid the formation of a slope-adhering dam body with a large slope on the inclined foundation surface and improve the stability of the rockfill dam.

[0004] To achieve the above objectives, the present invention provides a rockfill dam with a face panel constructed on an inclined foundation surface, comprising a stepped structure, a drainage zone, a modulus enhancement zone, a secondary rockfill zone, a primary rockfill zone, and a face panel; the stepped structure is disposed on an inclined foundation surface with a slope greater than 40%, and the stepped structure includes multiple bottom platforms, multiple bank slope platforms, a dam toe platform, multiple bottom slope surfaces, and multiple bank slope surfaces. The multiple bottom platforms are spaced apart along the inclined foundation surface from upstream to downstream. Bank slope platforms are connected to both sides of each bottom platform, and the elevation of each bottom platform is the same as the elevation of its adjacent bank slope platforms. The dam toe platform is located below the multiple bottom platforms. Any two adjacent bottom platforms are connected by bottom slope surfaces. The dam toe platform is connected to the adjacent bottom platform above it. The bottom platforms are connected by sloping surfaces at the bottom of the ditch. Any two adjacent bank slope platforms are connected by sloping surfaces at the top and bottom of the ditch. The slope of the ditch bottom slope and the bank slope is set to 5%-15%, and the slope of all ditch bottom slopes and all bank slopes is the same. Rockfill is provided in the drainage area, the modulus enhancement area, the secondary rockfill area, and the main rockfill area. The rockfill in the modulus enhancement area is layered, and the thickness of each layer is 600mm. The drainage area is set on a stepped structure. The modulus enhancement area and the main rockfill area are set sequentially from downstream to upstream along the drainage area. The secondary rockfill area is adjacent to the main rockfill area and is located at the top of the modulus enhancement area. The panel is set on the main rockfill area along the upstream side of the main rockfill area.

[0005] Furthermore, the stepped structure is set on an inclined foundation surface with a slope range of 40%-70%.

[0006] Furthermore, the widths of the plurality of bottom platforms and the plurality of bank slope platforms are all the same.

[0007] Furthermore, the width of the bottom platform is set to h1, where 6m < h1 < 10m, and the width of the bank platform is set to h2, where 3m < h2 < 5m. The bottom platform is provided with connecting transition sections of gradually changing width on both sides, and the bottom platform is connected to the bank platform through the connecting transition sections on both sides.

[0008] Furthermore, the distance between any two adjacent bottom platforms is the same, the distance between any two adjacent bank platforms is the same, and the distance between any two adjacent bottom platforms is the same as the distance between any two adjacent bank platforms, and both are set to 6m-10m.

[0009] Furthermore, the particle size of the riprap in the modulus enhancement zone is less than 600 mm, the content of riprap with a particle size of less than 5 mm in the modulus enhancement zone is less than 20% of the total content of all riprap in the modulus enhancement zone, and the content of riprap with a particle size of less than 0.075 mm in the modulus enhancement zone is less than 5% of the total content of all riprap in the modulus enhancement zone.

[0010] Furthermore, the stepped structure also includes a retaining wall, a drainage pipe, and a measuring weir. The retaining wall is set on the dam toe platform, and the length of the retaining wall extends perpendicular to the width of the dam toe platform. A connecting hole is provided on the retaining wall. One end of the drainage pipe passes through the connecting hole on the retaining wall and is connected to the drainage area, while the other end is connected to the measuring weir.

[0011] Furthermore, the panel is made of materials including cement concrete and asphalt concrete.

[0012] The present invention also discloses a dam construction method using the above-mentioned rockfill dam constructed on an inclined foundation surface, the dam construction method comprising the following steps:

[0013] S1. Construction of stepped structures: If the slope of the entire inclined foundation surface is greater than 40%, multiple trench bottom platforms are excavated sequentially from upstream to downstream along the inclined foundation surface. On both sides of each trench bottom platform, bank slope platforms with the same elevation are excavated. A dam toe platform is excavated on the downstream side of the lowest trench bottom platform. Any two adjacent trench bottom platforms are connected by a trench bottom slope with a slope range of 5%-15%. The dam toe platform is connected to its adjacent upstream trench bottom platform (by a trench bottom slope with a slope range of 5%-15%). Any two adjacent bank slope platforms are connected by a bank slope with a slope range of 5%-15%. If the slope of a part of the inclined foundation surface is less than or equal to 40%, a stepped structure is only constructed on the inclined foundation surface with a slope greater than 40%.

[0014] S2. Filling the drainage area: If the slope of the entire inclined foundation surface is greater than 40%, the drainage area is filled from downstream to upstream along the stepped structure using riprap. If the slope of a part of the inclined foundation surface is less than or equal to 40%, a part of the drainage area is filled from downstream to upstream along the stepped structure, and the other part is filled from downstream to upstream along the inclined foundation surface with a slope of less than or equal to 40%.

[0015] S3. Filling the Modularization Zone, Secondary Rockfill Zone, and Main Rockfill Zone: Along the drainage area, from downstream to upstream, fill the modularization zone and the main rockfill zone sequentially using rockfill material. The rockfill material in the modularization zone is filled in layers, with each layer being 600mm thick. If the slope of the entire inclined foundation surface is greater than 40%, the entire modularization zone is located above the stepped structure. If the slope of a part of the inclined foundation surface is less than or equal to 40%, a part of the modularization zone is located above the stepped structure, and the other part is located above the inclined foundation surface with a slope less than or equal to 40%. After the modularization zone is filled, the secondary rockfill zone and the main rockfill zone are filled sequentially from downstream to upstream using rockfill material.

[0016] S4. Complete the panel: After the main rockfill area is filled, lay the panel on the main rockfill area along the upstream side of the main rockfill area.

[0017] As described above, the rockfill dam with face panel constructed on an inclined foundation surface according to the present invention has the following beneficial effects:

[0018] By setting up a stepped structure and using stepped excavation on the inclined foundation surface with a slope greater than 40%, the sliding force of the rockfill dam along the inclined foundation surface can be effectively reduced, thus improving the stability of the rockfill dam. By setting up a modulus zone at the bottom of the secondary rockfill area, the modulus zone on the downstream slope of the dam can effectively reduce the settlement difference and creep between the upstream and downstream sides of the rockfill dam, reduce the slippage between the rockfill panel and the main rockfill area, and reduce the possibility of cracks appearing in the rockfill dam and the panel. By setting up retaining walls, drainage pipes, and measuring weirs, the seepage water of the rockfill dam can be collected and its flow rate can be effectively monitored, which can play a role in downstream toe protection of the rockfill dam and can also appropriately reduce the trailing length of the rockfill dam. Attached Figure Description

[0019] Figure 1 This is a cross-sectional schematic diagram of the panel rockfill dam in this invention.

[0020] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0021] Figure 3 This is a schematic diagram of the stepped structure in this invention.

[0022] Figure 4 for Figure 3 Enlarged view of point B in the middle.

[0023] Explanation of icon numbers

[0024] 1. Stepped structure; 101. Ditch bottom platform; 102. Bank slope platform; 103. Dam toe platform; 104. Ditch bottom slope; 105. Bank slope; 106. Retaining wall; 107. Drainage pipe; 2. Drainage area; 3. Modulation area; 4. Secondary rockfill area; 5. Main rockfill area; 6. Panel; h1. Width of the ditch bottom platform; h2. Width of the bank slope platform. Detailed Implementation

[0025] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0026] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0029] See Figures 1 to 4This invention provides a rockfill dam with a face panel constructed on an inclined foundation surface, comprising a stepped structure 1, a drainage zone 2, a modulus zone 3, a secondary rockfill zone 4, a main rockfill zone 5, and a face panel 6. The stepped structure 1 is set on an inclined foundation surface with a slope greater than 40%, and includes multiple bottom platforms 101, multiple bank slope platforms 102, a dam toe platform 103, multiple bottom slope surfaces 104, and multiple bank slope surfaces 105. The multiple bottom platforms 101 are spaced apart along the inclined foundation surface from upstream to downstream. Specifically, the multiple bottom platforms 101 have different... The ditch bottom platforms 101 are arranged in a stepped manner from upstream to downstream, with slope platforms 102 connected to both sides of each platform 101. The elevation of each platform 101 is the same as that of its adjacent slope platforms 102. Specifically, the slope platforms 102 located on both sides of the ditch bottom platforms 101 are spaced apart from upstream to downstream along the inclined foundation surface. The dam toe platform 103 is located below the ditch bottom platforms 101. Specifically, the dam toe platform 103 is located at the downstream toe of the rockfill dam. Any two adjacent platforms are connected at the same elevation. All the bottom platforms 2 are connected by bottom slopes 104. The toe platform 103 is connected to its adjacent bottom platform 2 via bottom slopes 104. Any two adjacent bank slope platforms 102 are connected via bank slopes 105. The slopes of the bottom slopes 104 and bank slopes 105 are all set between 5% and 15%, and all bottom slopes 104 and bank slopes 105 have the same slope. (This is part of the drainage zone 2, the modulus enhancement zone 3, the secondary rockfill zone 4, and the main rockfill zone 5.) All sections are equipped with riprap. The riprap in the modulus enhancement zone 3 is layered, with each layer having a thickness of 600mm. The drainage zone 2 is located on the stepped structure 1. The modulus enhancement zone 3 and the main riprap zone 5 are arranged sequentially from downstream to upstream along the drainage zone 2. The secondary riprap zone 4 is adjacent to the main riprap zone 5 and is located at the top of the modulus enhancement zone 3. The panel 6 is arranged on the main riprap zone 5 along the upstream side of the main riprap zone 5. Preferably, the design parameters of the dam material, number of compaction passes, filling control standards, deformation modulus, etc. in the modulus enhancement zone 3 are the same as those in the main riprap zone 5.

[0030] The basic working principle of the rockfill dam with face panels constructed on an inclined foundation surface, as disclosed in this invention, is as follows: By setting the face panels 6, leakage of reservoir water can be prevented, ensuring the water storage function of the rockfill dam; by setting the stepped structure 1, the dam foundation topography of the rockfill dam with face panels is modified. Specifically, by constructing the bottom platform 101, the bank slope platform 102, the dam toe platform 103, the bottom slope surface 104, and the bank slope surface 105, the slope of the inclined foundation surface in the vertical and parallel dam axis directions is made as gentle as possible, increasing the yield of the rockfill dam with face panels. The contact area between the slope-adhering dam body and the inclined foundation surface of the rockfill dam changes the force direction of the slope-adhering dam body, thereby improving the anti-sliding performance and stability of the rockfill dam. By setting up the modulus zone 3, the rockfill material in the modulus zone 3 has better compaction and deformation performance, so that the deformation of the main rockfill zone 4 and the modulus zone 3 are coordinated, effectively reducing the settlement difference and creep between the upstream and downstream of the rockfill dam, and reducing the slippage between the panel 6 and the main rockfill zone 5, thus reducing the possibility of cracks in the rockfill dam and cracking of the panel 6.

[0031] See Figures 1 to 4 The present invention will be further described below with reference to a specific embodiment:

[0032] In this embodiment, see Figure 1 , Figure 2 As a preferred design, the stepped structure 1 is set on an inclined foundation surface with a slope range of 40%-70%.

[0033] In this embodiment, see Figure 2 , Figure 3 As a preferred design, the widths of the multiple bottom platforms 101 and the multiple bank platforms 102 are all the same, which allows the bottom platforms 101 and bank platforms 102 to be constructed according to a unified standard, thereby improving construction efficiency.

[0034] In this embodiment, see Figure 2 , Figure 3 As a preferred design, the width of the bottom platform 101 is set to h1, where 6m < h1 < 10m, and the width of the bank platform 102 is set to h2, where 3m < h2 < 5m. The wider bottom platform 101 can improve its load-bearing capacity and reduce the possibility of deformation or damage to the bottom platform 101. The narrower bank platform 102 can reduce its self-weight and additional load, and can more stably bear the lateral force transmitted by the bank slope, thereby improving the overall structure's resistance to instability. The bottom platform 101 is provided with a gradually changing width connecting transition section on both sides, and the bottom platform 101 is connected to the bank platform 102 through the connecting transition sections on both sides. The connecting transition sections facilitate the connection between the bottom platform 101 and the bank platform 102.

[0035] In this embodiment, see Figure 1 , Figure 2 As a preferred design, the distance between any two adjacent bottom platforms 101 is the same, the distance between any two adjacent bank platforms 102 is the same, and the distance between any two adjacent bottom platforms 101 and the distance between any two adjacent bank platforms 102 are both set to 6m-10m. That is, the height of all bottom slope surfaces 104 is the same, the height of all bank slope surfaces 105 is the same, and the height of bottom slope surfaces 104 and bank slope surfaces 105 is the same, both set to 6m-10m. By setting the bottom slope surfaces 104 and bank slope surfaces 105 to the same height, on the one hand, when they bear weight, the load will be evenly distributed to each bottom platform 101 and bank slope platform 102. On the other hand, their self-weight is more uniform, so that the reaction force between the step structure 1 as a whole and the foundation is balanced, reducing the uneven settlement caused by the excessive local self-weight of the step structure 1, and improving the structural stability.

[0036] In this embodiment, see Figure 1 As a preferred design, the particle size of the riprap in the modulus-enhancing zone 3 is less than 600mm, the content of riprap with a particle size less than 5mm in the modulus-enhancing zone 3 is less than 20% of the total riprap content in the modulus-enhancing zone 3, and the content of riprap with a particle size less than 0.075mm in the modulus-enhancing zone 3 is less than 5% of the total riprap content in the modulus-enhancing zone 3. This results in better compaction and deformation performance of the riprap in the modulus-enhancing zone 3, significantly reducing the compressive deformation of the modulus-enhancing zone 3, thereby reducing the total settlement of the rockfill dam and improving the overall performance. For structural stability, preferably, the porosity of the riprap in the modulus-enhancing zone 3 is less than 19%. This ensures good permeability, allowing for rapid drainage of seepage water from the rockfill dam, reducing pore water pressure, and preventing structural instability due to water accumulation. Furthermore, it provides sufficient compression space to better adapt to uneven settlement and absorb some energy through pore compression, thus improving the project's seismic resistance. The dry density of the riprap in the modulus-enhancing zone 3 is greater than 2.17 g / cm³. 3 By setting a higher dry density, the riprap in the modulus zone 3 is arranged more compactly, increasing the friction and interlocking force between particles, enabling it to withstand greater upper loads and reducing deformation and settlement; the permeability coefficient of the riprap in the modulus zone 3 is set to K, where K≥1×10 -1 cm / s, ensuring that the modulus zone 3 can both resist the impact of water flow and drain accumulated water in a timely manner.

[0037] In this embodiment, see Figure 3 , Figure 4As a preferred design, the stepped structure 1 also includes a retaining wall 106, a drainage pipe 107, and a measuring weir. The retaining wall 106 is set on the dam toe platform 103, and the length extension direction of the retaining wall 106 is perpendicular to the width direction of the dam toe platform 103. A connection hole is opened on the retaining wall 106. One end of the drainage pipe 107 passes through the connection hole on the retaining wall 106 and is connected to the drainage area 2, and the other end is connected to the measuring weir. By setting up the retaining wall 106, its own thrust resistance can share the horizontal thrust borne by the rockfill dam, which can appropriately reduce the trailing length of the rockfill dam to a certain extent. By setting up the drainage pipe 107, the seepage water in the drainage area 2 can be discharged to the measuring weir in a timely manner. The measuring weir can collect the seepage water of the rockfill dam and effectively monitor its flow rate, which plays a downstream protection role for the rockfill dam. That is, it guides the downstream water flow to flow smoothly, reduces the generation of eddies and turbulence, thereby reducing the local scour intensity and indirectly protecting the engineering structure. Preferably, the diameter of the drainage pipe 107 is set to 0.6m-1m.

[0038] In this embodiment, see Figure 1 As a preferred design, panel 6 is made of cement concrete and asphalt concrete, which have good durability, long service life and good seepage prevention effect.

[0039] See Figures 1 to 4 The present invention also discloses a dam construction method using the aforementioned rockfill dam constructed on an inclined foundation surface. The dam construction method includes the following steps:

[0040] S1. Construction of Stepped Structure 1: If the slope of the entire inclined foundation surface is greater than 40%, multiple bottom platforms 101 are excavated sequentially from upstream to downstream along the inclined foundation surface. These platforms have different elevations and are arranged in a stepped manner from upstream to downstream. On both sides of each bottom platform 101, bank slope platforms 102 with the same elevation are excavated. All bottom platforms 101 have the same width, ranging from 6m to 10m, and all bank slope platforms 102 have the same width, ranging from 3m to 5m. Gradually changing transition sections are provided on both sides of each bottom platform 101, connecting it to the bank slope platforms 102. A dam toe is excavated on the downstream side of the lowest bottom platform 101. Platform 103 connects any two adjacent bottom platforms 101 of the ditch through a ditch bottom slope 104 with a slope range of 5%-15%. Platform 103 at the dam toe connects to its adjacent upstream bottom platform 101 through a ditch bottom slope 104 with a slope range of 5%-15%. Platform 102 connects any two adjacent bank slope platforms 102 through a bank slope 105 with a slope range of 5%-15%. All bottom slopes 104 and all bank slopes 105 have the same height. The height of bottom slopes 104 and bank slopes 105 is the same and is set to 6m-10m. If the slope of a part of the inclined foundation surface is less than or equal to 40%, then the stepped structure 1 is only constructed on the inclined foundation surface with a slope greater than 40%.

[0041] S2. Filling drainage area 2: If the slope of the entire inclined foundation surface is greater than 40%, then the drainage area 2 is filled from downstream to upstream along the stepped structure 1 by piling up riprap; if the slope of a part of the inclined foundation surface is less than or equal to 40%, then a part of the drainage area 2 is filled from downstream to upstream along the stepped structure 1, and the other part is filled from downstream to upstream along the inclined foundation surface with a slope of less than or equal to 40%. A retaining wall 106 is set on the dam toe platform 103. A connecting hole is opened on the retaining wall 106. One end of the drainage pipe 107 passes through the connecting hole on the retaining wall 106 and is connected to the drainage area 2, and the other end is connected to the measuring weir.

[0042] S3. Filling and Increasing Zone 3, Secondary Rockfill Zone 4, and Main Rockfill Zone 5: Along the drainage zone 2, from downstream to upstream, fill the increasing zone 3 and main rockfill zone 5 sequentially with rockfill material. The rockfill material in increasing zone 3 is layered, with each layer being 600mm thick. The particle size of the rockfill material in increasing zone 3 is less than 600mm. The content of rockfill material with a particle size less than 5mm in increasing zone 3 is less than 20% of the total rockfill material content in increasing zone 3. The content of rockfill material with a particle size less than 0.075mm in increasing zone 3 is less than 5% of the total rockfill material content in increasing zone 3. The porosity of the rockfill material in increasing zone 3 is less than 19%. The dry density of the rockfill material in increasing zone 3 is greater than 2.17g / cm³. 3 The permeability coefficient of the riprap in the modulus zone 3 is set to K, where K ≥ 1 × 10⁻⁶. - 1 cm / s, and the design parameters of the dam material, number of compaction passes, filling control standards, deformation modulus, etc. in the modulus-enhancing zone 3 are the same as those in the main rockfill zone 5. If the slope of the inclined foundation surface is all greater than 40%, then the entire modulus-enhancing zone 3 is located above the step structure 1. If the slope of a part of the inclined foundation surface is less than or equal to 40%, then a part of the modulus-enhancing zone 3 is located above the step structure 1, and the other part is located above the inclined foundation surface with a slope of less than or equal to 40%. After the modulus-enhancing zone 3 is filled, the secondary rockfill zone 4 and the main rockfill zone 5 are filled sequentially from downstream to upstream using rockfill material.

[0043] S4. Complete Panel 6: After the main rockfill area 5 is filled, lay panel 6 on the upstream side of the main rockfill area 5. Specifically, lay the transition area and the cushion layer area from bottom to top along the upstream side of the main rockfill area 5. After the pre-settlement is completed during the construction period of the rockfill dam, lay panel 6.

[0044] As described above, the method for constructing a panel rockfill dam on an inclined foundation surface according to the present invention has the following beneficial effects:

[0045] By setting up a stepped structure 1, the inclined foundation surface with a slope greater than 40% is excavated in a stepped manner, which can effectively reduce the sliding force of the rockfill dam along the inclined foundation surface and improve the stability of the rockfill dam. By setting up a modulus zone 3 at the bottom of the secondary rockfill zone 4, the modulus zone 3 can effectively reduce the settlement difference and creep between the upstream and downstream of the rockfill dam, reduce the misalignment between the rockfill dam panel 6 and the main rockfill zone 5, and reduce the possibility of cracks in the rockfill dam panel and the rockfill dam panel 6. By setting up a retaining wall 106, a drainage pipe 107, and a measuring weir, the seepage water of the rockfill dam panel can be collected and its flow rate can be effectively monitored, which can play a role in downstream protection of the rockfill dam panel and can also appropriately reduce the tail length of the rockfill dam panel.

[0046] In summary, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0047] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A face rockfill dam constructed on an inclined foundation surface, characterized in that: The step structure (1) is arranged on the inclined building base surface with a slope greater than 40%, the step structure (1) comprises a plurality of ditch bottom platforms (101), a plurality of bank slope platforms (102), a dam foot platform (103), a plurality of ditch bottom slope surfaces (104) and a plurality of bank slope slope surfaces (105), the plurality of ditch bottom platforms (101) are arranged at intervals from upstream to downstream along the inclined building base surface, the two sides of the ditch bottom platform (101) are connected with the bank slope platforms (102) respectively, the elevation of the ditch bottom platform (101) is the same as the elevations of the bank slope platforms (102) on the two sides thereof, the dam foot platform (103) is located below the plurality of ditch bottom platforms (101), the two adjacent ditch bottom platforms (2) are connected through the ditch bottom slope surface (104), the dam foot platform (103) and the adjacent ditch bottom platform (2) above the dam foot platform (103) are connected through the ditch bottom slope surface (104), the two adjacent bank slope platforms (102) are connected through the bank slope slope surface (105), the slope ranges of the ditch bottom slope surface (104) and the bank slope slope surface (105) are both set to 5%-15%, and the slopes of all the ditch bottom slope surfaces (104) and the slopes of all the bank slope slope surfaces (105) are the same, the drainage area (2), the increased mode area (3), the secondary rockfill area (4) and the main rockfill area (5) are all provided with rockfill materials, the rockfill materials in the increased mode area (3) are arranged in layers, and the thickness of each layer is set to 600mm, the drainage area (2) is arranged on the step structure (1), the increased mode area (3) and the main rockfill area (5) are sequentially arranged along the drainage area (2) from downstream to upstream, the secondary rockfill area (4) is arranged adjacent to the main rockfill area (5), and the secondary rockfill area (4) is located on the top of the increased mode area (3), and the panel (6) is arranged on the main rockfill area (5) along the upstream side of the main rockfill area (5).

2. The face rockfill dam constructed on an inclined building base according to claim 1, characterized in that: The step structure (1) is arranged on the inclined building base surface with a slope range of 40%-70%.

3. The face rockfill dam constructed on an inclined building base according to claim 1, characterized in that: The widths of the plurality of ditch bottom platforms (101) are the same, and the widths of the plurality of bank slope platforms (102) are the same.

4. The face rockfill dam constructed on an inclined building base according to claim 3, characterized in that: The width of the ditch bottom platform (101) is set to h1, 6m 5. The panelled rockfill dam constructed on a sloping foundation surface according to claim 1, characterized in that: The distance between any two adjacent ditch bottom platforms (101) is the same, the distance between any two adjacent bank slope platforms (102) is the same, the distance between any two adjacent ditch bottom platforms (101) is the same as the distance between any two adjacent bank slope platforms (102), and both are set to 6m-10m.

6. The panelled rockfill dam constructed on a sloping foundation surface according to claim 1, characterized in that: The particle size of the rockfill in the increased modulus zone (3) is less than 600 mm, the content of the rockfill with a particle size less than 5 mm in the increased modulus zone (3) is less than 20% of the content of all rockfill in the increased modulus zone (3), and the content of the rockfill with a particle size less than 0.075 mm in the increased modulus zone (3) is less than 5% of the content of all rockfill in the increased modulus zone (3).

7. The panelled rockfill dam constructed on a sloping foundation surface according to claim 1, characterized in that: The stepped structure (1) further comprises a retaining wall (106) and a drainage pipe (107), the retaining wall (106) is arranged on the dam foot platform (103), the length extension direction of the retaining wall (106) is perpendicular to the width direction of the dam foot platform (103), the retaining wall (106) is provided with a connecting hole, one end of the drainage pipe (107) penetrates through the connecting hole of the retaining wall (106) and is in communication with the drainage zone (2), and the other end is in communication with the water measuring weir.

8. The panelled rockfill dam constructed on a sloping foundation surface according to claim 1, characterized in that: The material of the panel (6) comprises cement concrete and asphalt concrete.

9. A method of dam construction, characterized by: The dam building method is performed on the panel rockfill dam built on the inclined building base according to any one of the above claims 1-8, and the dam building method comprises the following steps: S1, building the stepped structure (1): if the slope of the entire inclined building base is greater than 40%, a plurality of groove bottom platforms (101) are excavated along the inclined building base from upstream to downstream, and bank slope platforms (102) with the same elevation as the groove bottom platforms (101) are excavated on both sides of each groove bottom platform (101), a dam foot platform (103) is excavated on the downstream side of the lowermost groove bottom platform (101), any two adjacent groove bottom platforms (101) are connected by a groove bottom slope surface (104) with a slope range of 5%-15%, the dam foot platform (103) and the adjacent upstream groove bottom platform (101) are connected by a groove bottom slope surface (104) with a slope range of 5%-15%, and any two adjacent bank slope platforms (102) are connected by a bank slope slope surface (105) with a slope range of 5%-15%; if the slope of part of the inclined building base is less than or equal to 40%, the stepped structure (1) is only built on the inclined building base with a slope greater than 40%; S2, filling the drainage zone (2): if the slope of the entire inclined building base is greater than 40%, the drainage zone (2) is filled with rockfill along the stepped structure (1) from downstream to upstream; if the slope of part of the inclined building base is less than or equal to 40%, part of the drainage zone (2) is filled along the stepped structure (1) from downstream to upstream, and the other part is filled along the inclined building base with a slope less than or equal to 40% from downstream to upstream; S3, filling the increased modulus area (3), the secondary rockfill area (4) and the main rockfill area (5): along the drainage area (2) from downstream to upstream, the increased modulus area (3) and the main rockfill area (5) are filled with rockfill materials in turn, the rockfill materials in the increased modulus area (3) are filled in layers, and the thickness of each layer is 600mm, if the slope of the inclined building base is greater than 40% in total, the increased modulus area (3) is located above the stepped structure (1) in total, if the slope of part of the inclined building base is less than or equal to 40%, part of the increased modulus area (3) is located above the stepped structure (1) and the other part is located above the inclined building base with a slope less than or equal to 40%, after the filling of the increased modulus area (3) is completed, the secondary rockfill area (4) and the main rockfill area (5) are filled with rockfill materials from downstream to upstream in turn; S4, completing the panel (6): after the filling of the main rockfill area (5) is completed, the panel (6) is laid on the main rockfill area (5) along the upstream side of the main rockfill area (5).

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