Dam body partition structure of bituminous concrete face rockfill dam of pumped storage power station in severe cold area for damming by using soft rock materials

Abstract

The utility model provides a dam body partition structure of an asphalt concrete face rockfill dam of a pumped storage power station in a severe cold area. The dam body partition structure comprises an asphalt concrete face, a broken stone hardcore, a transition area, an upstream rockfill I area, a downstream rockfill I area, a downstream rockfill II area, a downstream rockfill III area, a downstream dry stone revetment, a dam foundation transition area and a drainage body. The dam body partition structure of the asphalt concrete face rock-fill dam of the pumped storage power station for damming in the severe cold area is easy to construct, economical, reasonable, safe and effective, reservoir basin excavation materials can be used efficiently, excessive mining of stock yards outside a reservoir is reduced, engineering investment is saved, and ecological environment pollution is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of rockfill dam structures, and particularly relates to a dam body zoning structure of an asphalt concrete faced rockfill dam for a pumped storage power station in a cold region using soft rock materials for dam construction. Background Technique

[0002] As a dam type favored by many existing and under-construction pumped storage projects, asphalt concrete faced rockfill dams often have problems of excavation and filling balance of earth and rock. In some projects, there is a large amount of excavated material in the reservoir area, but due to the poor quality of the excavated material, it does not meet the dam construction requirements specified in the specifications, resulting in a large amount of engineering waste and polluting the local ecological environment. To meet the dam filling requirements, it is necessary to activate backup material yards or even open up new material yards, resulting in an increase in project investment. In some projects, due to the unreasonable dam body zoning, the utilization rate of available materials is low and there is a lot of waste. In some projects, the judgment of the material yard situation in the early stage is too optimistic. As the geological conditions of the material yard become clearer after the start of construction, problems such as tight dam building material sources and insufficient high-quality material sources become increasingly prominent, so that it is necessary to change the material source. Through a large number of excavated material tests and dam body stress and deformation calculation and analysis, the feasibility of using soft rock and tunnel excavated materials as dam materials is studied, and a large amount of exploration and design work is carried out again.

[0003] In terms of engineering practice, for the upper reservoir of Langyashan Pumped Storage Power Station, when the material source was insufficient, tunnel excavated materials with fewer coarse grains and finer particle sizes were used as the upper dam materials; for the rockfill dam of the upper reservoir of Ming Tombs Pumped Storage Power Station, all were filled with reservoir basin excavated materials, and a large amount of weathered rock materials were used in the downstream rockfill area; for the asphalt concrete faced rockfill dam of the upper reservoir of Wendeng Pumped Storage Power Station, fully and strongly weathered materials excavated from the reservoir area were used in the downstream rockfill area.

[0004] At present, there are still the following problems in the dam body filling, reservoir basin excavation, and using soft rock materials for dam construction of asphalt concrete faced rockfill dams: (1) In the case of poor quality, low utilization rate, and a large amount of waste of excavated materials, there is a lack of effective general solutions; (2) During the project construction stage, there is a lack of effective measures and methods for optimizing the design of dam body zoning based on materials; (3) There is no complete set of design technologies for using soft rock excavated materials efficiently, reducing over-exploitation of out-of-reservoir material yards, saving project investment, and reducing ecological environmental pollution. Content of the Utility Model

[0005] Aiming at the defects existing in the prior art, the utility model provides a dam body zoning structure of an asphalt concrete faced rockfill dam for a pumped storage power station in a cold region using soft rock materials for dam construction, which can effectively solve the above problems.

[0006] The technical solution adopted by the utility model is as follows:

[0007] The utility model provides a zoning structure of an asphalt concrete faced rockfill dam for a pumped storage power station in a severe cold area using soft rock materials for dam construction, including: an asphalt concrete face slab (1), a crushed stone cushion layer (2), a transition zone (3), an upstream rockfill zone I (4), a downstream rockfill zone I (5), a downstream rockfill zone II (6), a downstream rockfill zone III (7), a downstream dry rubble slope protection (8), a dam foundation transition zone (9), and a drainage body (10);

[0008] The asphalt concrete face slab (1), the crushed stone cushion layer (2), the transition zone (3), and the upstream rockfill zone I (4) are arranged in sequence from upstream to downstream to form an upstream dam slope;

[0009] The downstream rockfill zone I (5) and the upstream rockfill zone I (4) are arranged relatively with respect to the dam axis and are located on both sides of the dam axis; between the bottoms of the downstream rockfill zone I (5) and the upstream rockfill zone I (4) and the dam foundation, a dam foundation transition zone (9) and a drainage body (10) are provided;

[0010] The downstream rockfill zone II (6) is arranged inside the downstream rockfill zone I (5); the downstream rockfill zone III (7) is arranged inside the downstream rockfill zone II (6); the outer surface of the downstream rockfill zone II (6) forms a downstream side slope, and the downstream dry rubble slope protection (8) is arranged on the outer surface of the downstream rockfill zone II (6).

[0011] Preferably, the crushed stone cushion layer (2) has a horizontal width of 300 cm at the dam slope part, uses graded crushed stone with a maximum particle size of 80 mm, and has a permeability coefficient of not less than 10 -2 cm / s and a deformation modulus of not less than 40 MPa;

[0012] The transition zone (3) has a horizontal width of 300 cm at the dam slope part, uses graded crushed stone with a maximum particle size of 300 mm, and has a permeability coefficient of not less than 10 -2 cm / s;

[0013] The upstream rockfill zone I (4) uses graded stone with a maximum particle size of 600 mm, and has a permeability coefficient of not less than 10 -1 cm / s.

[0014] Preferably, the downstream rockfill zone I (5), the downstream rockfill zone II (6), the downstream rockfill zone III (7), and the downstream dry rubble slope protection (8) form a downstream dam slope;

[0015] The downstream rockfill zone I (5) uses graded stone with a maximum particle size of 600 mm, and has a permeability coefficient of not less than 10 -1 cm / s;

[0016] For the downstream rockfill zone II (6) and the downstream rockfill zone III (7), the mixture of hard and soft rocks excavated from the reservoir basin with a maximum particle size of 600 mm is used and compacted respectively; for the downstream rockfill zone I (5), the downstream rockfill zone II (6) to the downstream rockfill zone III (7), the physical and mechanical properties of the filling materials gradually decrease.

[0017] Preferably, the thickness of the downstream dry rubble slope protection (8) is 0.5 m and block stones are used.

[0018] Preferably, for the dam foundation transition zone (9), the vertical thickness above the dam foundation is 100 cm, graded gravel with a maximum particle size of 300 mm is used, and the permeability coefficient is not less than 10 -2 cm / s.

[0019] Preferably, the drainage body (10) is arranged on the downstream side of the dam axis. The thickness of the drainage body (10) is 2 m, a layer of non-woven fabric is laid on the top, graded stone materials with a maximum particle size of 600 mm are used, and the permeability coefficient is not less than 10 -1 cm / s.

[0020] The dam body zoning structure of the asphalt concrete face rockfill dam for a pumped storage power station in a cold region using soft rock materials for dam construction provided by the present utility model has the following advantages:

[0021] The present utility model provides a dam body zoning structure of an asphalt concrete face rockfill dam for a pumped storage power station in a cold region using soft rock materials for dam construction. This zoning structure is simple in construction, reasonable in economy, safe and effective, can efficiently use the excavated materials from the reservoir basin, reduce the over-exploitation of the external quarry, save project investment, and reduce the ecological environment pollution. Brief Description of the Drawings

[0022] Figure 1 It is a sectional view of the dam body zoning structure of an asphalt concrete face rockfill dam for a pumped storage power station in a cold region using soft rock materials for dam construction provided by the present utility model.

[0023] In the figure:

[0024] 1 - asphalt concrete face; 2 - gravel cushion; 3 - transition zone; 4 - upstream rockfill zone I; 5 - downstream rockfill zone I; 6 - downstream rockfill zone II; 7 - downstream rockfill zone III; 8 - downstream dry rubble slope protection; 9 - dam foundation transition zone; 10 - drainage body. Detailed Embodiment

[0025] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0026] In view of the problems in the prior art that the utilization rate of the excavated materials in the reservoir basin of pumped-storage power stations is low, there is a lot of waste rock, the investment is high, and the ecological environment is polluted due to the poor quality of the excavated materials in the reservoir basin, the utility model provides a dam body zoning structure of an asphalt concrete faced rockfill dam for a pumped-storage power station in cold regions using soft rock materials for dam construction. The zoning structure is simple in construction, reasonable in economy, safe and effective, can efficiently use the excavated materials in the reservoir basin, reduce the over-exploitation of the external quarry, save project investment, and reduce the ecological environment pollution.

[0027] The dam body zoning structure of an asphalt concrete faced rockfill dam for a pumped-storage power station in cold regions using soft rock materials for dam construction provided by the utility model has the following main design features:

[0028] The utility model is a dam body zoning design scheme that slows down the downstream dam slope while ensuring the stability of the upstream asphalt concrete panel anti-seepage system, and sets a soft rock material filling area downstream. By setting a gravel cushion layer 2, a transition zone 3, and an upstream rockfill zone I 4 on the upstream side of the dam, it is ensured that the asphalt concrete panel 1 is arranged on a solid hard rock foundation and can drain smoothly, avoiding panel deformation and damage caused by foundation deformation or poor drainage. By slowing down the downstream dam slope and setting a downstream rockfill zone II 6 and a downstream rockfill zone III 7 as soft rock material filling areas downstream, it is ensured that the excavated soft rock materials in the reservoir basin can be fully utilized. On the one hand, by slowing down the dam slope, the downstream dam slope instability caused by the poor physical and mechanical properties of the downstream filling materials is avoided. On the other hand, by setting a drainage body at the dam foundation, the seepage drainage of the dam foundation can be effectively ensured to be smooth and the stability of the dam body can be ensured.

[0029] As Figure 1 shown, the utility model provides a dam body zoning structure of an asphalt concrete faced rockfill dam for a pumped-storage power station in cold regions using soft rock materials for dam construction, including: an asphalt concrete panel 1, a gravel cushion layer 2, a transition zone 3, an upstream rockfill zone I 4, a downstream rockfill zone I 5, a downstream rockfill zone II 6, a downstream rockfill zone III 7, a downstream dry rubble slope protection 8, a dam foundation transition zone 9, and a drainage body 10;

[0030] The asphalt concrete panel 1, the gravel cushion layer 2, the transition zone 3, and the upstream rockfill zone I 4 are arranged in sequence from upstream to downstream to form an upstream dam slope, ensuring that the asphalt concrete panel 1 is arranged on a solid hard rock foundation and can drain smoothly, avoiding panel deformation and damage caused by foundation deformation or poor drainage;

[0031] Slow down the downstream dam slope, and at the same time, set the downstream rockfill zone II 6 and the downstream rockfill zone III 7 as the filling areas for the mixture of hard and soft rocks at the downstream to ensure that the excavated hard and soft rocks in the reservoir basin can be fully utilized while ensuring the stability of the dam. Specifically, the downstream rockfill zone I 5 and the upstream rockfill zone I 4 are arranged opposite to each other with respect to the dam axis and are located on both sides of the dam axis respectively. Between the bottoms of the downstream rockfill zone I 5 and the upstream rockfill zone I 4 and the dam foundation, a dam foundation transition zone 9 and a drainage body 10 are provided.

[0032] The downstream rockfill zone II 6 is arranged inside the downstream rockfill zone I 5; the downstream rockfill zone III 7 is arranged inside the downstream rockfill zone II 6; the outer surface of the downstream rockfill zone II 6 forms a downstream side slope, and the downstream dry rubble slope protection 8 is arranged on the outer surface of the downstream rockfill zone II 6.

[0033] The specific structural form of each layer is as follows:

[0034] 1. For the gravel cushion layer 2, the horizontal width at the dam slope is 300 cm, and graded gravel with a maximum particle size of 80 mm is used, and the permeability coefficient is not less than 10 -2 cm / s. The deformation modulus of the gravel cushion layer 2 at the dam slope is not less than 40 MPa.

[0035] 2. For the transition zone 3, the horizontal width at the dam slope is 300 cm, and graded gravel with a maximum particle size of 300 mm is used, and the permeability coefficient is not less than 10 -2 cm / s.

[0036] 3. For the upstream rockfill zone I 4, graded stone materials with a maximum particle size of 600 mm are used, and the permeability coefficient is not less than 10 -1 cm / s.

[0037] 4. The downstream rockfill zone I 5, the downstream rockfill zone II 6, the downstream rockfill zone III 7 and the downstream dry rubble slope protection 8 form the downstream dam slope.

[0038] For the downstream rockfill zone I 5, graded stone materials with a maximum particle size of 600 mm are used, and the permeability coefficient is not less than 10 -1 cm / s.

[0039] For the downstream rockfill zone II 6 and the downstream rockfill zone III 7, the mixture of hard and soft rocks excavated from the reservoir basin with a maximum particle size of 600 mm is used respectively and compacted; the degree of compaction is not less than 0.98. From the downstream rockfill zone I 5, the downstream rockfill zone II 6 to the downstream rockfill zone III 7, the physical and mechanical properties of the filling materials gradually decrease.

[0040] Therefore, the physical and mechanical properties of the filling materials gradually decrease from the outer rockfill area to the inner rockfill area, ensuring the coordinated deformation of the dam body while preventing the filling materials in the downstream rockfill zone III from being damaged by frost heaving. The dam body drainage system uses a gravel cushion layer 2 and a drainage body 10 for combined drainage.

[0041] 5. To prevent damage to the dam slope by rainwater and the like, the downstream dam slope is provided with a downstream dry-laid stone revetment 8 with a thickness of 0.5 m, using freshly quarried hard block stones that have been handpicked. The requirements for the masonry stones are that they are hard in texture, not easily weathered, and have good water resistance and frost resistance.

[0042] 6. The dam foundation transition zone 9 has a vertical thickness of 100 cm above the dam foundation and uses graded gravel with a maximum particle size of 300 mm, and the permeability coefficient is not less than 10 -2 cm / s.

[0043] 7. To ensure the smooth drainage of seepage from the dam foundation and the stability of the dam body, a drainage body needs to be set at the dam foundation on the downstream side of the dam axis. The thickness of the drainage body is 2 m, and a layer of non-woven fabric is laid on the top. Graded stones with a maximum particle size of 600 mm are used, and the permeability coefficient is not less than 10 -1 cm / s.

[0044] The utility model can make full use of the soft rock materials excavated from the reservoir basin for dam construction. By providing a dam body zoning design scheme that is simple in construction, reasonable in economy, safe and effective, on the one hand, it can make the best use of the soft rock materials excavated from the reservoir basin as much as possible and reduce the waste slag. On the other hand, it can avoid excessive exploitation of the external rockfill quarry. This can not only save project investment, reduce land acquisition, and reduce the impact of project excavation and waste slag on the ecological environment, but also realize the original intention of building a pumped-storage power station to benefit the local area, contribute green clean energy, and improve the protection of the local ecological environment. It provides a design idea and reference for the dam body zoning design of similar projects and has a reference significance.

[0045] The following takes an asphalt concrete faced rockfill dam of a certain project that has adopted the technical solution of the utility model as an example, and further illustrates it in combination with the attached drawings:

[0046] As Figure 1 shown, the stratum lithology in the excavation range of the upper reservoir area of a certain pumped-storage power station is mainly composed of Neogene basalt and tuffaceous breccia, and tuffaceous breccia is interbedded between basalts of each period. The saturated compressive strength of vesicular basalt is 10.4 - 46.9 MPa, with an average value of 28.8 MPa, belonging to relatively soft rock. The saturated compressive strength of tuffaceous breccia is generally 1 - 3 MPa, belonging to soft rock.

[0047] The power station is located in a severe cold region. For the upper reservoir, an asphalt concrete facing is adopted for the whole reservoir basin seepage prevention scheme. The dam is an asphalt concrete faced rockfill dam with a crest elevation of 1599.00 m, a crest width of 10.0 m, a crest length of 1903.27 m, and a maximum dam height of 73.0 m. The geological conditions of the upper reservoir are complex, and the quality of the soft rock excavation materials in the reservoir is poor. If the research on soft rock dam construction is not carried out and a detailed optimized design scheme for the dam body zoning is not formulated, it will cause problems such as low utilization rate of the reservoir basin excavation materials, a large amount of waste slag, high investment, and ecological environment pollution in the power station.

[0048] In response to the above problems, the main zoning of the asphalt concrete faced rockfill dam body is as follows:

[0049] 1) Upstream of the dam body: Asphalt concrete facing 1, with a thickness of 0.202 m; gravel cushion layer 2, with a horizontal width of 3.0 m; transition zone 3, with a horizontal width of 3.0 m;

[0050] 2) Upstream rockfill zone I 4, downstream rockfill zone I 5, downstream rockfill zone II 6, downstream rockfill zone III 7;

[0051] 3) Downstream of the dam body: Downstream dry rubble slope protection 8, with a thickness of 0.5 m;

[0052] 4) Dam foundation: Dam foundation transition zone 9, with a thickness of 1.0 m; drainage body 10, with a thickness of 2.0 m.

[0053] The main design indexes of each above zoning are as follows:

[0054] ① Gravel cushion layer 2

[0055] The gravel cushion layer 2 is located downstream of the asphalt concrete facing 1 and is made of weakly weathered and slightly fresh rhyolite materials mined from the out-of-reservoir rockfill yard. The maximum particle size is 80 mm, the content of particles smaller than 5 mm is 25% - 35%, and the content of particles smaller than 0.075 mm is not more than 5%. The curvature coefficient should be 1 - 3, and the coefficient of uniformity should be greater than 15. The design compaction index: the porosity should not be more than 19%, the corresponding dry density should not be less than 2.15 g / cm 3 , and the permeability coefficient should not be less than 10 -2 cm / s, and the deformation model of the dam slope part should not be less than 40 MPa.

[0056] ② Transition zone 3

[0057] The materials of the transition zone 3 are weakly weathered and slightly fresh rhyolite materials mined from the out-of-reservoir yard. The maximum particle size is 300 mm, the content of particles smaller than 5 mm is not more than 25%, and the content of particles smaller than 0.075 mm is not more than 5%. The curvature coefficient should be 1 - 3, and the coefficient of uniformity should be greater than 10. The design compaction index: the porosity should not be more than 20%, the corresponding dry density should not be less than 2.12 g / cm 3 , and the permeability coefficient should not be less than 10 -2 cm / s.

[0058] ③ Upstream rockfill zone I-4 and downstream rockfill zone I-5

[0059] The materials for upstream rockfill zone I-4 and downstream rockfill zone I-5 are weakly weathered and slightly fresh rhyolite materials mined from the rockfill yard outside the reservoir. The maximum particle size is 600 mm, the content of particles smaller than 5 mm is not more than 20%, and the content of particles smaller than 0.075 mm is not more than 5%. The curvature coefficient should be 1 - 3, and the coefficient of uniformity should be greater than 10. The designed compaction index: the porosity is not more than 22%, and the corresponding dry density is not less than 2.07 g / cm 3 , and the permeability coefficient is greater than 10 -1 cm / s.

[0060] ④ Downstream rockfill zone II-6

[0061] The materials for downstream rockfill zone II-6 are weakly weathered vesicular basalt and tuffaceous breccia mixtures excavated from inside the reservoir, and their mixing ratio is not less than 7:3. The maximum particle size is controlled not to be greater than 600 mm. The designed compaction index: the degree of compaction is not less than 0.98, and the corresponding dry density is not less than 2.06 g / cm 3 .

[0062] ⑤ Downstream rockfill zone III-7

[0063] The materials for downstream rockfill zone III-7 are weakly weathered vesicular basalt and tuffaceous breccia mixtures excavated from inside the reservoir, and their mixing ratio is not less than 4:6. The maximum particle size is controlled not to be greater than 600 mm. The designed compaction index: the degree of compaction is not less than 0.98.

[0064] ⑥ Downstream dry rubble slope protection 8

[0065] To prevent the damage to the dam slope by rainwater, etc., a slope protection is set on the downstream dam slope with a thickness of 50 cm, and fresh and hard block stones picked manually from the rockfill yard outside the reservoir are used. The requirements for the rubble materials are that they are hard in texture, not easy to weather, have good water resistance and frost resistance. The stones have no weathered peeling layer or cracks, and the surface of the stones has no impurities such as dirt and water rust. For the stones used on the surface, the color should be uniform.

[0066] ⑦ Drainage body 10

[0067] The thickness of the drainage body 10 is 2 m. A layer of non-woven fabric is laid on the top of the drainage body 10, and weakly weathered and slightly fresh rhyolite materials mined from the rockfill yard outside the reservoir are used. The maximum particle size is 600 mm, the content of particles smaller than 5 mm is not more than 20%, and the content of particles smaller than 0.075 mm is not more than 5%. The curvature coefficient should be 1 - 3, and the coefficient of uniformity should be greater than 10. The designed compaction index: the porosity is not more than 22%, and the corresponding dry density is not less than 2.07 g / cm 3 , and the permeability coefficient is greater than 10 -1 cm / s.

[0068] The utility model can make full use of the soft rock materials excavated from the reservoir basin to build the dam. By providing a dam body zoning design scheme with simple construction, reasonable economy, safety and effectiveness, on the one hand, it can make the best use of the soft rock materials excavated from the reservoir basin as much as possible and reduce the waste slag. On the other hand, it can avoid excessive exploitation of the external rockfill yard of the reservoir. This can not only save the project investment, reduce land acquisition, and reduce the impact of project excavation and waste slag on the ecological environment, but also realize the original intention of building a pumped-storage power station to benefit the local area, contribute green clean energy, and improve the protection of the local ecological environment. It provides a design idea and reference for the dam body zoning design of similar projects and has a reference significance.

[0069] The above-mentioned embodiments are only used to illustrate the technical idea and characteristics of the utility model, and the purpose is to enable those skilled in the art to understand the content of the utility model and be able to implement it without creative work. The patent scope of the utility model cannot be limited only by this embodiment, that is, any equivalent changes or modifications made according to the spirit disclosed by the utility model still fall within the patent scope of the utility model.

Claims

1. A dam body partition structure of an asphalt concrete face rockfill dam of a pumped storage power station in a severe cold region using soft rock materials for dam construction, characterized in that: include: Asphalt concrete panel (1), crushed stone cushion (2), transition zone (3), upstream rockfill zone I (4), downstream rockfill zone I (5), downstream rockfill zone II (6), downstream rockfill zone III (7), downstream dry stone slope protection (8), dam foundation transition zone (9) and drainage body (10); The asphalt concrete panel (1), the crushed stone cushion layer (2), the transition zone (3) and the upstream rockfill zone I (4) are arranged in sequence from upstream to downstream to form an upstream dam slope; The downstream rockfill area I (5) and the upstream rockfill area I (4) are arranged opposite to each other with respect to the dam axis, and are respectively located on both sides of the dam axis; a dam foundation transition area (9) and a drainage body (10) are arranged between the bottom of the downstream rockfill area I (5) and the upstream rockfill area I (4) and the dam foundation; The downstream rockfill zone II (6) is arranged inside the downstream rockfill zone I (5); the downstream rockfill zone III (7) is arranged inside the downstream rockfill zone II (6); the outer surface of the downstream rockfill zone II (6) forms a downstream side slope, and the downstream dry stone slope protection (8) is arranged on the outer surface of the downstream rockfill zone II (6).

2. According to claim 1, a partition structure of the asphalt concrete face rockfill dam of a pumped storage power station in a severe cold region using soft rock materials for dam construction, characterized in that: The crushed stone cushion layer (2) has a horizontal width of 300 cm at the dam slope, and uses graded crushed stone with a maximum particle size of 80 mm and a permeability coefficient of not less than 10 -2 cm / s, deformation modulus not less than 40MPa; The transition zone (3) has a horizontal width of 300 cm at the dam slope, and is made of graded crushed stone with a maximum particle size of 300 mm and a permeability coefficient of not less than 10 -2 cm / s; The upstream rockfill zone I (4) is made of graded stone with a maximum particle size of 600 mm and a permeability coefficient of not less than 10 -1 cm / s.

3. The partition structure of the asphalt concrete face rockfill dam of a pumped storage power station in cold regions using soft rock materials as claimed in claim 1 is characterized in that: The downstream rockfill area I (5), the downstream rockfill area II (6), the downstream rockfill area III (7) and the downstream dry stone slope protection (8) form a downstream dam slope; The downstream rockfill zone I (5) is made of graded stone with a maximum particle size of 600 mm and a permeability coefficient of not less than 10 -1 cm / s; The downstream rockfill area II (6) and the downstream rockfill area III (7) respectively use a reservoir basin with a maximum particle size of 600 mm to excavate and compact soft and hard rock mixtures; the physical and mechanical properties of the filling materials from the downstream rockfill area I (5), the downstream rockfill area II (6) to the downstream rockfill area III (7) gradually decrease.

4. The partition structure of the asphalt concrete face rockfill dam of a pumped storage power station in a severe cold region using soft rock materials for dam construction according to claim 1 is characterized in that: The thickness of the downstream dry stone slope protection (8) is 0.5m, and block stones are used.

5. The partition structure of the asphalt concrete face rockfill dam of a pumped storage power station in a severe cold region using soft rock materials for dam construction according to claim 1 is characterized in that: The dam foundation transition zone (9) has a vertical thickness of 100 cm above the dam foundation and is made of graded crushed stone with a maximum particle size of 300 mm and a permeability coefficient of not less than 10 -2 cm / s.

6. The partition structure of the asphalt concrete face rockfill dam of a pumped storage power station in cold regions using soft rock materials as claimed in claim 1, characterized in that: The drainage body (10) is arranged on the downstream side of the dam axis. The thickness of the drainage body (10) is 2m, a layer of non-woven fabric is laid on the top, and graded stone with a maximum particle size of 600mm is used. The permeability coefficient is not less than 10 - 1 cm / s.

Images