Geomembrane loess rock-fill dam body partition structure

Abstract

The utility model provides a geomembrane loess rock-fill dam body partition structure which is characterized in that the geomembrane loess rock-fill dam body partition structure comprises a dam foundation and a dam body, the dam foundation is loess, the dam body comprises an upstream rock-fill area and a downstream loess area, and the boundary of the upstream rock-fill area and the downstream loess area tends to the downstream side. Transition structures are arranged among the upstream rockfill area, the downstream loess area and the dam foundation loess, drainage bodies are uniformly distributed in the circumferential direction of the dam body, a composite geomembrane is arranged on the upstream dam surface of the upstream rockfill area, and a lattice beam and a grass planting protection slope are arranged on the downstream slope surface of the downstream loess area. On the basis of meeting stability and seepage prevention of the dam body, the rockfill materials and the loess materials are combined, reservoir basin excavation materials can be fully utilized according to local conditions, meanwhile, the requirement of a geomembrane lower supporting structure and combined application of the loess materials and the rock blocks are considered, the rock blocks and the loess materials excavated in a stock ground can be reasonably utilized to fill the dam body in the dam filling process, and therefore the dam body filling efficiency is improved. Digging and filling balance is achieved, and waste slag is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of rockfill dam construction, and in particular relates to a dam body partition structure of a geomembrane loess rockfill dam. Background Art

[0002] Earth-rock dams have a long history and are currently the most widely used and fastest-growing type of dam in hydropower engineering construction. Earth-rock dams can be divided into rockfill dams with blasted stones, rocks and pebbles as the main dam materials and homogeneous earth dams with uniform clay as the main dam materials according to the dam body materials. Rockfill dams have the characteristics of local dam materials, convenient and fast construction, and strong adaptability to complex foundation conditions; homogeneous earth dams have the characteristics of simple structure, convenient and economical construction, etc.

[0003] In recent years, a number of pumped storage power station projects have been launched in the Yellow River Jiziwan area. For the pumped storage power stations in this area, the landform units in the project area are mostly loess ridges and hills, and loess gullies are scattered throughout the project area. The reservoir site is mostly controlled by loess drape structure, and the loess thickness is relatively large. The excavation foundation of the reservoir basin is mostly collapsible loess. If all of it is excavated, the engineering workload will be large, so it should be considered to build a dam on the loess foundation. For dam construction under loess foundation conditions, earth-rock dams have better adaptability.

[0004] When the natural storage capacity of the pumped storage power station reservoir cannot meet the requirements, consider using excavation to increase part of the storage capacity, and the excavated materials should be used as filling materials for earth-rock dams as much as possible to achieve a balance between excavation and filling. This can not only meet the storage capacity requirements, but also save investment, and reduce waste, which is beneficial to environmental protection. Therefore, the construction of earth-rock dams under loess conditions needs to meet the above requirements and make full use of loess and block stones. How to combine rockfill materials with loess materials to build dams and meet the requirements of dam body anti-seepage and stability is a key issue that needs attention. Utility Model Content

[0005] The utility model aims to provide a geomembrane loess rockfill dam body partition structure to overcome the above-mentioned technical problems existing in the prior art.

[0006] To this end, the technical solution provided by the utility model is as follows:

[0007] A geomembrane loess rockfill dam body partition structure comprises a dam foundation and a dam body, wherein the dam foundation is loess, and the dam body comprises an upstream rockfill area and a downstream loess area, wherein a boundary line between the upstream rockfill area and the downstream loess area inclines to the downstream side, and transition structures are arranged between the upstream rockfill area and the downstream loess area and the loess of the dam foundation, and drainage bodies are uniformly distributed around the dam body, a composite geomembrane is arranged on the upstream dam surface of the upstream rockfill area, and a lattice beam and grass-planted slope protection are arranged on the downstream slope surface of the downstream loess area.

[0008] A gray soil layer is provided between the downstream loess area and the transition structure, and a gray soil layer is provided between the dam foundation loess and the transition structure.

[0009] A transition zone with a thickness of 40 cm to 120 cm is arranged between the drainage body and the upstream rockfill area, and a transition structure with a thickness of 40 cm to 120 cm is adopted between the drainage body and the downstream loess area and the loess of the dam foundation.

[0010] The upstream dam surface of the upstream rockfill area is composed of a transition zone with a horizontal width of 3.0m to 4.0m, a drainage zone, a second transition zone and a composite geomembrane from the inside to the outside.

[0011] The slope ratio of the boundary line between the upstream rockfill area and the downstream loess area is 1:0.3~1:1.

[0012] The transition structure between the upstream rockfill area and the downstream loess area includes a transition area, a second transition area and a first transition area arranged in sequence from downstream to upstream;

[0013] The transition structure between the upstream rockfill area and the dam foundation loess area includes a transition area, a second transition area and a first transition area which are arranged in sequence from top to bottom.

[0014] The drainage bodies are spaced 200-400 m apart, are 3-5 m thick, and 5-10 m wide. The drainage bodies are inclined toward the downstream direction, and a slope ratio of 1:1.0-1:2.0 is provided.

[0015] The transition structure between the drainage body and the loess in the downstream loess area includes a second transition zone and a first transition zone arranged from bottom to top.

[0016] The beneficial effects of the utility model are:

[0017] The geomembrane loess rockfill dam provided by the utility model has a dam body partition structure, the downstream slope of the dam body adopts frame beams and grass-planted slope protection, and the upstream bank slope of the dam body adopts a composite geomembrane anti-seepage type. On the basis of meeting the stability and anti-seepage of the dam body, the rockfill material and the loess material are combined, and the excavated material of the reservoir basin can be fully utilized according to local conditions. At the same time, considering the requirements of the supporting structure under the geomembrane, the combined use of loess material and block stone material, the block stone and loess material excavated from the material field can be reasonably used in the dam filling to achieve excavation and filling balance and reduce waste residue; it has the characteristics of convenient construction, simple structure, economic rationality, safety and effectiveness, etc., and can effectively solve the problem of building earth-rock dams of pumped storage power stations under loess strata conditions, and can be promoted in pumped storage projects in the northwest region. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of an implementation method of the utility model;

[0019] Figure 2 yes Figure 1 A partial enlarged view of the middle part;

[0020] Figure 3 yes Figure 1 A partial enlarged view of point B in the middle;

[0021] Figure 4 is Figure 1 A partial enlarged view of point C in the middle;

[0022] Fig. 5 is a cross-sectional view of the dam body drainage body;

[0023] Figure 6 yes Figure 5 A partial enlarged view of point D in the middle;

[0024] Figure 7 yes Figure 5 A partial enlarged view of point E in the middle.

[0025] In the figure: 1. Rockfill area; 2. Loess area; 3. Dam foundation loess; 4. Composite geomembrane; 5. Frame beam and grass slope protection; 6. Drainage area; 7. Drainage body; 8. Transition zone; 9. Transition zone 1; 10. Transition zone 2; 11. Gray soil layer. DETAILED DESCRIPTION

[0026] The following is an explanation of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0027] The exemplary embodiments of the present invention are now introduced with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0028] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0029] Example 1

[0030] This embodiment provides a geomembrane loess rockfill dam body partition structure, such as Figure 1As shown, it includes a dam foundation and a dam body, the dam foundation is loess, the dam body includes an upstream rockfill area 1 and a downstream loess area 2, the boundary line between the upstream rockfill area 1 and the downstream loess area 2 is inclined to the downstream side, and transition structures are provided between the upstream rockfill area 1 and the downstream loess area 2 and the dam foundation loess 3. Drainage bodies 7 are evenly distributed around the dam body, a composite geomembrane 4 is provided on the upstream dam surface of the upstream rockfill area 1, and a lattice beam and grass slope protection 5 are provided on the downstream slope surface of the downstream loess area 2.

[0031] The utility model sets a rockfill area 1 at the upstream of the dam body, and sets a downstream loess area 2 at the downstream side of the upstream rockfill area 1. Through the zoning of the dam body, in terms of material sources, the excavated material sources of the buildings in the engineering area and the available material sources in the near-dam area are fully utilized, the utilization rate of the rockfill materials and loess materials is improved, and the transfer and disposal of slag materials are reduced; in terms of dam body construction, the upstream rockfill materials and the downstream loess materials can be directly put on the dam for filling, which improves the direct dam rate of each excavated available material during the filling period and facilitates construction; at the same time, in terms of dam body stability, the upstream rockfill body serves as the main support body for bearing water loads, and the downstream loess area 2 and the upstream rockfill area 1 jointly maintain the stability of the dam body.

[0032] Example 2

[0033] Based on Example 1, this example provides a geomembrane loess rockfill dam body partition structure, such as Figure 3 As shown, a lime soil layer 11 is provided between the downstream loess area 2 and the transition structure, and a lime soil layer 11 is provided between the dam foundation loess 3 and the transition structure.

[0034] Considering the dispersibility of loess, a 40cm~120cm thick lime soil layer 11 (modified loess layer) is laid on the loess filling material and the surface of the dam foundation.

[0035] Example 3

[0036] Based on Example 1, this example provides a geomembrane loess rockfill dam body partition structure, such as Figure 5 As shown, a transition zone 8 with a thickness of 40 cm to 120 cm is provided between the drainage body 7 and the upstream rockfill area 1, and a transition structure with a thickness of 40 cm to 120 cm is adopted between the drainage body 7 and the downstream loess area 2 and the loess of the dam foundation 3.

[0037] like Figure 6 As shown, a transition zone 8 is provided between the drainage body 7 and the upstream rockfill area 1 .

[0038] Example 4

[0039] Based on Example 1, this example provides a geomembrane loess rockfill dam body partition structure, wherein the upstream dam surface of the upstream rockfill area 1 is composed of a transition area 8 with a horizontal width of 3.0m to 4.0m, a drainage area 6, a second transition area 10 and a composite geomembrane 4 from inside to outside.

[0040] like Figure 2 As shown, the upstream dam surface adopts composite geomembrane 4 anti-seepage form.

[0041] Example 5

[0042] On the basis of Example 1, this example provides a geomembrane loess rockfill dam body partition structure, wherein the slope ratio of the boundary line between the upstream rockfill area 1 and the downstream loess area 2 is 1:0.3-1:1.

[0043] The main filling materials for the dam body are stone and loess. The upstream stone pile materials and downstream loess materials can be directly added to the dam for filling, which increases the direct filling rate of all excavated and usable materials during the filling period and facilitates construction.

[0044] Example 6

[0045] On the basis of Example 1, this embodiment provides a geomembrane loess rockfill dam body partition structure, wherein the transition structure between the upstream rockfill area 1 and the downstream loess area 2 comprises a transition area 8, a second transition area 10 and a first transition area 9 arranged sequentially from downstream to upstream;

[0046] The transition structure between the upstream rockfill area 1 and the dam foundation loess 3 includes a transition area 8, a second transition area 10 and a first transition area 9 which are arranged in sequence from top to bottom.

[0047] like Figure 3 As shown, between the upstream rockfill area 1 and the downstream loess area 2 are the transition area 8, the second transition area 10, the first transition area 9 and the 40-120 cm lime soil layer 11. Figure 4 As shown, between the upstream rockfill area 1 and the dam foundation loess 3, from top to bottom are a transition zone 8, a second transition zone 10, a first transition zone 9 and a gray soil layer 11.

[0048] Among them, the particle size in transition zone 8 is greater than the particle size in transition zone 2, which is greater than the particle size in transition zone 10.

[0049] Example 7

[0050] Based on Example 3, this example provides a geomembrane loess rockfill dam body partition structure, wherein the drainage body 7 is spaced 200~400m apart, the drainage body 7 is 3m~5m thick, and 5m~10m wide, and the drainage body 7 is inclined toward the downstream direction, with a slope ratio of 1:1.0~1:2.0.

[0051] like Figure 5As shown, the top of the drainage body 7 is connected to the blind drainage ditch at the bottom of the reservoir, inclined toward the downstream direction with a slope ratio of 1:1.0~1:2.0, and then extends downstream along the trend of the dam foundation loess 3.

[0052] Example 8

[0053] Based on Example 3, this example provides a geomembrane loess rockfill dam body partition structure, and the transition structure between the drainage body 7 and the loess in the downstream loess area 2 includes a transition zone 2 10 and a transition zone 1 9 arranged from bottom to top.

[0054] like Figure 7 As shown, between the drainage body 7 and the loess, from bottom to top, are the second transition zone 10, the first transition zone 9 and the gray soil layer 11.

[0055] In summary, the geomembrane loess rockfill dam provided by the utility model has a partitioned structure of the dam body, the downstream slope of the dam body adopts a frame beam and a grass-planted slope protection 5, and the upstream bank slope of the dam body adopts a composite geomembrane 4 for anti-seepage. On the basis of meeting the stability and anti-seepage of the dam body, the rockfill material and the loess material are combined, which can make full use of the excavated materials of the reservoir basin according to local conditions, and at the same time, considering the requirements of the supporting structure under the geomembrane, the combined use of loess material and block stone material, the block stone and loess material excavated from the material field can be reasonably used in the dam filling to achieve the balance of excavation and filling and reduce the waste residue; it has the characteristics of convenient construction, simple structure, economic rationality, safety and effectiveness, etc., which can effectively solve the problem of building earth-rock dams of pumped storage power stations under loess strata conditions, and can be promoted in pumped storage projects in the northwest region.

[0056] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are identical or similar to the present invention fall within the protection scope of the present invention.

Claims

1. A geomembrane loess rockfill dam body partition structure, characterized by: The dam comprises a dam foundation and a dam body, wherein the dam foundation is loess, and the dam body comprises an upstream rockfill area and a downstream loess area, wherein the boundary line between the upstream rockfill area and the downstream loess area is inclined toward the downstream side, and transition structures are arranged between the upstream rockfill area and the downstream loess area and the loess of the dam foundation, and drainage bodies are evenly distributed around the dam body, a composite geomembrane is arranged on the upstream dam surface of the upstream rockfill area, and a lattice beam and grass-planted slope protection are arranged on the downstream slope surface of the downstream loess area.

2. The geomembrane loess rockfill dam body partition structure according to claim 1, characterized in that: A gray soil layer is provided between the downstream loess area and the transition structure, and a gray soil layer is provided between the dam foundation loess and the transition structure.

3. The geomembrane loess rockfill dam body partition structure according to claim 1 is characterized by: A transition zone with a thickness of 40 cm to 120 cm is arranged between the drainage body and the upstream rockfill area, and a transition structure with a thickness of 40 cm to 120 cm is adopted between the drainage body and the downstream loess area and the loess of the dam foundation.

4. The geomembrane loess rockfill dam body partition structure according to claim 1, characterized in that: The upstream dam surface of the upstream rockfill area is composed of a transition zone with a horizontal width of 3.0m to 4.0m, a drainage zone, a second transition zone and a composite geomembrane from the inside to the outside.

5. The geomembrane loess rockfill dam body partition structure according to claim 1, characterized in that: The slope ratio of the boundary line between the upstream rockfill area and the downstream loess area is 1:0.3~1:

1.

6. The geomembrane loess rockfill dam body partition structure according to claim 1, characterized in that: The transition structure between the upstream rockfill area and the downstream loess area includes a transition area, a second transition area and a first transition area arranged in sequence from downstream to upstream; The transition structure between the upstream rockfill area and the dam foundation loess area includes a transition area, a second transition area and a first transition area which are arranged in sequence from top to bottom.

7. The geomembrane loess rockfill dam body partition structure according to claim 3, characterized in that: The drainage bodies are spaced 200-400 m apart, are 3-5 m thick, and 5-10 m wide. The drainage bodies are inclined toward the downstream direction, and a slope ratio of 1:1.0-1:2.0 is provided.

8. The geomembrane loess rockfill dam body partition structure according to claim 3, characterized in that: The transition structure between the drainage body and the loess in the downstream loess area includes a second transition zone and a first transition zone arranged from bottom to top.

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