Geomembrane loess rock-fill dam

Abstract

The utility model provides a geomembrane loess rock-fill dam, the cross section of the dam body is trapezoidal, the dam foundation is loess, the dam body subarea comprises a composite geomembrane of a rock-fill area, a loess area and an upstream dam face, the rock-fill area is connected with the loess area, one of the rock-fill area and the loess area is the upstream, the other one is the downstream, and the upstream dam face is provided with the composite geomembrane. The geomembrane loess rock-fill dam provided by the utility model combines the advantages of a rock-fill dam and a homogeneous earth dam, can utilize loess materials in an engineering area and building excavation materials to the greatest extent, realizes excavation and filling balance, reduces waste slag and influences on the environment, has the advantages of simple body type, convenience in construction, investment saving and the like, and is suitable for large-scale popularization and application. The method has good popularization value for the pumped storage power station damming engineering on the loess stratum in the northwest region.

Description

Technical Field

[0001] The utility model belongs to the technical field of earth-rock dam buildings, and in particular relates to a geomembrane loess rockfill dam. Background Art

[0002] Earth-rock dams have the characteristics of strong adaptability to geological and topographical conditions, local materials, and simple construction. They have become the most commonly used and fastest-growing dam type in the world's dam construction. Among the nearly 100,000 dams in my country, various earth-rock dams account for more than 95%. Earth-rock dams mainly include rockfill dams with stone as the dam material and homogeneous earth dams with uniform clay as the dam material.

[0003] At present, some pumped storage power station projects are being carried out in the northwest of my country. The loess ridges and hills are widely distributed in the region. The excavation foundation of the project area is a loess cover layer, which is collapsible and dispersed. Earth-rock dam is a more suitable dam type for construction. In order to meet the reservoir capacity requirements, pumped storage power stations generally require large-scale excavation, which will generate a lot of earth and stone material sources. In order to make full use of the earth and stone materials formed by excavation to build dams, meet the requirements of excavation and filling balance, and reduce the problems of soil and water conservation and environmental protection caused by the transportation, storage and protection of waste slag, how to make full use of and combine the loess and block stones in the project area as dam materials, and design a dam type that is convenient to construct, economical and reasonable, meets the requirements of dam body anti-seepage and stability, and can give full play to the performance of different materials, is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The utility model aims to provide a geomembrane loess rockfill dam, which is suitable for building a dam on a loess covering layer and overcomes the above-mentioned technical problems existing in the prior art.

[0005] To this end, the technical solution provided by the utility model is as follows:

[0006] A geomembrane loess rockfill dam comprises a rockfill area and a loess area, wherein the rockfill area and the loess area are connected, one of the rockfill area and the loess area is upstream and the other is downstream, and a composite geomembrane is arranged on the upstream dam surface.

[0007] The rockfill area is the upstream, and the loess area is the downstream.

[0008] The rockfill area is the downstream, and the loess area is the upstream.

[0009] The rockfill material in the rockfill area accounts for more than 55%, and the dividing line between the rockfill area and the loess area is inclined toward the downstream with an inclination of 15°-55°.

[0010] The proportion of rockfill materials in the rockfill area is no more than 60%, and the dividing line between the rockfill area and the loess area is inclined upstream with an inclination of 45°-70°.

[0011] The loess area is located below the rockfill area.

[0012] The rockfill material in the rockfill area accounts for less than 30%, and the dividing line between the rockfill area and the loess area is inclined upstream with an inclination of 15°-55°.

[0013] The loess area is located above the rockfill area.

[0014] The beneficial effects of the utility model are:

[0015] The geomembrane loess rockfill dam provided by the utility model combines the advantages of both rockfill dams and homogeneous earth dams, can make maximum use of loess materials in the engineering area and excavated materials from buildings, achieve a balance between excavation and filling, reduce waste slag and impact on the environment, has the advantages of simple shape, convenient construction, and investment savings, and has good promotion value for dam construction projects of pumped-storage power stations on loess strata in the northwest region. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of the first embodiment of the utility model;

[0017] Figure 2 It is a structural schematic diagram of a second embodiment of the utility model;

[0018] Figure 3 It is a schematic structural diagram of a third embodiment of the utility model;

[0019] Figure 4 It is a schematic structural diagram of a fourth implementation mode of the present utility model.

[0020] In the figure: 1. Loess area; 2. Rockfill area; 3. Composite geomembrane; 4. Loess. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] 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.

[0024] Example 1

[0025] This embodiment provides a geomembrane loess rockfill dam, comprising a rockfill area 2 and a loess area 1, wherein the rockfill area 2 and the loess area 1 are connected, one of the rockfill area 2 and the loess area 1 is upstream and the other is downstream, and a composite geomembrane 3 is provided on the upstream dam surface.

[0026] The geomembrane loess rockfill dam provided by the utility model has a dam body section in a trapezoidal shape, a dam foundation of loess 4, and dam body partitions including a rockfill area 2, a loess area 1 and a composite geomembrane 3 on the upstream dam surface.

[0027] The utility model compares and selects from multiple aspects such as topographic and geological conditions, material source conditions, technical characteristics of anti-seepage structures, construction conditions, operation and maintenance conditions, and project investment to determine the zoning layout, and at the same time needs to meet the relevant requirements in the rockfill dam design specifications. The upstream dam surface adopts a composite geomembrane 3 anti-seepage form. Since the reservoir dam and the reservoir basin foundation are covered with loess, it is more suitable to use flexible anti-seepage materials. In recent years, geomembranes have been widely used in pumped storage power stations and are technically feasible; at the same time, the ductility of geomembranes is better. From the perspective of the anti-seepage structure suitable for foundation deformation, geomembrane anti-seepage has stronger adaptability to uneven deformation and settlement of filling materials and loess foundation at the bottom of the reservoir.

[0028] Example 2

[0029] On the basis of Example 1, this example provides a geomembrane loess rockfill dam, wherein the rockfill area 2 is the upstream and the loess area 1 is the downstream.

[0030] The size of the rockfill area 2, the layout of the rockfill area 2 and the loess area 1, the slope ratio of the boundary between the rockfill area 2 and the loess area 1, and the dumping direction are determined based on factors such as the volume and quality of the excavated rockfill materials, the requirements for dam body anti-seepage and stability, and the distance of the material source.

[0031] Example 3

[0032] On the basis of Example 1, this example provides a geomembrane loess rockfill dam, wherein the rockfill area 2 is the downstream, and the loess area 1 is the upstream.

[0033] The rockfill area 2 is located downstream, which can limit the deformation of the loess in the upstream area, and the downstream dam slope can be appropriately slowed down to 1:1.4~1:2.0, reducing the cross-section of the dam body.

[0034] Example 4

[0035] On the basis of Example 2, this embodiment provides a geomembrane loess rockfill dam, wherein the rockfill material in the rockfill area 2 accounts for more than 55%, and the dividing line between the rockfill area 2 and the loess area 1 is inclined toward the downstream with an inclination angle of 15°-55°.

[0036] like Figure 1 As shown, in this embodiment, the rockfill area 2 and the loess area 1 are divided into upstream and downstream areas, the rockfill is located in the upstream area, the loess is located in the downstream area, and the dividing line between the rockfill and the loess is inclined toward the downstream, and the inclination is determined by the amount and mechanical properties of the rockfill, and is 15°~55°.

[0037] The rockfill area 2 is self-stable and less affected by loess deformation. It can effectively reduce the later deformation of the main rockfill area, provide good support for the anti-seepage system on the surface of the geomembrane, and have low requirements for the source of downstream loess materials and rolling parameters. The proportion of rockfill materials is high, greater than 55%, and the rockfill area 2 and loess area 1 need to be raised to the same elevation when the dam is filled. Therefore, it is suitable for projects with a high proportion of rockfill materials and simultaneous excavation of rockfill materials and loess materials.

[0038] Example 5

[0039] Based on Example 2, this example provides a geomembrane loess rockfill dam, wherein the rockfill material in the rockfill area 2 accounts for no more than 60%, and the dividing line between the rockfill area 2 and the loess area 1 is inclined upstream with an inclination of 45°-70°.

[0040] like Figure 2 As shown, in this embodiment, the rockfill area 2 and the loess area 1 are divided into upstream and downstream areas, the rockfill material is located in the upstream area, the loess is located in the downstream area, and the dividing line between the rockfill material and the loess is inclined toward the upstream, and the inclination is determined by the amount and mechanical properties of the loess material, and is 45°~70°.

[0041] Since the rockfill area 2 itself is not self-stable and is affected by loess deformation, it has high requirements for the source of downstream loess materials and rolling parameters. Among them, the proportion of rockfill materials is less than 60%, and the rockfill area 2 and loess area 1 need to be raised to the same elevation when the dam body is filled. Therefore, it is suitable for projects with a low proportion of rockfill materials and simultaneous excavation of rockfill materials and loess materials.

[0042] Example 6

[0043] On the basis of Example 2, this example provides a geomembrane loess rockfill dam, wherein the loess area 1 is located below the rockfill area 2.

[0044] As Figure 3 As shown, in this embodiment, the rockfill area 2 and the loess area 1 are divided into upper and lower areas, the rockfill material is located at the bottom, and the loess is located at the top. When the rockfill area 2 is located at the bottom, the later settlement deformation of the dam body is small.

[0045] Example 7

[0046] On the basis of Example 3, this embodiment provides a geomembrane loess rockfill dam, wherein the rockfill material in the rockfill area 2 accounts for less than 30%, and the dividing line between the rockfill area 2 and the loess area 1 is inclined upstream with an inclination angle of 15°-55°.

[0047] As Figure 4 As shown, in this embodiment, the rockfill and loess are divided into upstream and downstream areas, the loess is located in the upstream area, the rockfill is located in the downstream area, and the partition line between the rockfill and loess is inclined upstream, and the inclination is determined by the amount and mechanical properties of the rockfill, which is 15°~55°. The rockfill area 2 is located downstream, which can limit the deformation of the loess in the upstream area, and the downstream dam slope can be appropriately slowed down to 1:1.4~1:2.0, reducing the cross-section of the dam body. The proportion of rockfill in this scheme is low, less than 30%, and the rockfill area 2 and the loess area 1 need to be raised at the same elevation when the dam body is filled. Therefore, this scheme is suitable for projects with a low proportion of rockfill sources, and the rockfill and loess materials are excavated at the same time, and the cross-section of the dam body needs to be reduced.

[0048] Example 8

[0049] On the basis of Example 3, this example provides a geomembrane loess rockfill dam, wherein the loess area 1 is located above the rockfill area 2 .

[0050] The rockfill area 2 and the loess area 1 are divided into upper and lower areas, with the rockfill material at the top and the loess material at the bottom. This embodiment can make full use of the excavated materials, and the construction organization is relatively simple. Therefore, it is suitable for projects where the rockfill material and loess material are excavated in stages.

[0051] To sum up, the utility model combines the advantages of both rockfill dam and homogeneous earth dam, can maximize the use of loess materials and building excavation materials in the project area, achieve excavation and filling balance, reduce waste and impact on the environment, has the advantages of simple shape, convenient construction, and investment saving, and has good promotion value for pumped storage power station dam construction projects on loess strata in the northwest region.

[0052] 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, characterized in that: It includes a rockfill area and a loess area, wherein the rockfill area and the loess area are connected, one of the rockfill area and the loess area is upstream and the other is downstream, and a composite geomembrane is arranged on the upstream dam surface.

2. A geomembrane loess rockfill dam according to claim 1, characterized in that: The rockfill area is the upstream, and the loess area is the downstream.

3. The geomembrane loess rockfill dam according to claim 1, characterized in that: The rockfill area is the downstream, and the loess area is the upstream.

4. The geomembrane loess rockfill dam according to claim 2, characterized in that: The rockfill material in the rockfill area accounts for more than 55%, and the dividing line between the rockfill area and the loess area is inclined toward the downstream with an inclination of 15°-55°.

5. The geomembrane loess rockfill dam according to claim 2, characterized in that: The proportion of rockfill materials in the rockfill area is no more than 60%, and the dividing line between the rockfill area and the loess area is inclined upstream with an inclination of 45°-70°.

6. The geomembrane loess rockfill dam according to claim 2, characterized in that: The loess area is located below the rockfill area.

7. The geomembrane loess rockfill dam according to claim 3, characterized in that: The rockfill material in the rockfill area accounts for less than 30%, and the dividing line between the rockfill area and the loess area is inclined upstream with an inclination of 15°-55°.

8. The geomembrane loess rockfill dam according to claim 3, characterized in that: The loess area is located above the rockfill area.

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