Ecological reinforcement protection structure of tailing pond dam slope

Abstract

The utility model discloses an ecological reinforcement protection structure of a tailing pond dam slope, which belongs to the technical field of civil engineering and comprises a dam body, the dam body is provided with slide-resistant piles vertically penetrating through the dam body, seepage drainage floral tubes are horizontally laid in the dam body, a rock-fill prism is arranged at the downstream slope toe of the dam body, and the rock-fill prism is arranged on the dam body. The surface of the dam body is sequentially covered with a multi-stage inverted filter layer, a geogrid reinforcing rib, a block stone mesh bag and a fitting slope greening layer from inside to outside, and accumulated tailings are arranged on the left side of the dam body. The utility model develops a protective structure which not only can ensure the stability of the deep and shallow structures of the dam body, but also can effectively manage the internal seepage water, and can realize ecological restoration at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to civil engineering technical field especially relates to ecological reinforcement protection structure of tailing pond dam slope. BACKGROUND

[0002] Tailing pond is the important facility indispensable to mine production, is used to store the tailings discharged after dressing, and the stability of tailing pond, especially its dam body, is the most important for mine safety and environmental protection.

[0003] With the increase of tailing accumulation height, the dam body's own weight and the penetration pressure received also increase, which easily causes shear failure surface in deep layer, leads to overall instability or landslide, and causes disastrous consequences, and the conventional slope protection measures often only pay attention to the surface and are difficult to solve the deep sliding problem.

[0004] The dam body slope surface is exposed for a long time, is subjected to rainfall scouring and weathering effect, and is easy to cause the loss of surface soil and tailings, forms gully, destroys the slope surface structure, pollutes the environment, and also layer by layer weakens the stability of dam body, leading to shallow collapse.

[0005] The traditional dam slope protection mostly adopts pure engineering measures, such as mortar masonry slope protection, concrete spray protection and the like 'hard' protection, although a certain protection capacity is possessed, but the growth of vegetation is completely cut off, leading to the complete destruction of dam slope ecological system, the landscape is conspicuous, and is incompatible with the surrounding environment. UTILITY MODEL CONTENT

[0006] The utility model aims at: developing a protection structure which can guarantee the stability of deep and shallow layer structure of dam body, effectively manage internal penetration water, and also realize ecological recovery.

[0007] In order to realize the above object, the utility model adopts the following technical scheme: an ecological reinforcement protection structure of tailing pond dam slope, including dam body, the dam body is provided with anti -skid pile which vertically penetrates the dam body, the dam body is internally horizontally laid with drainage flower pipe, the dam body downstream slope foot is provided with rockfill prism, the dam body surface is covered with multistage inverse filter layer, geogrid reinforcement, block stone net bag and slope greening layer from inside to outside in turn, the left side of the dam body is provided with accumulated tailings.

[0008] As the further description of the above technical scheme: the anti -skid pile is reinforced concrete bored pile, and vertically penetrates the dam body and reaches bedrock or stable soil layer.

[0009] As the further description of the above technical scheme: the drainage flower pipe is double -walled corrugated punched pipe with inverse filter geotextile wrapped outside.

[0010] As the further description of the above technical scheme: the multistage inverse filter layer includes gravel layer, sandstone layer and geotextile from inside to outside in turn.

[0011] As the further description of the above technical solution: one end of the geogrid is anchored to the slope surface of the dam body, and the other end is laid and buried in the interior of the dam body along with the filling layering of the dam body.

[0012] As the further description of the above technical solution: the slope greening layer is formed by arranging nutrient soil in the grid and on the surface of the stone mesh bag and sowing plant seeds.

[0013] As the further description of the above technical solution: the drainage ditch is further arranged on the top of the stone prism, the inner wall of the drainage ditch and the surface of the stone prism are both paved with HDPE impermeable membrane, and the drainage ditch is communicated with the drainage flower pipe, so as to collect the internal seepage water and the slope surface runoff from the drainage flower pipe.

[0014] As described above, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0015] The anti-slide pile provides deep anti-sliding force to resist the overall sliding; the geogrid reinforcement enhances the shallow stability and integrity of the slope body; the stone prism provides counterpressure at the slope foot, and together forms a three-dimensional and multi-level stability system.

[0016] The rainfall infiltration water on the slope surface penetrates through the slope greening layer and the stone mesh bag, and then enters the dam body after being filtered by the multi-stage filter layer, and then the water is collected by the drainage flower pipe and introduced into the drainage ditch, so that the whole system effectively reduces the pore water pressure in the dam body, and ensures long-term stability.

[0017] The outermost stone mesh bag provides strong physical protection against hydraulic erosion, and the slope greening layer growing thereon further reduces water and soil loss through the soil fixation of plant roots and the interception of vegetation cover, and consumes water through transpiration, and with the passage of time, the dam slope will gradually integrate with the surrounding environment. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 The cross-sectional view of the utility model is shown;

[0019] Fig. 2 The cross-sectional view of the multi-stage filter layer of the utility model is shown.

[0020] LEGEND:

[0021] 10, dam body; 11, stone prism; 12, accumulated tailings; 13, HDPE impermeable membrane; 14, drainage ditch; 15, geogrid reinforcement; 16, stone mesh bag; 17, slope greening layer; 18, anti-slide pile; 19, drainage flower pipe;

[0022] 20, multi-stage filter layer; 21, gravel layer; 22, sand layer; 23, geotextile. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0024] Please refer to Figs. 1-2 The present application provides a technical solution: an ecological reinforcement and protection structure of a tailing pond dam slope, comprising a dam body 10 as a bearing main body, which is usually formed by layering compacted earth and stone materials, mining waste stones or treated coarse-grained tailings. In order to fundamentally ensure the overall stability of the dam body 10, an anti-slide pile 18 is arranged at the central position of the dam body 10 along the dam axis direction. The anti-slide pile 18 penetrates the dam body 10 vertically and extends into bedrock or stable soil layer. In the embodiment, the anti-slide pile 18 is preferably a reinforced concrete cast-in-place pile, with a diameter of 1.0-2.0 meters and a pile spacing of 4-8 meters. The specific parameters are determined according to the height of the dam body 10, geological conditions and stability calculation. The anti-slide pile 18 constitutes a rigid framework to resist deep sliding damage of the dam body 10.

[0025] In order to effectively control the saturation line inside the dam body 10 and prevent instability caused by excessive pore water pressure, a drainage flower pipe 19 is also horizontally laid inside the dam body 10. The drainage flower pipe 19 is preferably a double-wall corrugated perforated pipe made of high-density polyethylene material, with an outer layer wrapped with a filter geotextile to prevent fine particles from blocking the pipe. The drainage flower pipe 19 is arranged in layers and multiple rows inside the dam body 10, which can efficiently collect the seepage water inside the dam body 10 and discharge it to the drainage ditch 14 at the dam foot through the pipe system.

[0026] A rockfill prism 11 is arranged at the downstream slope foot of the dam body 10, i.e. the right side. The rockfill prism 11 is made of large-diameter and well-permeable block stones, with a triangular or trapezoidal cross section. The rockfill prism 11 serves as a pressure foot to increase the anti-slide stability of the dam slope. The left side of the dam body 10 is a stacked tailings 12.

[0027] On the slope surface of the dam body 10, a multi-layer structure is arranged in sequence from inside to outside. The multi-layer structure is a multi-stage filter layer 20 closely attached to the slope surface of the dam body 10. The multi-stage filter layer 20 is composed of multiple layers of materials with different particle sizes, which allows water to pass through smoothly while preventing the loss of fine-grained soil or tailings inside the dam body 10.

[0028] In this embodiment, the multi-stage counter-filtration layer 20 is composed of, from inside to outside, a layer of gravel 21, a layer of sandstone 22, and an outermost layer of geotextile 23. This structure, from coarse to fine and then to geotextile 23, ensures smooth drainage and soil stability.

[0029] Outside the multi-stage counter-filtration layer 20, a geogrid reinforcement 15 is laid. The geogrid reinforcement 15 is preferably made of high-strength polypropylene or polyester fiber material, with one end anchored to the slope surface and the other end extending and buried inside the dam body 10. The geogrid reinforcement 15 is laid in layers as the dam body 10 is filled. As a flexible reinforcement material, the geogrid reinforcement 15 significantly improves the tensile strength and integrity of the slope, effectively preventing shallow sliding.

[0030] At the outermost layer of the slope, a block stone mesh bag 16 is provided. The block stone mesh bag 16 is woven from high-strength, corrosion-resistant galvanized low-carbon steel wire and filled with block stones. The block stone mesh bag 16 forms a strong and permeable flexible slope protection, effectively resisting rainwater erosion and surface weathering, and adapting to slight deformation of the foundation.

[0031] To achieve ecological restoration, a slope greening layer 17 is also provided. The slope greening layer 17 is not simply placed between the geogrid and the mesh bag, but is implemented within and on the surface of the block stone mesh bag 16. Specifically, when filling the block stone mesh bag 16, nutrient soil is mixed and filled, or after the mesh bag is installed, a layer of nutrient soil is covered on its surface and suitable local climate grass and shrub seeds are sprayed and sown. The plant roots can penetrate the mesh bag and the counter-filtration layer, and take root in the shallow dam body 10, forming a living and self-repairing ecological protection system.

[0032] At the top of the rockfill prism 11, a drainage ditch 14 is provided. To prevent the collected water from infiltrating, HDPE impermeable membrane 13 is laid on the inner wall of the drainage ditch 14 and the surface of the rockfill prism 11 for impermeable treatment. The drainage ditch 14 not only receives internal seepage water from the drainage pipe 19, but also collects water discharged from the slope surface runoff, and finally leads away from the tailings area through pipeline and other facilities.

[0033] The anti-slide pile 18 provides deep anti-sliding force to resist overall sliding; the geogrid reinforcement 15 enhances the stability and integrity of the shallow layer of the slope; the rockfill prism 11 provides counter-pressure at the slope foot, together forming a three-dimensional, multi-level stable system.

[0034] Rainfall infiltration on the slope surface passes through the slope greening layer 17 and the block stone mesh bag 16, is filtered by the multi-stage counter-filtration layer 20, and then enters the dam body 10. The water is then collected by the drainage pipe 19 and introduced into the drainage ditch 14. The entire system effectively reduces the pore water pressure inside the dam body 10, ensuring long-term stability.

[0035] The outermost block stone net bag 16 provides strong physical protection against hydraulic erosion, and the slope-attached green layer 17 growing thereon further reduces water and soil loss through the soil fixation of plant roots and the interception of vegetation coverage, and consumes water through transpiration, so that the dam slope will gradually blend into the surrounding environment over time.

[0036] The above merely describes a preferred specific implementation of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art, within the technical scope disclosed by the present application, can make equivalent replacements or changes to the technical scheme and the inventive concept of the present application, and all of the above should be encompassed within the scope of protection of the present application.

Claims

1. An ecological reinforcement and protection structure for tailings dam slope, comprising a dam body (10), characterized in that: The dam body (10) is equipped with anti-slide piles (18) that penetrate vertically through the dam body (10). The dam body (10) is horizontally laid with drainage pipes (19). The downstream slope toe of the dam body (10) is equipped with a rockfill prism (11). The surface of the dam body (10) is covered from the inside out with a multi-level filter layer (20), geogrid reinforcement (15), boulders mesh bag (16) and slope greening layer (17). The left side of the dam body (10) is equipped with a tailings pile (12).

2. The ecological reinforcement and protection structure for tailings dam slope according to claim 1, characterized in that: The anti-slide pile (18) is a reinforced concrete cast-in-place pile that penetrates vertically through the dam body (10) and extends into the bedrock or stable soil layer.

3. The ecological reinforcement and protection structure for tailings dam slope according to claim 1, characterized in that: The drainage pipe (19) is a double-walled corrugated perforated pipe with an outer layer of reverse filter geotextile.

4. The ecological reinforcement and protection structure for tailings dam slope according to claim 1, characterized in that: The multi-stage filter layer (20) consists of a gravel layer (21), a sand and gravel layer (22), and a geotextile (23) from the inside out.

5. The ecological reinforcement and protection structure for a tailings dam slope according to claim 1, characterized in that: One end of the geogrid reinforcement (15) is anchored to the slope of the dam body (10), while the other end is laid in layers and buried inside the dam body (10) during its filling.

6. The ecological reinforcement and protection structure for a tailings dam slope according to claim 1, characterized in that: The slope-adhesive greening layer (17) is formed by placing nutrient soil in the mesh and on the surface of the boulders net bag (16) and sowing plant seeds.

7. The ecological reinforcement and protection structure for tailings dam slope according to claim 1, characterized in that: It also includes a drainage ditch (14) opened on the top of the rockfill prism (11), the inner wall of the drainage ditch (14) and the surface of the rockfill prism (11) are covered with HDPE geomembrane (13), and the drainage ditch (14) is connected to the drainage pipe (19) for collecting internal seepage water and slope runoff from the drainage pipe (19).

Images