CN214574437U - Flood control structure for closed tailing pond - Google Patents

Abstract

The utility model relates to the technical field of tailings ponds, in particular to a flood control structure of a closed-reservoir tailing pond, which comprises a flood control steep bank arranged at a certain distance from the beach top, a position far away from the beach top is provided with a reservoir tail ponding area, a beach surface drainage main ditch is arranged between the beach surface and the reservoir tail ponding area, a plurality of beach surface drainage branch ditches are arranged at the two sides of the beach surface drainage main ditch, and the beach surface drainage branch ditches can collect water into the beach surface drainage main ditch; arranging a dam abutment drainage ditch at the position of a dam abutment of the tailing dam, connecting a flood spillway between the reservoir tail water accumulation area and the dam abutment drainage ditch, and draining the beach surface catchment in the reservoir tail water accumulation area into the dam abutment drainage ditch through the flood way; except the first steep bank, other steep banks can be temporarily submerged by flood, beach surface catchment is discharged into a reservoir tail ponding area through a beach surface main drainage ditch and a beach surface branch drainage ditch, is discharged into a dam shoulder drainage ditch through a flood spillway and is finally guided into a downstream, and the structure is completely positioned in a visible range of the earth surface of the reservoir area of the tailings reservoir, so that the method is safe and reliable, saves investment, and is convenient to observe, manage and repair.

Description

Flood control structure for closed tailing pond

Technical Field

The utility model relates to a technical field in tailing storehouse especially relates to a close storehouse tailing storehouse flood control structure.

Background

The tailing pond is an important facility of mine engineering, and according to related requirements, the tailing pond which reaches the designed final stacking elevation or stops being used in advance due to the fact that the design final stacking elevation is not reached for various reasons should be closed. As shown in fig. 1, a flood drainage system of an existing tailing pond generally comprises a drainage well 111, a drainage pipe 222, a drainage chute, a tunnel and other structures, and generally, the flood drainage system is completely or partially buried by tailings along with the accumulation of the tailing pond, so that the concealment is strong, the operation condition of the flood drainage system is difficult to understand visually, and in the operation period of the tailing pond, a resource unit is usually hired to carry out video recording and structure detection on the flood drainage system of the tailing pond, so that the management difficulty is high, and the investment is high. The safety management is relatively weakened after the tailing pond is closed, maintenance is lacked for a flood discharge system, the tailing pond closing engineering is a permanent engineering, the structural quality of the flood discharge system is inevitably reduced gradually along with the passage of time, the requirements for structural maintenance and management are high, and the burden is heavy.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a safe and reliable, save investment, be convenient for maintain the closed reservoir tailing storehouse flood control structure of management, by flood control abrupt bank, beach face drainage main drainage ditch, beach face drainage lateral ditch, spillway isotructure constitute, the structure is whole to be located the visual within range of tailing storehouse district earth's surface, is convenient for observe, manage and restore.

In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme:

the utility model provides a flood control structure of closed reservoir tail mine reservoir on the one hand, including the flood control abrupt ridge that sets up a certain distance away from the beach top, the position of keeping away from the beach top sets up the reservoir tail ponding area, sets up beach face drainage main ditch between beach face to the reservoir tail ponding area, the both sides of beach face drainage main ditch set up a plurality of beach face drainage subchannels, and beach face drainage subchannel can be with the water inward-remittance in the beach face drainage main ditch; the tailings reservoir is provided with a dam abutment drainage ditch at the position of the dam abutment of the tailings dam, a flood overflow channel is connected between the reservoir tail water accumulation area and the dam abutment drainage ditch, and the beach surface catchment in the reservoir tail water accumulation area is drained into the dam abutment drainage ditch through the flood overflow channel.

In a possible technical scheme, the flood control scarps are one or more.

In a possible technical scheme, when the flood control steep bank has multiple channels, the height h1 and h2. of the top of the first and second steep banks meets h1> h2.

In a possible technical scheme, set up one deck geomembrane and geotechnological cloth between flood control abrupt bank and tailings contact surface, the geomembrane thickness is not less than 1.0mm, geotechnological cloth is not less than 500 g/square meter, geomembrane and geotechnological cloth embedding tailings are not less than 0.5m, lay one deck rubble protective layer on geomembrane and the geotechnological cloth, for the stone masonry fender on the rubble protective layer.

In a possible technical scheme, the beach surface drainage main ditch is perpendicular to the axis of the tailing dam.

In a possible technical scheme, the spillway is in the form of an open ditch, and a water inlet of the spillway is in a horn shape.

In a possible technical scheme, the water inlet is provided with a masonry apron.

The utility model discloses another aspect provides a construction method of close storehouse tail mine storehouse flood control structure, including following step:

s1, constructing a first steep sill at a position L1 away from the beach top, and tamping tailings within 2m of the axis of the steep sill to ensure that the relative density Dr is more than 0.6;

s2, building a beach surface drainage main ditch and a beach surface drainage branch ditch between the beach top and the first steep ridge, wherein the beach surface drainage main ditch is vertical to the axis of the dam and adopts a stone masonry structure; the beach surface drainage branch ditches are distributed at two sides of the beach surface drainage main ditch and are high at two sides and low in the middle;

s3, building a second steep sill at a position L2 away from the first steep sill, repeating the building method in the steps S1 and S2, and building a plurality of steep sills and beach surface drainage main ditches and beach surface drainage branch ditches among the steep sills;

s4, constructing a spillway, wherein the water inlet is horn-shaped, one side of the mountain body is located on the compact layer, and one side of the tailings needs to be compacted.

In a possible technical solution, in the step S1, L1 is greater than the minimum beach length specified by the specification.

In one possible technical scheme, set up one deck geomembrane and geotechnological cloth between flood control steep bank and tailings contact surface in step S1, the geomembrane thickness is not less than 1.0mm, geotechnological cloth is not less than 500 g/square metre, geomembrane and geotechnological cloth embedding tailings are not less than 0.5m, lay one deck rubble protective layer on geomembrane and the geotechnological cloth, for the stone masonry protection of starching on the rubble protective layer.

Compared with the prior art, the beneficial effects of the utility model are that: the flood control structure of the closed tailings reservoir comprises flood control steep ridges, a beach surface drainage main ditch, beach surface drainage branch ditches, a flood overflow channel and the like, wherein the flood control steep ridges can be one or more, the highest flood level cannot exceed the top elevation H1 of the first steep ridge, other steep ridges except the first steep ridge can be temporarily submerged by flood, beach surface catchment is converged into the beach surface drainage main ditch by the beach surface drainage branch ditches, is discharged into a reservoir tail accumulated water area through the beach surface drainage main ditch, is discharged into a dam shoulder drainage ditch by the flood overflow channel, and is finally led into a downstream, and the structure is completely positioned in the visible range of the ground surface of the tailings reservoir area, so that the observation, management and repair are facilitated, the flood control safety storage of the tailings reservoir is improved, the construction difficulty is small, the construction period is short, the management and maintenance are facilitated, maintenance personnel require to descend after the reservoir is closed, and the cost is saved; the problems that the flood drainage system consisting of the drainage well, the drainage pipe, the drainage chute, the tunnel and the like in the conventional tailing pond has high management difficulty, high maintenance cost and the like after the tailing pond is closed are solved.

Drawings

Fig. 1 is a structural schematic diagram of a flood drainage system of an existing tailings pond;

fig. 2 is a schematic plan layout structure of a flood control structure of a closed tailings pond according to an embodiment of the present invention;

fig. 3 is a schematic sectional view of the flood control sill;

fig. 4 is a schematic sectional structure view of a flood control structure of a closed tailings pond according to an embodiment of the present invention;

FIG. 5 is a schematic view of the spillway water inlet configuration;

reference numerals: 11-first flood control scarp; 12-second flood control scarps; 13-third flood prevention scarps; 111-drainage wells; 2-a beach surface drainage main ditch; 222-a drain pipe; 31-a first beach surface drainage branch trench; 32-a second beach surface drainage branch trench; 33-a third beach surface drainage branch trench; 4-spillway; 5-dam abutment drainage ditch; 6-barrier layer; 7-a macadam protective layer; 8-protecting and building stone mortar; 9-stone masonry apron.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in fig. 2 and 4, in the flood prevention structure of the closed tailings pond of the embodiment of the present invention, three flood prevention steep sills are arranged from the beach top to the tailings ponding area, wherein the distance from the first flood prevention steep sill 11 to the beach top is L1, the distance between the first flood prevention steep sill 11 and the second flood prevention steep sill 12 is L2, and the distance between the second flood prevention steep sill 12 and the third flood prevention steep sill 13 is L3; the flood control steep bank is used for improving the flood regulation storage capacity of the tailing pond, improving the flood discharge condition and increasing the flood control safe reserve of the tailing pond; the flood control scarps can be one or multiple, and are determined according to the flood control requirement; when a plurality of flood control steep ridges are built, steps need to be formed, and the steep ridge top elevations h1 and h2.. hn of the first and second steep ridge steep ridges need to meet the requirement that h1> h2.. so. After the flood with the maximum design frequency is put in a warehouse, the highest flood level cannot exceed the top elevation h1 of the first flood control steep bank, and other steep banks can be temporarily submerged; as shown in fig. 3, in order to prevent the steep bank from being damaged by long-term rainwater immersion, an impermeable layer 6 is arranged between the contact surface of the flood control steep bank and the tailings, the impermeable layer 6 is a layer of geomembrane and geotextile, the thickness of the geomembrane is not less than 1.0mm, the geotextile is not less than 500 g/square meter, the geomembrane and the geotextile are embedded into the tailings and are not less than 0.5m, a broken stone protective layer 7 is laid on the geomembrane and the geotextile, and a stone masonry protective layer 8 is laid on the broken stone protective layer 7; in the embodiment, a first beach face drainage branch ditch 31 is arranged between a beach top and a first flood prevention steep bank 11 on two sides of the beach face drainage main ditch, a second beach face drainage branch ditch 32 is arranged between the first flood prevention steep bank 11 and a second flood prevention steep bank 12, and a third beach face drainage branch ditch 33 is arranged between the second flood prevention steep bank 12 and a third flood prevention steep bank 13; the beach surface drainage branch ditch is generally in a divergence shape with high two sides and low middle, the beach surface drainage main ditch and the beach surface drainage branch ditch adopt an open ditch form, the beach surface drainage branch ditch collects water into the beach surface drainage main ditch, and the beach surface drainage main ditch and the beach surface drainage branch ditch are used for discharging flood water corresponding to the beach surface part and guiding the flood water into a reservoir tail water accumulation area; a dam abutment drainage ditch 5 is arranged at the position of the dam abutment of the tailing pond, a flood overflow channel 4 is connected between the pond tail water accumulation area and the dam abutment drainage ditch 5, and the beach surface catchment in the pond tail water accumulation area is drained into the dam abutment drainage ditch through the flood overflow channel and finally led into the downstream; as shown in fig. 5, the spillway 4 is in the form of an open ditch, and the water inlet is in the shape of a horn; in order to prevent the flood from being flushed, the water inlet is provided with a stone masonry apron.

The flood control structure of the closed tailing pond is completely positioned in the visible range of the earth surface of the area of the tailing pond, so that the observation, the management and the repair are convenient, the flood control safe storage of the tailing pond is improved, the construction difficulty is small, the construction period is short, the management and the maintenance are convenient, the requirement of maintenance personnel is reduced after the tailing pond is closed, and the cost is saved; the problems that the flood drainage system consisting of the drainage well, the drainage pipe, the drainage chute, the tunnel and the like in the conventional tailing pond has high management difficulty, high maintenance cost and the like after the tailing pond is closed are solved.

The utility model discloses building method of closed reservoir tailing storehouse flood control structure, including following step:

1) investigating and knowing the data of the tailing pond such as geographic position, rainfall distribution, original design and the like;

2) and carrying out flood calculation according to the conditions of catchment area, dry beach gradient, beach surface area and the like when the tailing pond is closed. Through flood regulation calculation, a trial algorithm is adopted, an optimal scheme is selected to determine relevant parameters, and the method mainly comprises the following steps: the number, the position and the structural size of the flood control steep bank, the positions, the trends, the slopes, the number and the structural sizes of the beach surface drainage main ditch and the beach surface drainage branch ditch, the arrangement position, the structural size and the trends of the spillway, and the like;

3) the beach surface is flat, a slope which changes from high to low from the beach top to the warehouse is formed, and no adverse slope or water accumulation pit exists;

4) constructing a first flood protection steep bank 11 at a position L1 away from the beach top, wherein L1 is greater than the minimum beach length specified by the specification; tamping the tailings within the range of 2m of the axis of the steep sill, and ensuring that the relative density Dr is more than 0.6; large deformation is prevented, and the steep bank is prevented from being damaged; wherein the minimum beach length specified by the specification is shown in table 1:

TABLE 1 minimum beach Length requirement

The flood control steep bank is generally 0.5-3.0 m in height and 0.5-1.0 m in top width, and adopts a stone masonry structure; the top elevation H1 and the bottom elevation H1' of the first flood control steep bank 11 are connected by a slope ratio k1(1: 2-1: 4) for convenient construction; in order to prevent the steep bank from being damaged by long-term rainwater soaking, an impermeable layer 6 is arranged between the contact surfaces of the tailings, the impermeable layer 6 is formed by one layer and one cloth of film, the thickness of the geotechnical film is not less than 1.0mm, the geotechnical film is not less than 500 g/square meter, and the thickness of the cloth of film embedded into the tailings is not less than 0.5 m. Paving a rubble protective layer on the cloth film, wherein the thickness of the rubble protective layer is 150-200 mm, d is 5-20 mm, and the soil content is not more than 10%; the stone chipper layer is used for protecting and building stone mortar, the thickness is more than 500mm, the mortar grade is not less than M10, and the strength of the stone block is not less than MU 20;

5) a beach surface drainage main ditch 2 and a first beach surface drainage branch ditch 31 are built between the beach top and the first flood control steep sill 11, the beach surface drainage main ditch is generally one, and one or more beach surface drainage branch ditches can be arranged according to different controlled catchment areas; the beach surface drainage main ditch and the branch ditches are generally of mortar stone structures, the wall thickness is more than 500mm, the mortar grade is not less than M7.5, the block stone strength is not less than MU15, and the structures such as prefabricated and cast-in-place reinforced concrete are adopted; in the embodiment, the beach surface drainage main ditch 2 is arranged to strive for short and straight line selection, is vertical to the axis of the dam and adopts a stone masonry structure; the thickness is more than 500mm, the mortar grade is not less than M10, and the strength of the stone block is not less than MU 20; the slope is generally close to that of the actually formed sedimentary beach, the excavation amount is reduced, and the paving slope is generally 0.5-3%; the section size is generally rectangular, and the width-to-height ratio is generally 1-1.5; the first beach surface drainage branch ditches 31 are distributed at two sides of the beach surface drainage main ditch 2 and are high at two sides and low in the middle; the arrangement gradient is generally 0.3% -0.5%, the arrangement gradient is converged into the main drainage ditch, the section size is generally rectangular, and the width-to-height ratio is generally 1-1.5;

6) building a second flood control steep bank 12 at a position L2 away from the first flood control steep bank 11, repeating the building method in the steps 4) and 5), and building a plurality of steep banks and beach surface drainage main ditches and beach surface drainage branch ditches among the steep banks;

7) constructing a spillway 4, wherein the spillway is in an open ditch form, a water inlet is in a horn shape, one side of a mountain body is located on a compact layer, and one side of tailings needs to be compacted; the spillway is generally rectangular and adopts a stone masonry structure, and a water inlet is provided with a 0.5m thick stone masonry apron; fully utilizing the old, connecting the newly-built spillway with the original dam abutment drainage ditch, and smoothly discharging flood;

8) after the construction of the flood discharge facilities is completed, the original flood discharge system is plugged.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (7)

1. A flood control structure of a closed reservoir tail mine reservoir is characterized by comprising flood control steep ridges which are arranged at a certain distance from a beach top, a reservoir tail water accumulation area is arranged at a position far away from the beach top, a beach surface drainage main ditch is arranged between a beach surface and the reservoir tail water accumulation area, a plurality of beach surface drainage branch ditches are arranged at two sides of the beach surface drainage main ditch, and the beach surface drainage branch ditches can collect water into the beach surface drainage main ditches; the tailings reservoir is provided with a dam abutment drainage ditch at the position of the dam abutment of the tailings dam, a flood overflow channel is connected between the reservoir tail water accumulation area and the dam abutment drainage ditch, and the beach surface catchment in the reservoir tail water accumulation area is drained into the dam abutment drainage ditch through the flood overflow channel.

2. The closed tailings pond flood control structure of claim 1, wherein the flood control scarps are one or more.

3. The flood control structure for the closed tailings pond of claim 2, wherein when the flood control scarps are multiple, the top elevations h1 and h2. of the scarps of the first and second steep banks meet h1> h2.

4. The flood control structure for the closed tailings pond according to claim 1, wherein an impermeable layer is arranged between the contact surface of the flood control steep bank and the tailings, the impermeable layer is a layer of geomembrane and a layer of geotextile, the thickness of the geomembrane is not less than 1.0mm, the thickness of the geotextile is not less than 500 g/square meter, the geomembrane and the geotextile are embedded into the tailings and are not less than 0.5m, a gravel protective layer is laid on the geomembrane and the geotextile, and the gravel protective layer is used for masonry stone protection.

5. The closed tailings pond flood control structure of claim 1, wherein the beach surface drainage main trench is perpendicular to the axis of the tailings dam.

6. The flood protection structure for the closed tailings pond of claim 1, wherein the spillway is in the form of an open ditch, and the water inlet of the spillway is in the shape of a horn.

7. The flood protection structure for the closed tailings pond of claim 6, wherein the water inlet is provided with a masonry apron.

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