Downstream dam slope seepage drainage device for lowering seepage line of tailing dam

Abstract

The downstream dam slope seepage drainage device comprises a plug, a suction filtration pipe, a vertical water conveying pipe, a connecting pipe and a transverse drainage pipe, the plug is located at the end of the whole seepage drainage device, the suction filtration pipe is connected to the upper portion of the plug, the vertical water conveying pipe is connected to the upper portion of the suction filtration pipe, the connecting pipe is connected to the upper portion of the vertical water conveying pipe, and the transverse drainage pipe is connected to the lower portion of the vertical water conveying pipe. A connector connected with a vacuum machine is arranged on the transverse drainage pipe, one end of the transverse drainage pipe is sealed, and a first valve capable of being opened and closed is arranged at an opening in the other end of the transverse drainage pipe. According to the downstream dam slope seepage drainage device for lowering the seepage line of the tailing dam, suction filtration and drainage can be actively carried out on the silted position in the tailing pond dam body, and suction filtration and drainage work with precise positioning can be carried out on the silted position possibly occurring at any time, so that the safety and stability of the tailing dam are guaranteed.

Description

Technical Field

[0001] The invention relates to a downstream dam slope seepage drainage device for reducing the infiltration line of a tailings dam, belonging to the technical field of tailings engineering. Background Art

[0002] Tailings dams often become clogged due to the presence of ultrafine tailings soil, causing the internal infiltration surface of the tailings dam to rise, thus threatening the safety of the dam. The existing solution is to lay a transverse drainage pipe inside the dam body, and wrap a geotextile on one side of the drainage pipe buried inside the dam body for anti-filtration to prevent the drainage pipe from clogging. However, the transverse drainage pipe mainly relies on the horizontal permeability of the water flow to passively drain water. When there is a more serious blockage inside the dam body, its drainage effect is not good. In addition, since the tailings slurry is discharged from the tailings pond from time to time, the blockage location cannot be determined in advance, and the pre-buried transverse drainage pipe cannot be accurately positioned for effective drainage, resulting in local blockage inside the dam body and causing the dam body infiltration line to rise. The dam body seepage will overflow on the downstream slope of the dam slope, which not only threatens the stability of the dam body, but also may cause infiltration damage and threaten the stability and safety of the dam body. For this reason, how to actively locate the blockage area inside the tailings dam body to accurately and efficiently drain the seepage to reduce the internal infiltration line of the dam body without affecting the normal operation of the dam and the tailings pond is a problem that technicians in this field need to solve urgently. Summary of the invention

[0003] The present invention is aimed at the technical problems existing in the prior art and provides a downstream dam slope drainage device for reducing the infiltration line of a tailings dam. The present invention can drain the downstream dam slope of the tailings dam where siltation has occurred and can accurately locate the drainage work at the part that may be silted up at any time, so as to ensure the stability and safety of the tailings dam.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a drainage device for reducing the downstream dam slope of the tailings dam infiltration line, characterized in that the drainage device includes a plug, a suction filter pipe, a vertical water pipe, a connecting pipe and a transverse drainage pipe, the plug is located at the end of the entire drainage device, the suction filter pipe is connected to the upper part of the plug, the vertical water pipe is connected to the top of the suction filter pipe, the connecting pipe is connected to the top of the vertical water pipe, and is used to connect the transverse drainage pipe on the dam top with the vertical water pipe buried in the dam, and the transverse drainage pipe is provided with an interface for connecting a vacuum machine, one end is sealed, and the other end is open and provided with a switchable valve.

[0005] As an improvement of the present invention, the drainage device also includes a water-gas separator, which is connected to the top of the vertical water pipe, and is mainly used to separate water and gas from the water filtered out from the tailings dam to prevent gas from entering and causing a decrease in the vacuum degree; and a spiral valve 2 is provided in the pipeline at one end above the water-gas separator, and the valve 2 is closed when drainage is not required on a daily basis, and is opened when drainage is required; a flange is provided above the valve 2 for fixed connection with the connecting pipe.

[0006] As an improvement of the present invention, the drainage device also includes a filter layer, which is wrapped around the suction pipe. The filter layer is mainly composed of three parts: an outer layer of filament woven geotextile, an inner layer of filter cloth geotextile and a filter filler between the two layers of fabric.

[0007] Among them, the upper and lower ends of the geotextile are knitted and closed, and the entire filter filling material is reinforced by threading the middle part of the filament woven geotextile and the filter cloth geotextile; according to the soil retention and drainage criteria of the filter layer, the grading requirements of the filter layer soil particles are calculated, and the filter layer soil particles that meet the actual engineering requirements are configured; at the same time, in this patented design, a new type of filter cloth geotextile is selected to participate in the design of drainage filtration.

[0008] As an improvement of the present invention, the plug head is a conical tip, which is mainly used for fixing the pipe downward when burying the pipe.

[0009] As an improvement of the present invention, the suction filter pipe is a stainless steel pipe with many water holes drilled on the pipe to allow water to flow through. The suction filter pipe with water holes is wrapped with a reverse filter layer. The reverse filter layer mainly plays a reverse filtering role to prevent mud and sand from entering the suction filter pipe and causing blockage.

[0010] As an improvement of the present invention, the connecting pipe is a curved pipe shaped like a "7", which is used to connect the horizontal drainage pipe on the dam top and the vertical water pipe buried in the dam, and the connection method at both ends is realized by flanges.

[0011] As an improvement of the present invention, the transverse drainage pipe is provided with an interface for connecting a vacuum machine, one end is sealed, and the other end is open and provided with a switchable valve. A pressure gauge is provided on the pipe body for monitoring the vacuum degree. When suction and filtration are not needed for drainage, the transverse drainage pipe can be put away. When suction and filtration are needed for drainage, the transverse drainage pipe is connected to the connecting pipe, and the valve is closed to create a vacuum negative pressure in the pipe, thereby achieving the purpose of pumping out the accumulated water in the clogged area in the dam. After the transverse drainage pipe is filled with water, the valve is opened to discharge the water out of the dam.

[0012] Compared with the prior art, the present invention has the following advantages. The present application provides a downstream dam slope drainage device for reducing the infiltration line of the tailings dam. A plurality of vertical suction pipes are first arranged on the downstream dam slope platform of the tailings dam. If the monitoring equipment finds that the infiltration line inside the dam body rises, the detachable horizontal drainage pipe is spliced ​​at a fixed length as needed, and the horizontal drainage pipe is flange-connected to the vertical water pipe above the part where suction and drainage is required by a connecting pipe. Then, the vacuum machine is tightly connected to the horizontal drainage pipe, and then the valve on the left side of the horizontal drainage pipe is closed, and the air in the horizontal drainage pipe is extracted by the vacuum machine. As the air in the pipe is continuously extracted, the accumulated water around the suction pipe is sucked into the vertical water pipe under the action of the pore pressure, and the vacuum indication number is observed, and the valve is opened to discharge the extracted liquid from the horizontal drainage pipe. For tailings dam projects in operation, clogging may occur at any time. Traditional drainage facilities are generally carried out by horizontal drainage pipes installed when filling the tailings dam. They mainly rely on the active penetration force of the water flow in the dam to drain the water, which is a passive drainage method. When the drainage pipe is clogged, the dam body cannot be dug up for repair. The downstream dam slope drainage device for reducing the infiltration line of the tailings dam proposed in the embodiment of the present application can actively drain the parts of the tailings dam body that have been clogged and accurately locate the clogged parts that may appear at any time. In addition, the embodiment of the present application is provided with a special anti-filtration layer around the suction filter pipe, which reduces the possibility of clogging at the mouth of the suction filter pipe. The buried pipe aperture of the embodiment of the present application can be controlled within a dozen centimeters, and the buried pipe will not affect the dam structure. It can be set on the downstream dam slope of the tailings dam, and has almost no effect on the overall stability of the tailings dam. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall device of the present invention,

[0014] Figure 2 It is a vertical cross-sectional view of the present invention,

[0015] Figure 3 This is a schematic diagram of the filter layer sewing.

[0016] Figure 4 This is a top view of the outside effect of the suction filter tube.

[0017] Figure 5 This is a schematic diagram of the expected precipitation effect of the present invention.

[0018] In the figure: 1. plug, 2. suction filter pipe, 3. filter layer, 4. vertical water pipe, 5. connecting pipe, 6. horizontal drainage pipe, 7. vacuum machine, 8. water-gas separator, 9. valve one, 10. valve two, 31. filament woven geotextile, 32. filter cloth geotextile, 33. filter filler, 34. knitted reinforcement wire, 11. outer hole wall, 12. filling filter layer soil particles, 13. flange, 14. filling clay, 51. foundation layer, 52. initial rockfill dam, 53. first-stage rockfill sub-dam, 54. second-stage rockfill sub-dam, 55. upstream reservoir water level, 56. tailings accumulation soil, 57. drainage device. DETAILED DESCRIPTION

[0019] In order to deepen the understanding of the present invention, the present embodiment is described in detail below with reference to the accompanying drawings.

[0020] Example: See Figure 2 , Figure 3A drainage device for reducing the downstream slope of the tailings dam infiltration line, the drainage device comprises a plug 1, a suction filter pipe 2, a vertical water pipe 4, a connecting pipe 5 and a transverse drainage pipe 6, the plug 1 is located at the end of the entire drainage device, the suction filter pipe 2 is connected to the upper part of the plug 1, the vertical water pipe 4 is connected above the suction filter pipe 2, the connecting pipe 5 is connected above the vertical water pipe 4, and is used to connect the transverse drainage pipe 6 on the dam top with the vertical water pipe 4 buried in the dam, the transverse drainage pipe 6 has an interface for connecting a vacuum machine 7, one end is sealed, and the other end is open and provided with a switchable valve 9. The drainage device also includes a water-gas separator 8, which is connected to the top of the vertical water pipe 4, and is mainly used to separate water and gas from the water filtered from the tailings dam to prevent gas from entering and causing a decrease in vacuum. A spiral valve 2 10 is provided in the pipeline at one end above the water-gas separator 8. When suction and drainage are not required in daily life, the valve 2 is closed, and when suction and drainage are required, the valve 2 is opened. A flange 13 is provided above the valve 2 for fixed connection with the connecting pipe. The drainage device also includes an anti-filtration layer 3, which is wrapped around the suction filter pipe. The anti-filtration layer is mainly composed of three parts, the outer layer is a filament woven geotextile 31, the inner layer is a filter cloth geotextile 32 and an anti-filtration filler 33 between the two layers of fabric. Among them, the upper and lower ends of the geotextile are knitted and closed, and the entire filter filling material is reinforced by threading the needle in the middle part of the filament woven geotextile and the filter cloth geotextile; according to the soil conservation and drainage criteria of the filter layer, the gradation requirements of the filter layer soil particles are calculated, and the filter layer soil particles that meet the actual engineering requirements are configured; at the same time, in this patent design, a new filter cloth geotextile is selected to participate in the design of drainage and anti-filtration. The plug 1 is a conical tip, which is mainly used for downward fixing when burying the pipe. The suction filter pipe 2 is a stainless steel pipe, and many water holes that allow water to flow through are drilled on the pipe. The suction filter pipe with water holes is wrapped around the anti-filter layer 3. The anti-filter layer mainly plays an anti-filter role to prevent sediment from entering the suction filter pipe and causing blockage. The connecting pipe 5 is a "7"-shaped curved pipe, which is used to connect the horizontal drainage pipe 6 on the top of the dam and the vertical water pipe 4 buried in the dam. The connection method at both ends is realized by flanges. The transverse drainage pipe 6 has an interface for connecting to a vacuum machine, one end of which is sealed, and the other end is open and provided with a switchable valve. A pressure gauge is provided on the pipe body to monitor the vacuum degree. When there is no need for suction and drainage, the transverse drainage pipe can be folded up. When there is need for suction and drainage, the transverse drainage pipe 6 is connected to the connecting pipe 5, and the valve is closed to create a negative pressure in the pipe, thereby achieving the purpose of pumping out the water in the blocked area of ​​the dam. When the transverse drainage pipe 6 is filled with water, the valve is opened to discharge the water out of the dam. Figure 5As shown in FIG. 1 , for the tailings dam model, it is mainly composed of a foundation 51, an initial rockfill dam 52, a first-stage rockfill sub-dam 53, a second-stage rockfill sub-dam 54, an upstream reservoir water level 55, and a tailings accumulation soil body 56. Under the influence of the upstream reservoir water level 55, before the installation of the drainage device 57, the original infiltration line position 58 of the tailings dam is shown as a blue dotted line. The drainage device 57 is buried from the top of the first-stage rockfill sub-dam 53 into the tailings accumulation soil body 56. After the drainage is started, the height of the infiltration line of the tailings dam will be partially reduced. Under the influence of the upstream reservoir water level 55, the expected infiltration line position 59 after drainage is shown as a green dotted line.

[0021] It should be noted that the above embodiments are not intended to limit the protection scope of the present invention, and equivalent changes or substitutions made on the basis of the above technical solutions all fall within the protection scope of the claims of the present invention.

Claims

1. A device for reducing the downstream slope seepage of a tailings dam infiltration line, characterized in that: The drainage device includes a plug, a suction filter pipe, a vertical water pipe, a connecting pipe and a transverse drainage pipe. The plug is located at the end of the entire drainage device, the suction filter pipe is connected to the upper part of the plug, the vertical water pipe is connected to the top of the suction filter pipe, and the connecting pipe is connected to the top of the vertical water pipe. It is used to connect the transverse drainage pipe on the dam top and the vertical water pipe buried in the dam. There is an interface for connecting a vacuum machine on the transverse drainage pipe, one end is sealed, and the other end is open and provided with a switchable valve.

2. The downstream dam slope drainage device for reducing the infiltration line of the tailings dam according to claim 1, characterized in that: The drainage device also includes a water-gas separator connected to the top of the vertical water pipe, and a spiral valve 2 is provided in the pipe at one end above the water-gas separator; a flange is provided above the valve 2 for fixed connection with the connecting pipe.

3. The downstream dam slope drainage device for reducing the infiltration line of the tailings dam according to claim 1, characterized in that: The drainage device also includes a filter layer, which is wrapped around the suction filter pipe. The filter layer is mainly composed of three parts: an outer layer of filament woven geotextile, an inner layer of filter cloth geotextile and a filter filler between the two layers of fabric.

4. The device for reducing the downstream slope seepage of the tailings dam infiltration line according to claim 1, characterized in that: The plug head is a pointed head with a cone shape.

5. The downstream dam slope drainage device for reducing the infiltration line of the tailings dam according to claim 2, characterized in that: The suction filter pipe is a stainless steel pipe, and a plurality of water holes are drilled on the pipe to allow water to flow through. The suction filter pipe with water holes is wrapped with a reverse filter layer.

6. The downstream dam slope drainage device for reducing the infiltration line of the tailings dam according to claim 2, characterized in that: The connecting pipe is a curved pipe shaped like a "7", which is used to connect the horizontal drainage pipe on the dam top and the vertical water pipe buried in the dam, and the connection method at both ends is achieved by flanges.

7. The downstream dam slope drainage device for reducing the infiltration line of the tailings dam according to claim 2, characterized in that: The transverse drainage pipe is provided with an interface for connecting to a vacuum machine, one end of which is sealed, and the other end is open and provided with a switchable valve. A pressure gauge is provided on the pipe body to monitor the degree of vacuuming.

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