A structure for intercepting and discharging rainwater inside a tailings pond

Abstract

The utility model relates to a rainwater interception and drainage construction structure inside a tailings pond, which solves the problem that the existing drainage structure cannot prevent precipitation from the waterless area upstream of the pond from entering the pond. The utility model comprises a plurality of rainwater interception and drainage ditches (1), the cross section of which is a trapezoid, the cross section size of each rainwater interception and drainage ditch gradually decreases from bottom to top, the cross section corners of the rainwater interception and drainage ditch (1) are fully smoothly transitioned and reinforced, the transverse slope of the rainwater interception and drainage ditch (1) is high in the middle, and gradually decreases toward the dam body on both sides, and a water gathering point (2) is formed near the dam body on both sides, a pipe (3) is installed at the rainwater interception and drainage ditch water gathering point (2) closest to the upstream of the liquid level, the water inlet of the pipe (3) is located at the lowest point of the water gathering point (2), the pipe (3) extends to the drainage ditch (4) outside the tailings pond, and the top elevation of the drainage ditch (4) is lower than the water gathering level elevation in the flood control embankment. The utility model reduces the construction cost of the tailings pond and improves the safety factor of the tailings pond.

Description

Technical Field

[0001] The utility model belongs to the field of interception and drainage of tailings ponds, and in particular relates to a construction structure for intercepting and discharging rainwater inside a tailings pond. Background Art

[0002] Flat-land tailings ponds are formed by building dams around flat terrain, usually with dams on three or four sides. An impermeable membrane is laid on the bottom of the pond and the dam surface to prevent the liquid in the reservoir from flowing out and polluting the environment or causing damage to the dam. Usually, in order to save construction investment, tailings ponds are built in stages.

[0003] In order to reduce the flood control pressure of the tailings pond and separate clean and dirty water, a ditches or retaining walls are usually set up on the side of the tailings pond without dam body to prevent water from entering the reservoir area outside the tailings pond.

[0004] The above commonly used interception and drainage structures have a common disadvantage, that is, they can only prevent precipitation outside the reservoir area from entering the reservoir, but cannot prevent precipitation from the waterless area upstream of the reservoir from entering. The inflow of this part of precipitation has little effect on the evaporation area, which is equivalent to a pure increase. It not only occupies the reservoir capacity and aggravates the water balance pressure of the dressing and smelting system, but also dilutes the metal concentration of the tailings return water and reduces production capacity. Utility Model Content

[0005] The utility model solves the problem that the current drainage structure cannot prevent precipitation in the waterless area upstream of the reservoir from flowing into the reservoir by providing a rainwater interception and drainage construction structure inside the tailings reservoir.

[0006] The utility model is realized by the following technical solutions:

[0007] A rainwater interception and drainage construction structure inside a tailings pond comprises a plurality of rainwater interception and drainage ditches 1 excavated at intervals of liquid level rise in a certain period of time, the cross-section of the interception and drainage ditch is trapezoidal, the cross-section size of each rainwater interception and drainage ditch gradually decreases from bottom to top, the cross-section corners of the rainwater interception and drainage ditch 1 are fully smoothly transitioned and reinforced, the transverse slope of the rainwater interception and drainage ditch 1 is high in the middle, and gradually decreases toward the dam bodies on both sides, and a water gathering point 2 is formed near the dam bodies on both sides, a pipe 3 is installed at the rainwater interception and drainage ditch water gathering point 2 closest to the upstream of the liquid level, the water inlet of the pipe 3 is located at the lowest point of the water gathering point 2, the pipe 3 extends to the external drainage ditch 4 of the tailings pond, the top elevation of the drainage ditch 4 is lower than the water level elevation of the flood control embankment,

[0008] There are three valves installed on the pipeline 3, namely the water inlet valve 5, the dam top water filling point valve 6 which can fill the pipeline 3 with water from the outside when opened, and the water outlet valve 7. The water outlet valve 7 is located outside the tailings pond adjacent to the drainage ditch, and the water inlet valve 5 is located inside the tailings pond.

[0009] The material of the pipe 3 is HDPE.

[0010] The structure of the utility model mainly has the following beneficial effects:

[0011] (1) Reduce the amount of rainwater that has no use value and enter the reservoir, thereby reducing the rate of reservoir capacity consumption;

[0012] (2) As the service life of the tailings pond is extended, not only can the expansion time be extended, but the dam height can also be reduced accordingly, thereby reducing the construction cost of the tailings pond;

[0013] (3) By reducing the amount of water in the reservoir during the rainy season, the rapid increase in liquid level caused by heavy rain can be effectively avoided, thereby improving the safety factor of the tailings pond. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0015] The utility model is a rainwater interception and drainage construction structure inside a tailings pond. Multiple horizontal interception ditches are excavated upstream of the flat-land tailings pond, and then film laying is performed to form rainwater interception and drainage ditches. The upstream precipitation collected in the rainwater interception and drainage ditch is intercepted and discharged to the outside of the pond by means of siphon or mechanical drainage, so as to slow down the liquid level rise speed in the pond, increase the service life of the tailings pond, reduce the construction cost of the tailings pond, and improve the safety factor of the tailings pond.

[0016] like Figure 1 As shown, it is assumed that a certain flat-type tailings pond has excavated multiple rainwater interception and drainage ditches 1 according to the interval of the liquid level rise in a certain period of time (a year, a rainy season, etc., which can be adjusted). Its cross-section is trapezoidal. From bottom to top, the cross-sectional dimensions of each rainwater interception and drainage ditch gradually decrease to meet the maximum rainstorm discharge demand at the top (excavation is too large, which increases the cost of engineering construction; excavation is too small, when the rainfall is heavy, some precipitation will overflow the rainwater interception and drainage ditch 1 and flow into the reservoir.). The corners of the cross-sectional area of ​​the rainwater interception and drainage ditch 1 are fully smoothed and reinforced to prevent the anti-seepage membrane from being damaged at this location. The lateral slope of the rainwater interception and drainage ditch 1 is high in the middle, and gradually decreases toward the dam body on both sides, forming a water gathering point 2 near the dam body on both sides.

[0017] After the tailings pond is put into use, according to the actual liquid level in the pond, a pipe 3 made of HDPE or other materials with an inner diameter of d is installed at the nearest rainwater interception and drainage ditch water collection point 2 upstream of the liquid surface. The water inlet of the pipe 3 is located at the lowest point of the water collection point 2, and the pipe 3 extends to the external drainage ditch 4 of the tailings pond. The top elevation of the drainage ditch 4 is lower than the elevation of the water collection level in the flood control embankment to ensure that siphoning can be achieved.

[0018] To achieve siphon drainage, three valves are installed on the pipeline 3, namely, the water inlet valve 5, the dam top water filling point valve 6, and the water outlet valve 7. Before the first siphon, the pipeline 3 needs to be filled with water using a water filling vehicle and other equipment. The specific implementation method is: close the water inlet valve 5 and the water outlet valve 7, open the dam top water filling point valve 6, use a water filling vehicle and other equipment to fill water into the pipeline, and close the dam top water filling point valve 6 for standby use after filling.

[0019] After each rainfall (or during rainfall if necessary), check the water accumulation in the rainwater interception and drainage ditch. When the rainfall causes the liquid level at the water collection point 2 to be higher than the elevation of the water inlet of the pipe 3, open the outlet valve 7 and the inlet valve 5 in succession (control the time interval, which should not be too long), and the water collected in the flood control embankment can be continuously pumped out and discharged through the siphon principle. When the rainwater in the interception and drainage ditch drops to near the top of the pipe, close the outlet valve 7 and the inlet 5 in succession (control the time interval, which should not be too long) to avoid the need to refill the pipe when it is opened next time.

[0020] Example:

[0021] Take a hydrometallurgical mine as an example. The designed service life is 7 years. The area where it is located is divided into dry season and rainy season, each lasting half a year. During the rainy season, heavy rain and extremely heavy rain occur frequently, and the liquid level of the tailings pond rises rapidly. Figure 1 As shown in the figure, referring to the rainfall and production discharge in previous years, it is calculated that the liquid level of the tailings pond rises by 2m in the first rainy season, and then decreases by 0.1m each year. Therefore, before the anti-seepage membrane laying project is carried out, according to the annual liquid level rise, a total of 6 rainwater interception and drainage ditches are excavated and constructed in the reservoir, with a trapezoidal cross-section. From bottom to top, the cross-sectional dimensions of each rainwater interception and drainage ditch gradually decrease to meet the maximum rainstorm discharge demand at the top. Excavation is too large, which increases the cost of engineering construction; excavation is too small, and when the rainfall is heavy, some precipitation will overflow the rainwater interception and drainage ditch 1 and flow into the reservoir. The corners of the cross section of the rainwater interception and drainage ditch 1 are fully smoothed and reinforced to prevent the anti-seepage membrane from being damaged at this location. The lateral slope of the rainwater interception and drainage ditch 1 is high in the middle, and gradually decreases toward the dam body on both sides, forming a water gathering point 2 near the dam body on both sides.

[0022] After the tailings pond is put into use, according to the actual liquid level in the pond, a DN160 HDPE pipe 3 is installed at the nearest rainwater interception and drainage ditch water collection point 2 upstream of the liquid surface. The water inlet of the pipe 3 is located at the lowest point of the water collection point 2, and the pipe 3 extends to the external drainage ditch 4 of the tailings pond. The top elevation of the drainage ditch 4 is lower than the elevation of the water collection level in the flood control embankment to ensure that siphoning can be achieved.

[0023] To achieve siphon drainage, three valves are installed on the pipeline 3, namely the water inlet valve 5, the dam top water filling point valve 6, and the water outlet valve 7. Before the first siphon, the pipeline 3 needs to be filled with water using a water filling truck or other equipment. The specific implementation method is: close valves 5 and 7, open valve 6, use a water filling truck or other equipment to fill water into the pipeline, and close valve 6 for standby after filling.

[0024] After each rainfall (or during rainfall if necessary), check the water accumulation in the rainwater interception and drainage ditch. When the rainfall causes the liquid level at the water collection point 2 to be higher than the water inlet elevation of the pipe 3, open valve 7 and valve 5 in succession (control the time interval, not too long), and the water collected in the flood control embankment can be continuously pumped out and discharged through the siphon principle. When the rainwater in the interception and drainage ditch drops to near the top of the pipe, close valves 7 and 5 in succession (control the time interval, not too long) to avoid the need to refill the pipe when it is opened next time.

Claims

1. A structure for intercepting and discharging rainwater inside a tailings pond, characterized by: The invention comprises a plurality of rainwater intercepting and drainage ditches (1) excavated at intervals according to the height of the liquid level rise in the reservoir within a certain period of time, the cross-section of the intercepting and drainage ditches is trapezoidal, the cross-section size of each rainwater intercepting and drainage ditch gradually decreases from bottom to top, the corners of the cross-section of the rainwater intercepting and drainage ditch (1) are fully smoothly transitioned and reinforced, the transverse slope of the rainwater intercepting and drainage ditch (1) is high in the middle and gradually decreases towards the dam body on both sides, and a water gathering point (2) is formed near the dam body on both sides, and a pipe (3) is installed at the rainwater intercepting and drainage ditch water gathering point (2) closest to the upstream of the liquid level, the water inlet of the pipe (3) is located at the lowest point of the water gathering point (2), and the pipe (3) extends to the drainage ditch (4) outside the tailings pond, and the top elevation of the drainage ditch (4) is lower than the water level elevation of the flood control embankment.

2. The structure for intercepting and discharging rainwater from a tailings pond according to claim 1 is characterized by: A total of three valves are installed on the pipeline (3), namely, a water inlet valve (5), a dam top water filling point valve (6) which can fill the pipeline (3) with water from the outside when opened, and a water outlet valve (7), wherein the water outlet valve (7) is located outside the tailings pond adjacent to the drainage ditch (4).

3. The structure for intercepting and discharging rainwater from a tailings pond according to claim 1 is characterized by: The material of the pipe (3) is HDPE.

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