A seepage water recovery facility downstream of a dam

Abstract

The present invention discloses a seepage water recovery facility downstream of a dam, comprising a water collection tank, a blind ditch and a pump station. The present invention adopts a method of constructing a seepage water recovery facility at the downstream dam body of a tailings pond to solve the leakage problem of the dam downstream of the tailings pond water body. The water collection tank is arranged next to the outlet of a flood discharge tunnel, the blind ditch is arranged at the dam foot of the dam downstream of the tailings pond water body, and the pump station is arranged next to the water collection tank; the dam body seepage water is collected and recovered by the blind ditch and the water collection tank, and the collected polluted water is transported to the reservoir area or the water treatment station for treatment via the pump station, completing the whole process of collecting and treating the seepage water. The present invention can effectively reduce the pollution to the environment caused by the dam body seepage water, and has the characteristics of low cost, low construction difficulty, convenient construction and obvious collection and recovery effect.

Description

Technical Field

[0001] The present invention relates to dam seepage water recovery in the technical field of water conservancy engineering, in particular to a dam downstream seepage water recovery facility. Background Art

[0002] Due to the complex environment of tailings ponds, some tailings pond dams have fallen into disrepair over time, resulting in severe water seepage in the downstream dam area of ​​the tailings pond. This phenomenon is highly concealed from environmental pollution and is very difficult to manage or control, especially in areas adjacent to important rivers, drinking water sources, and areas sensitive to the ecological environment. When pollution prevention and control measures are imperfect and governance and management measures are inappropriate, environmental risks and potential disasters are more prominent. How to effectively collect and recycle the seepage problem of tailings pond dams is particularly important for resolving the hidden pollution caused by acidic water, alkaline water, or heavy metal water to the surrounding environment, and plays an important role in protecting the ecological environment and reducing potential environmental risks and hidden dangers. Summary of the Invention

[0003] The purpose of the present invention is to provide a seepage water recovery facility downstream of a dam to address the deficiencies of the existing technology. The facility includes a collection pool, a blind ditch and a pump station. The present invention adopts the method of building a blind ditch and a collection pool at the dam body downstream of the tailings pond, and building a pump station next to the collection pool. The blind ditch and the collection pool collect and recover the seepage water from the dam body, and the collected polluted water is transported to the reservoir area or water treatment station for treatment through the pump station, completing the whole process of collecting and treating the seepage water to solve the pollution caused by the seepage water from the dam body to the surrounding environment. The facility has the characteristics of low cost, low construction difficulty, convenient construction and obvious collection and recovery effect.

[0004] The specific embodiment for realizing the object of the present invention is:

[0005] A dam downstream seepage water recovery facility includes a tailings reservoir downstream dam and a flood discharge tunnel outlet. The facility is characterized in that the facility consists of a water collection pool, a blind ditch, a pumping station, and PVC pipes. The water collection pool is located next to the flood discharge tunnel outlet, the blind ditch is located at the foot of the tailings reservoir downstream dam, and the pumping station is located next to the water collection pool.

[0006] The water collection tank is a rectangular or polygonal foundation pit dug under the foundation surface, with a cofferdam and a bottom plate cast with a reinforced concrete layer in the foundation pit, and an isolation layer, a bonding layer and an anti-corrosion layer provided on the inner surface of the reinforced concrete layer in sequence; a plurality of pipe openings are provided at the bottom of the water collection tank that are connected to the outside of the tank; a bentonite waterproof blanket layer is provided on the top surface of the cofferdam around the water collection tank, and piles are provided between the bentonite waterproof blanket layer and the foundation;

[0007] The blind ditch is set around the dam foot of the downstream dam of the tailings pond water body. The cross section of the blind ditch is inverted trapezoidal. A PVC flower pipe is laid along the bottom of the blind ditch. Several tees are provided on the PVC flower pipe. A crushed stone layer, a geotextile layer and a gravel layer are laid in sequence from the PVC flower pipe to the surface of the blind ditch.

[0008] One end of the PVC pipe is connected to the pipe opening in the water collection tank, and the other end is connected to the tee on the PVC flower pipe in the blind ditch;

[0009] The water suction pipe of the pump station is arranged in the water collecting pool, and the water outlet pipe of the pump station is arranged in the water body of the tailings reservoir.

[0010] The isolation layer is made of epoxy glass fiber reinforced plastic.

[0011] The anti-corrosion layer is made of acid-resistant board.

[0012] The bonding layer is made of epoxy putty.

[0013] The thickness of the bentonite waterproof blanket layer is between 0.5 and 1 times the thickness of the reinforced concrete layer.

[0014] The inserted piles are in the form of several pieces, one end of which is provided with a pile tip and a barbed tooth. The inserted piles are inserted into the bentonite waterproof blanket layer, and the pile tip and barbed tooth are embedded in the soil layer.

[0015] The water collecting tank is provided with an upper limit elevation of the liquid level and a lower limit elevation of the liquid level, and the lower limit elevation of the liquid level is located above the pipe mouth.

[0016] The setting elevation of the core of the PVC flower pipe in the blind ditch is equal to the upper limit elevation of the liquid level in the water collection tank.

[0017] The invention solves the pollution of the surrounding environment caused by water seepage in the tailings pond dam, and has the characteristics of low cost, small construction difficulty, convenient construction and obvious collection and recovery effect.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention builds a collection pool, a blind ditch and a pump station at the foot of the dam downstream of the tailings reservoir water body. The dam seepage water is collected and concentrated through the blind ditch and the collection pool, and the collected polluted water is transported to the reservoir area or water treatment station for treatment through the pump station, effectively reducing the pollution caused by the dam seepage to the environment.

[0020] 2. The present invention sets a blind ditch extending along the dam foot of the downstream dam of the tailings pond water body. In the blind ditch, a crushed stone layer, a geotextile layer and a gravel layer are laid in sequence from the PVC flower pipe to the surface of the blind ditch; the setting of the blind ditch effectively collects the seepage of the dam body downstream of the tailings pond water body, cuts off the infiltration of the seepage of the dam body into the surrounding environment, and effectively prevents the pollution of the surrounding environment caused by the seepage.

[0021] 3. The present invention collects seepage water from blind ditches and transports it to a water collection pool via a PVC pipe. Finally, the collected polluted water is transported to a reservoir or a water treatment station via a pump station for treatment, completing the entire process of collecting and treating seepage water. This is particularly effective in resolving hidden pollution caused by acidic water, alkaline water or heavy metal water to the surrounding environment, and plays an important role in protecting the ecological environment and reducing potential environmental risks.

[0022] 4. The present invention arranges the water collection pool beside the outlet of the flood discharge tunnel, which is beneficial to the buffering and collection of flood water during discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 A schematic diagram of the planar layout of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the water collection tank of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the blind ditch of the present invention. Implementation Method

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0028] See Figure 1 、 Figure 2 Taking a tailings pond as an example, the main structures of the tailings pond include a dam, a flood discharge tunnel and a water diversion tunnel. The flood discharge tunnel is arranged on the left bank of the dam and mainly consists of an inlet flood discharge well, a tunnel section and an outlet section. The downstream dam 1 of the tailings pond water body is a clay sloping wall slag dam, and the tailings pond water body is acidic. Due to the large seepage volume of the clay sloping wall slag dam, the acidic water body has been leaking for a long time, causing serious pollution to nearby rivers, drinking water sources and the ecological environment. Treatment is urgent.

[0029] The arrangement of the present invention:

[0030] See Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 The present invention sets a blind ditch 4 around the foot of the dam 1 downstream of the tailings reservoir water body, sets a water collection pool 3 next to the outlet 2 of the flood discharge tunnel, and sets a pump station 5 next to the water collection pool 3;

[0031] The present invention has a PVC flower pipe 41 laid along the bottom of the blind ditch 4, and a plurality of tees 411 are provided on the PVC flower pipe 41; a plurality of pipe openings 35 are provided at the bottom of the water collection pool 3, which are connected to the outside of the pool; the pipe openings 35 in the water collection pool 3 are connected to the tees 411 on the PVC flower pipe 41 in the blind ditch 4 via a PVC pipe 6;

[0032] The pump station 5 of the present invention is arranged beside the water collecting pool 3, the water suction pipe of the pump station 5 is arranged in the water collecting pool 3, and the water outlet pipe of the pump station 5 is arranged in the water body of the tailings reservoir.

[0033] The present invention works like this:

[0034] See Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 Water seeping from the vicinity of the downstream dam 1 of the tailings reservoir flows through the gravel layer 44, geotextile layer 43, and crushed stone layer 42 of the blind ditch 4 into the PVC flower pipe 41. The water entering the PVC flower pipe 41 flows into the water collection tank 3 through the tee 411, the PVC pipe 6, and the nozzle 35. When the water level in the water collection tank 3 reaches the upper limit of the liquid level, the pump station 5 starts to transport the collected polluted water to the reservoir area through the pump station. When the water level in the water collection tank 3 reaches the lower limit of the liquid level, the pump station 5 stops, and the cycle continues.

[0035] Since the elevation of the core of the PVC flower pipe 41 in the blind ditch 4 is the same as the upper limit elevation of the liquid level in the water collection tank 3, one end of the PVC pipe 6 is connected to the tee 411 of the PVC flower pipe 41, and the other end is connected to the pipe mouth 35 of the water collection tank 3; and the pipe mouth 35 is located below the lower limit elevation of the liquid level in the water collection tank 3. Therefore, there is a drop between one end and the other end of the PVC pipe 6, and the water in the PVC flower pipe 41 can flow into the water collection tank 3 by itself.

[0036] Construction of blind ditch of the present invention:

[0037] See Figure 1 、 Figure 2 、 Figure 4 According to the construction drawings, a blind ditch 4 is excavated around the excavation boundary line and slope requirements of the dam foot of the downstream dam 1 of the tailings pond water body. Unsupported mechanical excavation is used, and dump trucks are used to transport soil. After the excavation is completed and passed the inspection, a PVC flower pipe 41 is laid at the bottom of the blind ditch 4 and its position is fixed to prevent it from moving during the gravel backfill, avoiding the position of the tee 411 on the PVC flower pipe 41, and the gravel layer 42, geotextile layer 43 and gravel layer 44 are laid in sequence to complete the backfill.

[0038] Construction of water collection pool of the present invention:

[0039] See Figure 1 、 Figure 2 、 Figure 3, excavate the foundation pit of the water collection tank 3 according to the construction drawings. When excavating, the top of the foundation pit is sloped around the excavation edge, and unsupported machinery is used for excavation, and dump trucks are used to transport soil. During the excavation of the foundation pit of the water collection tank 3, a shovel can be used to dig a test pit around the foundation pit excavation platform to check the groundwater level and test the moisture content of the bottom soil sample, so as to timely grasp the groundwater level and soil layer conditions to better guide the next step of construction. After the foundation pit excavation is completed and qualified, a hand-held vibratory rammer can be used according to the requirements of the design drawings. Carry out earth compaction. If the soil quality is poor, fill the gravel cushion layer in layers and compact it. Then cast the reinforced concrete layer 31 bottom plate, reserve the pipe mouth 35, support the formwork, and cast the cofferdam of the reinforced concrete layer 31 in sequence until the concrete curing is completed. Subsequently, the isolation layer 32, bonding layer 36 and anti-corrosion layer 37 are constructed on the inner wall of the water collection tank 3 in sequence, and the bentonite waterproof blanket layer 33 is constructed on the top surface of the cofferdam of the water collection tank 3, and the piles 34 are set between the bentonite waterproof blanket layer 33 and the foundation.

[0040] The connection between the blind ditch and the water collection tank of the present invention:

[0041] See Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 , dig a trench for the PVC pipe 6 between each tee 411 of the PVC flower pipe 41 and the corresponding nozzle 35 of the water collection tank 3, lay the PVC pipe 6, connect one end of the PVC pipe 6 to the tee 411 on the PVC flower pipe 41, and connect the other end to the nozzle 35 in the water collection tank 3. After passing the inspection, backfill the trench with earth;

[0042] At the position of the tee 411 on the PVC flower pipe 41 of the blind ditch 4, a crushed stone layer 42, a geotextile layer 43 and a gravel layer 44 are laid in sequence for supplementary backfilling.

[0043] Construction of the pump station of the present invention:

[0044] See Figure 1 、 Figure 2 According to the construction drawings, a pump station 5 is built next to the water collection pool 3. The suction pipe of the pump station 5 is set in the water collection pool 3, and the outlet pipe of the pump station 5 is set in the water body of the tailings pond.

[0045] See Figure 1 、 Figure 2 、 Figure 3 In order to prevent leakage of the water collection pool 3, the present invention sequentially arranges an isolation layer 32, a bonding layer 36 and an anti-corrosion layer 37 on the bottom plate of the reinforced concrete layer 31 of the water collection pool 3 and the inner wall of the reinforced concrete layer 31 cofferdam, which can effectively improve the anti-corrosion and anti-leakage performance of the water collection pool 3, so as to ensure the water collection effect and extend the service life of the water collection pool 3.

[0046] Further, see Figure 1 、 Figure 2 、 Figure 3 In order to prevent the soil layer beside the water collection pool 3 from collapsing and to prevent mud from entering the water collection pool 3, the present invention sets a bentonite waterproof blanket layer 33 on the top surface of the cofferdam around the water collection pool, and the bentonite waterproof blanket layer 33 is fixedly connected to the foundation with several piles 34; to facilitate construction, a pile tip and a reverse tooth are provided at one end of the pile 34, the pile 34 is passed through the bentonite waterproof blanket layer 33, and the pile tip and the reverse tooth are embedded in the soil layer. The setting of the pile 34 effectively improves the stability of the bentonite waterproof blanket layer 33, avoids displacement, and effectively prevents mud from entering the water collection pool 3.

[0047] The present invention adopts the method of building a blind ditch and a water collection pool at the downstream dam body of the tailings pond, and building a pump station next to the water collection pool. The blind ditch and the water collection pool collect and recycle the dam body seepage water, and the collected polluted water is transported to the reservoir area or water treatment station for treatment through the pump station, completing the whole process of collecting and treating the seepage water to solve the pollution caused by the dam body seepage to the surrounding environment. The invention has the characteristics of low cost, low construction difficulty, convenient construction and obvious collection and recovery effect.

Claims

1. A dam downstream seepage water recovery facility, comprising a tailings reservoir water body downstream dam (1) and a flood discharge tunnel outlet (2), characterized in that: The facility consists of a water collection pool (3), a blind ditch (4), a pump station (5) and a PVC pipe (6). The water collection pool (3) is located next to the outlet of the flood discharge tunnel (2), the blind ditch (4) is located at the foot of the dam (1) downstream of the tailings reservoir water body, and the pump station (5) is located next to the water collection pool (3); The water collection pool (3) is a polygonal foundation pit dug under the foundation surface, and a cofferdam and a bottom plate cast with a reinforced concrete layer (31) are provided in the foundation pit. The inner surface of the reinforced concrete layer (31) is provided with an isolation layer (32), a bonding layer (36) and an anti-corrosion layer (37) in sequence; a plurality of pipe openings (35) are provided at the bottom of the water collection pool (3) and connected to the outside of the pool; a bentonite waterproof blanket layer (33) is provided on the top surface of the cofferdam of the water collection pool (3), and a pile (34) is provided between the bentonite waterproof blanket layer (33) and the foundation; The blind ditch (4) is arranged around the foot of the dam (1) downstream of the tailings reservoir water body. The cross section of the blind ditch (4) is in the shape of an inverted trapezoid. A PVC flower pipe (41) is laid along the bottom of the blind ditch (4). A plurality of tees (411) are provided on the PVC flower pipe (41). A crushed stone layer (42), a geotextile layer (43) and a gravel layer (44) are laid in sequence from the PVC flower pipe (41) to the surface of the blind ditch (4). One end of the PVC pipe (6) is connected to the pipe opening (35) in the water collection tank (3), and the other end is connected to the tee (411) on the PVC flower pipe (41) in the blind ditch (4); The water suction pipe of the pump station (5) is arranged in the water collecting pool (3), and the water outlet pipe of the pump station (5) is arranged in the water body of the tailings reservoir.

2. A dam downstream seepage water recovery facility according to claim 1, characterized in that: The isolation layer (32) is made of epoxy glass fiber reinforced plastic.

3. The dam downstream seepage water recovery facility according to claim 1, characterized in that: The anti-corrosion layer (37) is made of acid-resistant board.

4. The dam downstream seepage water recovery facility according to claim 1, characterized in that: The bonding layer (36) is made of epoxy putty.

5. The dam downstream seepage water recovery facility according to claim 1, characterized in that: The thickness of the bentonite waterproof blanket layer (33) is between 0.5 and 1 times the thickness of the reinforced concrete layer (31).

6. The dam downstream seepage water recovery facility according to claim 1, characterized in that: The piles (34) are in the form of several pieces. One end of each pile (34) is provided with a pile tip and a reverse tooth. The piles (34) are inserted into the bentonite waterproof blanket layer (33), and the pile tip and the reverse tooth are embedded in the soil layer.

7. The dam downstream seepage water recovery facility according to claim 1, characterized in that: The water collecting tank (3) is provided with an upper limit elevation of the liquid level and a lower limit elevation of the liquid level, and the lower limit elevation of the liquid level is located above the pipe opening (35).

8. The dam downstream seepage water recovery facility according to claim 1, characterized in that: The elevation of the core of the PVC flower pipe (41) in the blind ditch (4) is equal to the upper limit elevation of the liquid level in the water collecting tank (3).

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