CN112459198A

CN112459198A - Tailing dam drainage system

Info

Publication number: CN112459198A
Application number: CN202011489722.XA
Authority: CN
Inventors: 杨双钢; 王铭明; 魏海; 闫毅志; 龚兴勇; 汪晨; 胡圣明; 余浩
Original assignee: Kunming University of Science and Technology
Current assignee: Kunming University of Science and Technology
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-03-09

Abstract

The invention discloses a tailing dam drainage system which comprises a plurality of drainage mechanisms, wherein each drainage mechanism comprises a water pump, a water inlet of each water pump is connected with a plurality of drainage main pipes, each drainage main pipe is connected with a collection water storage tank, and each water storage tank is wrapped by plastic materials and concrete. The method comprises the following steps of pre-embedding a plurality of sections of S-shaped seepage drainage pipes along an inclination angle of 30-50 of the height of the lower portion and the inner portion outside the top of an initial dam, wrapping the seepage drainage pipes by a first layer of geotechnical mat and a second layer of geotechnical cloth, and adding a 20-30 cm reversed filter layer on the outermost layer. The radiation areas of the S-shaped seepage drainage pipe and the vertical seepage drainage pipe are far larger than that of a common seepage drainage device, the S-shaped seepage drainage pipe collects pore water in tailings and flows to the water storage tank, the water storage tank can be used for periodically pumping the pore water by a water pump, and the pore water can also flow out of the initial dam through the action of gravity and is drained to the dam abutment flood intercepting ditch. There are installing frame, connecting pipe, vacuum pump at tailing dam accumulation dam top, open the vacuum pump and make S type drainage and seepage pipe produce the negative pressure, and the tailings dead weight produces the malleation simultaneously, and the increase greatly hole water velocity of efflux to the effectual drainage is oozed.

Description

Tailing dam drainage system

Technical Field

The invention belongs to the technical field of drainage and seepage of tailing dams, and relates to a drainage and seepage device for efficient water collection and high-speed drainage.

Background

With the continuous acceleration of the economic and social pace of China, the accelerated consumption of social resources is caused. The quantity of discharged ore in one of the major countries of mining industry is over hundred million tons every year, while the utilization value of the ore is only a small part, and most of the ore is stored in an artificial tailing pond in the form of tailings. At present, the number of tailings ponds in China exceeds 12000, wherein part of tailings ponds are in states of dangerous, dangerous and sick ponds, upstream damming is mostly adopted in the construction process of China and depends on the stability of a stacking dam, the stability of the stacking dam depends on the drainage consolidation degree, and drainage consolidation can be accelerated by correctly using a drainage and seepage system. However, in practical engineering, the drainage pipeline is easy to block, and the drainage and seepage device is too simple, so that the drainage and seepage capability is insufficient.

Disclosure of Invention

In order to solve the problems of blockage of a drainage pipeline and insufficient drainage and seepage capacity, the invention provides a tailing dam drainage and seepage system which can efficiently collect seepage water and discharge seepage water, is not easy to be physically blocked, can ensure that a seepage line of a tailing dam is early warned, and ensures the stability of the tailing dam.

The technical scheme of the invention is as follows:

1. a tailings dam drainage system comprising: the initial dam (1) and the accumulation dam (4) are characterized by also comprising flood intercepting ditches (16) with the outlets connected with the two sides of the dam crest of the initial dam and a water pump (2), the inlet of the water pump (2) is connected with the outlet of the main drainage and seepage pipe (3), the inlet of the main drainage and seepage pipe (3) is connected with the inside of the primary water storage tank (9), meanwhile, the outlet of the primary water storage tank (9) is connected with a flood interception ditch (16) communicated with the bottom of the initial dam (1), the inlet of the primary water storage tank (9) is connected with the outlet of the secondary water storage tank (9), meanwhile, an outlet of the vertical seepage drainage pipe (10) is connected with an inlet of the vertical seepage drainage pipe to be connected with the S-shaped seepage drainage pipe (5), an inlet of the S-shaped seepage drainage pipe (5) is communicated with an outlet of the connecting pipe (15), an inlet of the connecting pipe (15) is communicated with the vacuum pump (8), the vacuum pump (8) is arranged in the mounting frame (7), and the top of the mounting frame (7) is provided with a vent pipe (6) which penetrates through the top of the stacking dam and is filtered by non-woven geotextile (18) and a white steel net (17).

2. The main drainage and seepage pipe (3) is a steel pipe with the diameter of 200 mm-300 mm.

3. The S-shaped seepage drainage pipe is a steel pipe with seepage holes above the middle part of the pipe, no seepage holes below the middle part of the pipe and the diameter of 200-400 mm, and the S-shaped seepage drainage pipe is low outside and high inside and has an inclination angle of 30-50 when being installed; the outside of the S-shaped pipe is wrapped with a geotechnical mat and geotechnical cloth, and a 200 mm-300 mm reversed filter layer is additionally arranged on the outside; the S-pipes are separated into two rows to prevent uneven settling.

4. After the vacuum pump is started, the negative pressure zone generated by the vacuum pump enables the S-shaped pipeline buried in the tailings to form the negative pressure zone, the pressure generated by the self weight of the tailings is added, a water seepage hole is not formed in the vacuum pump by 40-50 m, so that the vacuum pipe is prevented from leaking air, and pore water in the tailings is filtered through the geotextile and the geotextile mat and then enters the pipeline through the water seepage hole above the middle of the S-shaped pipeline, so that the effect of forced drainage is achieved.

5. The water storage tanks (9) are arranged in different levels, the higher the level is, the larger the volume is, and the lower the inside of the drainage pipe between the water storage tanks (9) in different levels is, the inclination angle of 30-50 is adopted.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic view of the structure within a dam body of the present invention;

FIG. 2 is a top view of the S-shaped infiltration discharge pipe of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 1 in accordance with the present invention;

FIG. 4 is a schematic view of an S-shaped pipe structure according to the present invention;

in the figure: 1-initial dam, 2-water pump, 3-main drainage pipe, 4-stacking dam, 5-S type drainage pipe, 6-vent pipe, 7-mounting frame, 8-vacuum pump, 9-water storage tank, 10-vertical drainage pipe, 11-water seepage hole, 12-geotechnical mat, 13-geotechnical cloth, 14-inverted filter, 15-connecting pipe, 16-dam shoulder flood interception ditch, white steel mesh (17) and non-woven geotechnical cloth (18).

Detailed Description

FIG. 1, FIG. 2, FIG. 3, FIG. 4 show, this drainage and seepage system of tailing dam includes initial dam (1), pile up dam (4), its characterized in that still includes water pump (2) exit linkage initial dam crest both sides cut flood ditch (16), water pump (2) access connection drainage and seepage person in charge (3) export, drainage and seepage person in charge (3) access connection is inside one-level storage water tank (9), while one-level storage water tank (9) exit linkage leads to initial dam (1) bottom and cuts flood ditch (16), one-level storage water tank (9) access connection second grade storage water tank (9) export, also connect vertical drainage and seepage pipe (10) export vertical drainage and seepage pipe access connection S type drainage and seepage pipe (5) simultaneously, S type drainage and seepage pipe (5) import intercommunication connecting pipe (15) export, connecting pipe (15) import intercommunication vacuum pump (8), vacuum pump (8) are settled in installing frame (7), there is breather pipe (6) top and piles up dam top with nonwoven geotechnique (18) and white steel mesh for the top of dam (7) (17) And (5) filtering.

According to the scheme, the S-shaped seepage drainage pipe can be installed to form an inclination angle of 30-50, pore water in a dam body can be horizontally and vertically collected in a large area, the top of the S-shaped seepage drainage pipe is connected with the vacuum pump, when the vacuum pump is turned on, negative pressure is formed in the S-shaped seepage drainage pipe, positive pressure is generated in self weight of tailings, double pressure accelerates the liquid seepage drainage rate in the dam body, the S-shaped seepage drainage pipe is wrapped with the geotechnical mat and the geotechnical cloth, and the outermost layer is provided with the 200-300 mm reverse filter layer, so that the S-shaped seepage drainage pipe is prevented from being physically blocked.

In addition, the S-shaped seepage drainage pipe is used for draining water to the water storage tank (9) through the vertical seepage drainage pipe, the water storage tank is made of plastic, the water storage tank is wrapped by concrete with the thickness of 200 mm-300 mm outside and has larger volume according to the higher elevation classification level, the water storage tanks are connected through steel pipes with the thickness of 200 mm-300 mm, and finally the water flows to the first-stage water storage tank.

In addition, the inlet of the first-stage water storage tank is connected with the seepage drainage pipe at the outlet of the second-stage water storage tank, and the seepage drainage pipe between the water storage tanks adopts an inclination angle of 30-50 degrees with low outside and high inside. The outlet of the first-stage water storage tank is connected with two drainage and seepage main pipes, one is a flood interception ditch flowing to the dam bottom of the initial dam under the action of the self weight of water, and the other is a water pump for periodically pumping water, particularly in the case of rainstorm flood.

In addition, in order to enable the vacuum pump to work more efficiently, the vacuum pump is installed in the installation frame, the top of the installation frame is provided with an air vent, the air vent penetrates through the top of the accumulation dam, and in order to prevent the air vent from being blocked, the air vent is filtered by the non-woven geotextile and the white steel mesh.

Claims

2. The tailings dam drainage system of claim 1, wherein: the main drainage and seepage pipe (3) is a steel pipe with the diameter of 200 mm-300 mm.

3. The tailings dam drainage system of claim 1, wherein: the water storage tanks (9) are arranged in different levels, the higher the level is, the larger the volume is, and the lower the inside of the drainage main pipe between the water storage tanks (9) in different levels is, the inclination angle of 30-50 is adopted.

4. The tailings dam drainage system of claim 1, wherein: the S-shaped seepage drainage pipe is a steel pipe with seepage holes above the middle part of the pipe, no seepage holes below the middle part of the pipe and the diameter of 200-400 mm, and the S-shaped seepage drainage pipe is low outside and high inside and has an inclination angle of 30-50 when being installed; the outside of the S-shaped pipe is wrapped with a geotechnical mat and geotechnical cloth, and a 200 mm-300 mm reversed filter layer is additionally arranged on the outside; the S-pipes are separated into two rows to prevent uneven settling.

5. The tailings dam drainage system of claim 1, wherein: the water storage tank is a plastic water storage tank, and a layer of concrete with the thickness of 200 mm-300 mm is wrapped outside the plastic water storage tank; and the higher the elevation, the larger the number of stages and the larger the volume according to different elevation ranks.