CN112411708B - Combined plugging and dredging method for drainage chute and drainage culvert of tailing pond - Google Patents
Combined plugging and dredging method for drainage chute and drainage culvert of tailing pond Download PDFInfo
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- CN112411708B CN112411708B CN202011245468.9A CN202011245468A CN112411708B CN 112411708 B CN112411708 B CN 112411708B CN 202011245468 A CN202011245468 A CN 202011245468A CN 112411708 B CN112411708 B CN 112411708B
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/04—Pipes or fittings specially adapted to sewers
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/06—Methods of, or installations for, laying sewer pipes
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Abstract
The invention discloses a combined plugging and dredging method of a drainage chute and a drainage culvert of a tailing pond, which comprises the following steps of 1) plugging the drainage chute: the water inlet of the upstream drainage chute is respectively backfilled with stone blocks (3), broken stones (4) and melon and rice stones (5) from bottom to top for plugging from the water inlet of the upstream drainage chute, and an integrated prefabricated top cover plate (6) is arranged at the water inlet of the drainage chute; ) Plugging the drainage culvert: the method is characterized in that an inverted filter body which is not less than 5m long and is composed of stone blocks, broken stones and melon and rice stones is arranged from the outlet of a drainage culvert to the upstream, a certain number of PE drainage pipes for guiding drainage chutes and water seepage in the drainage culvert are pre-embedded in the drainage culvert before the drainage culvert is plugged, and a closed concrete retaining wall is arranged at the outlet of the drainage culvert. The method is based on the principle of blocking and dredging, has the advantages of simple method, strong operability, less engineering quantity and low engineering cost, and can effectively stop or reduce potential safety hazards and risks caused by blocking failure of the flood drainage system.
Description
Technical Field
The invention belongs to the technical field of treatment of a tailing pond flood drainage system, and particularly relates to a method for plugging a tailing pond flood drainage system based on a plugging and dredging principle, which can be widely applied to safe and effective plugging of an old tailing pond flood drainage system and a tailing pond flood drainage system to be closed.
Background
The flood discharge system is one of the key structures of the tailing pond and plays an important role in the safety and stability of the tailing pond. Tailings pond safety incidents caused by flood discharge system failure (whether in use or blocked) account for almost 50% of the total incidents. Some tailing accumulation dams are designed to have the height of more than 100m, flood drainage tasks are sequentially undertaken by several stages of flood drainage systems, and before a new stage of flood drainage system is formally started, the old flood drainage system needs to be safely and effectively plugged. In addition, after the tailing pond runs to the designed service life, the tailing pond needs to be closed, and for the tailing pond to be closed, the reliability cannot be guaranteed due to the effects of years of erosion, heavy pressure, shearing, surface subsidence and the like on the original flood drainage system. In order to effectively put an end to and reduce the hidden danger and risk brought by the uncertainty of the quality of the originally buried drainage structures, the hidden danger and risk are mainly expressed in the aspects of collapse, damage, sand leakage and the like of a flood drainage system, the old flood drainage system also needs to be safely and effectively plugged, and the stability and the downstream safety of the closed tailing pond are ensured. Therefore, whether the flood drainage system of the tailing pond can be safely and effectively plugged or not directly influences the safety and danger of the tailing pond.
At present, the blocking of the drainage system of the tailing pond has two methods, one is flexible blocking, namely, geosynthetic materials with the reverse filtration effect, such as non-woven geotextile, sand gravel, broken stone and other artificially synthesized or natural materials are used as a blocking body for blocking, and the drainage system after blocking can intercept tailing particles to enable the tailing particles to be deposited before or in the blocking body, and water can permeate through the blocking material. However, as the sediment thickness of the tailings is increased day by day, the water permeability of the plugging body is poorer and poorer, the water seepage amount is reduced gradually, and the purpose of plugging is finally achieved. The second is rigid plugging, which is plugging by rigid materials such as plain concrete, rubble concrete or grouted block stone and the like, and requires tight plugging and no water leakage.
Rigid plugging and flexible plugging are used, and the final purpose of the method is to successfully plug the flood drainage system. According to the two plugging principles, rigid plugging is that after self-plugging is finished, tailings and water seepage are blocked in front of a plugging body, and the outlet of a flood drainage system is used for solving the problem that water drips cannot leak; the flexible plugging means that after plugging is finished, along with the time, inverted filter bodies such as broken stones, gravels, non-woven geotextiles and the like are gradually deposited by fine-particle tailings, so that the water permeability of the plugging body is increasingly poor, and finally the tailings and the water seepage are blocked in front of the plugging body. No matter which kind of shutoff mode is adopted, the drainage system is by the shutoff back, because there is the high water level in the tailing storehouse, leads to having formed huge flood peak in shutoff body department, and under this kind of high flood peak effect, the shutoff body is bearing huge water pressure, and along with the time lapse, this strand of water pressure can break the shutoff body by oneself, leads to the shutoff to become invalid, has very big potential safety hazard, probably brings serious consequence even.
Disclosure of Invention
The invention aims to solve the problems of rigid plugging and flexible plugging in the prior art, and provides a combined plugging and dredging method for a drainage chute and a drainage culvert of a tailing pond so as to avoid or reduce potential safety hazards and environmental risks caused by plugging failure due to huge water pressure borne by a plugging body after plugging.
In order to achieve the purpose, the invention discloses a combined plugging and dredging method of a drainage chute and a drainage culvert of a tailing pond, which combines rigid plugging and flexible plugging modes and adopts the following technical scheme based on the plugging and dredging principles:
the invention relates to a combined plugging and dredging method for a drainage chute and a drainage culvert of a tailing pond, wherein a connecting well is arranged between the drainage chute and the drainage culvert, and the method is implemented by adopting the following technical scheme:
1) plugging of drainage chute
The first step is as follows: firstly, covering all chute cover plates of the drainage chutes, and adopting non-woven geotextile to densely fill gaps between the chute cover plates and the drainage chutes so as to prevent tailings from entering the drainage chutes through the gaps and realize water leakage and sand leakage prevention;
the second step is that: filling block stones, broken stones and melon and rice stones from bottom to top into the drainage chute from the water inlet of the upstream drainage chute for plugging, and sequentially forming a block stone plugging section, a broken stone plugging section and a melon and rice stone plugging section, wherein the length of the plugging section in the drainage chute is not less than 1/3 of the total section length of the drainage chute; the aggregates poured into the drainage chute each time are less and uniform, so that the accumulation phenomenon is prevented; in the construction process, in order to prevent the plugging body from depositing in the drainage chute, the plugging body is poked and tamped by using the long bamboo chips so as to be conveniently sent into a connecting well;
the third step: arranging an integrated prefabricated top cover plate at the water inlet of the drainage chute, wherein the section size of the top cover plate is required to completely wrap the water inlet of the drainage chute, and a gap between the water inlet of the drainage chute and the top cover plate is tightly filled by using non-woven geotextile;
2) plugging of drainage culvert
The first step is as follows: a reverse filter body which is not less than 5m long and is respectively composed of block stones, broken stones and melon and rice stones is arranged from the outlet of the drainage culvert to the upstream; pre-burying a certain number of PE drainage pipes (the specific number is comprehensively determined according to the inner diameter of the drainage culvert and the water quantity to be drained) for guiding water seepage in the drainage culvert and the drainage chute in the drainage culvert before plugging the drainage culvert, wherein the PE drainage pipes are floral pipes, the periphery of each PE drainage pipe is wrapped by two layers of non-woven geotextiles, and the PE drainage pipes are firmly tied by galvanized iron wires; the end part of the PE infiltration discharge pipe is also wrapped with two layers of non-woven geotextile and is firmly tied by galvanized iron wires. The PE seepage drainage pipe is used for guiding seepage water in the drainage chute and the drainage culvert.
The second step is that: and arranging a closed concrete retaining wall at the outlet of the drainage culvert for plugging the outlet of the drainage culvert, wherein the concrete grade of the retaining wall is not less than C30, the foundation is required to be located on an old soil layer and to penetrate into the ground to a depth of not less than 1.5m, and the section size of the retaining wall is required to completely wrap the outlet of the drainage culvert. The blocking wall is adopted for blocking, and the PE seepage drainage pipe is used for assisting, so that the reverse filter body is prevented from being flushed out of the drainage culvert by the gradually increased water pressure along with the time.
The particle size range of the lump stones is 5-25 cm, the particle size range of the broken stones is 0.5-2 cm, and the particle size of the melon and rice stones is less than 0.5 cm.
In order to ensure the effectiveness of plugging, the length of the plugging section in the drainage chute is preferably 1/3-3/7 of the total length of the drainage chute.
In the step 1), if the length of a plugging section in the drainage chute is L, then:
the length of the stone block is 0.40-0.55L;
the length of the crushed stone section is 0.25-0.40L;
the length of the melon and rice stone section is 0.15-0.25L.
In step 2), the total length of the anti-filter body composed of the stone blocks, the broken stones and the melon and rice stones is set to be l, then:
the length of the stone block is 0.40-0.50 l;
the length of the crushed stone section is 0.25-0.40 l;
the length of the stone section of the melon and rice is 0.15-0.25 l.
In practical application, the specification of the non-woven geotextile is 400g/m2And the specification of the PE seepage drainage pipe is phi 75 mm.
The combined plugging and dredging method for the drainage chute and the drainage culvert of the tailing pond has the following positive effects after the technical scheme is adopted:
(1) the drainage chute and the drainage culvert are plugged by the stones, the broken stones and the melon and rice stones, so that the plugging engineering quantity is small, and the engineering cost is low;
(2) the plugging method is simple and has strong operability;
(3) the plugging mode respectively absorbs the advantages of flexible plugging and rigid plugging, and the safety is good;
(4) the plugging principle is based on the plugging and dredging principle, and the practicability is strong;
(5) the uncertain potential safety hazard caused by plugging failure is avoided, and the social benefit and the economic benefit are remarkable.
Drawings
FIG. 1 is a sectional view of the structure of the drainage chute of the flood discharge system of the tailings pond plugged by the method of the present invention;
FIG. 2 is a cross-sectional view of the chute cover and the drainage chute of the method of the present invention;
FIG. 3 is a sectional view of the structure of the drainage culvert plugging of the flood drainage system of the tailing pond according to the method of the present invention;
the reference signs are: 1-chute cover plate; 2-non-woven geotextile; 3-lump stone; 4-breaking stone; 5-melon rice stone; 6-top cover plate; 7-PE drainage pipe; 8-connecting well; 9-blocking wall.
Detailed Description
In order to better describe the invention, the combined plugging and dredging method of the drainage chute and the drainage culvert of the tailing pond is further described in detail with reference to the attached drawings.
The structural section view of the method for plugging the drainage chute of the flood drainage system of the tailing pond shown in figure 1 and combined with figures 2 and 3 shows that the method for jointly plugging and draining the drainage chute and the drainage culvert of the tailing pond has the advantages that the connecting well 8 is arranged between the drainage chute and the drainage culvert and implemented by adopting the following steps:
1) plugging of drainage chute
The first step is as follows: firstly, the chute cover plate 1 of the drainage chuteAll are covered and adopt the specification of 400g/m2The non-woven geotextile 2 compactly fills a gap between the chute cover plates 1 and the drainage chute, prevents tailings from entering the drainage chute through the gap, and realizes 'water leakage and sand leakage prevention';
the second step is that: filling block stones 3, broken stones 4 and melon and rice stones 5 from bottom to top from a water inlet of the upstream drainage chute into the drainage chute for plugging, wherein the particle size range of the block stones 3 is 5-25 cm, the particle size range of the broken stones 4 is 0.5-2 cm, the particle size of the melon and rice stones 5 is less than 0.5cm, and a certain gradation is required; the aggregate poured into the drainage chute every time is less and uniform, so that the accumulation phenomenon is prevented; in the construction, in order to prevent the plugging body from depositing in the drainage chute, the plugging body is fed into the connecting well 8 by poking and tamping the long bamboo chips; the length of a sealing section in the drainage chute is required to be not less than 1/3 of the length of the drainage chute section; in practical application, if the length of a plugging section in the drainage chute is set to be L, then: the total length of the lump stone 3 is 0.45L, the length of the broken stone 4 is 0.35L, and the length of the melon and rice stone 5 is 0.20L.
The third step: an integrated prefabricated top cover plate 6 is arranged at the water inlet of the drainage chute, the section size of the integrated prefabricated top cover plate 6 is required to completely wrap the water inlet of the drainage chute, and the number of the integrated prefabricated top cover plate is 400g/m2The non-woven geotextile 2 fills and compacts a gap between the water inlet of the drainage chute and the top cover plate 6.
2) Plugging of drainage culvert
The first step is as follows: firstly, arranging a reverse filter body which is not less than 5m long and is respectively composed of block stones 3, broken stones 4 and melon and rice stones 5 from the outlet of the drainage culvert to the upstream, wherein the grain diameters of the block stones 3, the broken stones 4 and the melon and rice stones 5 are the same as the grain diameter, and the reverse filter body is sequentially arranged; a certain amount of PE drainage pipes 7 for leading the drainage chutes and water seepage in the drainage culvert are pre-embedded in the drainage culvert before the drainage culvert is plugged, the PE drainage pipes 7 are flower pipes with the diameter of 75mm, and 2 layers of 400g/m specification pipes are wrapped on the periphery2The non-woven geotextile 2 is firmly tied by galvanized iron wires; the end part of the PE seepage drainage pipe 7 is also wrapped by two layers of 400g/m specification2The non-woven geotextile 2 is firmly tied by galvanized iron wires. The PE seepage drainage pipe 7 is used for guiding seepage water in the drainage chute and the drainage culvert. In practical application, the total length of the reverse filter body consisting of the rock blocks 3, the broken stones 4 and the melon and rice stones 5 is set asl, then: the length of 3 segments of the lump stone is 0.46l, the length of 4 segments of the broken stone is 0.35l, and the length of 5 segments of the melon and rice stone is 0.19 l.
The second step is that: arranging a closed concrete blocking wall 9 at the outlet of the drainage culvert for blocking the outlet of the drainage culvert, wherein the concrete label of the blocking wall 9 is not less than C30, the foundation is required to be located on an old soil layer and extends into the ground to a depth of not less than 1.5m, the section size of the blocking wall 9 is required to wrap the outlet of the drainage culvert completely, and the situation that the anti-filter body is flushed out of the culvert by gradually increased water pressure along with the lapse of time is prevented.
The combined blocking and dredging method for the drainage chute and the drainage culvert of the tailing pond is applied to an old drainage system of a certain copper ore tailing pond and a closed pond design of the certain iron ore tailing pond respectively, has a good blocking effect and low engineering cost, avoids potential safety hazards and risks caused by blocking failure of the drainage system, and is highly evaluated by users.
Claims (6)
1. A combined plugging and dredging method for a drainage chute and a drainage culvert of a tailing pond is characterized in that a connecting well (8) is arranged between the drainage chute and the drainage culvert, and the combined plugging and dredging method adopts the following technical scheme:
1) plugging of drainage chute
The first step is as follows: firstly, covering all chute cover plates (1) of the drainage chute, and filling and compacting gaps among the chute cover plates (1) and the drainage chute by adopting non-woven geotextile (2) to prevent tailings from entering the drainage chute through the gaps;
the second step is that: the stone blocks (3), the broken stones (4) and the melon and rice stones (5) are respectively backfilled from the water inlet of the upstream drainage chute to the inside of the drainage chute from bottom to top for plugging, and the plugging body is conveyed into the connecting well (8) by poking and tamping long bamboo chips; 1/3, the length of the blocking section in the drainage chute is not less than the total length of the drainage chute;
the third step: arranging an integrated prefabricated top cover plate (6) at a water inlet of the drainage chute, wherein the section size of the top cover plate (6) is required to completely wrap the water inlet of the drainage chute, and a gap between the water inlet of the drainage chute and the top cover plate (6) is tightly filled by using a non-woven geotextile (2);
2) plugging of drainage culvert
The first step is as follows: a reverse filter body which is not less than 5m long and is respectively composed of a lump stone (3), a broken stone (4) and a melon and rice stone (5) is arranged from the outlet of the drainage culvert to the upstream; pre-burying a certain number of PE drainage pipes (7) for guiding water drainage chutes and water seepage in the drainage culvert before plugging the drainage culvert, wherein the PE drainage pipes (7) are floral pipes, and the periphery of the PE drainage pipes is wrapped with 1-3 layers of non-woven geotextile (2) and are firmly tied by galvanized iron wires;
the second step is that: a closed concrete retaining wall (9) is arranged at the outlet of the drainage culvert and used for blocking the outlet of the drainage culvert, the concrete mark number of the retaining wall (9) is not less than C30, the foundation is required to be located on an old soil layer and to penetrate into the ground to a depth of not less than 1.5m, and the section size of the retaining wall (9) is required to completely wrap the outlet of the drainage culvert.
2. The combined plugging and dredging method for the drainage chute and the drainage culvert of the tailing pond according to claim 1, wherein the method comprises the following steps: the particle size range of the lump stone (3) is 5-25 cm, the particle size range of the broken stone (4) is 0.5-2 cm, and the particle size of the melon and rice stone (5) is less than 0.5 cm.
3. The combined plugging and dredging method for the drainage chute and the drainage culvert of the tailing pond as claimed in claim 2, wherein the method comprises the following steps: the length of the blocking section in the drainage chute is 1/3-3/7 of the total length of the drainage chute.
4. The combined plugging and draining method of the drainage chutes and drainage culverts of the tailing pond according to claim 1, 2 or 3, wherein the method comprises the following steps: in the step 1), if the length of a plugging section in the drainage chute is L, then:
the length of the block stone (3) section is 0.40-0.55L;
the length of the crushed stone (4) section is 0.25-0.40L;
the length of the section of the melon-rice stone (5) is 0.15-0.25L.
5. The combined plugging and draining method of the drainage chutes and drainage culverts of the tailing pond according to claim 4, wherein the method comprises the following steps: in the step 2), the total length of a reverse filter body consisting of the lump stone (3), the broken stone (4) and the melon and rice stone (5) is set to be l, then:
the length of the stone block (3) section is 0.40-0.50 l;
the length of the crushed stone (4) section is 0.25-0.40 l;
the length of the section of the melon-rice stone (5) is 0.15-0.25 l.
6. The combined plugging and dredging method for the drainage chute and the drainage culvert of the tailing pond as claimed in claim 5, wherein: the specification of the non-woven geotextile (2) is 400g/m2And the specification of the PE seepage drainage pipe (7) is phi 75 mm.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011245468.9A CN112411708B (en) | 2020-11-10 | 2020-11-10 | Combined plugging and dredging method for drainage chute and drainage culvert of tailing pond |
| PCT/CN2021/111874 WO2022100168A1 (en) | 2020-11-10 | 2021-08-10 | Drainage chute and drainage culvert combined plugging and dredging method for tailings pond |
| ZA2021/10814A ZA202110814B (en) | 2020-11-10 | 2021-12-22 | Combined blocking and dredging method for drainage chute and drainage culvert of tailings pond |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011245468.9A CN112411708B (en) | 2020-11-10 | 2020-11-10 | Combined plugging and dredging method for drainage chute and drainage culvert of tailing pond |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112411708A CN112411708A (en) | 2021-02-26 |
| CN112411708B true CN112411708B (en) | 2022-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011245468.9A Active CN112411708B (en) | 2020-11-10 | 2020-11-10 | Combined plugging and dredging method for drainage chute and drainage culvert of tailing pond |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN112411708B (en) |
| WO (1) | WO2022100168A1 (en) |
| ZA (1) | ZA202110814B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112411708B (en) * | 2020-11-10 | 2022-05-27 | 中钢集团马鞍山矿山研究总院股份有限公司 | Combined plugging and dredging method for drainage chute and drainage culvert of tailing pond |
| CN115262499A (en) * | 2022-06-22 | 2022-11-01 | 中国水利水电第七工程局有限公司 | Diversion tunnel plugging construction method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2511162A1 (en) * | 2004-06-30 | 2005-12-30 | Barnard Construction, Inc. | Method and apparatus for constructing filter zones in earthfill dams |
| CN201162271Y (en) * | 2007-12-26 | 2008-12-10 | 南昌有色冶金设计研究院 | Flood-discharging and plugging apparatus of mine tailings warehouse |
| CN101672025A (en) * | 2009-09-09 | 2010-03-17 | 中国瑞林工程技术有限公司 | Method for plugging flood drainage chute cover plate of tailing reservoir |
| CN103741702A (en) * | 2014-01-16 | 2014-04-23 | 化工部长沙设计研究院 | Rigid plugging method for mine tailings pond drainage well |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6953528B2 (en) * | 2003-07-25 | 2005-10-11 | Nesfield Floyd E | Flow control suction barrier apparatus and system |
| CN112411708B (en) * | 2020-11-10 | 2022-05-27 | 中钢集团马鞍山矿山研究总院股份有限公司 | Combined plugging and dredging method for drainage chute and drainage culvert of tailing pond |
-
2020
- 2020-11-10 CN CN202011245468.9A patent/CN112411708B/en active Active
-
2021
- 2021-08-10 WO PCT/CN2021/111874 patent/WO2022100168A1/en active Application Filing
- 2021-12-22 ZA ZA2021/10814A patent/ZA202110814B/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2511162A1 (en) * | 2004-06-30 | 2005-12-30 | Barnard Construction, Inc. | Method and apparatus for constructing filter zones in earthfill dams |
| CN201162271Y (en) * | 2007-12-26 | 2008-12-10 | 南昌有色冶金设计研究院 | Flood-discharging and plugging apparatus of mine tailings warehouse |
| CN101672025A (en) * | 2009-09-09 | 2010-03-17 | 中国瑞林工程技术有限公司 | Method for plugging flood drainage chute cover plate of tailing reservoir |
| CN103741702A (en) * | 2014-01-16 | 2014-04-23 | 化工部长沙设计研究院 | Rigid plugging method for mine tailings pond drainage well |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA202110814B (en) | 2022-03-30 |
| CN112411708A (en) | 2021-02-26 |
| WO2022100168A1 (en) | 2022-05-19 |
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Effective date of registration: 20221102 Address after: 243000 No. 666 Xitang Road, Ma'anshan Economic Development Zone, Anhui Province Patentee after: MAANSHAN Mine Research Institute Co.,Ltd. Patentee after: HUAWEI METAL MINERAL RESOURCE EFFICIENT RECYCLING UTILIZATION NATIONAL ENGINEERING RESEARCH CENTER Co.,Ltd. Address before: 243000 No. 666 Xitang Road, Ma'anshan Economic Development Zone, Anhui Province Patentee before: MAANSHAN Mine Research Institute Co.,Ltd. Patentee before: HUAWEI METAL MINERAL RESOURCE EFFICIENT RECYCLING UTILIZATION NATIONAL ENGINEERING RESEARCH CENTER Co.,Ltd. Patentee before: SINOSTEEL MAANSHAN INSTITUTE OF MINING RESEARCH, ENGINEERING INVESTIGATION AND DESIGN Co.,Ltd. |