CN114855762A - Device and method for closed-warehouse field sealing of tailing warehouse - Google Patents
Device and method for closed-warehouse field sealing of tailing warehouse Download PDFInfo
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- CN114855762A CN114855762A CN202210645787.1A CN202210645787A CN114855762A CN 114855762 A CN114855762 A CN 114855762A CN 202210645787 A CN202210645787 A CN 202210645787A CN 114855762 A CN114855762 A CN 114855762A
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- 238000007789 sealing Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims description 27
- 239000002689 soil Substances 0.000 claims abstract description 95
- 238000009825 accumulation Methods 0.000 claims abstract description 45
- 239000004927 clay Substances 0.000 claims description 34
- 239000002002 slurry Substances 0.000 claims description 27
- 238000005192 partition Methods 0.000 claims description 24
- 230000003014 reinforcing effect Effects 0.000 claims description 24
- 244000025254 Cannabis sativa Species 0.000 claims description 16
- 229920003023 plastic Polymers 0.000 claims description 16
- 239000004033 plastic Substances 0.000 claims description 16
- 239000004746 geotextile Substances 0.000 claims description 12
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 9
- 239000004800 polyvinyl chloride Substances 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 230000004888 barrier function Effects 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 6
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B79/00—Methods for working soil
- A01B79/02—Methods for working soil combined with other agricultural processing, e.g. fertilising, planting
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/10—Dams; Dykes; Sluice ways or other structures for dykes, dams, or the like
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/30—Landfill technologies aiming to mitigate methane emissions
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Abstract
The invention discloses a device for closing a tailing pond and sealing a field, which comprises a tailing accumulation area in front of a dam filled with a reclamation soil layer, a tailing accumulation area at the middle and rear parts of the pond area provided with a drainage system of the reclamation soil layer and a strengthening layer, and a partitioned ridge between the tailing accumulation area and the tailing accumulation area. The invention overcomes the defects of long construction period, large required earth volume, high transportation cost and large construction risk of low bearing capacity areas when the conventional machinery is adopted in the middle and rear tailing stockpiling areas of the reservoir area and the artificial backfilling earthing reclamation, breaks through the restriction of the characteristics of the tailings at the middle and rear parts of the tailing reservoir area and the bearing capacity of the foundation on the construction, improves the safety, improves the bearing capacity of the foundation, meets the construction requirement of the drainage and diversion system of the ground surface in the reservoir, meets the development and utilization requirements of the tailing reservoir field after the reservoir is closed, and has important significance on the development and utilization of the tailing reservoir field after the reservoir is closed.
Description
Technical Field
The invention relates to the technical field of tailing pond engineering, in particular to a device and a method for closing a tailing pond and sealing a field.
Background
The tailings pond is an important facility in mine production, is an artificially formed high-level debris flow hazard source, is an invisible environment pollution source, and is one of the major hazard sources of non-coal mines all the time. At present, when the domestic tailing pond is closed, the beach face of the tailing pond needs to be sealed, cohesive soil is usually adopted for backfilling and green covering, and the field is sealed after a surface drainage and diversion system is built.
According to the reclamation sealing scheme of the beach face, however, the shallow ground surface at the middle rear part of the tailing pond can be raised due to the strong soil squeezing effect in the backfilling process of the middle rear part area of the tailing pond area, so that the reclaimed field exceeds the designed reclamation elevation; meanwhile, the fine particle tailings at the middle and rear parts of the reservoir area are concentrated, the bearing capacity of the foundation is weak, machinery and personnel are difficult to directly enter the reservoir, and the construction difficulty and the construction risk are large; for some large-scale tailing ponds and small-scale tailing ponds which are short in production halt, large-area water accumulation areas usually exist at the middle and rear parts of the pond areas, and the construction period is greatly influenced; in addition, the bearing capacity of the beach surface foundation at the middle and rear parts of the wet tailing pond area is usually weak, and cannot meet the requirements of building a surface drainage diversion system and developing and utilizing a tailing pond site after the tailing pond is closed, so that the soft soil foundation after the backfilled and reclaimed at the middle and rear parts of the pond area needs to be treated by adopting methods such as drainage consolidation and the like so as to meet corresponding requirements.
Therefore, it is necessary to design a device and a method for closing and sealing a tailing pond to solve the technical problems of strong soil squeezing effect, high safety risk of direct soil covering, large construction difficulty, difficulty in meeting the bearing capacity of a foundation after backfilling, building of a ground surface drainage and diversion system, development and utilization of a tailing pond site and the like during the process of closing the tailing pond.
Disclosure of Invention
The invention aims to provide a device and a method for closing and sealing a tailing pond so as to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a device for closing and sealing a tailing pond, which comprises:
the device comprises a dam front tailing stacking area, wherein a reclamation soil layer is filled in the dam front tailing stacking area, the reclamation soil layer is obliquely arranged, and a grass seed greening layer is arranged on the surface of the reclamation soil layer;
the method comprises the following steps that a tailing accumulation area at the middle and rear part of a reservoir area is filled with a backfill soil layer, and a drainage system is arranged in the backfill soil layer; a reinforcing layer covers the backfill soil layer;
the partitioned ridges are built between the front tailing accumulation area of the dam and the middle and rear tailing accumulation areas of the reservoir area; and a plurality of slurry conveying devices are fixedly arranged on the partition soil ridges and extend to the tailing accumulation area at the middle rear part of the reservoir area.
Preferably, the cross section of the partition ridge is trapezoidal, the top end of the partition ridge is flush with the reclamation soil layer, the width of the bottom surface of the partition ridge is 2m-4m, and the width of the top surface of the partition ridge is 1m-3 m.
Preferably, the reclamation soil layer comprises a clay anti-seepage blocking layer and a near-surface loam reclamation layer which are sequentially arranged from bottom to top; the thickness of the clay anti-seepage barrier layer is 30cm-50cm, and the thickness of the near-surface loam reclamation layer is 30cm-50 cm.
Preferably, the clay anti-seepage blocking layer and the near-surface loam reclamation layer are obliquely arranged towards the subarea ridge, and the inclination is 1% -3%.
Preferably, the backfill soil layer comprises a clay backfill foundation layer, a loam backfill reclamation layer and a loam backfill greening layer which are sequentially arranged from bottom to top; the thickness of the clay backfill base layer is 30cm-50cm, and the thickness of the loam backfill reclamation layer is 30cm-50 cm.
Preferably, drainage system includes a plurality of plastics drain bar, and is a plurality of the bottom of plastics drain bar runs through the clay is backfilled the basal layer and is stretched into district is piled up to rear portion tailing in the reservoir area, the top of plastics drain bar stretches out loam is backfilled the afforestation layer and is connected with the drainage and is responsible for.
Preferably, the reinforcing layer comprises a non-woven geotextile, two layers of polyvinyl chloride films, a cohesive soil layer and a vacuum sealing film which are sequentially arranged from bottom to top; the non-woven geotextile covers the top end of the main drainage pipe.
A method for closed-end closing of a tailing pond comprises the following steps:
1) building a partitioned ridge, and dividing a tailing accumulation area in front of a dam and a tailing accumulation area at the middle rear part of a reservoir area;
2) filling a reclamation soil layer until the reclamation soil layer is flush with the top ends of the regional ridges, and laying a grass seed greening layer;
3) erecting slurry conveying equipment;
4) filling a backfill soil layer to a tailing accumulation area at the middle rear part of the reservoir area;
5) installing a drainage system;
6) paving a reinforcing layer, and vacuumizing and reinforcing the reinforcing layer and the backfill soil layer;
7) and paving a grass seed greening layer after the surface treatment of the reinforcing layer.
Preferably, in the step 4), the buoys are arranged in the process of pumping the backfill soil layer by the slurry conveying system, so that the slurry conveying equipment is supported and workers are provided for walking.
Preferably, in the step 6), the pressure for vacuum consolidation is 80kPa to 85 kPa.
The invention discloses the following technical effects:
(1) when the method is adopted for construction, accumulated water at the middle and rear parts of the reservoir area does not need to be specially discharged, earth covering construction is carried out in a mode of pumping the viscous soil slurry through the slurry conveying equipment, the viscous soil is lifted step by step after deposition, water flows naturally flow from the upper part of the viscous soil to the middle and rear parts of the reservoir area along the down slope, the water flows are collected and then discharged to the downstream of a tailing reservoir through the flood discharge shaft at the middle and rear parts of the reservoir area, the downstream backwater can be recycled, external water drainage and water drainage outside the reservoir can be avoided, the total construction period is short, and no environmental protection problems such as sewage discharge exist.
(2) The problem that the requirement of rear portion seal back is high to the cubic meter of earth and stone volume in the reservoir area is solved to this application, adopts mud conveying equipment to make behind the thick liquid with cohesive soil, loam simultaneously and discharges to the storehouse, has reduced the cost of transportation of cubic meter of earth and stone, and the backfill soil is lower to the soil property requirement in addition, adopts general cohesive soil, silt or lake facies, river facies sediment soil can all satisfy the requirement of slurrying, transport backfill, but greatly reduced closes the construction cost of storehouse engineering.
(3) When the method is used for closing the reservoir and sealing the field, the viscous soil slurry is discharged to the middle rear part of the reservoir area of the tailing reservoir through the slurry conveying pipeline, accumulated water is discharged after the completion of the discharge and deposition, and then the foundation is reinforced by adopting a mode of vacuumizing a reinforcing layer of a drainage system, so that the adverse effect caused by a soil squeezing effect during field sealing backfill is avoided.
(4) All the constructions of the application are carried out within the range of the tailing pond area, and meanwhile, the water for pulping the clay slurry is mainly accumulated at the middle rear part of the tailing pond area, does not relate to outside water, does not relate to outward discharge, reduces the environmental risk and meets the requirement of environmental protection.
(5) The novel method for closing the tailings reservoir and sealing the field is characterized in that the partitioned terraces are built in the tailings reservoir, meanwhile, the backfill soil layer on one side of the partitioned terraces close to the middle rear part of the reservoir area is controlled to be lower than the partitioned terraces by a certain height, enough safe superelevation and flood regulation reservoir capacity are reserved, the length of a dry beach is ensured, the partitioned terraces are reserved after the reservoir is closed, the problem that the flood regulation reservoir capacity is insufficient due to the fact that the slope of a beach surface is slowed down due to long time of the tailings reservoir after the reservoir is closed is solved, and the method is safe and favorable for flood regulation after the tailings reservoir is closed.
(6) This application adopts drainage system + back up coat evacuation's mode to handle to the back portion tailing pile up district soft soil foundation in the reservoir area after the backfill reclamation, and the requirement of building beach surface drainage diversion system when closing the storehouse can be satisfied to the foundation bearing capacity after the processing, satisfies the engineering construction demand that tailing storehouse place development utilized simultaneously, has important economic and social value.
(7) The method makes full use of the original flood drainage system in the construction process, does not need to add a new flood drainage system, and is beneficial to the safety of the tailing pond; meanwhile, the volume of earth and stone transportation related to the method is small, the requirement on road transportation capacity is low, the transportation requirement of closed-up sealing of the tailing pond can be met by the original road of the tailing pond, the traffic safety hazard is small, and safe construction is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a plan layout diagram of the device for closed-reservoir closing and sealing of a tailing reservoir according to the invention;
FIG. 2 is a schematic structural diagram of the device for closed-reservoir closing and field sealing of the tailing reservoir according to the invention;
FIG. 3 is a schematic view of the construction of a partitioned ridge of the present invention;
FIG. 4 is a schematic structural diagram of a tailing accumulation area before a dam according to the invention;
FIG. 5 is a schematic diagram of the structure of the tailing accumulation area at the rear part of the reservoir area according to the invention;
FIG. 6 is a ground level layout diagram of the device for closed-reservoir closing and sealing of the tailings reservoir according to the present invention;
FIG. 7 is a schematic view of the foundation structure of the device for closed-reservoir closing and sealing of the tailings reservoir according to the present invention;
wherein, 1, a tailing accumulation area before a dam; 2. soil layer reclamation; 3. a grass seed greening layer; 4. a tailing accumulation area at the middle rear part of the reservoir area; 5. backfilling the soil layer; 6. a drainage system; 7. a reinforcement layer; 8. partitioning ridges; 9. a slurry delivery device; 10. a clay impermeable barrier layer; 11. a near-surface loam reclamation layer; 12. backfilling the base layer with clay; 13. backfilling a reclamation layer with loam; 14. backfilling a greening layer with loam; 15. a plastic drain board; 16. a main drainage pipe; 17. non-woven geotextile; 18. a polyvinyl chloride film; 19. a cohesive soil layer; 20. vacuum sealing the membrane; 21. a float bowl; 22. a tailing dam; 23. a vacuum monitoring instrument; 24. a vacuum pumping device; 25. and (5) coffering.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1-7, the invention provides an apparatus for closed-end closing of a tailings pond, comprising:
the method comprises the following steps that (1) a pre-dam tailing stacking area 1 is filled with a reclamation soil layer 2, the reclamation soil layer 2 is obliquely arranged, and a grass seed greening layer 3 is arranged on the surface of the reclamation soil layer 2;
a tailing accumulation area 4 at the middle and rear part of the reservoir area, wherein a backfill soil layer 5 is filled in the tailing accumulation area 4 at the middle and rear part of the reservoir area, and a drainage system 6 is arranged in the backfill soil layer 5; a reinforcing layer 7 covers the backfill soil layer 5;
the partitioned ridges 8 are built between the tailing accumulation area 1 in front of the dam and the tailing accumulation area 4 at the middle rear part of the reservoir area; and a plurality of slurry conveying devices 9 are fixedly arranged on the partition ridges 8, and the slurry conveying devices 9 extend to the tailing accumulation area 4 at the middle rear part of the reservoir area.
The invention discloses a device for closing and sealing a tailing pond, which is characterized in that the tailing pond is divided into a front tailing accumulation area 1 of a dam and a middle and rear tailing accumulation area 4 of the pond through a partition ridge 8, wherein the front tailing accumulation area is backfilled by a mechanical layered backfilling mode to reclaim a reclamation soil layer 2, the middle and rear tailing accumulation area 4 of the pond is firstly constructed with a backfilling soil layer 5, then a drainage system 6 is constructed and then a reinforcing layer 7 is covered, and then the drainage system 6 and the reinforcing layer 7 are subjected to vacuum pressure pumping and reinforcing to improve the stability; and the slurry conveying equipment 9 on the partition ridges 8 is mainly used for pumping the viscous soil slurry to construct the backfill soil layer 5.
According to the further optimization scheme, the cross section of each partition ridge 8 is trapezoidal, the top ends of the partition ridges 8 are flush with the reclaimed soil layer 2, the width of the bottom surfaces of the partition ridges 8 is 2-4 m, and the width of the top surfaces of the partition ridges 8 is 1-3 m. The partition earth ridges 8 are mainly used for partitioning the tailing accumulation area 1 in front of the dam and the tailing accumulation area 4 in the middle and rear of the reservoir area and are used as support for backfilling and mounting positions of slurry conveying equipment 9; the partitioned ridges 8 are mainly made of cohesive soil, the plasticity index of the cohesive soil is greater than 17, and parts of mining waste rocks can be added or sand is adopted for bagging and then stacking to form ridges according to the requirements of the field environment and the bearing capacity, so that the strength of the partitioned ridges 8 is improved; and strictly controlling the construction quality of the partitioned ridges 8 in the building process. The stacking height meets the design safety ultrahigh requirement, and the bearing capacity meets the requirements of personnel walking and equipment layout.
Furthermore, the height of the zoning ridge 8 is not less than the maximum required thickness of the reclamation soil layer 2, and the height is 1m-2 m.
According to a further optimized scheme, the reclamation soil layer 2 comprises a clay anti-seepage blocking layer 10 and a near-surface loam reclamation layer 11 which are sequentially arranged from bottom to top; the thickness of the clay seepage-proofing blocking layer 10 is 30cm-50cm, and the thickness of the near-surface loam reclamation layer 11 is 30cm-50 cm; the clay impermeable barrier layer 10 and the near-surface loam reclamation layer 11 are obliquely arranged towards the zoning ridge 8, and the inclination is 1-3%. Firstly, backfilling 30-50cm of cohesive soil on the surface of a pre-dam tailing accumulation area 1 to serve as a clay anti-seepage barrier layer 10, then backfilling 30-50cm of loam above the clay anti-seepage barrier layer 10 to serve as a near-surface loam reclamation layer 11, controlling the clay anti-seepage barrier layer 10 and the near-surface loam reclamation layer 11 to form a certain gradient from a front-dam subregion ridge 8 in the earthing process, controlling the gradient to be 1% -3%, and sowing grass seeds on the surface of the near-surface loam reclamation layer 11 to perform greening after earthing to form a grass seed greening layer 3.
In a further optimization scheme, the backfill soil layer 5 comprises a clay backfill foundation layer 12, a loam backfill reclamation layer 13 and a loam backfill greening layer 14 which are sequentially arranged from bottom to top; the thickness of the clay backfill base layer 12 is 30cm-50cm, and the thickness of the loam backfill reclamation layer 13 is 30cm-50 cm. During construction, discharging the clay slurry to a tailing accumulation area 4 at the middle rear part of the reservoir area through a slurry conveying device 9 to form a clay backfill base layer 12, after the thickness of the clay backfill base layer 12 deposited by the clay slurry reaches 30-50cm, laying a buoy 21 above the clay backfill base layer 12 towards the middle rear part of the reservoir area, wherein the width of the buoy 21 is 0.8-1.5 m, and the length of the buoy is 30-100 m, flexibly adjusting the bearing capacity of the clay backfill base layer 12 after the previous discharge and deposition until the tailing area at the middle rear part of the reservoir area is completely covered by the clay backfill base layer 12, and finally starting an original flood discharge system to discharge all accumulated water in the reservoir; and after the hardness of the clay backfill base layer 12 reaches the standard, the steps are repeated again to backfill the loam slurry with the thickness of 30cm-50cm and settle to form a loam backfill reclamation layer 13.
Further, the mud conveying equipment 9 comprises a mud pump and a mud conveying pipeline, which are common equipment and are not described in detail herein.
According to a further optimization scheme, the drainage system 6 comprises a plurality of plastic drainage plates 15, the bottom ends of the plastic drainage plates 15 penetrate through the clay backfill foundation layer 12 and extend into the middle rear tailing accumulation area 4 of the reservoir area, and the top ends of the plastic drainage plates 15 extend out of the loam backfill greening layer 14 and are communicated with a drainage main pipe 16. Vertically inserting the plastic drainage plates 15 into the backfill soil layer 5 until the bottom end penetrates through the backfill soil layer 5, communicating the plastic drainage plates 15 through the main drainage pipe 16 to assist in draining accumulated water in the backfill soil layer 5, enabling the hardness of the backfill soil layer to reach the standard, and also serving as a framework to increase the strength of the backfill soil layer 5; and simultaneously used as a channel for later vacuum reinforcement.
In a further optimized scheme, the reinforcing layer 7 comprises a non-woven geotextile 17, two layers of polyvinyl chloride films 18, a cohesive soil layer 19 and a vacuum sealing film 20 which are sequentially arranged from bottom to top; a non-woven geotextile 17 covers the top end of the main drain pipe 16. A layer of non-woven geotextile 17 is laid on the main drainage pipe 16, and a polyvinyl chloride film 18, a cohesive soil layer 19 and a vacuum sealing film 20 are sequentially laid on the geotextile for ensuring sealing; the non-woven geotextile is used for increasing the bonding strength with the surface of the backfill soil layer; the polyvinyl chloride film 18 and the vacuum sealing film 20 are made of the same material and are used for keeping the sealing property; the clay layer 19 is for supporting the polyvinyl chloride film 18 and the vacuum sealing film 20.
A method for closed-end closing of a tailing pond comprises the following steps:
building a partition ridge 8, and dividing a tailing accumulation area 1 in front of a dam and a tailing accumulation area 4 at the middle rear part of a reservoir area; determining the minimum dry beach length of the tailings pond according to a measured topographic map of the current situation of the tailings pond, the capacity of the tailings pond, the dam height and the like, determining the distribution position of a subarea earth ridge 8 by combining the physical and mechanical property indexes of tailings and the calculated bearing capacity of the foundation of the tailings pond, building the subarea earth ridge 8, wherein the subarea earth ridge 8 is mainly made of cohesive soil, and according to the requirements of the field environment and the bearing capacity, part of mining waste rocks can be added or sand is bagged and then piled to form the earth ridge, so that the strength of the subarea earth ridge 8 is improved.
Filling a reclamation soil layer 2 until the reclamation soil layer is flush with the top ends of the regional ridges 8, and laying a grass seed greening layer 3; performing closed-warehouse reclamation construction of a pre-dam tailing accumulation area 1 between the subarea ridges 8 and the tailing dam 22, firstly backfilling with cohesive soil to form a clay impermeable blocking layer 10, wherein the backfilling process inclines from the tailing dam 22 to the subarea ridges 8 according to the gradient of 1% -3%, and the backfilling thickness is 30-50 cm; and after the clay impermeable blocking layer 10 is backfilled, carrying out down-slope backfilling by using loam to form a near-surface loam reclamation layer 11, wherein the backfilling thickness is 30-50cm, the loam close to one side of the partitioned soil ridge 8 is backfilled to be level with the partitioned soil ridge 8, sowing grass seeds on the surface layer of the backfilled area to form a grass seed greening layer 3 after the near-surface loam reclamation layer 11 is backfilled, and completing the closed reservoir reclamation sealing of the dam tailing accumulation area 1.
Erecting a slurry conveying device 9; firstly, slurry conveying equipment 9 is arranged near the partition ridges 8, slurry conveying pipelines are erected from the partition ridges 8 into the tailing accumulation area 4 at the middle and rear parts of the reservoir area, the interval of the outlets of the pipelines is controlled to be 10-50 m, and the conveying pipelines extend 3-10 m into the reservoir.
Filling a backfill soil layer 5 to a tailing accumulation area 4 at the middle rear part of the reservoir area; reclaiming the partitioned ridge 8 and the tailing stacking area at the middle and rear parts of the reservoir area, discharging viscous soil slurry into the tailing stacking area 4 at the middle and rear parts of the reservoir area to form a clay backfilling base layer 12 after the slurry conveying equipment 9 is erected, and paving a pontoon 21 above the clay backfilling base layer 12 towards the middle and rear part of the reservoir area after the thickness of deposited viscous soil reaches 30cm-50cm, wherein the width of the pontoon 21 is 0.8m-1.5m, the length of the pontoon is 30m-100m, and the specific length is determined according to the backfilling soil bearing capacity after the previous discharging and depositing; then discharging the loam slurry as loam to backfill the reclamation layer 13 until the thickness of the loam score reaches 30cm-50 cm; and repeating the operation in the step until the back-filling soil layer 5 is completely filled in the rear tailing accumulation area 4 in the reservoir area. And after the backfill soil layer 5 is constructed in the tailing accumulation area 4 at the middle and rear part of the reservoir area, removing the arch plate of the flood drainage well at the middle and rear part of the reservoir area to the elevation of the beach surface at the middle and rear part of the reservoir area after deposition, draining accumulated water in the reservoir, airing for a certain time, and reinforcing the soft soil foundation of the area at the middle and rear part of the reservoir area.
Installing a drainage system 6, paving a reinforcing layer 7, and vacuumizing and reinforcing the reinforcing layer 7 and the backfill soil layer 5; leveling the top surface of a backfill soil layer 5, and partitioning a tailing accumulation area 4 at the middle and rear parts of a reservoir area after leveling; then the construction is carried out according to the following steps:
firstly, laying a working cushion layer on a leveled subarea site, and inserting plates of plastic drainage plates 15 by adopting a crawler-type plate inserting machine according to the design, wherein the plastic drainage plates 15 are vertically inserted;
burying a vacuum monitoring instrument 23 after the work of the plastic drainage plate 15 inserting plate is finished, burying a main drainage pipe 16, wherein the main drainage pipe 16 is connected with the vertical plastic drainage plate 15, and the outer end of the main drainage pipe 16 is connected with a vacuumizing device 24;
thirdly, laying a layer of non-woven geotextile 17 on the main drainage pipe 16, laying a polyvinyl chloride film 18, a cohesive soil layer 19 and a vacuum sealing film 20 on the geotextile in sequence, digging grooves around each partition after finishing, laying edges of the polyvinyl chloride film 18 and the vacuum sealing film 20 along the groove bottom for ensuring sealing, and backfilling with cohesive soil to form a cofferdam 25 after finishing;
starting pre-vacuumizing, starting water covering and pre-pressing after the pressure under the membrane reaches 80-85 kPa and is stable, stopping vacuumizing and leveling after the consolidation degree and post-construction settlement meet the design requirement value after a certain time, and finishing the foundation consolidation treatment of the subarea;
fifthly, reinforcing the foundation of other subareas according to the sequence of the first to the fourth.
After the surface of the reinforcing layer 7 is treated, the grass seed greening layer 3 is laid; after all the partitioned foundations are treated and reinforced, uniformly building a beach surface drainage and diversion system in the tailing pond, and closing the tailing pond and sealing the field after the building is finished; then grass seeds are sowed for greening to form a grass seed greening layer 3.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above embodiments are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. A device that is used for tailing storehouse closed bank to seal a yard, characterized by, includes:
the device comprises a dam front tailing stacking area (1), wherein a reclamation soil layer (2) is filled in the dam front tailing stacking area (1), the reclamation soil layer (2) is obliquely arranged, and a grass seed greening layer (3) is arranged on the surface of the reclamation soil layer (2);
the mine tailing piling area (4) at the middle and rear part of the reservoir area is internally filled with a backfill soil layer (5), and a drainage system (6) is arranged in the backfill soil layer (5); a reinforcing layer (7) covers the backfill soil layer (5);
the partition ridges (8) are built between the front tailing accumulation area (1) of the dam and the middle and rear tailing accumulation area (4) of the reservoir area; and a plurality of slurry conveying devices (9) are fixedly installed on the partition earth ridges (8), and the slurry conveying devices (9) extend to the tailing accumulation area (4) at the middle rear part of the reservoir area.
2. The device for closed tailing pond sealing according to claim 1, is characterized in that: the cross section of the partition ridge (8) is trapezoidal, the top end of the partition ridge (8) is flush with the reclamation soil layer (2), the width of the bottom surface of the partition ridge (8) is 2m-4m, and the width of the top surface of the partition ridge (8) is 1m-3 m.
3. The device for closed tailing pond sealing according to claim 1, is characterized in that: the reclamation soil layer (2) comprises a clay anti-seepage blocking layer (10) and a near-surface loam reclamation layer (11) which are sequentially arranged from bottom to top; the thickness of the clay anti-seepage barrier layer (10) is 30cm-50cm, and the thickness of the near-surface loam reclamation layer (11) is 30cm-50 cm.
4. The device for closed tailing pond sealing according to claim 3, is characterized in that: the clay seepage-proofing blocking layer (10) and the near-surface loam reclamation layer (11) are obliquely arranged towards the partitioned ridge (8), and the inclination is 1-3%.
5. The device for closed tailing pond sealing according to claim 1, is characterized in that: the backfill soil layer (5) comprises a clay backfill foundation layer (12), a loam backfill reclamation layer (13) and a loam backfill greening layer (14) which are arranged from bottom to top in sequence; the thickness of the clay backfill base layer (12) is 30cm-50cm, and the thickness of the loam backfill reclamation layer (13) is 30cm-50 cm.
6. The device for closed tailing pond sealing according to claim 5, is characterized in that: drainage system (6) include a plurality of plastics drain bar (15), and are a plurality of the bottom of plastics drain bar (15) is run through clay backfill foundation layer (12) and stretch into district (4) is piled up to rear portion tailing in the reservoir area, the top of plastics drain bar (15) stretches out loam backfill greening layer (14) and the intercommunication has the drainage to be responsible for (16).
7. The device for closed tailing pond sealing according to claim 6, is characterized in that: the reinforcing layer (7) comprises a non-woven geotextile (17), two layers of polyvinyl chloride films (18), a cohesive soil layer (19) and a vacuum sealing film (20) which are arranged from bottom to top in sequence; the non-woven geotextile (17) covers the top end of the main drainage pipe (16).
8. A method for closed tailing pond closing and field sealing of the device according to any one of claims 1 to 7, which is characterized by comprising the following steps:
1) building a partition ridge (8), and dividing a tailing accumulation area (1) in front of a dam and a tailing accumulation area (4) at the middle rear part of a reservoir area;
2) filling a reclamation soil layer (2) until the reclamation soil layer is flush with the top ends of the subarea ridges (8), and laying a grass seed greening layer (3);
3) erecting slurry conveying equipment (9);
4) filling a backfill soil layer (5) to a rear tailing accumulation area (4) in the reservoir area;
5) installing a drainage system (6);
6) paving a reinforcing layer (7), and vacuumizing and reinforcing the reinforcing layer (7) and the backfill soil layer (5);
7) the grass seed greening layer (3) is paved after the surface treatment of the reinforcing layer (7).
9. The method for closed tailing pond sealing according to claim 8, characterized by comprising the following steps: and 4), arranging the buoys (21) in the process of pumping the backfill soil layer (5) by the slurry conveying system, and supporting the slurry conveying equipment (9) and providing the application workers for walking.
10. The method for closed tailing pond sealing according to claim 8, characterized by comprising the following steps: in the step 6), the pressure of vacuum reinforcement is 80 kPa-85 kPa.
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| CN115492131A (en) * | 2022-08-23 | 2022-12-20 | 攀钢集团矿业有限公司 | Embankment type soil covering method and device for tailing pond closed tail weak beach face |
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