CN100494629C - Ribbed terrace method for wet type stack of fine tailings - Google Patents
Ribbed terrace method for wet type stack of fine tailings Download PDFInfo
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- CN100494629C CN100494629C CNB2006100756353A CN200610075635A CN100494629C CN 100494629 C CN100494629 C CN 100494629C CN B2006100756353 A CNB2006100756353 A CN B2006100756353A CN 200610075635 A CN200610075635 A CN 200610075635A CN 100494629 C CN100494629 C CN 100494629C
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Abstract
The invention relates to a reinforced terrace method used in granule gangue wet accumulation. First, layering the earthwork composite material as earthwork grid in a certain area of dam and dry beach; then according to the demand of flood prevention, building some small accumulations to form the terrace; therefore, the gangue and the earthwork composite material forms a composite soil structure, to strengthen the stability of gangue bam and improve the gradient of dry beach.
Description
Technical field
The invention belongs to mine mining field, relate to a kind of mine wet type stack of fine tailings method.
Background technology
Mine tailing is a kind of ore deposit quarrel, and it is discharged with pulpous state form (wet type), is stored in the mine tailing storehouse.Only the mine tailing that dumps every year of China is nearly 300,000,000 tons.In these mine tailings, fine tailings has accounted for 1/3rd, and along with fast development and the progress of technique of preparing and the comprehensive utilization of mine tailing of mining industry, the fine tailings proportion also can improve constantly.Because the not only physico-mechanical properties of fine tailings own is poorer than the mine tailing of general big particle diameter, and the dried beach face gradient that forms in banking process is more slow, can't satisfy reservoir area flood control requirement, there is serious potential safety hazard.And can the stability of tailing dam not only relate to the mine tailing storehouse and normally use, and can have influence on downstream area resident's security of the lives and property and environmental problem.In the mine, because the tailing dam engineering lost efficacy, cause the example of serious harm of common occurrence at home and abroad, as on October 18th, 2000, the dam accident was striden in Nandan County great plan mill tailings storehouse, China Guangxi, causes tens of people's death, and direct economic loss reaches 3,400,000 yuan.In addition; effectively utilize the increasing that requires to improve constantly with the environmental protection dynamics along with the soil; and from the mine self sustainable development aspect is considered; bargh urgently wishes to resolve the accumulation problem of fine tailings; promptly how to take effective method; when improving mine tailing accumulation height of dam degree, enlarging storage capacity, guarantee the stability on fine tailings dam.
At present, general mine adopts the pond method of filling out to handle fine tailings, and shown in Fig. 1-2, heap is filled out fine tailings between dam 1 and the tail water storehouse 8 in the early stage, and the operation that method is filled out in the pond is:
(1) Xiao Chi of the several squarish of branch on the section of building a dam of a fine tailings, the length of side in pond is about 30-50 meters;
(2) build with artificial or machinery and enclose little low bank between fields 6, the height of little low bank between fields 6 is that 0.5-1.0 meters, top width are that 0.5-0.8 meter, side slope are about 1: 1;
(3) install bleed off pipe, the overflow mouth of pipe can be located at the center or the close inboard on sub-dam 4 and enclose Nian Chu;
(4) adopt the dispersion ore drawing to utilize ore drawing pipe 5 to fill out to the pond Nei Chong that little low bank between fields 6 surrounds, coarse grain deposits in the pond, and particulate is discharged in the tail water storehouse 8 by bleed off pipe with water.When dashing when being filled to little low bank between fields 6 tops, stop ore drawing, dry a period of time forms dried beach face 7, builds and encloses low bank between fields, repeats above-mentioned operation until meeting the requirements of sub-dam 4 height.
Adopt this pond to fill out method, the stability that fine tailings is built a dam plays certain improvement effect, but can't pile up higher dam, and the high dam of piling up at present only has 20 meters, and application example seldom.Analyzing the basic reason that these methods can not pile up than high dam is: when adopting this method, the mechanical property of fine tailings soil does not change, and the operation of this method is more loaded down with trivial details, and what have will realize by cyclone.
Summary of the invention
At the big deficiency of prior art, purpose of the present invention just provides a kind of mine tailing that can either improve and piles up the height of dam degree and enlarge ribbed terrace method in the wet type stack of fine tailings of stability that storage capacity can guarantee the fine tailings dam again.
For achieving the above object, the ribbed terrace method in a kind of wet type stack of fine tailings of the present invention is specially:
(1) according to behind total mine tailing amount selection mine tailing dam site, determines the overall height of mine tailing dam body and the scale of initial dam;
(2) after initial dam is built up, adopt between dam and the tail water storehouse in the early stage to disperse to dash between ore drawing normal direction initial dam and the tail water storehouse and fill out fine tailings, form the mine tailing alluvial dam;
(3) when the stability of the dam body of mine tailing alluvial dam is lower than code requirement, on the dried beach face of mine tailing alluvial dam, lay one deck geosynthetics;
(4) one side of the initial dam on the geosynthetics of mine tailing alluvial dam is established packway, drainage direction in the axis normal of packway and the fine tailings, build Zi Ba at packway towards tail water storehouse direction one side, the axis on sub-dam is parallel with the axis of packway, and the height on sub-dam is that 2-5 meters, width are that 3-5 meters, the gradient are 1:2.75;
(5) at the upper surface of geosynthetics, heap is built the little low bank between fields of plurality of rows perpendicular to drainage direction in the fine tailings, has spacing between the little low bank between fields of every row, and along the direction of initial dam to the tail water storehouse, the height of little low bank between fields reduces gradually, forms the terrace-type structure; Along the direction of initial dam to the tail water storehouse, the height of little low bank between fields is decremented to 0.5 meter gradually from 1.0 meters, and top width is decremented to 0.5 meter from 0.8 meter, and side slope is 1: 1;
(6) along the direction of initial dam to the tail water storehouse, adopt to disperse to dash in the ore drawing normal direction terraced fields and fill out fine tailings, coarse grain in the fine tailings deposits in terraced fields, particulate dashes step by step and fills up terraced fields to the tail water storehouse with the excessive too small low bank between fields row of water row behind adjacent terraced fields, forms the dried beach face of certain slope;
(7) repeating step (3)-(6) are until the overall height that reaches the mine tailing dam body.
Further, described little low bank between fields is to utilize the woven bag heap that fine tailings is housed to build.
Further, the stability of the dam body of described mine tailing alluvial dam calculates according to Swedish slice.
Further, along the direction of initial dam to the tail water storehouse, the total length of the geosynthetics of laying on described every layer of dried beach face be every geosynthetics extend length beyond the slip circle and its at slip circle with interior length sum.
Compared with prior art, the present invention organically is applied to geosynthetics in bargh's wet type stack of fine tailings process, forms reinforced earth, improves the mechanical property of fine tailings, strengthen the stability of fine tailings fill dam, improve the height of fine tailings fill dam; Simultaneously, the parallel axis of dam is provided with several rows of little low bank between fields of building by laying bricks or stones with the braiding packeted soil on dried beach face, forms the terrace-type structure, to improve the gradient of dried beach face, satisfy reservoir area flood control requirement, adopt method of the present invention to handle fine tailings, not only construction is simple but also cost is lower.
Description of drawings
The sectional schematic diagram that Fig. 1 builds a dam for the pond method of filling out in the prior art;
Fig. 2 is the sectional drawing of Fig. 1;
The floor map that Fig. 3 builds a dam for ribbed terrace method of the present invention;
Fig. 4 is the sectional schematic diagram of Fig. 3;
The schematic diagram of the Calculation on stability that Fig. 5 builds a dam for ribbed terrace method;
Fig. 6 is the local pressure analysis chart among Fig. 5.
The specific embodiment
Ribbed terrace method in the wet type stack of fine tailings of the present invention, be that geosynthetics is applied in the wet type stack of fine tailings, geosynthetics can change the mechanical property of the soil body, therefore, geosynthetics is applied in the wet type stack of fine tailings, can strengthens the stability of dam body.Simultaneously, several rows of little low bank between fields of building by laying bricks or stones with the braiding packeted soil is set on dried beach face, the drainage direction of little low bank between fields and fine tailings is perpendicular, and along drainage direction, the height of the little low bank between fields of every row forms the terrace-type structure, to improve the dried beach face gradient, satisfies reservoir area flood control requirement.Efficiently and effectively solves the difficult problem that bargh disposes fine tailings.This method when increasing the dam body piling height, has guaranteed the stability of dam body with organic being applied to of geosynthetics in the dam body that fine tailings piles up, has improved the gradient of dried beach face.
Among Fig. 3-4, the ribbed terrace method operation is:
(1) according to behind total mine tailing amount selection mine tailing dam site, determines the overall height of mine tailing dam body and the scale of initial dam 1; On mine tailing alluviation dam body, laying one deck geosynthetics 3 by the designing and calculating requirement is geo-grid;
(2) after initial dam 1 is built up, adopt between dam 1 and the tail water storehouse 8 in the early stage to disperse to dash between ore drawing normal direction initial dam 1 and the tail water storehouse 8 and fill out fine tailings, form the mine tailing alluvial dam;
(3) when the stability of the dam body of mine tailing alluvial dam is lower than code requirement, on the dried beach face 7 of mine tailing alluvial dam, lay one deck geosynthetics 3;
(4) initial dam 1 one sides on the geosynthetics 3 of mine tailing alluvial dam are established packway 2, drainage direction in the axis normal of packway 2 and the fine tailings, packway 2 towards the tail water storehouse 8 directions, one side build sub-dam 4, the axis on sub-dam 4 is parallel with the axis of packway 2, and the height on sub-dam 4 is that 2-5 meters, width are that 3-5 meters, the gradient are 1:2.75;
(5) on geosynthetics 3, heap is built the little low bank between fields 6 of plurality of rows perpendicular to drainage direction in the fine tailings, has spacing between the little low bank between fields 6 of every row, and along the direction of initial dam 1 to tail water storehouse 8, the height of little low bank between fields 6 reduces gradually, forms the terrace-type structure; Along the direction of initial dam 1 to tail water storehouse 8, the height of little low bank between fields 6 is decremented to 0.5 meter gradually from 1.0 meters, and top width is decremented to 0.5 meter from 0.8 meter, and side slope is 1: 1;
(6) along the direction of initial dam 1 to tail water storehouse 8, adopt to disperse to dash in the ore drawing normal direction terraced fields and fill out fine tailings, coarse grain in the fine tailings deposits in terraced fields, particulate dashes step by step and fills up terraced fields to tail water storehouse 8 with excessive too small low bank between fields 6 rows of water row behind adjacent terraced fields, forms dried beach face 7;
(7) repeating step (3)-(6) are until the overall height that reaches the mine tailing dam body.
Wherein, little low bank between fields 6 is to utilize the woven bag heap that fine tailings is housed to build.The height on sub-dam 4, width and the gradient all are to set according to present experience and code requirement, generally highly are that 2-5 meters, width are that 3-5 meters, the gradient are 1:2.75.The stability of dam body calculates according to Swedish slice, requires dam body is reinforced according to " ore dressing field mine tailing facilities design standard " ZBJ1-90 then, to strengthen its stability.
Shown in Fig. 5-6, in order to calculate dam stability, to get the principal section of dam body, and be divided into some virtual sticks, the use Swedish slice obtains the stability of dam body, after the effect of considering seismic forces, the coefficient of stability K of dam body
sFor:
In the formula, W
i--i soil bar weight;
θ
i--the elevation angle of arc at the bottom of the i soil bar;
Δ L
i--arc length at the bottom of the i soil bar;
R--is the radius of dangerous slip circle;
T
Ai--the tensile strength of i layer geosynthetics;
y
i--i layer geosynthetics is apart from the distance in the slip circle center of circle;
C
s--seismic coefficient;
The adhesion stress that the c--side slope is banketed;
--the angle of internal friction that side slope is banketed;
The native bar sum that n--divides;
The total number of plies of reinforcement material that m--arranges.
Wherein, the soil of indication is fine tailings in the design formulas, and native bar is the stick of the fine tailings formation of virtual division, and muscle is geosynthetics.
In the formula, reinforced action power T
AiEqual reinforcement soil block weight and muscle band and the friction factor of soil and reinforced bands length three's product, that is:
In the formula, L
a--powered phase length, promptly at slip circle with interior length;
W
Vi--act on the overburden pressure on certain layers of reinforcement material;
Geological process power F
iSize equal the weight of stick and the product of seismic coefficient, that is:
F
i＝C
sW
i
In addition, the design formulas of the total length L of the geosynthetics of laying on every layer of dried beach face is:
L＝L
a+L
p，
In the formula, L
a--the powered phase length of geosynthetics, promptly at slip circle with interior length;
L
p--geosynthetics extends the length beyond the slip circle;
T
a--geosynthetics allow tensile strength;
K
f--the resistance to plucking safety factor of requirement.
Geosynthetics extends the length L beyond the slip circle
p, sufficient uplift resistance can be provided, prevent that geosynthetics is pulled out.
Claims (4)
1, the ribbed terrace method in a kind of wet type stack of fine tailings is specially:
(1) according to behind total mine tailing amount selection mine tailing dam site, determines the overall height of mine tailing dam body and the scale of initial dam;
(2) after initial dam is built up, adopt between dam and the tail water storehouse in the early stage to disperse to dash between ore drawing normal direction initial dam and the tail water storehouse and fill out fine tailings, form the mine tailing alluvial dam;
(3) when the stability of the dam body of mine tailing alluvial dam is lower than code requirement, on the dried beach face of mine tailing alluvial dam, lay one deck geosynthetics;
(4) one side of the initial dam on the geosynthetics of mine tailing alluvial dam is established packway, drainage direction in the axis normal of packway and the fine tailings, build Zi Ba at packway towards tail water storehouse direction one side, the axis on sub-dam is parallel with the axis of packway, and the height on sub-dam is that 2-5 meters, width are that 3-5 meters, the gradient are 1:2.75;
(5) at the upper surface of geosynthetics, heap is built the little low bank between fields of plurality of rows perpendicular to drainage direction in the fine tailings, has spacing between the little low bank between fields of every row, and along the direction of initial dam to the tail water storehouse, the height of little low bank between fields reduces gradually, forms the terrace-type structure; Along the direction of initial dam to the tail water storehouse, the height of little low bank between fields is decremented to 0.5 meter gradually from 1.0 meters, and top width is decremented to 0.5 meter from 0.8 meter, and side slope is 1:1;
(6) along the direction of initial dam to the tail water storehouse, adopt to disperse to dash in the ore drawing normal direction terraced fields and fill out fine tailings, coarse grain in the fine tailings deposits in terraced fields, particulate dashes step by step and fills up terraced fields to the tail water storehouse with the excessive too small low bank between fields row of water row behind adjacent terraced fields, forms dried beach face;
(7) repeating step (3)-(6) are until the overall height that reaches the mine tailing dam body.
2, the ribbed terrace method in the wet type stack of fine tailings according to claim 1 is characterized in that, described little low bank between fields is to utilize the woven bag heap that fine tailings is housed to build.
3, the ribbed terrace method in the wet type stack of fine tailings according to claim 1 is characterized in that, the stability of the dam body of described mine tailing alluvial dam calculates according to Swedish slice.
4, the ribbed terrace method in the wet type stack of fine tailings according to claim 1, it is characterized in that, along the direction of initial dam to the tail water storehouse, the total length of the geosynthetics of laying on described every layer of dried beach face be every geosynthetics extend length beyond the slip circle and its at slip circle with interior length sum.
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| CNB2006100756353A CN100494629C (en) | 2006-04-17 | 2006-04-17 | Ribbed terrace method for wet type stack of fine tailings |
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| CNB2006100756353A CN100494629C (en) | 2006-04-17 | 2006-04-17 | Ribbed terrace method for wet type stack of fine tailings |
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| CN100494629C true CN100494629C (en) | 2009-06-03 |
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| CN107447743A (en) * | 2017-09-20 | 2017-12-08 | 鞍钢集团矿业有限公司 | Combined type ore drawing Ikeda and ore drawing method with overflow pipe |
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| CN108584453B (en) * | 2018-04-27 | 2019-11-05 | 洛阳理工学院 | A kind of tails dry stacked arrangement suitable for mountain valley area |
| CN108842724B (en) * | 2018-06-13 | 2019-05-21 | 国家安全生产监督管理总局信息研究院 | A kind of fine tailings and high concentration do not sort the quick damming method of tailing |
| CN113981992B (en) * | 2021-10-21 | 2022-04-22 | 应急管理部信息研究院 | Method for rapidly piling fine-grained tailings by using improved pond filling method |
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Patent Citations (4)
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| SU1731952A1 (en) * | 1989-06-14 | 1992-05-07 | Институт Физики И Механики Горных Пород Ан Киргсср | Method of rock selective storage |
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