CN104711953A - Tailing dam built through barren rock - Google Patents
Tailing dam built through barren rock Download PDFInfo
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- CN104711953A CN104711953A CN201510068812.4A CN201510068812A CN104711953A CN 104711953 A CN104711953 A CN 104711953A CN 201510068812 A CN201510068812 A CN 201510068812A CN 104711953 A CN104711953 A CN 104711953A
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Abstract
The invention relates to a tailing dam built through barren rock. The tailing dam comprises a primary dam body and a manmade loess dry beach, and is provided with an outer slope and an inner slope. The tailing dam is characterized in that according to constitute materials and requirements of all parts, in the primary dam body I, the barren stock in a stope is adopted as materials, the content of the barren rock with the particle size not larger than 2 mm is smaller than or equal to 10 percent, the particle size distribution in rock-disposal site is smaller than or equal to 1.4 m, the softening coefficient of the barren rock is larger than or equal to 0.8, the porosity of a body of the primary dam body is smaller than or equal to 30 percent, the inner friction angle of the body of the primary dam body is larger than or equal to 35 degrees, protection layers are arranged on the outer slope and dam top of the primary dam body, the protection layer of the outer slope comprises a loess layer, a reinforced geotextile layer and a sand gravel cushion layer from outside to inside in sequence, and the protection layer of the dam top comprises a dam top loess layer, a first sand gravel cushion layer, a dam top reinforced geotextile layer and a second sand gravel cushion layer from top to bottom in sequence; in the manmade loess dry beach II, the thickness of the manmade loess dry beach is not smaller than 0.7 m. Sub-dams can be built at the initial stage. The tailing dam built through the barren rock is high in safety, simple in building process, short in dam building period and high in efficiency.
Description
Technical field
The present invention relates to a kind of tailing dam, specifically, relate to the tailing dam that a kind of barren rock is built.
Background technology
Tailings Dam can take two kinds of modes of building a dam, and one more than dam adopts " upper reaches method " to carry out heap with mine tailing in the early stage to build, but prerequisite is CHARACTERISTICS OF TAILINGS SAND grade must meet the demands, and another kind of method is with the barren rock of mining stripping or gets stone on the spot and build a dam.According to domestic fine fraction Tailing dam construction test and fine-graded Tailing dam construction engineering practice, roughly meet all genus fine fraction mine tailing of one of following condition.The grade that CHARACTERISTICS OF TAILINGS SAND builds a dam can not be used for be divided into:
Mine tailing average grain diameter d
p<30 μm;
-19 μm of content are many, general >50%;
+ 74 μm of content are few, general <10%;
Can be used for particle diameter+37 μm of content≤30% of building a dam.
In Yuan Jia village of mining industry Co., Ltd, the Lanxian County iron ore beneficiation technique of applicant, the content of grinding particle size+74 μm is not more than 8%, mine tailing granularity is very thin, mine tailing sizing assay test the results are shown in Table 1, can not be directly used in and build a dam, and can only build tailing dam with barren rock, the tailing dam that existing barren rock is built is as Anshan iron and steel plant Dagushan Iron Ore Mine tailing dam, technique of building a dam need adopt layered rolling, and cause operation of building a dam many, efficiency of building a dam is low; Configuration aspects adopts independent Tailings Dam, and Yuan Jia village iron ore carries out the mine tailing displacement requirements that can not meet 2,200 ten thousand t/a scale ore dressing plants like this.The resistance to overturning of tailing dam, stability against sliding, stability against overturning and distortional stress are poor, unstable.
Table 1
Summary of the invention
In order to overcome the above-mentioned deficiency of the tailing dam that existing barren rock is built, the invention provides that a kind of safety is high, the tailing dam built with barren rock of stable operation, the resistance to overturning of this tailing dam, stability against sliding, stability against overturning and distortional stress and osmotic stability, reach its corresponding standard-required, and technique of building a dam is simple, efficiency of building a dam is high.
This with the tailing dam that barren rock is built comprise initial dam, artificial loess does beach, initial dam has dam crest, the width of dam crest is generally 10m ~ 11m, the height of tailing dam is generally not less than 50m, tailing dam has outer slope and inner slope, the gradient on the outer slope of tailing dam is generally 1:(2 ~ 2.2), the gradient of inner slope is generally 1:(2.2 ~ 2.4), it is characterized in that the constituent material of each several part and requirement are respectively:
(1) initial dam
Material is stope barren rock, and wherein particle diameter is not more than barren rock content≤10% of 2mm, barren rock lumpiness≤1.4m, barren rock coefficient of softening >=0.8, porosity≤30% of initial dam main body, angle of internal friction >=35 ° of initial dam main body.
The outer slope on dam and dam crest matcoveredn in the early stage, outer slope topping is followed successively by loess formation, reinforced earth layer of cloth (loaded filter material) and sand-gravel cushion from outside to inside.
Effect is better in the requsst listed below for loess formation, reinforced earth layer of cloth and sand-gravel cushion; The thickness of loess formation is 2000mm ~ 2200mm, Loess Compacting degree >=91%, and every square metre of reinforced earth layer of cloth is 500g ~ 550g, and the thickness of sand-gravel cushion (nonuniformity coefficient of grain size of gravel is not more than 50) is 300 mm ~ 330mm; Thickness is with the direction calculating perpendicular to outer slope;
Dam crest topping is followed successively by dam crest loess formation, the first sand-gravel cushion, dam crest reinforced earth layer of cloth and the second sand-gravel cushion from top to bottom.
Dam crest loess formation, the first sand-gravel cushion, dam crest reinforced earth layer of cloth and the second sand-gravel cushion are better by following requirement effect;
The thickness of dam crest loess formation is 2000mm ~ 2200mm, Loess Compacting degree >=91%, and the thickness of the first sand-gravel cushion is 500mm ~ 550mm, and every square metre of dam crest reinforced earth layer of cloth is 500g ~ 550g, and the thickness of the second sand-gravel cushion is 300mm ~ 330mm.
Hot melt adhesion between reinforced earth layer of cloth.
(2) artificial loess does beach
The thickness that artificial loess does beach is 0.7m ~ 2.0m, and length is 40m ~ 50 m, and transmission coefficient is less than 6.05 × 10
-2cm/s, (5.5 ~ 6.05) × 10
-2cm/s is better, and do beach in order to ensure artificial loess and play anti-seepage effect, artificial loess does the advanced water surface elevation>=4m in beach.
As time goes on, in order to adapt to the needs of mine tailing discharge capacity, increase the storage capacity utilization factor of Tailings Dam, also build at the inner slope of the initial dam of the above-mentioned tailing dam built with barren rock and build N number of sub-dam and late dam, N is minimum is 1, the safety platform width >=50m on every sub-dam, and outside sub-dam gradient 1:(2 ~ 2.2 on slope), gradient 1:(2.2 ~ 2.4 of sub-dam inner slope (one side towards downstream)), every sub-dam crest is done beach apart from artificial loess and is risen poor≤30m; The height of first sub-dam crest is greater than the height of initial dam, and the distance at the bottom of the outer slope on first sub-dam and between the dam crest of initial dam and outer slope intersecting lens is not less than 1 m (i.e. the first sub-dam Wai Po the top, outer slope minimum range in the horizontal direction with initial dam bottom; The height on N number of sub-dam is greater than the height on N-1 sub-dam (as N-1=0,0th sub-dam and s.m.p dam just refer to initial dam), the distance at the bottom of the outer slope on N number of sub-dam and between the dam crest on N-1 sub-dam and (N-1 sub-dam) outer slope intersecting lens is not less than 1 m (i.e. N number of sub-dam Wai Po the top, slope minimum range in the horizontal direction outside individual sub-dam with N-1 bottom); The material used material used with initial dam in sub-dam is identical, and technical requirements is as follows:
Material is stope barren rock, and wherein particle diameter is not more than barren rock content≤10% of 2mm, barren rock lumpiness≤1.4m, barren rock coefficient of softening >=0.8, porosity≤35% of sub-dam (late dam) main body.
At outer slope and the dam crest matcoveredn on sub-dam, outside sub-dam, slope topping is followed successively by sub-dam loess formation, sub-dam reinforced earth layer of cloth (loaded filter material) and sub-dam sand-gravel cushion from outside to inside; The thickness of sub-dam loess formation is 2000mm ~ 2200mm, Loess Compacting degree >=91%, every square metre of sub-dam reinforced earth layer of cloth is 500g ~ 550g, hot melt adhesion between sub-dam reinforced earth layer of cloth, the thickness of sub-dam sand-gravel cushion (nonuniformity coefficient of grain size of gravel is not more than 50) is 300mm ~ 330mm.
Sub-dam crest topping is followed successively by sub-dam crest loess formation, sub-dam crest first sand-gravel cushion, sub-dam crest reinforced earth layer of cloth and sub-dam crest second sand-gravel cushion from top to bottom; The thickness of sub-dam crest loess formation is 2000mm ~ 2200mm, Loess Compacting degree >=91%, the thickness of sub-dam crest first sand-gravel cushion is 500mm ~ 550mm, and every square metre of sub-dam crest reinforced earth layer of cloth is 500g ~ 550g, and the thickness of sub-dam crest second sand-gravel cushion is 300mm ~ 330mm.Hot melt adhesion between sub-dam crest reinforced earth layer of cloth.
Further, the first sub-dam crest is higher than the dam crest 2000mm ~ 2200mm of initial dam, and at the bottom of the outer slope on first sub-dam, the distance dam, top of initial dam is 500mm ~ 550mm with the distance of (initial dam) outer slope intersecting lens; When N-1 >=1, at the bottom of the outer slope on N number of sub-dam, the dam, top on distance N-1 sub-dam is 500mm ~ 550mm with the distance of (N-1 sub-dam) outer slope intersecting lens; When N-1 >=1, and when N is less than 10, N number of sub-dam crest is higher than N-1 sub-dam crest 20m, general ~ 22m; When N is more than or equal to 10, N number of sub-dam crest higher than N-1 sub-dam crest 10 m, generally higher than 10m ~ 11m.
beneficial effect of the present invention
(1) solve Tailings Dam to build a dam problem, coordinate ore dressing normally to produce.
(2) technique of building a dam of the tailing dam built of barren rock owing to adopting is simple; and Tailings Dam combines with refuse dump; operation of building a dam is less; be suitable for adopting the method for dam disperseing ore drawing, before dam, form mine tailing deposition beach face, protection barren rock dam slope face prevents barren rock dam from directly contacting with the water surface; efficiency of building a dam is high; adopt stope barren rock to advance building tailing dam by installments to downstream, the cooperation mine tailing rate of climb, meet the mine tailing discharge capacity demand in 2,200 ten thousand t/a scale ore dressing plants.
(3) reliability assessment result reach that mechanics is stable, seepage stability, the requirement of distortional stress stability criterion; For longitudinal section be: the compound large-scale hydraulic association of " aqueous phase-saturated tailings-artificial dry beach-geotextiles-barren rock dam body-back-pressure backfill body ", employing Finite Element, finite difference method and limit equilibrium state have made two dimension and three dimensional analysis, study its mechanical stability (resistance to overturning, stability against sliding, stability against overturning), osmotic stability, distortional stress stability, by the optimization of aqueous phase-slurry-liquid process index, achieve the safety of Tailings Dam, stable operation.
A, mechanical stability
By meeting mechanical stability standard-required to the result of calculation of three, barren rock dam body left, center, right section (present situation, artificial dry beach+back-pressure backfill) integral dam safety factor, anti-sliding stability coefficient and stability against overturning coefficient under normal operation, flood operation and earthquake operation condition.
B, osmotic stability
By to three, barren rock dam body left, center, right section under natural operating mode (present situation, the backfill of artificial dry beach+back-pressure) carry out seepage flow stability computation, Computed-torque control comprises phreatic line buried depth, effusion trend, seepage discharge and piping trend, and result of calculation statistics meets analysis of seepage flow stability standard-required.
C, distortional stress stability
By carrying out two dimension, special hybrid stress element to three, barren rock dam body left, center, right section, draw the following conclusions: maximum displacement is positioned at toe place, dam body downstream, be about 0.7m, the displacement of earthquake operating mode is greater than other two kinds of operating modes, and the displacement of accidental conditions is minimum; The plastic zone that two dimensional model calculates mainly is distributed in dam crest and downstream toe, but not yet in breakthrough status, the Plastic Zone Distribution of earthquake operating mode is widest in area, and the Plastic Zone Distribution scope of accidental conditions is minimum.The plasticity distribution that threedimensional model calculates is less than the result of two dimensional model gained, and its plastic zone is only present in downstream toe on a small quantity, and to sum up from Dam body displacement field and plasticity distributed area distribution characteristics angle, dam body is stable.
Accompanying drawing explanation
Fig. 1 is the horizontal section schematic diagram of embodiments of the invention one.
Fig. 2 is the close-up schematic view of outer slope topping.
Fig. 3 is the close-up schematic view of dam crest topping.
Fig. 4 is the partial lateral generalized section of embodiments of the invention two.
In above-mentioned Fig. 1,2 and 3:
1-ground (initial dam: the collapsible loess removing 7 regions, full dam foundation top layer desurfacing 0.5m; Late dam: piling prepressing is in advance carried out to dam foundation collapsible loess region, desurfacing 0.5m when dam abutment fills), 2-artificial dry beach, 3-initial dam, 4-initial dam main body, 5-outer slope topping, 6-outer slope (upstream dam slope), 7-dam crest, 8-dam crest topping, 9-inner slope, 10-outer slope loess formation, 11-outer slope reinforced earth layer of cloth, 12-outer slope sand-gravel cushion, 13-stone, 14-dam crest loess formation, 15-dam crest first sand-gravel cushion, 16-dam crest reinforced earth layer of cloth, 17-dam crest second sand-gravel cushion;
In above-mentioned Fig. 4:
18-the first sub-dam, slope topping outside 19-the first sub-dam, 20-the first sub-dam Wai Po, 21-the first sub-dam crest, 22-the first sub-dam crest topping, slope loess formation outside 23-the first sub-dam, 24-the first reinforced earth layer of cloth of slope outside sub-dam, slope sand-gravel cushion outside 25-the first sub-dam, 26-the first sub-dam crest loess formation, 27-the first sub-dam crest first sand-gravel cushion, 28-the first sub-dam crest reinforced earth layer of cloth, 29-the first sub-dam crest second sand-gravel cushion, 30-the first sub-dam inner slope, 31-the second sub-dam, slope topping outside 32-the second sub-dam, 33-the second sub-dam Wai Po, 34-the second sub-dam crest, 35-the second sub-dam crest topping, slope loess formation outside 36-the second sub-dam, 37-the second reinforced earth layer of cloth of slope outside sub-dam, slope sand-gravel cushion outside 38-the second sub-dam, 39-the second sub-dam crest loess formation, 40-the second sub-dam crest first sand-gravel cushion, 41-the second sub-dam crest reinforced earth layer of cloth, 42-the second sub-dam crest second sand-gravel cushion, 43-the second sub-dam inner slope, 44-the first boundary line, 45-the second boundary line.
Detailed description of the invention
Describe bright the specific embodiment of the present invention in detail below in conjunction with embodiment and accompanying drawing thereof, but the detailed description of the invention of not inventing is not limited to following embodiment.
embodiment one
Embodiment one see Fig. 1, Fig. 2 and Fig. 3 with the tailing dam that barren rock is built, it comprises initial dam 3 and artificial loess does beach 2, the width of dam crest 7 is 10m, the height of initial dam 3 is 65 m, the gradient on the outer slope 6 of initial dam 3 is 1:2, the gradient 1:2.2 of inner slope 9, is characterized in that the constituent material of each several part and requirement are respectively:
Initial dam 3
Material is stope barren rock, and wherein particle diameter is not more than barren rock content≤10% of 2mm, barren rock lumpiness≤1.4m, barren rock coefficient of softening >=0.8, porosity≤30% of initial dam main body, and the angle of internal friction of initial dam main body 4 is more than or equal to 35 °.
There is outer slope topping 5 on the outer slope 6 on dam 3 in the early stage, and dam crest 7 has dam crest topping 8, and outer slope topping 5 is followed successively by outer slope loess formation 10, outer slope reinforced earth layer of cloth 11 (loaded filter material) and outer slope sand-gravel cushion 12 from outside to inside; The thickness of outer slope loess formation 10 is 2000mm, Loess Compacting degree 91%, and every square metre of outer slope reinforced earth layer of cloth 11 is 500g, and the thickness of outer slope sand-gravel cushion 12 is 300 mm.
Dam crest topping 8 is followed successively by dam crest loess formation 14, dam crest first sand-gravel cushion 15, dam crest reinforced earth layer of cloth 16 and dam crest second sand-gravel cushion 17 from top to bottom; The thickness of dam crest loess formation 14 is 2000mm, and Loess Compacting degree is 91%, and the thickness of dam crest first sand-gravel cushion 15 is 500 mm, and every square metre of dam crest reinforced earth layer of cloth 16 is 500g, and the thickness of dam crest second sand-gravel cushion 17 is 300 mm.
The thickness that artificial loess does beach 2 is 1.2m-2.0m, and the length that (ground is uneven) artificial loess does beach 2 is 46m, and the transmission coefficient that artificial loess does beach 2 is 5.5 × 10
-2cm/s.
It is 4.2m that the artificial loess of the present embodiment does the advanced water surface elevation in beach 2.The reinforced earth layer of cloth of the present embodiment be reinforcement terylene nonwoven geotextiles, weight 500g/m
2, between reinforcement terylene nonwoven geotextiles with reinforcement terylene nonwoven geotextiles, adopt hot melting process to be connected.
embodiment two
Embodiment two and the difference of embodiment one to build with dam crest 7 at the inner slope 9 of embodiment one to build late dam i.e. the first sub-dam 18 and the second sub-dam 31, sees Fig. 4.Describe the position relationship of two sub-dams and initial dam in the diagram.First sub-dam 18 is built the inner slope 9 building initial dam 3 in and is built with the sub-dam 31 of dam crest 7, second the first sub-dam inner slope 30 and the first sub-dam crest 21 building the first sub-dam 18 in.Safety platform width and the width at dam crest on every sub-dam are 50m, the gradient 1:2 on the outer slope on sub-dam, the gradient 1:2.2 of inner slope, and every sub-dam crest is done beach 2 apart from artificial loess and risen the artificial loess of poor≤30m(to do beach 2 padded); The height that first sub-dam 18 is highly greater than initial dam 3 is 20m, and the distance outside the first sub-dam between crossing the first boundary line 44 in the dam, top 7 of the end, slope 20 and initial dam 3 and outer slope 6 is 5 m; The height on the second sub-dam 31 is greater than the height 20m on the first sub-dam 18, and the distance between the second intersection 45 that outside the second sub-dam, the end, slope 33 is crossing with slope 20 outside the first sub-dam crest 21 and the first sub-dam is 5 m.
The material used with the dam body on the second sub-dam 31 material used with initial dam 3 in first sub-dam 18 is identical, material therefor and require as follows:
Material is stope barren rock, and wherein particle diameter is not more than barren rock content≤10% of 2mm, barren rock lumpiness≤1.4m, barren rock coefficient of softening >=0.8, porosity≤35% of late dam main body.
Outside the first sub-dam, slope 20 has the sub-dam crest 21 of slope topping 19, first outside the first sub-dam to have the first sub-dam crest topping 22.Outside first sub-dam, slope topping 19 to have outside the first sub-dam outside the sub-dam of slope loess formation 23, first slope sand-gravel cushion 25 outside slope reinforced earth layer of cloth 24 and the first sub-dam.First sub-dam crest topping 22 has the first sub-dam crest loess formation 26, first sub-dam crest first sand-gravel cushion 27, first sub-dam crest reinforced earth layer of cloth 28 and the first sub-dam crest second sand-gravel cushion 29.
Outside the second sub-dam, slope 33 has the sub-dam crest 34 of slope topping 32, second outside the second sub-dam to have the second sub-dam crest topping 35.Outside second sub-dam, slope topping 32 to have outside the second sub-dam outside the sub-dam of slope loess formation 36, first slope sand-gravel cushion 38 outside slope reinforced earth layer of cloth 37 and the second sub-dam.Second sub-dam crest topping 35 has the second sub-dam crest loess formation 39, second sub-dam crest first sand-gravel cushion 40, second sub-dam crest reinforced earth layer of cloth 41 and the second sub-dam crest second sand-gravel cushion 42.
The thickness of the loess formation on the first sub-dam 18 and the second sub-dam 31 is all 2000mm, Loess Compacting degree 91%; Every square metre of reinforced earth layer of cloth is 500g, and the sand-gravel cushion thickness on outer slope is all 300mm, and the first sand-gravel cushion of dam crest is thick is all 500 mm, and the second sand-gravel cushion is thick is all 300 mm.
The detection of above-described embodiment two and result of calculation add up as follows:
A, mechanical stability
As shown in table 2 by the result of calculation statistics reached three, barren rock dam body left, center, right section (present situation, artificial dry beach+back-pressure backfill) integral dam safety factor, anti-sliding stability coefficient and stability against overturning coefficient under normal operation, flood operation and earthquake operation condition.
Table 2
B, osmotic stability
By to three, barren rock dam body left, center, right section under natural operating mode (present situation, the backfill of artificial dry beach+back-pressure) carry out seepage flow stability computation, Computed-torque control comprises phreatic line buried depth, effusion trend, seepage discharge and piping trend, and result of calculation statistics is as shown in table 3.
Table 3
C, distortional stress stability
By carrying out two dimension, special hybrid stress element to three, barren rock dam body left, center, right section, draw the following conclusions: maximum displacement is positioned at toe place, dam body downstream, for 0.7m, the displacement of earthquake operating mode is greater than other two kinds of operating modes, and the displacement of accidental conditions is minimum; The plastic zone that two dimensional model calculates mainly is distributed in dam crest and downstream toe, but not yet in breakthrough status, the Plastic Zone Distribution of earthquake operating mode is widest in area, and the Plastic Zone Distribution scope of accidental conditions is minimum.The plasticity distribution that threedimensional model calculates is less than the result of two dimensional model gained, and its plastic zone is only present in downstream toe on a small quantity, and to sum up from Dam body displacement field and plasticity distributed area distribution characteristics angle, dam body is stable.
Claims (9)
1., with the tailing dam that barren rock is built, it comprises initial dam, artificial loess does beach, and initial dam has dam crest, tailing dam has outer slope and inner slope, it is characterized in that the constituent material of each several part and requirement are respectively:
iinitial dam
Material is stope barren rock, and wherein particle diameter is not more than barren rock content≤10% of 2mm, barren rock lumpiness≤1.4m, barren rock coefficient of softening >=0.8, porosity≤30% of initial dam main body, angle of internal friction >=35 ° of initial dam main body;
The outer slope on dam and dam crest matcoveredn in the early stage, outer slope topping is followed successively by loess formation, reinforced earth layer of cloth and sand-gravel cushion from outside to inside;
Dam crest topping is followed successively by dam crest loess formation, the first sand-gravel cushion, dam crest reinforced earth layer of cloth and the second sand-gravel cushion from top to bottom;
iIartificial loess does beach
The thickness that artificial loess does beach is not less than 0.7m, and length is 40m-50 m, and transmission coefficient is less than 6.05 × 10
-2cm/s.
2. the tailing dam built of barren rock according to claim 1, it is characterized in that: the thickness of the loess formation of described outer slope topping is 2000mm ~ 2200mm, Loess Compacting degree >=91%, every square metre of reinforced earth layer of cloth is 500g ~ 550g, and the thickness of sand-gravel cushion is 300 mm ~ 330mm; The thickness of described dam crest loess formation is 2000mm ~ 2200mm, Loess Compacting degree >=91%, the thickness of the first sand-gravel cushion is 500mm ~ 550mm, and every square metre of dam crest reinforced earth layer of cloth is 500g ~ 550g, and the thickness of the second sand-gravel cushion is 300mm ~ 330mm.
3. the tailing dam built of barren rock according to claim 1 and 2, is characterized in that: described artificial loess does the height >=4m of the advanced water surface in beach.
4. the tailing dam built of barren rock according to claim 1 and 2, it is characterized in that: also build at the inner slope of described initial dam and build N number of sub-dam, N is minimum is 1, safety platform width >=the 50m on every sub-dam, outside sub-dam, the gradient on slope is 1:(2 ~ 2.2), the gradient of sub-dam inner slope is 1:(2.2 ~ 2.4), every sub-dam crest is done beach apart from artificial loess and is risen poor≤30m; The height of first sub-dam crest is higher than the height of initial dam, and the distance at the bottom of the outer slope on first sub-dam and between the dam crest of initial dam and outer slope intersecting lens is not less than 1 m; The height on N number of sub-dam is greater than the height on N-1 sub-dam, and the distance at the bottom of the outer slope on N number of sub-dam and between the dam crest on N-1 sub-dam and outer slope intersecting lens is not less than 1 m;
The material used material used with initial dam in sub-dam is identical, and technical requirements is as follows:
Material is stope barren rock, and wherein particle diameter is not more than barren rock content≤10% of 2mm, barren rock lumpiness≤1.4m, barren rock coefficient of softening >=0.8, porosity≤35% of sub-dam main body;
At outer slope and the dam crest matcoveredn on sub-dam, outside sub-dam, slope topping is followed successively by sub-dam loess formation, sub-dam reinforced earth layer of cloth and sub-dam sand-gravel cushion from outside to inside;
Sub-dam crest topping is followed successively by sub-dam crest loess formation, sub-dam crest first sand-gravel cushion, sub-dam crest reinforced earth layer of cloth and sub-dam crest second sand-gravel cushion from top to bottom.
5. the tailing dam built of barren rock according to claim 4, it is characterized in that: outside described sub-dam, the thickness of the sub-dam loess formation of slope topping is 2000mm ~ 2200mm, Loess Compacting degree >=91%, every square metre of sub-dam reinforced earth layer of cloth is 500g ~ 550g, hot melt adhesion between sub-dam reinforced earth layer of cloth, the thickness of sub-dam sand-gravel cushion is 300mm ~ 330mm; The thickness of described sub-dam crest loess formation is 2000mm ~ 2200mm, Loess Compacting degree >=91%, the thickness of sub-dam crest first sand-gravel cushion is 500mm ~ 550mm, every square metre of sub-dam crest reinforced earth layer of cloth is 500g ~ 550g, and the thickness of sub-dam crest second sand-gravel cushion is 300mm ~ 330mm.
6. the tailing dam built of barren rock according to claim 5, is characterized in that: the first sub-dam crest is higher than the dam crest 2000mm ~ 2200mm of initial dam, and at the bottom of the outer slope on first sub-dam, the distance dam, top of initial dam and the distance of outer slope intersecting lens are 500mm ~ 550mm; When N-1 >=1, at the bottom of the outer slope on N number of sub-dam, distance N-1 dam, top on sub-dam and the distance of outer slope intersecting lens are 500mm ~ 550mm; When N-1 >=1, and when N is less than 10, N number of sub-dam crest is higher than N-1 sub-dam crest 20m ~ 22m; When N >=10, N number of sub-dam crest is higher than N-1 sub-dam crest 10m.
7. the tailing dam built of barren rock according to claim 3, it is characterized in that: also build at the inner slope of described initial dam and build N number of sub-dam, N is minimum is 1, safety platform width >=the 50m on every sub-dam, outside sub-dam, the gradient on slope is 1:(2 ~ 2.2), the gradient of sub-dam inner slope is 1:(2.2 ~ 2.4), every sub-dam crest is done beach apart from artificial loess and is risen poor≤30m; The height of first sub-dam crest is higher than the height of initial dam, and the distance at the bottom of the outer slope on first sub-dam and between the dam crest of initial dam and outer slope intersecting lens is not less than 1 m; The height on N number of sub-dam is higher than the height on N-1 sub-dam, and the distance at the bottom of the outer slope on N number of sub-dam and between the dam crest on N-1 sub-dam and outer slope intersecting lens is not less than 1 m;
The material used material used with initial dam in sub-dam is identical, and technical requirements is as follows:
Material is stope barren rock, and wherein particle diameter is not more than barren rock content≤10% of 2mm, barren rock lumpiness≤1.4m, barren rock coefficient of softening >=0.8, porosity≤35% of sub-dam main body;
At outer slope and the dam crest matcoveredn on sub-dam, outside sub-dam, slope topping is followed successively by sub-dam loess formation, sub-dam reinforced earth layer of cloth and sub-dam sand-gravel cushion from outside to inside;
Sub-dam crest topping is followed successively by sub-dam crest loess formation, sub-dam crest first sand-gravel cushion, sub-dam crest reinforced earth layer of cloth and sub-dam crest second sand-gravel cushion from top to bottom.
8. the tailing dam built of barren rock according to claim 7, it is characterized in that: outside described sub-dam, the thickness of the sub-dam loess formation of slope topping is 2000mm ~ 2200mm, Loess Compacting degree >=91%, every square metre of sub-dam reinforced earth layer of cloth is 500g ~ 550g, hot melt adhesion between sub-dam reinforced earth layer of cloth, the thickness of sub-dam sand-gravel cushion is 300mm ~ 330mm; The thickness of described sub-dam crest loess formation is 2000mm ~ 2200mm, Loess Compacting degree >=91%, the thickness of sub-dam crest first sand-gravel cushion is 500mm ~ 550mm, every square metre of sub-dam crest reinforced earth layer of cloth is 500g ~ 550g, and the thickness of sub-dam crest second sand-gravel cushion is 300mm ~ 330mm.
9. the tailing dam built of barren rock according to claim 8, it is characterized in that: the first sub-dam crest is higher than the dam crest 2000mm ~ 2200mm of initial dam, at the bottom of the outer slope on first sub-dam, the distance dam, top of initial dam and the distance of outer slope intersecting lens are 500mm ~ 550mm; When N-1 >=1, at the bottom of the outer slope on N number of sub-dam, distance N-1 dam, top on sub-dam and the distance of outer slope intersecting lens are 500mm ~ 550mm; When N-1 >=1, and when N is less than 10, N number of sub-dam crest is higher than N-1 sub-dam crest 20m ~ 22m; When N >=10, N number of sub-dam crest is higher than N-1 sub-dam crest 10m.
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