CN104750940A - Dynamic design method for strength of cemented filling body of underground mining stope - Google Patents
Dynamic design method for strength of cemented filling body of underground mining stope Download PDFInfo
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- CN104750940A CN104750940A CN201510166900.8A CN201510166900A CN104750940A CN 104750940 A CN104750940 A CN 104750940A CN 201510166900 A CN201510166900 A CN 201510166900A CN 104750940 A CN104750940 A CN 104750940A
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- 238000005065 mining Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000013461 design Methods 0.000 title abstract description 14
- 239000011435 rock Substances 0.000 claims abstract description 15
- 230000002706 hydrostatic effect Effects 0.000 claims abstract description 8
- 230000006378 damage Effects 0.000 claims abstract description 6
- 230000003993 interaction Effects 0.000 claims abstract description 5
- 238000009933 burial Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 4
- 238000012937 correction Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004836 empirical method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000009856 non-ferrous metallurgy Methods 0.000 description 1
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Abstract
The invention discloses a dynamic design method for strength of a cemented filling body of an underground mining stope, belonging to the mining field of a filling method. The design method comprises the steps: (1) calculating a top stress value and lateral stress values of the filling body of the mining stope by means of a hydrostatic pressure theory according to the buried depth of the mining stope; (2) simplifying a mechanical model for the interaction of the filling body and surrounding rock into a three-dimensional stress problem with the same lateral pressure, wherein the destruction of the filling body of the mining stope complies with a Hoek-Brown experience strength destruction criterion; (3) determining the integrity index of the cemented filling body according to the quality requirements of the to-be-filled mining stope under different conditions to the cemented filling body; (4) contrasting the strength value of the cemented filling body satisfying the requirement of the specified filling quality and the strength value capable of satisfying the independence requirement of the filling body of the mining stope, and taking a maximum between the values. The features are as follows: not only the top stressing condition and the onsite filling quality of the actual mining stope are considered, but also the dimension variation of the mining stope is adapted and the strength value of the cemented filling body is dynamically designed.
Description
Technical field
The present invention relates to cut and fill field, particularly relate to the strength of filling mass design of Large Underground mineral deposit cut and fill.
Background technology
Mining is a Dynamic Evolution, and the force environment of obturation is complicated and changeable, and itself is a non-linear complicated multiphase medium body.Obturation and shoulder bed effects relation are not only relevant, simultaneously also relevant with filling quality to obturation proportioning with the factor such as stope mining rate, mining depth, and therefore strength of filling mass is selected to be a process for Dynamic Matching design.The proportioning of obturation and intensity are saved filling cost and ensures one of Stope safty operation keypoint factor, more particularly requires higher filling mining method to obturation early strength; Determining that, in stope filling body intensity, external Strength of backfill value is about 1-2MPa, and clear stipulaties in domestic nonferrous metallurgy class mine operation specification, upper more than the 5.0MPa of strength of filling mass palpus of downward filling method; For strength of filling mass value selected of other various filling mining methods, strength of filling mass 4-5MPa (Jinchuan Nickel Mine selects 4.5MPa) is empirically recommended usually by designing institute and related scientific research unit, thus cause the intensity of domestic obturation usually high than the intensity level chosen abroad, directly cause domestic filling in mine cost high, go back accurate, the suitable method for designing of neither one at present to determine stope filling body intensity.
Triaxial stress state often studied personnel's ignorance of obturation, thinks that obturation itself need only meet independence, this meeting influence research obturation and shoulder bed effects relation, thus affects the selection of strength of filling mass.Thus, many-sided to obturation and shoulder bed effects properties influence according to the deposit mining degree of depth, mining rate and filling quality etc., it is the identical stressed problem of three-dimensional of side pressure by obturation and the model simplification of country rock interaction mechanics, design the dynamic defining method of strength of filling mass under different mining intensity, mining depth condition, be intended to rationally instruct and foundation for mining design provides.
Summary of the invention
The object of this invention is to provide a kind of method for designing of underground mining stope cemented fill dynamic changes of strength.The method can according to conditions such as the deposit mining degree of depth, mining rate and filling qualities, it is the identical stressed problem of three-dimensional of side pressure by obturation and the model simplification of country rock interaction mechanics, dynamic design is carried out to the intensity of stope cemented fill, and the intensity of the cemented fill designed can meet obturation three received strength condition, can maintain self stability again.
A kind of underground mining stope cemented fill dynamic changes of strength method for designing, is characterized in that, comprise the following steps:
(1) according to stope depth of burial, stope filling body top stress value and lateral force value is gone out by hydrostatic force theory calculate;
Described method for designing to as if random, obturation top and lateral force value can be calculated according to the actual depth of burial of any stope, theoretical according to hydrostatic force, calculate stope edge stress state by following formula,
Obturation top force bearing formulae:
σ
v＝γH (1)
In formula (1), γ is the density of Overlying Strata In A Face;
H is the depth of burial of stope;
Obturation lateral force formula:
In formula (2), λ is structure coefficient, usually gets 1.1 ~ 1.3;
Wherein, in described formula (2), with
ratio as the correction factor of obturation lateral force;
(2) be the identical stressed problem of three-dimensional of side pressure by obturation and the model simplification of country rock interaction mechanics, the destruction of stope filling body follows Hoek-Brown experience Strength Criterion for Ceramics;
A, when filling is carried out to underground mining stope dead zone, ensure that obturation contacts well with stope peripheral rock, connect top completely with top country rock;
B, the obturation stressing conditions being placed in underground mining stope to be decomposed: top is subject to perpendicular stress, and side direction is subject to the horizontal stress of identical side pressure size;
C, the external force σ that top rock mass in mechanical model is produced
vwith lateral pressure σ
abe considered as major principal stress when obturation generation destroys and least principal stress respectively, and meet following criterion:
σ in formula (3)
cfor obturation uniaxial compressive strength;
M, s are dimensionless group, represent the integrality of obturation, relevant with pack grain type, angle of friction, filling quality and mining rate, usual s=0 ~ 0.9, m=0.0001 ~ 25.0.
D, when stope mining rate one timing, exploitation disturbance be certain to causing country rock energy variation, the effect of obturation only need provide enough make up exploitation produce deformation energy just can keep country rock stablizing.
(3) according to the filling stope of different condition to the quality requirements of cemented fill, determine the integrity metrics of cemented fill;
A, to Quality of filling body grade classification;
B, give the integrity metrics of on-the-spot required obturation according to stope filling mining methods type;
(4) by the cemented fill intensity level met under specific filling quality requirement with to meet the intensity level that stope filling body supports oneself when requiring simultaneously and contrast, maximal value between both getting.
A, the index determined substituted in formula (3) and carries out strength of filling mass calculating.
B, underground mining stope obturation also must meet its independence requirement, and computing formula is as follows:
σ in formula
dact on the perpendicular stress bottom obturation;
The height of h obturation;
The width of w obturation;
ρ obturation unit weight.
C, the maximal value selecting two kinds of methods to calculate, this value is the optimum value needed for stope filling body.
The core of described step (1) is stressed by the theoretical clear and definite obturation top of hydrostatic force and lateral force, realizes the standardization of obturation actual forced status; There is contact in the buried depth of the force-bearing situation and stope that determine obturation.
The core of described step (2) is that the destruction of requirement cemented fill follows Hoek-Brown experience Strength Criterion for Ceramics.
Described step (3) can according to for different stowing method types to the requirement of obturation, give the integrity metrics of obturation; Different obturation integrity metrics, the strength of filling mass value of embodiment is different, and filling quality is better, and namely obturation is more complete, and the intensity level of required obturation is also less.
The core of described step (4) is that the obturation resistance to vibration designed must meet following two conditions: criterion one to meet the requirement of obturation self stability; Criterion two is the three-dimensional stress criterion of strength met under multifactor condition, and gets the maximal value between the two.
The beneficial effect that the present invention possesses overcomes the defect that existing strength of filling mass design limitation obtains in experimental formula, provides a kind of quantitatively, dynamic strength of filling mass method for designing.The present invention considers filling stope depth of burial, filling quality factor design stope filling body intensity, not only can specify the strength of filling mass value needed for any one stope, can also guarantee that designed strength of filling mass can ensure stope job safety, the more important thing is, can avoid because the strength of filling mass of empirical method selection is too high and increase mining cost, affecting its economic benefit.
Accompanying drawing explanation
Fig. 1 is strength of filling mass dynamic design approach process flow diagram of the present invention.
Fig. 2 is the stressed Simplified Three-dimensional figure of obturation.
Embodiment
Below the present invention is described further, but protection scope of the present invention is not limited to the scope of following described embodiment.
In conjunction with design flow diagram provided by the present invention, the present invention is described further.Illustrate that the performance of a kind of underground mining stope cemented fill strength design of the present invention is good and bad below by instantiation.
In this example, harmonious mountain iron ore stage afterwards filling stope is positioned at-187m level, earth's surface absolute altitude+30m, Width of stope 12.5m, and height 37m, nugget length 50m, adopt all-tailing cemented filling, top covering rockmass unit weight λ=3.2t/m
3.
Fig. 1 is strength of filling mass dynamic design approach process flow diagram of the present invention.In Fig. 1, step 1: understand fully filling stope depth of burial.
Step 2: according to filling stope depth of burial, stope top covering rockmass unit weight and tectonic structure coefficient, by hydrostatic force theory calculate obturation top and lateral force value.
Step 3: determine the obturation stope method that stope adopts, proposes strength of filling mass calling hierarchy (see table 1), to propose specific requirement value to strength of filling mass.
Step 4: according to the filling stope of different condition to quality requirements index m, the s (see table 1) of cemented fill, determine filling quality integrity levels.
Step 5: after determining obturation top and lateral force value and the complete desired value of filling quality, the strength failure of obturation must meet Hoek-Brown Hoek-brown Strength Criterion.
Step 6: utilize Hoek-Brown Hoek-brown Strength Criterion formula
calculate the intensity level (see table 2) of stope filling body under different condition.
Step 7: utilize stope filling body must meet its independence requirement computing formula
when obtaining filling height 37m, meeting independence intensity level is 0.25MPa (see table 2).
Step 8: the strength of filling mass value that contrast step 6 and step 7 calculate, select the maximal value that two kinds of methods calculate, this value is the optimum value needed for stope filling body.
The classification of table 1 strength of filling mass
Relation between strength of filling mass and filling quality constant when table 2 mining depth 180m, length of stope 25m
The above; be only this with bright preferably embodiment, but protection scope of the present invention is not limited thereto, and is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (5)
1. a underground mining stope cemented fill dynamic changes of strength method for designing, is characterized in that, comprise the following steps:
(1) according to stope depth of burial, stope filling body top stress value and lateral force value is gone out by hydrostatic force theory calculate;
Described method for designing to as if random, obturation top and lateral force value can be calculated according to the actual depth of burial of any stope, theoretical according to hydrostatic force, calculate stope edge stress state by following formula,
Obturation top force bearing formulae:
σ
v＝γH (1)
In formula (1), γ is the density of Overlying Strata In A Face;
H is the depth of burial of stope;
Obturation lateral force formula:
In formula (2), λ is structure coefficient, usually gets 1.1 ~ 1.3;
Wherein, in described formula (2), with
ratio as the correction factor of obturation lateral force;
(2) be the identical stressed problem of three-dimensional of side pressure by obturation and the model simplification of country rock interaction mechanics, the destruction of stope filling body follows Hoek-Brown experience Strength Criterion for Ceramics;
A, when filling is carried out to underground mining stope dead zone, ensure that obturation contacts well with stope peripheral rock, connect top completely with top country rock;
B, the obturation stressing conditions being placed in underground mining stope to be decomposed: top is subject to perpendicular stress, and side direction is subject to the horizontal stress of identical side pressure size;
C, the external force σ that top rock mass in mechanical model is produced
vwith lateral pressure σ
abe considered as major principal stress when obturation generation destroys and least principal stress respectively, and meet following criterion:
σ in formula (3)
cfor obturation uniaxial compressive strength;
M, s are dimensionless group, represent the integrality of obturation, relevant with pack grain type, angle of friction, filling quality and mining rate, usual s=0 ~ 0.9, m=0.0001 ~ 25.0.
D, when stope mining rate one timing, exploitation disturbance be certain to causing country rock energy variation, the effect of obturation only need provide enough make up exploitation produce deformation energy just can keep country rock stablizing.
(3) according to the filling stope of different condition to the quality requirements of cemented fill, determine the integrity metrics of cemented fill;
A, to Quality of filling body grade classification;
B, give the integrity metrics of on-the-spot required obturation according to stope filling mining methods type;
(4) by the cemented fill intensity level met under specific filling quality requirement with to meet the intensity level that stope filling body supports oneself when requiring simultaneously and contrast, maximal value between both getting.
A, the index determined substituted in formula (3) and carries out strength of filling mass calculating.
B, underground mining stope obturation also must meet its independence requirement, and computing formula is as follows:
σ in formula
dact on the perpendicular stress bottom obturation;
The height of h obturation;
The width of w obturation;
ρ obturation unit weight.
C, the maximal value selecting two kinds of methods to calculate, this value is the optimum value needed for stope filling body.
2. a kind of underground mining stope cemented fill dynamic changes of strength method for designing according to claim 1, it is characterized in that: the core of described step (1) is stressed by the theoretical clear and definite obturation top of hydrostatic force and lateral force, realizes the standardization of obturation actual forced status; There is contact in the buried depth of the force-bearing situation and stope that determine obturation.
3. a kind of underground mining stope cemented fill dynamic changes of strength method for designing according to claim 1, is characterized in that: the core of described step (2) is that the destruction of requirement cemented fill follows Hoek-Brown experience Strength Criterion for Ceramics.
4. a kind of underground mining stope cemented fill dynamic changes of strength method for designing according to claim 1, is characterized in that: described step (3) can according to for different stowing method types to the requirement of obturation, give the integrity metrics of obturation; Different obturation integrity metrics, the strength of filling mass value of embodiment is different, and filling quality is better, and namely obturation is more complete, and the intensity level of required obturation is also less.
5. a kind of underground mining stope cemented fill dynamic changes of strength method for designing according to claim 1, is characterized in that: the core of described step (4) is that the obturation resistance to vibration designed must meet following two conditions: criterion one to meet the requirement of obturation self stability; Criterion two is the three-dimensional stress criterion of strength met under multifactor condition, and gets the maximal value between the two.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105574250A (en) * | 2015-12-15 | 2016-05-11 | 中国电建集团中南勘测设计研究院有限公司 | Concrete material partition design method |
| CN108229062A (en) * | 2018-01-31 | 2018-06-29 | 西安科技大学 | Method based on sensibility micro-parameter prediction cemented fill mechanical response characteristic |
| CN108256258A (en) * | 2018-01-31 | 2018-07-06 | 西安科技大学 | Cemented fill mechanical response characteristic Forecasting Methodology based on SEM image |
| CN112115617A (en) * | 2020-09-21 | 2020-12-22 | 玉溪矿业有限公司 | Filling body strength matching system, construction method thereof and filling body strength matching method |
| CN114021289A (en) * | 2021-12-10 | 2022-02-08 | 武钢资源集团大冶铁矿有限公司 | High-order section cemented filling body strength optimization configuration method and application |
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| WO2015031177A1 (en) * | 2013-08-24 | 2015-03-05 | Schlumberger Canada Limited | Formation stability modeling |
| CN103758519A (en) * | 2013-12-27 | 2014-04-30 | 金川集团股份有限公司 | Thick and large mineral deposit stage subsequent filling method mining piecewise optimization design and implementation method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105574250A (en) * | 2015-12-15 | 2016-05-11 | 中国电建集团中南勘测设计研究院有限公司 | Concrete material partition design method |
| CN105574250B (en) * | 2015-12-15 | 2018-10-26 | 中国电建集团中南勘测设计研究院有限公司 | A kind of concrete material partition design method |
| CN108229062A (en) * | 2018-01-31 | 2018-06-29 | 西安科技大学 | Method based on sensibility micro-parameter prediction cemented fill mechanical response characteristic |
| CN108256258A (en) * | 2018-01-31 | 2018-07-06 | 西安科技大学 | Cemented fill mechanical response characteristic Forecasting Methodology based on SEM image |
| CN108256258B (en) * | 2018-01-31 | 2019-01-25 | 西安科技大学 | Cemented fill mechanical response characteristic prediction technique based on SEM image |
| CN108229062B (en) * | 2018-01-31 | 2019-03-01 | 西安科技大学 | Method based on sensibility micro-parameter prediction cemented fill mechanical response characteristic |
| CN112115617A (en) * | 2020-09-21 | 2020-12-22 | 玉溪矿业有限公司 | Filling body strength matching system, construction method thereof and filling body strength matching method |
| CN114021289A (en) * | 2021-12-10 | 2022-02-08 | 武钢资源集团大冶铁矿有限公司 | High-order section cemented filling body strength optimization configuration method and application |
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