CN106150545A - A kind of method carrying out goaf part filling according to roof caving feature - Google Patents
A kind of method carrying out goaf part filling according to roof caving feature Download PDFInfo
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- CN106150545A CN106150545A CN201610641374.0A CN201610641374A CN106150545A CN 106150545 A CN106150545 A CN 106150545A CN 201610641374 A CN201610641374 A CN 201610641374A CN 106150545 A CN106150545 A CN 106150545A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000000945 filler Substances 0.000 claims abstract description 30
- 239000000178 monomer Substances 0.000 claims abstract description 26
- 239000011435 rock Substances 0.000 claims abstract description 14
- 238000000605 extraction Methods 0.000 claims abstract description 12
- 238000013461 design Methods 0.000 claims description 25
- 239000010881 fly ash Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 4
- 230000009172 bursting Effects 0.000 claims description 2
- 238000007596 consolidation process Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims description 2
- 238000003325 tomography Methods 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims 2
- 238000005065 mining Methods 0.000 description 14
- 239000003245 coal Substances 0.000 description 10
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009415 formwork Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of method carrying out goaf part filling according to roof caving feature, including: according to goaf first roof caving step pitch, arrange the high intensity filling band being perpendicular or parallel to direction of extraction in goaf, control being caving of direct top;According to the sag on directly top, arrange that number arranges difform high intensity filling monomer at filling bar interband interval, control the deformation on directly top;Filling on a large scale, proof stress centrostigma is carried out in special geological structure position;Form " high-strength obturator is directly pushed up " structure control system, support overlying rock together;Arrange narrow filling band gob side entry retaining, reduce subsequent work Mian Jue lane workload, and close bashing.Present invention saves filler, reduce filling cost;Difform filling structure is arranged at key position, effective to Roof Control, prevent part obturator from destroying the chain reaction causing the whole district;Spatial reuse can be descended in large quantities to formed after filling.
Description
Technical field
The present invention relates to a kind of method carrying out goaf part filling according to roof caving feature, belong to filling mining neck
Territory.
Background technology
For a long time, the commonly used caving method of China processes the goaf of underground mineral resources, the method mechanization degree
Higher with production efficiency, but also result in overlying rock and deform on a large scale and be caving, cause roof fracture permeable broken with lithic drainage
Environment and the safety such as bad, subsidence and buildings or structures destruction, the accumulation of spoil ground, the irregularly accumulation of goaf harmful gas
Problem.Meanwhile, China also exists substantial amounts of " three times " resource, and under the present situation that resource is day by day exhausted, this part resource is urgently
It is released utilizing.The method controlling subsidence in underground mineral resources exploitation mainly has partial mining and filling mining, or
Being both combinations, traditional partial mining method includes room mining, Striping noise, pillar-and-panel work etc., be required for staying set big
The ore pillar of amount, recovery ratio is low, causes a large amount of wastes of underground mineral resources, it is difficult to the exploitation effectively solving " three times " resource is asked
Topic.In recent years, under the theory of " lasting exploit " and the promotion of Mining Policy, filling mining is as controlling environmental disruption and solution
The means of " three times " resource exploitation, develop rapidly in mining engineering, and at obturator arrangement, filler, fill
Fill out the aspects such as technique to make some progress.
The best mode that goaf carries out filling is entirely to adopt entirely to fill, and is full of by filler whole mined out the most as far as possible
District, replaces the mineral products being produced out with filler, controls the migration of overlying rock.Entirely adopt and entirely fill the control that can reach good
Effect, but need substantial amounts of filler, filling cost is higher.Meanwhile, quick along with improvement and the filling mining of production practice
Development, available mining solid waste constantly reduces, and little by little can not meet and entirely adopt the demand entirely filled.How to solve mining
Balance between solid waste quantum of output and filler demand, becomes current and filling mining from now on subject matter.
Therefore, on the basis of Quan Caiquan fills, for reducing filler usage amount, reducing filling cost, goaf is carried out part and fills
Fill out.The mode that part filling is commonly used has strip-type filling and pier stud type filling etc., although these filling methods have saved filling material
Material, but fill planning owing to lacking reasonably to adopt, and filling form is single, and filling effect is not ideal, and roof deformation amount is difficult to control
System.The problem existed for coal mine filling exploitation, on the basis of the part filling thought of goaf, it is proposed that according to roof caving
Feature predicts the method carrying out goaf part filling mining.
Summary of the invention
It is desirable to provide a kind of method carrying out goaf part filling according to roof caving feature, according to goaf
Roof caving feature, is predicted by early stage and adopts and fill planning, arranges that high-strength filling is tied targetedly at goaf key position
Structure body, forms " obturator-directly push up " structure control system, controls the deformation and failure of overlying rock.
The invention provides a kind of method carrying out goaf part filling according to roof caving feature, in following
Hold:
According to goaf first roof caving step pitch, arrange high intensity filling band at goaf key position, high-strength
Degree filling band is perpendicular or parallel with direction of extraction, controls being caving of direct top;The sag directly pushed up according to empty top zone,
Filling bar interband interval arranges that number arranges difform high intensity filling monomer, controls the deformation on directly top;There is special geology
Structure, then carry out filling on a large scale, proof stress centrostigma in special geological structure position;High intensity filling band and filling list
Body controls stablizing of direct top, forms " high-strength obturator-directly push up " structure control system, supports overlying rock together;Arrange
Narrow filling band gob side entry retaining, reduces subsequent work Mian Jue lane workload, and closes bashing.
Described goaf key position be the disconnected place of direct bursting, directly top Deformation control point, roof Stress centrostigma, along empty
Stay at lane.
Described difform high intensity filling monomer includes cross, T-shaped, square or prism structure.
Described special geological structure position refers to tomography, karst collapse col umn, fold, fissure zone or weak floor retention of excessive fluid district.
Described high-strength obturator uses intensity to be the filler of 6-10MPa, and can as required in obturator appearance and
Inside carries out arrangement of reinforcement or other consolidation process.
The concrete operation step of said method is as follows:
(1) according to mine geology condition, suffered evenly load q in directly top, first roof caving step pitch L are calculated;
Described
As (qn+1)1<(qn)1Time, q=(qn)1;
Wherein: E1、E2、…EnFor the elastic modelling quantity of each rock stratum, n is rock stratum number, h1、h2…hnFor the thickness of each rock stratum, h1
For immediate roof thickness, RTFor directly offending and disobeying with rude remarks tensile strength, q is the overlying load acting on directly top, k1For safety coefficient;V1、V2、
V3、......VnUnit weight for each rock stratum;
2. according to spacing L directly pushing up caving angle appropriate design filling band1, directly push up deflection according to bar interband
WmaxIt is L at filling bar interband arrangement pitch2Filling monomer;
Described L1< L,
In formula, I1For directly pushing up the moment of inertia;E1For the elastic modelling quantity on directly top, h1For the thickness on directly top, q is for acting on
The directly overlying load on top, L2For filling monomer spacing;
3. select high-strength filler, according to intensity f of fillercuWith the overlying load q design acting on directly top
The width a of filling band, the cross-sectional area A of bar interband high intensity filling monomer designs according to self stability, equivalence depth-width ratioIt is not more than 2;Equivalence depth-width ratio refers to the height h of filling monomer and the ratio of its width, and described width is by difformity
High intensity filling monomer equivalence Cheng Yuqi width time there is the four-prism of same cross-sectional area A
DescribedWherein: L is first roof caving step pitch, q is the overlying load acting on directly top, fcu
For obturator comprcssive strength, k2For safety coefficient;
As a kind of preferred version, described high-strength filler is spoil-flyash paste filling material, and its intensity can reach
To 6-10MPa, concrete quality proportioning is: cement: flyash: water: spoil=1: 2: 2: 5, and wherein the thin spoil of 0-5mm accounts for total cash
The 30% of stone, in 5-10mm, spoil, 10-15mm thick spoil consumption all account for the 35% of total spoil, and the mass fraction of filler is
80%, different additives can be added according to actual requirement.
As another kind of preferred version, described high-strength filler is spoil-discarded concrete paste filling material, intensity
Can reach 6-10MPa, concrete quality proportioning is: cement: flyash: water: spoil: discarded concrete=1: 2: 2: 3.5: 1.5,
Wherein: wherein the thin spoil of 0-5mm and the thick spoil of 10-15mm all account for the 25% of total spoil, and in 5-10mm, spoil accounts for total spoil
50%;The thin discarded concrete of 0-5mm accounts for the 40% of total discarded concrete, and in 5-10mm, discarded concrete and 10-15mm slightly discard
Concrete amount accounts for the 30% of total discarded concrete respectively;The mass fraction of filler is 80%;The quality of filler is divided
Number is 80%, can add different additives according to actual requirement.
4. design gob side entry retaining filling strip width c: for meeting supporting requirement, c >=2.5m
5. along with the propelling of work surface, setting up template when exploitation to design filling position and carry out filling, filling band is adopted
Filling is carried out with sliding formwork.
Beneficial effects of the present invention:
(1) compared with whole caving methods: effectively controlroof deformation failure and subsidence, railways and water-bodies extraction is improved
Rate, protects environment;
(2) compared with entirely adopting and entirely filling: carry out part filling according to detailing requiments, filler can be saved, reduce filling
Cost;
(3) compared with strip-type filling and pier stud type filling: according to roof caving bending features, arrange not at key position
The filling structure of similar shape, effective to Roof Control, prevent part obturator from destroying the chain reaction causing the whole district;
(4) spatial reuse can be descended in large quantities to formed after filling.
Accompanying drawing explanation
Fig. 1 is the part placement method schematic diagram that goaf is perpendicular to direction of extraction layout filling band
Fig. 2 is the part placement method schematic diagram that goaf is parallel to direction of extraction layout filling band
Fig. 3 is the part placement method schematic diagram that filling band is arranged in goaf.
In figure: 1. be perpendicular to the filling band of direction of extraction;The most cross filling monomer;3. adopt and fill work surface and stay along sky
Lane filling band;4. unmind ore body;5. go up one to adopt and fill work surface gob side entry retaining filling band;6. it is parallel to filling of direction of extraction
Fill out band;7.T shape filling monomer;The most square filling monomer;A is direction of extraction.
Detailed description of the invention
Further illustrate the present invention below by embodiment, but be not limited to following example.
Embodiment 1:
Certain ore deposit minable coal seam is composed to deposit and is stablized, and geological structure is simple, the Protodyakonov coefficient f=2~4 in coal seam.Seam inclination 2 °~
10 °, average 4 °;Coal seam thickness is 3.20~3.30m.Directly top for thick for 3.8m siltstone (unidirectional tensile strength is 6.8MPa,
Elastic modelling quantity is 20.8MPa), old top is packsand (unidirectional tensile strength is 7.98MPa), and thick 6.87m is respectively thickness on it
The carbonaceous mudstone of 0.34m, 5.17m and 5.23m, siltstone and conglomerate.
1. according to calculating: directly suffered evenly load q=0.095MPa in top, first roof caving step pitch L=26.3m;
2. design is perpendicular to the filling band of direction of extraction, and spacing is L1=25m, is evenly arranged filling at filling bar interband
Monomer;
3. select spoil-flyash paste filling material, proportioning be thin spoil consumption be 285kg/m3In, thick spoil use
Amount is 332.5kg/m3, the consumption of cement and flyash is respectively 190kg/m3And 380kg/m3, water consumption is 380kg/m3,
The mass fraction of filler is 80%, according to intensity f of fillercuSuffered evenly load q=in=6.6MPa and directly top
0.095MPa, the width a=6m of design filling band, and A=20m is amassed in design section betwixt2Cross filling monomer;
4. design gob side entry retaining size c=3m;
5. along with the propelling of work surface, setting up template when exploitation to design filling position and carry out filling, filling band is adopted
Filling is carried out with sliding formwork.
Embodiment 2:
Certain ore deposit minable coal seam is composed to deposit and is stablized, and geological structure is simple, the Protodyakonov coefficient f=2~4 in coal seam.Seam inclination 2 °~
10 °, average 4 °;Coal seam thickness is 3.20~3.30m.Directly top for thick for 3.8m siltstone (unidirectional tensile strength is 6.8MPa,
Elastic modelling quantity is 20.8MPa), old top is packsand (unidirectional tensile strength is 7.98MPa), and thick 6.87m is respectively thickness on it
The carbonaceous mudstone of 0.34m, 5.17m and 5.23m, siltstone and conglomerate.
1. according to calculating: directly suffered evenly load q=0.095MPa in top, first roof caving step pitch L=26.3m;
2. design is parallel to the filling band of direction of extraction, and spacing is 25m, averagely arranges filling list at filling bar interband
Body;
3. selecting spoil-discarded concrete paste filling material, its proportioning is: the thin spoil of 0-5mm and the thick spoil of 10-15mm
The equal 166.25kg/m of consumption3, in 5-10mm, spoil consumption is 332.5kg/m3;0-5mm thin discarded concrete consumption is 114kg/
m3, in 5-10mm, discarded concrete and 10-15mm thick discarded concrete consumption are 85.5kg/m3;Cement and the consumption of flyash
It is respectively 190kg/m3And 380kg/m3, water consumption is 380kg/m3, the mass fraction of filler is 80%, adds 0.3%
High-efficiency water-reducing agent of poly-carboxylic acid;Intensity f according to fillercuSuffered evenly load q=0.095MPa in=8.4MPa and directly top,
The width a=5m of design filling band;And design two row sectional area A=20m betwixt2Cross monomer and sectional area A=
16m2T-shaped monomer;
4. design gob side entry retaining size c=3m;
5., along with the propelling of work surface, set up template when exploitation to design filling position and carry out filling.
Embodiment 3:
No. 3 coal seams of certain coal mining directly push up for light grey Sandy Silt and fine sandstone (wherein comprise two-layer bog-head coal,
The thickest 0.5m), compact massive constructs, and average thick 4.40m, based on stratiform, layer is less grown to crack, and comprcssive strength is 30.3
~75.9MPa, average 65.3MPa, tensile strength is 1.5MPa.
1. according to calculating suffered evenly load q=0.946MPa in directly top, first roof caving step pitch L=22m;
2. less owing to directly pushing up intensity, design the two-way filling band parallel and perpendicular to direction of extraction, spacing is
22m, is evenly arranged filling monomer at filling bar interband;
3. select spoil-flyash paste filling material, proportioning be thin spoil consumption be 285kg/m3In, thick spoil contains
Amount consumption is 332.5kg/m3, the consumption of cement and flyash is respectively 190kg/m3And 380kg/m3, water consumption is 380kg/
m3, the mass fraction of filler is 80%, according to intensity f of fillercuSuffered evenly load q in=6.6MPa and directly top
=0.946MPa, the width a=5m of design filling band;And design two to three rows are cross, T-shaped betwixt and square filling list
Body;And entirely fill at exploiting field intermediate thin weak-strong test;
4. design gob side entry retaining size c=4m;
5. along with the propelling of work surface, setting up template when exploitation to design filling position and carry out filling, filling band is adopted
Filling is carried out with sliding formwork.
Claims (8)
1. the method carrying out goaf part filling according to roof caving feature, it is characterised in that include herein below:
According to goaf first roof caving step pitch, arranging high intensity filling band at goaf key position, high intensity is filled
Fill out band perpendicular or parallel with direction of extraction, control being caving of direct top;The sag directly pushed up according to empty top zone, in filling
Bar interband is evenly arranged number and arranges difform high intensity filling monomer, controls the deformation on directly top;There is special geological structure,
Filling on a large scale, proof stress centrostigma is then carried out in special geological structure position;High intensity filling band and filling monomer control
Stablizing of system directly top, forms " high-strength obturator-directly push up " structure control system, supports overlying rock together;Arrange narrow filling
Fill out band gob side entry retaining, reduce subsequent work Mian Jue lane workload, and close bashing.
The method carrying out goaf part filling according to roof caving feature the most according to claim 1, it is characterised in that:
Described goaf key position is at the disconnected place of direct bursting, directly top Deformation control point, roof Stress centrostigma, gob side entry retaining.
The method carrying out goaf part filling according to roof caving feature the most according to claim 1, it is characterised in that:
Described difform high intensity filling monomer includes cross, T-shaped, square or prism structure.
The method carrying out goaf part filling according to roof caving feature the most according to claim 1, it is characterised in that:
Described special geological structure position refers to tomography, karst collapse col umn, fold, fissure zone or weak floor retention of excessive fluid district.
The method carrying out goaf part filling according to roof caving feature the most according to claim 1, it is characterised in that:
Described high intensity filling band and high intensity filling monomer use intensity to be the filler of 6-10MPa, and are filling as required
Fill out external table and inside carries out arrangement of reinforcement or other consolidation process.
The method carrying out goaf part filling according to roof caving feature the most according to claim 1, it is characterised in that:
Concrete operation step is as follows:
(1) according to mine geology condition, suffered evenly load q in directly top, first roof caving step pitch L are calculated;
Described
As (qn+1)1<(qn)1Time, q=(qn)1;
Wherein: E1、E2、…EnFor the elastic modelling quantity of each rock stratum, n is rock stratum number, h1、h2…hnFor the thickness of each rock stratum, h1For directly
Top thickness degree, RTFor directly offending and disobeying with rude remarks tensile strength, q is the overlying load acting on directly top, k1For safety coefficient;V1、V2、
V3、......VnUnit weight for each rock stratum;
(2) according to spacing L directly pushing up caving angle appropriate design filling band1, directly push up deflection W according to bar interbandmax?
Filling bar interband arrangement pitch is L2Filling monomer;
Described L1< L,
In formula, I1For directly pushing up the moment of inertia;L1For filling striation widths, E1For the elastic modelling quantity on directly top, h1Thickness for directly top
Degree, q is the overlying load acting on directly top, L2For filling monomer spacing;
(3) high-strength filler is selected, according to intensity f of fillercuWith the overlying load q design filling acting on directly top
The width a of band, is evenly arranged number at filling bar interband and arranges difform high intensity filling monomer, high intensity filling monomer
Cross-sectional area A designs according to self stability, equivalence depth-width ratioIt is not more than 2;Equivalence depth-width ratio refers to the height of filling monomer
H and the ratio of its width, described width is for have identical cross-section by difform high intensity filling monomer equivalence Cheng Yuqi
Amass the width during four-prism of A
Described
Wherein: L is first roof caving step pitch, q is the overlying load acting on directly top, fcuFor obturator comprcssive strength,
k2For safety coefficient;
(4) design gob side entry retaining filling strip width c: for meeting supporting requirement, c >=2.5m
(5) along with the propelling of work surface, setting up template when exploitation to design filling position and carry out filling, filling band uses sliding
Mould carries out filling.
The method carrying out goaf part filling according to roof caving feature the most according to claim 6, it is characterised in that:
Described high-strength filler is spoil-flyash paste filling material, and its intensity can reach 6-10MPa, concrete quality proportioning
For cement: flyash: water: spoil=1: 2: 2: 5, wherein the thin spoil of 0-5mm accounts for the 30% of total spoil, spoil in 5-10mm,
10-15mm thick spoil consumption all accounts for the 35% of total spoil, and the mass fraction of filler is 80%, adds not according to actual requirement
Same additive.
The method carrying out goaf part filling according to roof caving feature the most according to claim 6, it is characterised in that:
Described high-strength filler is spoil-discarded concrete paste filling material, and intensity can reach 6-10MPa, and concrete quality is joined
Ratio is: cement: flyash: water: spoil: discarded concrete=1: 2: 2: 3.5: 1.5, wherein: the wherein thin spoil of 0-5mm and 10-
The thick spoil of 15mm all accounts for the 25% of total spoil, and in 5-10mm, spoil accounts for the 50% of total spoil;The thin discarded concrete of 0-5mm accounts for total useless
Abandoning the 40% of concrete, in 5-10mm, discarded concrete and 10-15mm thick discarded concrete consumption account for total discarded concrete respectively
30%;The mass fraction of filler is 80%;The mass fraction of filler is 80%, adds difference according to actual requirement
Additive.
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CN109356582A (en) * | 2018-11-15 | 2019-02-19 | 山东科技大学 | A kind of filling mining method for comprehensive extracting and caving face |
CN109611134A (en) * | 2018-11-12 | 2019-04-12 | 山东科技大学 | A kind of grouting cable anchor and strip filling method for loose media strip filling |
CN109610622A (en) * | 2018-11-05 | 2019-04-12 | 太原理工大学 | A kind of coal mining area strip-type construction filling guarantor-water storage system |
CN109681206A (en) * | 2018-08-20 | 2019-04-26 | 华北科技学院 | A method of filling control ground settlement of mining |
CN112412459A (en) * | 2020-12-17 | 2021-02-26 | 贵州大学 | Special strip type filling mining method |
CN112502772A (en) * | 2020-11-27 | 2021-03-16 | 安徽理工大学 | Goaf solid waste-ultrahigh water paste alternating filling method |
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CN109610622A (en) * | 2018-11-05 | 2019-04-12 | 太原理工大学 | A kind of coal mining area strip-type construction filling guarantor-water storage system |
CN109610622B (en) * | 2018-11-05 | 2021-04-06 | 太原理工大学 | Filling, protecting and water storing system with strip-type structure for coal mining area |
CN109611134A (en) * | 2018-11-12 | 2019-04-12 | 山东科技大学 | A kind of grouting cable anchor and strip filling method for loose media strip filling |
CN109611134B (en) * | 2018-11-12 | 2020-03-31 | 山东科技大学 | Grouting anchor cable for filling loose body strips and strip filling method |
CN109356582A (en) * | 2018-11-15 | 2019-02-19 | 山东科技大学 | A kind of filling mining method for comprehensive extracting and caving face |
CN109356582B (en) * | 2018-11-15 | 2019-09-03 | 山东科技大学 | A kind of filling mining method for comprehensive extracting and caving face |
WO2020098089A1 (en) * | 2018-11-15 | 2020-05-22 | 山东科技大学 | Filling mining method for fully mechanized top coal caving working face |
CN112502772A (en) * | 2020-11-27 | 2021-03-16 | 安徽理工大学 | Goaf solid waste-ultrahigh water paste alternating filling method |
CN112412459A (en) * | 2020-12-17 | 2021-02-26 | 贵州大学 | Special strip type filling mining method |
CN112412459B (en) * | 2020-12-17 | 2022-07-12 | 贵州大学 | Special strip type filling mining method |
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