CN107165633B - A kind of thin coal pillar width of barrier adjacent air space area gas porous flow determines method - Google Patents
A kind of thin coal pillar width of barrier adjacent air space area gas porous flow determines method Download PDFInfo
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- CN107165633B CN107165633B CN201710327938.8A CN201710327938A CN107165633B CN 107165633 B CN107165633 B CN 107165633B CN 201710327938 A CN201710327938 A CN 201710327938A CN 107165633 B CN107165633 B CN 107165633B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
A kind of thin coal pillar width of barrier adjacent air space area gas porous flow determines that method is to acquire coal petrography sample by drill hole sampling, and measure the mechanics parameter of coal petrography sample, and then obtain the First Weighting Interval of Main of working face base object model, establish mathematical calculation model, apply corresponding constraint and load on institute's established model boundary, and stay width coal column along mined out area edge, it is designed according to gob side entry, simulation exploitation, it calculates, until working face wall where plane correspond to coal column position back production side fracture area thickness and back production side fracture area thickness composite demand when, obtain the thickness of the thickness and back production side fracture area of the mined out side fracture area of thin coal pillar.The present invention overcomes thin coal pillar stay set in only focus on its stability and the deficiency of ignoring coal column to the barriering effect of goaf gas, the geometric parameter of stable region in coal column is fully considered to safeguarding gob side entry adjoining rock stability and obstruct effect of the adjacent air space area's gas to excavation seepage flow, makes to stay and sets thin coal pillar and have above two function.
Description
Technical field
The present invention relates to a kind of gob side entry retaining thin coal pillar width to determine method, especially a kind of barrier adjacent air space area gas porous flow
Thin coal pillar width determine method.
Background technology
Supporting roadway with narrow coal pillar has the advantages such as coal recovery rate is high, economic and social benefit is good.But highly gassy mine is opened
In adopting, to prevent thin coal pillar quilt under lead abutment pressure superposition in goaf lateral-supporting pressure and this working face extraction
Pressure break causes adjacent air space area gas to enter excavation, brings security risk, hold the prudent attitude to supporting roadway with narrow coal pillar, this is just hindered
The popularization of supporting roadway with narrow coal pillar technology.Therefore, in highly gassy mine thin coal pillar along empty arrangement, the determination of thin coal pillar rational width
Not only to be conducive to safeguard gob side entry adjoining rock stability, but also the gas that must also be able to effectively obstruct adjacent goaf enters back
Mined out.
The determination of thin coal pillar rational width has in invention disclosed patent, Publication No. CN104594899A patents of invention " one
Kind gob side entry driving thin coal pillar rational width determines method ", from stability of the roadway angle is safeguarded, consider thin coal pillar width
With base object model fracture position relationship, provides thin coal pillar rational width and determine method, but will not completely cut off adjacent air space area's gas porous flow conduct
The influence factor that thin coal pillar width is determined." super high seam gob side entry driving is narrow for the patent of invention of Publication No. CN106089207A
Coal column stays equipment, method ", in thin coal pillar back production side, installed anchor pole doubles as arrangement of reinforcement and casting concrete forms similar retaining wall
Artificial works, to safeguard stability of the roadway, but the rigid artificial works of this kind easily generate tensile stress in coal column deformation process
And crack, lose its proper function.A kind of patent of invention " anti-goaf watt of deep-well gob side entry driving of publication number CN105422128A
This method of seepage " is that into thin coal pillar, slip casting blocks wherein crack and injection flexible concrete spray coating by hollow grouting cable anchor
To achieve the purpose that prevent goaf gas seepage flow, but there are processes deficiency more, of high cost.
Invention content
The present invention is to solve the problems, such as that thin coal pillar is not suitable with highly gassy mine, provide a kind of effectively barrier adjacent air space area's gas to
The thin coal pillar width of excavation seepage flow determines method, determines that thin coal pillar is rationally wide using numerical simulation, the method for theoretical calculation
Degree, can not only safeguard gob side entry adjoining rock stability, and can effectively obstruct adjacent air space area gas to excavation seepage flow.
The above-mentioned purpose of the present invention is realized by following scheme.
A kind of thin coal pillar width of barrier adjacent air space area gas porous flow determines method, the thin coal pillar width determine method be by
What the following steps carried out：
（One）By drill hole sampling method, the coal petrography sample of collecting work face coal seam, top plate and floor strata at the scene；
（Two）By step（One）The coal petrography sample of acquisition is processed into standard coal rock specimen in laboratory, is surveyed with rock mechanics intensity
Examination equipment measures the mechanics parameter of coal petrography sample；
The coal petrography sample mechanics parameter refers to uniaxial compressive strength, uniaxial tensile strength, shearing strength, Poisson's ratio, elasticity
Modulus, cohesive force, internal friction angle, bulk modulus and modulus of shearing, coal petrography sample modulus of shearing and bulk modulus are by following public affairs
Formula calculates：
In formula：G- modulus of shearing, MPa；K- bulk modulus, MPa；E-elasticity modulus, MPa；μ- Poisson's ratio；
（Three）Using live mine pressure measurement method, the First Weighting Interval of Main of working face base object model is obtainedL；
（Four）The coal rock layer respective thickness and step provided according to working face geology log sheet（Two）Built coal seam,
Top plate and floor rock mechanics parameter, establish mathematical calculation model；
（Five）In step（Four）Institute's established model boundary applies corresponding constraint and load, and stays width along the edge in goafT 1
=3m coal columns dig lane according to gob side entry design geometric dimension；After gob side entry is formed, simulation exploitation working face, the advance of the face
To step（Three）Obtain First Weighting Interval of MainLWhen, plane where measuring working face wall corresponds to the mined out side of coal column position
The thickness of fracture areaX 1With the thickness of back production side fracture areaY 1, calculateX 1+Y 1IfX 1+Y 1≥T 1, then widen coal column and count again
It calculates；In step（Four）The width is stayed to be along mined out area edge in institute's established modelT 2=4m coal columns design geometric dimension according to gob side entry
Lane is dug, after gob side entry is formed, simulation exploitation working face, the advance of the face to step（Three）Obtain First Weighting Interval of MainLWhen, it surveys
Plane where going out working face wall corresponds to the thickness of the mined out side fracture area of coal column positionX 2With the thickness of back production side fracture area
DegreeY 2, calculateX 2+Y 2IfX 2+Y 2≥T 2, then widen coal column and recalculate；The rest may be inferred, until plane pair where working face wall
Answer the thickness of coal column position back production side fracture areaX nMeet with the thickness of back production side fracture areaX n+Y n<T nWhen, it finally obtains
The thickness of the mined out side fracture area of thin coal pillarX=X nWith the thickness of back production side fracture areaY=Y n；
（Six）According to gob side entry design section clear heightHDetermine the thickness of stable region in thin coal pillart：Stable region in thin coal pillar
ThicknesstNet section height is designed for gob side entryHHalf, i.e.,：T=1/2H；
（Seven）The thin coal pillar width determines the thin coal pillar rational width of methodTIt is the thickness of the mined out side fracture area of coal columnX、
The thickness of back production side fracture areaYAnd the thickness of middle part stable regiontThe sum of, i.e.,：T=t+X+Y。
In the above-mentioned technical solutions, further technical characteristic is as follows.
The top plate of the drill hole sampling method samples total length >=20m, and bottom plate samples total length >=10m, and coal seam sampling is total
Length >=3m.
The thickness of stable region in determined thin coal pillartThe minimum thickness of stable region when being working face first weighting.
Institute's established model is comprising this section stope and adjacent goaf, and wherein this stope plagioclase is
The 1/2, the 1/2 of adjacent goaf plagioclase >=practical plagioclase of >=practical plagioclase, strike length >=100m, top plate thickness >=20m, bottom
Plate thickness >=10m.
The thin coal pillar width of stable region takes T successively in the thin coal pillar1=3m, T2=4m ... ..., Tn=（n+2）m.
Stable region refers to that the part coal body is in stress state before its stress-strain full distance curve peak in the thin coal pillar.
It is complete to refer to that the part coal body is in its stress-strain for back production side fracture area and mined out side fracture area in the thin coal pillar
Stress state after journey curve peak.
Realize that above-mentioned technical proposal, advantage are as follows with good effect.
Thin coal pillar is divided into back production side fracture area, stable region and mined out side fracture area by the present invention, according to top plate and bottom plate,
The mechanics parameter in coal seam establishes numerical model with gob side entry design net section geometric dimension, and mined out side is determined by numerical computations
Fracture area thickness and back production side fracture area thickness, and determine that stable region thickness, the sum of final three are using theoretical calculation
Obstruct the thin coal pillar rational width of adjacent air space area gas porous flow.The present invention overcomes thin coal pillar stay set in only focus on its stability and neglect
Slightly coal column fully considers the geometric parameter of stable region in coal column to safeguarding along empty lane the deficiency of the barriering effect of goaf gas
Road adjoining rock stability and effect of the barrier adjacent air space area's gas to excavation seepage flow, make to stay and set thin coal pillar and have above two work(
Energy.
Description of the drawings
Fig. 1 is thin coal pillar position of the present invention and its zoning plan.
In figure：1：Back production side fracture area in thin coal pillar；2：Stable region in thin coal pillar；3：Mined out side fracture area in thin coal pillar；
4：Gob side entry；5：This section stope coal body；6 adjacent goafs.
Fig. 2 is thin coal pillar rational width mathematical calculation model figure of the present invention.
Fig. 3 is 3m wide coal pillar minings of the present invention to coal column fracture area distribution map when First Weighting Interval of Main.
Fig. 4 is 4m wide coal pillar minings of the present invention to coal column fracture area distribution map when First Weighting Interval of Main.
Fig. 5 is 10m wide coal pillar minings of the present invention to coal column fracture area distribution map when First Weighting Interval of Main.
Specific implementation mode
Specific be described in detail is made to the specific implementation mode of invention below.
The thin coal pillar width for implementing a kind of barrier adjacent air space area gas porous flow determines method, which determines that method is
Follow these steps progress：
Step 1: by the method for drill hole sampling, the coal petrography of collecting work face coal seam, top plate and floor strata at the scene
Sample；
The drill hole sampling refers to the top plate sampling not small 20m of total length, and bottom plate samples total length and is not less than 10m, and coal seam takes
Sample total length is not less than 3m.
Step 2: the coal petrography sample that step 1 obtains is processed into standard coal rock specimen in laboratory, with rock mechanics intensity
Test equipment measures the mechanics parameter of coal petrography sample.
The coal petrography sample mechanics parameter refers to its uniaxial compressive strength, uniaxial tensile strength, shearing strength, Poisson's ratio, bullet
Property modulus, cohesive force, internal friction angle, bulk modulus and modulus of shearing, coal petrography sample modulus of shearing and bulk modulus pass through following public affairs
Formula calculates：
G=E/2（1+ μ） K=E/3（1+2μ）
In formula：G--- modulus of shearing, MPa；K--- bulk modulus, MPa；E --- elasticity modulus, MPa；μ--- Poisson
Than.
Step 3: using the method for live mine pressure actual measurement, the First Weighting Interval of Main of working face base object model is obtainedL；
Step 4: according to the coal rock layer respective thickness and the obtained coal of step 2 of the offer of working face geology log sheet
Layer, top plate and floor rock mechanics parameter, establish mathematical calculation model.
The numerical computations established model of establishing includes this section stope and adjacent goaf, wherein this actual mining
The 1/2 of the not small practical plagioclase of 1/2 area's plagioclase of the not small practical plagioclase of face plagioclase, strike length are not less than 100m, and top plate thickness is not
Less than 20m, base plate thickness is not less than 10m
Step 5: applying corresponding constraint and load on step 4 institute's established model boundary.And stay width along the edge in goaf 6T 1=3m coal columns design geometric dimension according to gob side entry 4 and dig lane.After gob side entry 4 is formed, simulation exploitation working face 5, work
Face 5 is advanced into the First Weighting Interval of Main that step 3 obtainsLWhen, plane where measuring 5 coal wall of working face corresponds to coal column position
Mined out side fracture area 3 thicknessX 1With the thickness of back production side fracture area 1Y 1, calculateX 1+Y 1IfX 1+Y 1≥T 1,Then widen coal
Column recalculates；The width is stayed to be along 6 edge of goaf in step 4 institute established modelT 2=4m coal columns are designed according to gob side entry 4
Geometric dimension digs lane, and after gob side entry 4 is formed, it is first next to be advanced into that step 3 obtains for simulation exploitation working face 5, working face 5
Press step pitchLWhen, plane where measuring 5 coal wall of working face corresponds to the thickness of the mined out side fracture area 3 of coal column positionX 2With return
Adopt the thickness of side fracture area 1Y 2, calculateX 2+Y 2IfX 2+Y 2≥T 2, then widen coal column and recalculate；The rest may be inferred, until work
Plane where 5 coal wall of face corresponds to the thickness of coal column position back production side fracture area 1X nMeet with the thickness of back production side fracture area 3X n+Y n<T nWhen, finally obtain the thickness of the mined out side fracture area of thin coal pillar 3X=X nWith the thickness of back production side fracture area 1Y=Y n。
In the thin coal pillar Width of Plastic Zone determination process, thin coal pillar width takes T successively1=3m, T2=4m ... ..., Tn=（n+
2）m.
Stable region 2 refers to that the part coal body is in stress state before its stress-strain full distance curve peak in the thin coal pillar.
Step 6: according to 4 design section clear height of gob side entryHDetermine the thickness of stable region 2 in thin coal pillart：In thin coal pillar
The thickness of stable region 2tNet section height is designed for gob side entry 4HHalf, i.e.,：t=1/2H。
The thickness of stable region 2 in the thin coal pillartThe minimum thickness of stable region when being working face first weighting.
Back production side fracture area 1 and mined out side fracture area 3 refer to that the part coal body is in its stress-strain in the thin coal pillar
Stress state behind full distance curve peak.
Step 7: a kind of thin coal pillar width of barrier adjacent air space area gas porous flow determines the thin coal pillar rational width of methodTFor the thickness of the mined out side fracture area of coal column 1X, back production side fracture area 3 thicknessYAnd the thickness of middle part stable region 2tThe sum of, i.e.,：
T=t+X+Y。
The specific implementation mode of the present invention is further described in detail below by specific embodiment.
As shown in Fig. 1, by taking certain one height × wide=4m × 5m gob side entry of high methane coal mine as an example, it is adjacent to implement a kind of barrier
The thin coal pillar width of dead zone gas porous flow determines method, determines that method and step is as follows：
Step 1: by the method for drill hole sampling, the coal petrography of collecting work face coal seam, top plate and floor strata at the scene
Sample；Wherein top plate rock sample core taking length 23.25m, bottom plate rock sample core taking length 14.22m, coal seam sample 5m.
Step 2: the coal petrography sample that step 1 obtains is processed into standard rock sample in laboratory, with rock mechanics intensity
Test equipment measures the mechanics parameter of coal petrography sample：Uniaxial compressive strength, uniaxial tensile strength, shearing strength, Poisson's ratio, springform
Amount, cohesive force, internal friction angle, and pass through formulaCalculate coal petrography sample modulus of shearing
In bulk modulus formula,GFor modulus of shearing, unit：MPa；KFor bulk modulus, unit：MPa；E is elasticity modulus, unit：
MPa；μFor Poisson's ratio.
Step 3: the method surveyed using live mine compacting, obtains the First Weighting Interval of Main of working face base object modelL=40m；
Step 4: according to the coal rock layer respective thickness and the obtained coal of step 2 of the offer of working face geology log sheet
Layer, top plate and floor rock mechanics parameter, establish mathematical calculation model, such as attached drawing 2.Model length × width × height=200m × 100m
× 44.51m, wherein the mined out head of district accounts for 100m（Goaf physical length 200m）, this section stope, which is grown, accounts for 100m（Work
Face physical length 200m）, top plate thickness 23.25m, bottom plate thickness 14.22m.
Step 5 and in step 4, institute's established model is forward and backward, left side and right side boundary apply 0 displacement constraint of horizontal direction,
Apply 0 displacement constraint of horizontal and vertical both direction in bottom boundary, applies vertical downward load 7.5MPa in upper bound.
It stays at edge along goaf 6T 1=3m wide coal columns design geometric dimension " height × wide=4m × 5m " according to gob side entry 4
Dig lane.After gob side entry 4 is formed, simulation exploitation working face 5, working face 5 is advanced into the First Weighting Interval of Main that step 3 obtainsL=
40mWhen, plane where measuring 5 coal wall of working face corresponds to the thickness of the mined out side fracture area 3 of coal column positionX 1With back production side
The thickness of fracture area 1Y 1The sum ofX 1+Y 1=3m=T 1, as shown in Fig. 3.Coal column need to be widened to recalculate；
It is stayed along 6 edge of goaf in step 4 institute established modelT 2=4m wide coal columns design dimensioning according to gob side entry 4
Very little " height × wide=4m × 5m " digs lane, and after gob side entry 4 is formed, simulation exploitation working face 5, working face 5 is advanced into step 3 and obtains
First Weighting Interval of MainL=40mWhen, plane where measuring 5 coal wall of working face corresponds to the mined out side fracture area 3 of coal column position
ThicknessX 2With the thickness of back production side fracture area 1Y 2The sum ofX 2+Y 2=4m=T 2, as shown in Fig. 4.Coal column need to be widened to count again
It calculates；
It is stayed successively along 6 edge of goaf in step 4 institute established modelT 3=5m、T 4=6m、T 5=7m、T 6=8m andT 7=9m wide coals
Column, according to gob side entry 4 design geometric dimension " height × wide=4m × 5m " pick lane, working face 5 be advanced into step 3 obtain it is first
Water componentL=40mWhen, plane where measuring 5 coal wall of working face corresponds to the mined out side of this 5 kinds of different in width coal column positions
The thickness of the thickness and back production side fracture area 1 of fracture area 3, calculatesX 3+Y 3=5m=T 3、X 4+Y 4=6m=T 4、
X 5+Y 5=7m=T 5、X 6+Y 6=8m=T 6、X 7+Y 7=9m=T 7.Coal column need to be widened to recalculate；
It is stayed along 6 edge of goaf in step 4 institute established modelT 8=10m wide coal columns design dimensioning according to gob side entry 4
Very little " height × wide=4m × 5m " digs lane, and after gob side entry 4 is formed, simulation exploitation working face 5, working face 5 is advanced into step 3 and obtains
First Weighting Interval of MainL=40mWhen, plane where measuring 5 coal wall of working face corresponds to the mined out side fracture area of coal column position
ThicknessX 8The thickness of=5.5m and back production side fracture areaY 8=2.5m, calculatesX 8+Y 8 =8m<T 8, as shown in Fig. 5.Finally
Obtain the thickness of the mined out side fracture area of thin coal pillar 3X=X nThe thickness of=5.5m and back production side fracture area 1Y=Y n=2.5m。
Step 6: according to 4 design section clear height of gob side entryHDetermine the thickness of stable region 2 in thin coal pillart：In thin coal pillar
The thickness of stable region 2tNet section height is designed for gob side entry 4HHalf, i.e.,：T=1/2H=1/2 × 4m=2m。
Step 7: a kind of thin coal pillar width of barrier adjacent air space area gas porous flow determines the thin coal pillar width of methodTFor
The mined out side fracture area thickness of coal columnX, back production side fracture area thicknessYAnd middle part stable region thicknesstThe sum of, i.e.,：T=t+X+Y=
2m+5.5m+ 2.5=10m。
Following table is roof and floor of the present invention and coal seam mechanics parameter：
Claims (7)
1. a kind of thin coal pillar width of barrier adjacent air space area gas porous flow determines that method, the thin coal pillar width determine that method is to press
What row step carried out：
（One）By drill hole sampling method, the coal petrography sample of collecting work face coal seam, top plate and floor strata at the scene；
（Two）By step（One）The coal petrography sample of acquisition is processed into standard coal rock specimen in laboratory, is set with rock mechanics strength test
The standby mechanics parameter for measuring coal petrography sample；
The coal petrography sample mechanics parameter refer to uniaxial compressive strength, uniaxial tensile strength, shearing strength, Poisson's ratio, elasticity modulus,
Cohesive force, internal friction angle, bulk modulus and modulus of shearing, coal petrography sample modulus of shearing and bulk modulus are by following formula meter
It calculates：
In formula：G- modulus of shearing, MPa；K- bulk modulus, MPa；E-elasticity modulus, MPa；μ- Poisson's ratio；
（Three）Using live mine pressure measurement method, the First Weighting Interval of Main of working face base object model is obtainedL；
（Four）The coal rock layer respective thickness and step provided according to working face geology log sheet（Two）Built coal seam, top plate
And floor rock mechanics parameter, establish mathematical calculation model；
（Five）In step（Four）Institute's established model boundary applies corresponding constraint and load, and along goaf（6）Edge stay widthT 1=
3m coal columns, according to gob side entry（4）It designs geometric dimension and digs lane；Gob side entry（4）After formation, simulation exploitation working face（5）, work
Make face（5）It is advanced into step（Three）Obtain First Weighting Interval of MainLWhen, measure working face（5）Plane where coal wall corresponds to coal column institute
Mined out side fracture area in position（3）ThicknessX 1With back production side fracture area（1）ThicknessY 1, calculateX 1+Y 1If, then widen coal column and recalculate；In step（Four）Along goaf in institute's established model（6）Edge stays the width to beT 2=4m
Coal column, according to gob side entry（4）It designs geometric dimension and digs lane, gob side entry（4）After formation, simulation exploitation working face（5）, work
Face（5）It is advanced into step（3）Obtain First Weighting Interval of MainLWhen, measure working face（5）It is in place that plane where coal wall corresponds to coal column institute
The mined out side fracture area set（3）ThicknessX 2With back production side fracture area（1）ThicknessY 2, calculateX 2+Y 2If,
Then widen coal column to recalculate；The rest may be inferred, until working face（5）It is broken that plane where coal wall corresponds to coal column position back production side
Broken area（1）ThicknessX nWith back production side fracture area（3）Thickness meetWhen, it is broken to finally obtain the mined out side of thin coal pillar
Broken area（3）ThicknessWith back production side fracture area（1）Thickness；
（Six）According to gob side entry（4）Design section clear heightHDetermine stable region in thin coal pillar（2）Thicknesst：Stablize in thin coal pillar
Area（2）ThicknesstFor gob side entry（4）Design net section heightHHalf, i.e.,：；
（Seven）The thin coal pillar width determines the thin coal pillar rational width of methodTIt is the mined out side fracture area of coal column（1）ThicknessX、
Back production side fracture area（3）ThicknessYAnd middle part stable region（2）ThicknesstThe sum of, i.e.,：。
2. the thin coal pillar width of barrier adjacent air space area according to claim 1 gas porous flow determines method, the drill hole sampling
The top plate of method samples total length >=20m, and bottom plate samples total length >=10m, and coal seam samples total length >=3m.
3. the thin coal pillar width of barrier adjacent air space area according to claim 1 gas porous flow determines method, determined thin coal pillar
Interior stable region（2）ThicknesstThe minimum thickness of stable region when being working face first weighting.
4. the thin coal pillar width of barrier adjacent air space area according to claim 1 gas porous flow determines method, institute's established model
It includes this section stope and adjacent goaf to be, wherein this stope plagioclase be >=practical plagioclase 1/2, it is adjacent
The 1/2 of goaf plagioclase >=practical plagioclase, strike length >=100m, top plate thickness >=20m, base plate thickness >=10m.
5. the thin coal pillar width of barrier adjacent air space area according to claim 1 gas porous flow determines method, in the thin coal pillar
Stable region（2）Thin coal pillar width take T successively1=3m, T2=4m ... ..., Tn=（n+2）m.
6. the thin coal pillar width of barrier adjacent air space area according to claim 1 gas porous flow determines method, in the thin coal pillar
Stable region（2）Refer to that the part coal body is in stress state before its stress-strain full distance curve peak.
7. the thin coal pillar width of barrier adjacent air space area according to claim 1 gas porous flow determines method, in the thin coal pillar
Back production side fracture area（1）With mined out side fracture area（3）Refer to that the part coal body is in stress behind its stress-strain full distance curve peak
State.
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| CN108060921B (en) * | 2017-11-30 | 2020-11-24 | 山西工程技术学院 | Thick coal seam gob-side roadway bottom coal recovery method based on narrow coal pillar heave effect |
| CN109441537B (en) * | 2018-10-19 | 2020-12-04 | 中国矿业大学 | Design method for coal mine underground reservoir coal pillar dam body |
| CN110318756B (en) * | 2019-07-18 | 2020-07-31 | 西安科技大学 | Calculation method for narrow coal pillar width of shallow-buried thin bedrock gob-side entry driving |
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| CN111485948B (en) * | 2020-04-10 | 2021-09-17 | 兖矿新疆矿业有限公司硫磺沟煤矿 | Large-dip-angle high-gas coal seam adjacent goaf disaster cooperative prevention and control method |
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| CN104594899A (en) * | 2014-11-24 | 2015-05-06 | 山西潞安环保能源开发股份有限公司 | Method for determining reasonable width of gob-side entrydriving narrow coal pillar |
| CN105787185B (en) * | 2016-02-28 | 2019-02-26 | 西安科技大学 | A kind of best coal column mistake of shallow buried coal seam group working face away from design method |
| CN106545362A (en) * | 2016-09-14 | 2017-03-29 | 辽宁工程技术大学 | A kind of comprehensive determination method for putting gob side entry driving coal column Size of pillar |
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| CN107165633A (en) | 2017-09-15 |
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