CN107701188A - One kind cuts top destressing method for the mined out side static state spalling of gob side entry driving thin coal pillar - Google Patents
One kind cuts top destressing method for the mined out side static state spalling of gob side entry driving thin coal pillar Download PDFInfo
- Publication number
- CN107701188A CN107701188A CN201711005252.3A CN201711005252A CN107701188A CN 107701188 A CN107701188 A CN 107701188A CN 201711005252 A CN201711005252 A CN 201711005252A CN 107701188 A CN107701188 A CN 107701188A
- Authority
- CN
- China
- Prior art keywords
- drilling
- working face
- spalling
- static
- upper curtate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004901 spalling Methods 0.000 title claims abstract description 78
- 230000003068 static effect Effects 0.000 title claims abstract description 74
- 239000003245 coal Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000005553 drilling Methods 0.000 claims abstract description 96
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 66
- 239000011435 rock Substances 0.000 claims abstract description 41
- 238000007789 sealing Methods 0.000 claims abstract description 37
- 239000002002 slurry Substances 0.000 claims abstract description 31
- 238000000605 extraction Methods 0.000 claims abstract description 21
- 238000007569 slipcasting Methods 0.000 claims abstract description 16
- 238000010276 construction Methods 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims description 51
- 239000004568 cement Substances 0.000 claims description 34
- 239000011440 grout Substances 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 239000011083 cement mortar Substances 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 238000005065 mining Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 229910052681 coesite Inorganic materials 0.000 claims description 4
- 229910052593 corundum Inorganic materials 0.000 claims description 4
- 229910052906 cristobalite Inorganic materials 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 229910052682 stishovite Inorganic materials 0.000 claims description 4
- 229910052905 tridymite Inorganic materials 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 4
- 235000012241 calcium silicate Nutrition 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims 2
- 241001074085 Scophthalmus aquosus Species 0.000 claims 1
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 239000011229 interlayer Substances 0.000 claims 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims 1
- 235000012239 silicon dioxide Nutrition 0.000 claims 1
- 238000009412 basement excavation Methods 0.000 abstract description 4
- 230000008439 repair process Effects 0.000 abstract description 2
- 235000019353 potassium silicate Nutrition 0.000 description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000004880 explosion Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000001727 in vivo Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 208000019901 Anxiety disease Diseases 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000003721 gunpowder Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 230000005074 turgor pressure Effects 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
A kind of to cut top pressure relief method for the mined out side static state spalling of gob side entry driving thin coal pillar, methods described is to determine bore position and drilling relevant parameter spacing, diameter, angle and depth first；Next to that drilling construction, and carry out sealing of hole operation；Static expension-spalling agent slurries slip casting is carried out again, and top release is cut in static spalling, is finally gob side entry driving.The present invention realizes upper curtate working face extraction and tunnels while carry out with lower curtate return airway, effectively alleviate coal mine excavation and be connected nervous problem, after lane escribes top release, gob side entry driving surrouding rock stress environment is greatly improved, during pick lane and tunnel forms rear surrouding rock deformation and greatly reduced, and roadway support quantities is small, repair rate is low.
Description
Technical field
Top pressure relief method is cut for the mined out side static state spalling of gob side entry driving thin coal pillar the present invention relates to one kind, it is especially a kind of
Advanced upper curtate working face, along the axial arranged drilling of top plate and inject static state close to thin coal pillar side in upper curtate return airway
Expension-spalling agent destroys to mined out this top-hung of side base arm configuration, country rock when can effectively alleviate lower curtate return airway gob side entry driving
Stress concentration and surrouding rock deformation control the big method of difficulty.
Background technology
Gob side entry driving is one of my stope of coal mines roadway layout and the technology safeguarded, i.e., is worked face goaf side along upper curtate
Edge, which stays, sets 3 ~ 10m thin coal pillars driving lower curtate return airway, stays and sets thin coal pillar with raising coal recovery rate and isolation
The advantages that goaf gas and toxic and harmful gas.The upper curtate working face extraction such as traditional gob side entry driving, need is completed 4 ~ 6 months
More than, wait overlying strata motion stabilization after, then along mined out area edge tunnel lower curtate return airway, in such cases, upper curtate
The cantilever design of the mined out side base object model of working face can cause that driuing along goaf tunnel-surrounding surrouding rock stress is larger, and tunnel is in the length of service
The problems such as interior rock deformation is big, supporting difficulty is big.
As China widelys popularize " well one side, high-yield and high-efficiency " mine, traditional gob side entry driving mode will certainly cause
The anxiety of excavation replacement, when coal mine excavation linking is relatively nervous, need to be carried out after the completion of upper curtate working face extraction at once under
The driving of section return airway, or while upper curtate working face extraction carry out lower curtate return airway driving,
I.e. lower curtate return airway tunnels under the influence of upper curtate working face extraction dynamic pressure, due to by operated adjacent face goaf base
The fracture rear overhang arm configuration revolution of this top, sinking deformation effect, gob side entry country rock is in high-stress state and deformation is violent, tunnel
It is difficult in maintenance.
For the problem of above-mentioned gob side entry driving surrouding rock deformation is serious, control difficulty is big, by conventional anchor anchor cable to tunnel
Strengthening supporting can not effective deformation controlling for rock surrounding gateways, the mechanics cut off between goaf base object model cantilever rock beam and gob side entry top plate joins
System, it could be concentrated from the basic gob side entry surrouding rock stress that reduces, so as to improve the stability of gob side entry country rock.
Application No. 201210261392.8 " the fender gob side entry driving lane influenceed by dynamic pressure escribe top release side
Method ", " a kind of future small coal pillar gob side entry driving surrounding rock control method " of Application No. 201310167156.4, both the above patent is equal
The branch bearing capacity for reducing gob side entry and thin coal pillar and the purpose for reducing gob side entry surrouding rock deformation, but prior art can be realized
Weak point is：1. above two method uses explosive firepower explosion, and firepower explosion danger is applied greatly, it is necessary to formulate special project
Work technical measures, and it has strict technical requirements in the use of highly gassy mine；2. roof conditions are good, advanced work
Face carries out cutting top explosion, does not take top plate strengthening supporting measure, if advanced explosive distance and explosion timing are improper,
Tunnel inside ceiling panel may be caused to cut in advance, cause roof control difficulty big；When top plate is more broken, borehole enters into goaf
Row explosion, goaf gas concentration is big, and especially upper corner is easier that gas exceeding limit accident occurs, if there is blown-out shot, processing
Difficulty is big, is retained in goaf, it will the safety in production to mine brings very big hidden danger.
Useization is also referred in " one kind control caving shield lane method " of Application No. 200910073961.4, the patent
The big thickness solid rock on the outstanding top in swelling agent expension-spalling agent fracturing goaf is learned, but does not provide corresponding hole arrangement parameters and Specific construction
Technological process.
In summary, prior art mainly using firepower blasting method come cut off goaf base object model cantilever design with along sky
The contact of back, and the production of fiery offerings and have strict limitation using country, in highly gassy mine using can then deposit
In potential safety hazard and there are many restrictions；Though referring to using chemically expansible agent, corresponding hole arrangement parameters and Specific construction are not provided
Technological process, thus propose that a set of cut for the mined out side static state spalling of gob side entry driving thin coal pillar pushes up pressure relief method and Specific construction work
Skill flow, there is important theory and practice significance to improving thin coal pillar gob side entry driving Surrounding Rock Control Theory.
The content of the invention
In order to overcome above-mentioned the shortcomings of the prior art, the present invention provides one kind and is used for the mined out side of gob side entry driving thin coal pillar
Top pressure relief method is cut in static spalling.
To achieve these goals, the present invention adopts the following technical scheme that.
One kind cuts top pressure relief method for the mined out side static state spalling of gob side entry driving thin coal pillar, and methods described is to follow these steps
Carry out：
（1）Bore position and drilling relevant parameter（Spacing, diameter, angle, depth）Determination
Bore position：20 ~ 30m of advanced upper curtate working face（Outside ahead work face supporting section）, in upper curtate return airway
Helped close to thin coal pillar along the axial arranged some groups of drilling of top plate.
The spacing of wells：Static expension-spalling agent caused Fractured zone radius in drilling country rock is pressed
Formula calculates, in formula：--- rock uniaxiality strength, MPa；
--- expension-spalling agent changes over time the caused bulbs of pressure, thus determines to enter the mined out side top plate of thin coal pillar with static expension-spalling agent
The reasonable spacing to be drilled during row side cut top is 2a.
Bore diameter：Chosen by 70 ~ 90mm.
Bore angle：With back horizontal direction angle by 70 ° ~ 90 ° selections.
Drilling depth：Calculated by formula L=KH/sin θ, in formula：H is drilling vertical depth, and θ is bore angle, and K is to be rich
Number, takes 1.1 ~ 1.3；Drilling vertical depth presses H=h1+h2It is determined that h1For immediate roof thickness, h2Base object model thickness.
（2）Drilling construction
Outside upper curtate return airway advance support section, helped close proximity to thin coal pillar, by step（1）In identified drilling phase
Related parameter is drilled obliquely towards upper curtate working face direction, and drilling construction speed is determined according to working face extraction progress, several
Drill as one group, drilling can be divided into powder charge drilling and pilot hole, and powder charge drilling carries out powder charge, pilot hole not powder charge, is oriented to
The presence of drilling changes the stress distribution of powder charge drilled edge so that crack is able to extend, passed through in powder charge drilling line direction
It is logical.
（3）Sealing of hole and powder charge
After the completion of drilling construction, powder charge drilling and sealing and powder charge are carried out, static expension-spalling agent is injected by coal petrography using the method for slip casting
In vivo.
Down tube and the work of first sealing of hole are carried out first, and Grouting Pipe, cement mortar return pipe, static expension-spalling agent return pipe are sent into
In drilling, and each mouth of pipe is fixed at drilling orifice by thin wire.First sealing material selection waterglass-cement mixes thing,
Three pipes are sealed with drilling orifice by waterglass-cement admixture；After waterglass and cement mixing, turn into waterglass-
The main chemical reactions equation of cement dual slurry, waterglass and cement is：3Ca(OH)2+NaO·nSi02+mH20=Ca·
nSi02·mH2The reaction speed of 0+2NaOH, waterglass and cement is faster than hydrated reaction of cement, and it is relative that intensity is generated after reaction
Higher calcium silicates, there is very high bearing capacity, 10min ~ 20min forms intensity, thus the mixed liquor has solidification after hardened
The characteristics of speed is fast, setting strength is high.Drilling on duty is carried out by first sealing of hole operation every hole using this method.
Secondly cement grout secondary hole sealing work is carried out, a check valve is installed additional in the Grouting Pipe mouth of pipe, by pneumatic type biliquid
Grouting pump is connected laggard water-filling mud liquid grout with check valve, until stopping injection cement mortar during cement mortar return pipe mouth of pipe overfall
Liquid.By that analogy, drilling on duty is subjected to secondary hole sealing operation every hole, cement grout is pre-hardening in 1 ~ 3h, in 4 ~ 6h final set and shape
Into intensity.
Static expension-spalling agent slurries slip casting work is finally carried out, continuation on duty in second day is marched forward along upper curtate return airway
Row down tube and sealing of hole work, while static expension-spalling agent slip casting is carried out to the drilling after the previous day sealing of hole（Ensure that cement grout is abundant
Condense, while drilling superficial part crack can be closed）；Static expension-spalling agent is by CaO, MgO, SiO2、Al2O3And Fe2O3Composition, wherein
90% above is CaO, 7 are used by static expension-spalling agent and water：3 ratios note pneumatic type biliquid after grouting pump stirs ladle mixing
Stock pump carries out static expension-spalling agent slurries slip casting after being connected with check valve, until stopping note during static expension-spalling agent return pipe mouth of pipe overfall
Enter static expension-spalling agent slurries, by that analogy, the drilling after the previous day sealing of hole is injected into static expension-spalling agent slurries every hole.
（4）Top release is cut in static spalling
After static expension-spalling agent slurries injection powder charge drilling, growth over time, gradually react simultaneously dilatancy, is being oriented to
Occur running through crack under the guide effect of drilling, between adjacent holes, in the mined out side of upper curtate working face and section thin coal pillar overlying
Structure plane of weakness is formed between base object model rock stratum, after upper curtate working face extraction, mined out this top-hung of side base arm configuration is in mine pressure
In the presence of be caving well.
（5）Gob side entry tunnels
If back production finishes upper curtate working face, cut top work and completed, then can carry out lower curtate return airway immediately
Headwork, it is suffered during lower curtate return airway gob side entry driving because mined out this top-hung of side base arm configuration has been destroyed
Upper curtate working face base object model cantilever design influences smaller, roadway surrounding rock control difficulty reduction, and supporting is relatively easy.
If Linking up digging work is relatively nervous, can be in the same of the mined out lateral incision top release of upper curtate working face thin coal pillar
When, the headwork of lower curtate return airway is carried out, for meeting Ileal neobladder driuing along goaf period, is returned by upper curtate working face
The dramatic impact of space overlying rock is adopted after adopting, in front of working face and rear certain distance produces unstable branch bearing capacity
Stress concentratedarea domain, to reduce the difficulty of roadway maintenance, it need to stop in upper curtate working face mining influence intense regions along empty lane
The driving in road, only carry out upper curtate working face extraction and cut top release work, treat that upper curtate working face extraction exceedes this section of region
Carry out the multiple pick work of gob side entry again afterwards.Due to avoiding upper curtate working face mining influence intense regions, and lower curtate work
During making face crossheading gob side entry driving, mined out this top-hung of side base arm configuration has been destroyed, suffered upper curtate working face extraction dynamic pressure
Smaller, roadway surrounding rock control difficulty reduction is influenceed, supporting is relatively easy.
Above-mentioned one kind cuts top pressure relief method for the mined out side static state spalling of gob side entry driving thin coal pillar, compared with prior art,
Its advantage is：
Gunpowder explosion is instantaneously to carry out, and the static expension-spalling agent reaction time is easily controlled, can be according to face roof nature of ground
And field condition, downhole temperature, face propulsion speed carry out comprehensive selection static state expension-spalling agent type（Divide Quick-type and at a slow speed type）,
It will not react too fast because of static expension-spalling agent and influence back control, also will not be because of the static spalling do not reacted completely
Agent powder charge brings potential safety hazard after drilling into goaf, realizes essential safety；Area has been cut off well by cutting top operation
Section thin coal pillar and the mechanical correlation of the mined out side overlying base object model rock stratum of upper curtate working face, essentially eliminate upper curtate working face and adopt
Dynamic pressure of the empty side overlying base object model rotary deformation on section thin coal pillar and gob side entry influences, and upper curtate working face extraction can be achieved
Carried out simultaneously with lower curtate return airway driving, effectively alleviate coal mine excavation and be connected nervous problem；After lane escribes top release,
Gob side entry driving surrouding rock stress environment is greatly improved, and digs during lane and tunnel forms rear surrouding rock deformation and greatly reduced, lane
Road support engineering amount is small, repair rate is low.
Brief description of the drawings
Fig. 1 is the plan that top destressing method is cut in the mined out side static state spalling of gob side entry driving thin coal pillar of the present invention.
Fig. 2 is I-I cross-sectional view in Fig. 1.
Fig. 3 is II-II cross-sectional view in Fig. 1.
Fig. 4 is schematic diagram after powder charge 8 down tubes of drilling and waterglass-cementing.
Fig. 5 is schematic diagram after the injection cement grout sealing of hole of powder charge drilling 8.
Fig. 6 is schematic diagram after the static expension-spalling agent slurries of injection of powder charge drilling 8.
In figure：1：Upper curtate working face；2：Upper curtate working face haulage gate；3：Upper curtate working face air return way；4：
Goaf；5：Section thin coal pillar；6：Lower curtate working face haulage gate；7：Lower curtate working face；8：Powder charge drills；9：Orientation drill
Hole；10：Directly push up；11：Base object model；12：Check valve；13：Grouting Pipe；14:Static expension-spalling agent return pipe；15：Cement mortar overfall
Pipe；16：Waterglass-cementing mud；17：Cement grout；18：Static expension-spalling agent slurries.
Embodiment
Specific embodiments of the present invention are made further instructions with reference to Fig. 1 ~ Fig. 6.
Above-mentioned the provided one kind of the present invention is provided and cuts top release side for the mined out side static state spalling of gob side entry driving thin coal pillar
Method follows these steps to carry out：
（1）Bore position and drilling relevant parameter（Spacing, diameter, angle, depth）Determination
Bore position：20 ~ 30m of advanced upper curtate working face（Outside ahead work face supporting section）, in upper curtate return airway
Helped close to thin coal pillar along the axial arranged some groups of drilling of top plate.
The spacing of wells：Static expension-spalling agent caused Fractured zone radius in drilling country rock is pressed
Formula calculates, in formula：--- rock uniaxiality strength, MPa；
--- expension-spalling agent changes over time the caused bulbs of pressure, thus determines to enter the mined out side top plate of thin coal pillar with static expension-spalling agent
The reasonable spacing to be drilled during row side cut top is 2a.
Bore diameter：Chosen by 70 ~ 90mm.
Bore angle：With back horizontal direction angle by 70 ° ~ 90 ° selections.
Drilling depth：Calculated by formula L=KH/sin θ, in formula：H is drilling vertical depth, and θ is bore angle, and K is to be rich
Number, takes 1.1 ~ 1.3；Drilling vertical depth presses H=h1+h2It is determined that h1For immediate roof thickness, h2Base object model thickness.
（2）Drilling construction
Outside upper curtate return airway advance support section, helped close proximity to thin coal pillar, by step（1）In identified drilling phase
Related parameter is drilled obliquely towards upper curtate working face direction, and drilling construction speed is determined according to working face extraction progress, several
Drill as one group, drilling can be divided into powder charge drilling and pilot hole, and powder charge drilling carries out powder charge, pilot hole not powder charge, is oriented to
The presence of drilling changes the stress distribution of powder charge drilled edge so that crack is able to extend, passed through in powder charge drilling line direction
It is logical.
（3）Sealing of hole and powder charge
After the completion of drilling construction, powder charge drilling and sealing and powder charge are carried out, static expension-spalling agent is injected by coal petrography using the method for slip casting
In vivo.
Down tube and the work of first sealing of hole are carried out first, and Grouting Pipe, cement mortar return pipe, static expension-spalling agent return pipe are sent into
In drilling, and each mouth of pipe is fixed at drilling orifice by thin wire.First sealing material selection waterglass-cement mixes thing,
Three pipes are sealed with drilling orifice by waterglass-cement admixture；After waterglass and cement mixing, turn into waterglass-
The main chemical reactions equation of cement dual slurry, waterglass and cement is：3Ca(OH)2+NaO·nSi02+mH20=Ca·
nSi02·mH2The reaction speed of 0+2NaOH, waterglass and cement is faster than hydrated reaction of cement, and it is relative that intensity is generated after reaction
Higher calcium silicates, there is very high bearing capacity, 10min ~ 20min forms intensity, thus the mixed liquor has solidification after hardened
The characteristics of speed is fast, setting strength is high.Drilling on duty is carried out by first sealing of hole operation every hole using this method.
Secondly cement grout secondary hole sealing work is carried out, a check valve is installed additional in the Grouting Pipe mouth of pipe, by pneumatic type biliquid
Grouting pump is connected laggard water-filling mud liquid grout with check valve, until stopping injection cement mortar during cement mortar return pipe mouth of pipe overfall
Liquid.By that analogy, drilling on duty is subjected to secondary hole sealing operation every hole, cement grout is pre-hardening in 1 ~ 3h, in 4 ~ 6h final set and shape
Into intensity.
Static expension-spalling agent slurries slip casting work is finally carried out, continuation on duty in second day is marched forward along upper curtate return airway
Row down tube and sealing of hole work, while static expension-spalling agent slip casting is carried out to the drilling after the previous day sealing of hole（Ensure that cement grout is abundant
Condense, while drilling superficial part crack can be closed）；Static expension-spalling agent is by CaO, MgO, SiO2、Al2O3And Fe2O3Composition, wherein
90% above is CaO, 7 are used by static expension-spalling agent and water：3 ratios note pneumatic type biliquid after grouting pump stirs ladle mixing
Stock pump carries out static expension-spalling agent slurries slip casting after being connected with check valve, until stopping note during static expension-spalling agent return pipe mouth of pipe overfall
Enter static expension-spalling agent slurries, by that analogy, the drilling after the previous day sealing of hole is injected into static expension-spalling agent slurries every hole.
（4）Top release is cut in static spalling
After static expension-spalling agent slurries injection powder charge drilling, growth over time, gradually react simultaneously dilatancy, is being oriented to
Occur running through crack under the guide effect of drilling, between adjacent holes, in the mined out side of upper curtate working face and section thin coal pillar overlying
Structure plane of weakness is formed between base object model rock stratum, after upper curtate working face extraction, mined out this top-hung of side base arm configuration is in mine pressure
In the presence of be caving well.
（5）Gob side entry tunnels
If back production finishes upper curtate working face, cut top work and completed, then can carry out lower curtate return airway immediately
Headwork, it is suffered during lower curtate return airway gob side entry driving because mined out this top-hung of side base arm configuration has been destroyed
Upper curtate working face base object model cantilever design influences smaller, roadway surrounding rock control difficulty reduction, and supporting is relatively easy.
If Linking up digging work is relatively nervous, can be in the same of the mined out lateral incision top release of upper curtate working face thin coal pillar
When, the headwork of lower curtate return airway is carried out, for meeting Ileal neobladder driuing along goaf period, is returned by upper curtate working face
The dramatic impact of space overlying rock is adopted after adopting, in front of working face and rear certain distance produces unstable branch bearing capacity
Stress concentratedarea domain, to reduce the difficulty of roadway maintenance, it need to stop in upper curtate working face mining influence intense regions along empty lane
The driving in road, only carry out upper curtate working face extraction and cut top release work, treat that upper curtate working face extraction exceedes this section of region
Carry out the multiple pick work of gob side entry again afterwards.Due to avoiding upper curtate working face mining influence intense regions, and lower curtate work
During making face crossheading gob side entry driving, mined out this top-hung of side base arm configuration has been destroyed, suffered upper curtate working face extraction dynamic pressure
Smaller, roadway surrounding rock control difficulty reduction is influenceed, supporting is relatively easy.
This method is further illustrated below by specific embodiment.
Embodiment 1
Existing No. 15 coal seams of back production of certain ore deposit, No. 15 coal seam average thickness are 3.5m, are directly pushed up（10）For thick 7.0m grey black mud
Rock, base object model（11）For thick 4.0m packsand, in upper curtate working face（1）Arrange upper curtate working face haulage gate（2）
With upper curtate working face air return way（3）Two stope drift active workings, the existing Linking up digging of the ore deposit is nervous, in upper curtate working face（1）Return
Need to carry out lower curtate working face haulage gate while adopting（6）Driving, to ensure in upper curtate working face（1）Back production finishes
Preceding completion lower curtate working face（7）Preparation；To reduce lower curtate working face haulage gate（6）Gob side entry driving Shi Shoushang areas
Section working face（1）The dynamic pressure of back production influences, thus in upper curtate working face air return way（3）Close to section thin coal pillar（5）Push up side
Plate carries out cutting top release work, as shown in Figure 1.
Step 1：In upper curtate working face（1）Outside advance support section, i.e., advanced upper curtate working face（1）25m, along upper area
Section working face air return way（3）Top plate is close to section thin coal pillar（5）1m distances in side are helped to carry out drilling construction operation；According to static swollen
It is 1.1m to split agent and produce turgor pressure force value and its Fractured zone radius size synthesis determination spacing of wells is produced in drilling country rock；Bore
Bore dia chooses 85mm；Boring direction and back horizontal direction angle are 75 °；Drilling vertical depth is 11m, and drilling depth is
13m。
Step 2：The drilling parameter determined by step 1 carries out drilling construction, and 20 drillings of often constructing are divided into one group, every group
Drilling is divided into powder charge drilling（8）And pilot hole（9）, powder charge drilling（8）Inject static expension-spalling agent slurries（18）, pilot hole
（9）Without powder charge.
Step 3：Powder charge drilling is carried out first（8）Down tube and the work of first sealing of hole, using 4 points of plastic round tube, pipe diameter is
20mm, is 3m per sono-explorer, and the plastic round tube can use scissors severing and pass through adapter sleeve spreading, wherein Grouting Pipe（13）It is long
6m, static expension-spalling agent return pipe（14）Long 13m, cement mortar return pipe（15）Long 3m, three pipes are sequentially sent to powder charge drilling（8）
Interior, every pipe drills in powder charge（8）Protruded length is 0.2m, and it is connected into progress with back wire netting by thin wire
It is simple fixed.10kg cement is put in mixing drum, 100mL waterglass liquid and 10 ~ 30s of uniform stirring is poured into every time, wears rubber hand
Set manually pinches mixture shaping, and is drilled in powder charge（8）Aperture carries out sealing of hole, sealed borehole length about 0.3m, the waterglass-cement
Sealing of hole mud（16）5 ~ 8MPa intensity can be produced in 15min, first sealing of hole averagely time-consuming 10min per hole, by that analogy should
Remaining 9 powder charges drilling in group（8）The first sealing of hole of waterglass-cement is carried out respectively, and whole process is as shown in Figure 4.
Secondly powder charge drilling is carried out（8）Cement grout（17）Secondary hole sealing operation, in Grouting Pipe（13）The mouth of pipe installs one additional
Check valve（12）, by pneumatic type Double-liquid mud-injection pump and check valve（12）Connect laggard water-filling slurry liquid（17）Slip casting, grouting pressure
For 2 ~ 3MPa, until cement mortar return pipe（15）Mouth of pipe backwater slurry liquid（17）When stop injection cement grout（17）, cement mortar
Liquid（17）Drilled in powder charge（8）Interior injection length is 2.5m, by that analogy, on duty by the remaining 9 powder charges drilling of the group（8）Respectively
Carry out cement grout（17）Secondary hole sealing, cement used are Portland cement, and its ratio of mud is 0.44, the bar under the mine
Under part, cement grout（17）1.5h pre-hardening, 6h final set, whole process is as shown in Figure 5.
Finally carry out static expension-spalling agent slurries（18）Slip casting operation, second day on duty to continue down tube and sealing of hole work,
The powder charge after the previous day sealing of hole is drilled simultaneously（8）Carry out static expension-spalling agent slurries（18）Slip casting（Powder charge every other day can ensure cement
Slurries fully condense, while can close drilling superficial part crack）；Static expension-spalling agent is by CaO, MgO, SiO2、Al2O3And Fe2O3Group
Into wherein 90% uses 7 above is CaO, by static expension-spalling agent and water：3 ratios, will be pneumatic after grouting pump slip casting ladle mixing
Formula Double-liquid mud-injection pump and check valve（12）Static expension-spalling agent slurries are carried out after connection（18）Slip casting, grouting pressure are 4 ~ 6MPa, directly
To static expension-spalling agent return pipe（14）Stop injecting static expension-spalling agent slurries during mouth of pipe overfall（18）, static expension-spalling agent slurries（18）
Drilled in powder charge（8）Interior injection length is 10m, and by that analogy, the powder charge after the previous day sealing of hole is drilled（8）It is injected separately into static state
Expension-spalling agent slurries（18）, whole process is as shown in Figure 6.
Step 4：As shown in figure 3, growth over time, powder charge drilling after the completion of sealing of hole and powder charge process（8）Interior is quiet
State expension-spalling agent slurries（18）Gradually react simultaneously dilatancy, in pilot hole（9）Guide effect under, go out between adjacent holes
Now run through crack, in upper curtate working face（1）Mined out side and section thin coal pillar（5）Overlying base object model（11）Structure is formed between rock stratum
Plane of weakness, upper curtate working face（1）After back production, mined out side base object model（11）Cantilever design in the presence of mine pressure well
It is caving.
Step 5：Due to Linking up digging work strain, stay and set 10m section thin coal pillars（5）, it is suitable in upper curtate working face return air
Groove（3）Interior edge section thin coal pillar（5）While mined out lateral incision top release, lower curtate working face haulage gate is carried out（6）Driving
Work, to avoid meeting Ileal neobladder driuing along goaf period, by upper curtate working face（1）The play of space overlying rock is adopted after back production
Strong influence, in upper curtate working face（1）Front 100m and rear 100m mining influences intense regions stop lower curtate working face fortune
Defeated crossheading（6）Driving, only carry out upper curtate working face（1）Back production and cut top release work, treat upper curtate working face（1）Back production
Lower curtate working face haulage gate is carried out behind more than this section region again（6）Multiple pick work.Due to avoiding upper curtate working face
（1）Mining influence intense regions, and lower curtate working face haulage gate（6）During gob side entry driving, mined out side base object model（11）
Cantilever design has been destroyed, suffered upper curtate working face（1）Back production dynamic pressure influences smaller, roadway surrounding rock control difficulty reduction,
Supporting is relatively easy.
Claims (1)
1. one kind cuts top pressure relief method for the mined out side static state spalling of gob side entry driving thin coal pillar, it is characterised in that：Methods described is
Follow these steps what is carried out：
（1）The determination of bore position and drill relevant parameter spacing, diameter, angle and depth
Bore position：At 20 ~ 30m of advanced upper curtate working face, helped in upper curtate return airway close to thin coal pillar along top plate
Axial arranged some groups of drilling；
The spacing of wells：Static expension-spalling agent caused Fractured zone radius in drilling country rock is calculated as follows：
In formula：- rock uniaxiality strength, MPa；- expension-spalling agent changes over time the caused bulbs of pressure, thus
Reasonable spacing to be drilled when determining and carrying out side cut top to the mined out side top plate of thin coal pillar with static expension-spalling agent is 2a；
Bore diameter：Chosen by 70 ~ 90mm；
Bore angle：With back horizontal direction angle by 70 ° ~ 90 ° selections；
Drilling depth：Calculated by formula L=KH/sin θ, in formula：H is drilling vertical depth, and θ is bore angle, and K is surplus coefficiert, is taken
1.1~1.3；Drilling vertical depth presses H=h1+h2It is determined that h1For immediate roof thickness, h2Base object model thickness；
（2）Drilling construction
Outside upper curtate return airway advance support section, helped close to thin coal pillar, by step（1）Identified drilling parameter is upward
Section working face direction, oblique brill powder charge drilling and pilot hole, if using dry hole as one group, powder charge drilling carries out powder charge, leads
Change the stress distribution of powder charge drilled edge to drilling, enable crack in the extension insertion of powder charge drilling line direction；
（3）Sealing of hole and powder charge
After drilling construction, powder charge drilling and sealing and powder charge are carried out, is injected static expension-spalling agent in coal and rock using grouting method；
Down tube and first sealing of hole are carried out first, and Grouting Pipe, cement mortar return pipe, static expension-spalling agent return pipe are sent into drilling,
And each mouth of pipe is fixed at drilling orifice, three pipes are sealed with drilling orifice by waterglass-cement admixture, 10min ~
Calcium silicates is generated after 20min, realizes first sealing of hole operation；
Secondly cement grout secondary hole sealing is carried out, a check valve is installed additional in the Grouting Pipe mouth of pipe, by pneumatic type Double-liquid mud-injection pump and list
Laggard water-filling mud liquid grout is connected to valve, until stopping injection during cement mortar return pipe mouth of pipe overfall, cement grout is at the beginning of 1 ~ 3h
It is solidifying, in 4 ~ 6h final set；
Finally static expension-spalling agent slurries slip casting is carried out every other day, static expension-spalling agent is made up of CaO, MgO, SiO2, Al2O3 and Fe2O3,
Wherein 90% above is CaO, uses 7: 3 ratios after grouting pump stirs ladle mixing, by pneumatic type pair by static expension-spalling agent and water
Liquid grout pump carries out static expension-spalling agent slurries slip casting after being connected with check valve, until stopping during static expension-spalling agent return pipe mouth of pipe overfall
Static expension-spalling agent slurries are only injected, by that analogy, static expension-spalling agent slurries are injected into the drilling after preceding 24 hours sealing of holes；
（4）Top release is cut in static spalling
After static expension-spalling agent slurries injection powder charge drilling, with the extension of time, the simultaneously dilatancy that gradually reacts, is being oriented to
In the presence of drilling, occur running through crack between adjacent two drilling, in the mined out side of upper curtate working face and section thin coal pillar overlying base
This rimrock interlayer forms structure plane of weakness, and after upper curtate working face extraction, mined out this top-hung of side base arm configuration is in mine pressure
It is caving under effect；
（5）Gob side entry tunnels
If back production finishes upper curtate working face, cut top work and completed, then can carry out lower curtate return airway immediately
Headwork, it is suffered during lower curtate return airway gob side entry driving because mined out this top-hung of side base arm configuration has been destroyed
Upper curtate working face base object model cantilever design influences smaller, roadway surrounding rock control difficulty reduction, and supporting is relatively easy；
If Linking up digging work is relatively nervous, while the mined out lateral incision top release of upper curtate working face thin coal pillar, carry out down
The headwork of section return airway, for meeting Ileal neobladder driuing along goaf period, adopted by after upper curtate working face extraction
Space overburden effects, in front of working face and rear certain distance produces unstable supporting pressure stresses areas of elevated,
To reduce the difficulty of roadway maintenance, the driving of gob side entry need to be stopped in upper curtate working face mining influence region, only carried out
Section working face extraction and cut top release work, after upper curtate working face extraction exceed this section of region after carry out gob side entry again
Work is dug again, due to avoiding upper curtate working face mining influence region, and during lower curtate return airway gob side entry driving,
Mined out this top-hung of side base arm configuration has been destroyed, and suffered upper curtate working face extraction dynamic pressure influences smaller, roadway surrounding rock control
Difficulty reduces, and supporting is relatively easy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711005252.3A CN107701188B (en) | 2017-10-25 | 2017-10-25 | One kind cutting top destressing method for the mined out side static state spalling of gob side entry driving thin coal pillar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711005252.3A CN107701188B (en) | 2017-10-25 | 2017-10-25 | One kind cutting top destressing method for the mined out side static state spalling of gob side entry driving thin coal pillar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107701188A true CN107701188A (en) | 2018-02-16 |
| CN107701188B CN107701188B (en) | 2019-02-26 |
Family
ID=61182704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711005252.3A Active CN107701188B (en) | 2017-10-25 | 2017-10-25 | One kind cutting top destressing method for the mined out side static state spalling of gob side entry driving thin coal pillar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107701188B (en) |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108661641A (en) * | 2018-04-03 | 2018-10-16 | 天地科技股份有限公司 | A method of preventing crossheading goaf top outstanding over long distances based on top release is cut |
| CN108801088A (en) * | 2018-06-05 | 2018-11-13 | 太原理工大学 | A kind of static expension-spalling agent broken rock method of powder stick form |
| CN109139020A (en) * | 2018-09-12 | 2019-01-04 | 南华大学 | A kind of underground chamber quiet pop in rock burst area digs branch's unloading method |
| CN109973126A (en) * | 2019-03-26 | 2019-07-05 | 中国矿业大学(北京) | The double release constant resistance supporting surrounding rock stability control methods of fender gob side entry driving |
| CN110939466A (en) * | 2019-12-13 | 2020-03-31 | 贵州大学 | Pier stud non-blasting roof cutting gob-side entry driving method |
| CN111364995A (en) * | 2020-03-26 | 2020-07-03 | 中国矿业大学(北京) | Construction method of fully mechanized caving coal roadway stable roof-coal pillar structure |
| CN111946344A (en) * | 2020-08-20 | 2020-11-17 | 山西汇和盛科技有限公司 | Method for moving pressure protection of gob-side roadway and coal pillar by longwall mining spanning structure |
| CN112031775A (en) * | 2020-09-11 | 2020-12-04 | 陈卫军 | Novel coal mine rock burst treatment method |
| CN112096383A (en) * | 2020-08-25 | 2020-12-18 | 中国矿业大学 | Gob-side roadway pulse roof cutting pressure relief method |
| CN112096385A (en) * | 2019-06-02 | 2020-12-18 | 南京梅山冶金发展有限公司 | Natural caving mining method for static cracking and crushing of thick and large metal ore body |
| CN112096382A (en) * | 2020-08-25 | 2020-12-18 | 中国矿业大学 | Advanced grouting reinforcement method for narrow coal pillars of gob-side roadway |
| CN112267879A (en) * | 2020-10-22 | 2021-01-26 | 山西工程技术学院 | Method for determining grouting pressure of gas drilling and sealing |
| CN112727461A (en) * | 2021-01-04 | 2021-04-30 | 天地科技股份有限公司 | Gob-side roadway mining stress superposition control method |
| CN113266355A (en) * | 2021-05-31 | 2021-08-17 | 中煤科工开采研究院有限公司 | Gob-side entry driving method |
| CN114233298A (en) * | 2021-12-26 | 2022-03-25 | 太原理工大学 | Underground empty roadway passing method, slurry and roadway |
| CN115182729A (en) * | 2022-08-02 | 2022-10-14 | 安徽理工大学 | Inclined coal seam small coal pillar penetrating deep cutting shallow pouring gangue blocking roadway protection technology and top cutting position determination method |
| CN116464444A (en) * | 2023-03-23 | 2023-07-21 | 中国矿业大学(北京) | Mechanical non-blasting net surface drilling expansion roof cutting pressure relief device and method |
| CN116816436A (en) * | 2023-07-04 | 2023-09-29 | 安徽理工大学 | Stable control method suitable for narrow coal pillar gob-side entry driving surrounding rock |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103953348A (en) * | 2014-05-13 | 2014-07-30 | 中国矿业大学 | Method for controlling carrier plate by cooperative utilization of goaf coal gangue of large dip angle/sharply inclined coal seam |
| CN104632219A (en) * | 2015-01-14 | 2015-05-20 | 中国矿业大学 | Large mining height gob-side entry retaining method for thick coal seams |
| CN104790954A (en) * | 2015-03-27 | 2015-07-22 | 黑龙江科技大学 | Roadside packing gob-side entry retaining top-cutting explosion pressure relief method |
| CN105156110A (en) * | 2015-07-03 | 2015-12-16 | 陕西煤业化工技术研究院有限责任公司 | Dynamic disaster mine district roadway structure and method for developing same |
| CN107035405A (en) * | 2016-12-06 | 2017-08-11 | 太原理工大学 | One kind is used for the double filling wall constructions of gob side entry retaining and cuts top pressure relief method |
| CN107035370A (en) * | 2017-05-05 | 2017-08-11 | 太原理工大学 | One kind cuts top pressure relief method for gob side entry retaining static crushing |
-
2017
- 2017-10-25 CN CN201711005252.3A patent/CN107701188B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103953348A (en) * | 2014-05-13 | 2014-07-30 | 中国矿业大学 | Method for controlling carrier plate by cooperative utilization of goaf coal gangue of large dip angle/sharply inclined coal seam |
| CN104632219A (en) * | 2015-01-14 | 2015-05-20 | 中国矿业大学 | Large mining height gob-side entry retaining method for thick coal seams |
| CN104790954A (en) * | 2015-03-27 | 2015-07-22 | 黑龙江科技大学 | Roadside packing gob-side entry retaining top-cutting explosion pressure relief method |
| CN105156110A (en) * | 2015-07-03 | 2015-12-16 | 陕西煤业化工技术研究院有限责任公司 | Dynamic disaster mine district roadway structure and method for developing same |
| CN107035405A (en) * | 2016-12-06 | 2017-08-11 | 太原理工大学 | One kind is used for the double filling wall constructions of gob side entry retaining and cuts top pressure relief method |
| CN107035370A (en) * | 2017-05-05 | 2017-08-11 | 太原理工大学 | One kind cuts top pressure relief method for gob side entry retaining static crushing |
Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108661641A (en) * | 2018-04-03 | 2018-10-16 | 天地科技股份有限公司 | A method of preventing crossheading goaf top outstanding over long distances based on top release is cut |
| CN108801088A (en) * | 2018-06-05 | 2018-11-13 | 太原理工大学 | A kind of static expension-spalling agent broken rock method of powder stick form |
| CN109139020A (en) * | 2018-09-12 | 2019-01-04 | 南华大学 | A kind of underground chamber quiet pop in rock burst area digs branch's unloading method |
| CN109973126A (en) * | 2019-03-26 | 2019-07-05 | 中国矿业大学(北京) | The double release constant resistance supporting surrounding rock stability control methods of fender gob side entry driving |
| CN112096385A (en) * | 2019-06-02 | 2020-12-18 | 南京梅山冶金发展有限公司 | Natural caving mining method for static cracking and crushing of thick and large metal ore body |
| CN110939466A (en) * | 2019-12-13 | 2020-03-31 | 贵州大学 | Pier stud non-blasting roof cutting gob-side entry driving method |
| CN110939466B (en) * | 2019-12-13 | 2021-05-14 | 贵州大学 | Pier stud non-blasting roof cutting gob-side entry driving method |
| CN111364995A (en) * | 2020-03-26 | 2020-07-03 | 中国矿业大学(北京) | Construction method of fully mechanized caving coal roadway stable roof-coal pillar structure |
| CN111364995B (en) * | 2020-03-26 | 2021-02-12 | 中国矿业大学(北京) | Construction method of fully mechanized caving coal roadway stable roof-coal pillar structure |
| CN111946344A (en) * | 2020-08-20 | 2020-11-17 | 山西汇和盛科技有限公司 | Method for moving pressure protection of gob-side roadway and coal pillar by longwall mining spanning structure |
| CN112096383A (en) * | 2020-08-25 | 2020-12-18 | 中国矿业大学 | Gob-side roadway pulse roof cutting pressure relief method |
| CN112096383B (en) * | 2020-08-25 | 2021-09-24 | 中国矿业大学 | Gob-side roadway pulse roof cutting pressure relief method |
| CN112096382B (en) * | 2020-08-25 | 2021-09-24 | 中国矿业大学 | Advanced grouting reinforcement method for narrow coal pillars of gob-side roadway |
| CN112096382A (en) * | 2020-08-25 | 2020-12-18 | 中国矿业大学 | Advanced grouting reinforcement method for narrow coal pillars of gob-side roadway |
| CN112031775A (en) * | 2020-09-11 | 2020-12-04 | 陈卫军 | Novel coal mine rock burst treatment method |
| CN112031775B (en) * | 2020-09-11 | 2022-05-03 | 陈卫军 | Novel coal mine rock burst treatment method |
| CN112267879B (en) * | 2020-10-22 | 2022-09-27 | 山西工程技术学院 | Method for determining grouting pressure of gas drilling and sealing |
| CN112267879A (en) * | 2020-10-22 | 2021-01-26 | 山西工程技术学院 | Method for determining grouting pressure of gas drilling and sealing |
| CN112727461A (en) * | 2021-01-04 | 2021-04-30 | 天地科技股份有限公司 | Gob-side roadway mining stress superposition control method |
| CN113266355A (en) * | 2021-05-31 | 2021-08-17 | 中煤科工开采研究院有限公司 | Gob-side entry driving method |
| CN114233298A (en) * | 2021-12-26 | 2022-03-25 | 太原理工大学 | Underground empty roadway passing method, slurry and roadway |
| CN114233298B (en) * | 2021-12-26 | 2023-09-19 | 太原理工大学 | Underground gob-side entry passing method, slurry and tunnel |
| CN115182729A (en) * | 2022-08-02 | 2022-10-14 | 安徽理工大学 | Inclined coal seam small coal pillar penetrating deep cutting shallow pouring gangue blocking roadway protection technology and top cutting position determination method |
| CN115182729B (en) * | 2022-08-02 | 2023-03-21 | 安徽理工大学 | Inclined coal seam small coal pillar penetrating deep cutting shallow pouring gangue blocking roadway protection technology and top cutting position determination method |
| CN116464444A (en) * | 2023-03-23 | 2023-07-21 | 中国矿业大学(北京) | Mechanical non-blasting net surface drilling expansion roof cutting pressure relief device and method |
| CN116464444B (en) * | 2023-03-23 | 2024-01-19 | 中国矿业大学(北京) | Mechanical non-blasting net surface drilling expansion roof cutting pressure relief method |
| CN116816436A (en) * | 2023-07-04 | 2023-09-29 | 安徽理工大学 | Stable control method suitable for narrow coal pillar gob-side entry driving surrounding rock |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107701188B (en) | 2019-02-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107701188B (en) | One kind cutting top destressing method for the mined out side static state spalling of gob side entry driving thin coal pillar | |
| CN108518222B (en) | Paste body filling combination top plate presplitting second mining super high seam stops the method for adopting line coal column | |
| CN112031775B (en) | Novel coal mine rock burst treatment method | |
| CN103821558B (en) | Coal mine gob filling mining and gob side entry retaining filling process | |
| CN104533418B (en) | A kind of underground coal mine deep hole static(al) that is used for breaks rock dust | |
| CN103334770B (en) | One is grown up reverse-slope tunnel ultra high water pressure rich water zone of fracture construction method | |
| CN107060760A (en) | A kind of method that colliery withdraws tunnel presplit blasting caving release | |
| CN103835729A (en) | Ground pre-grouting strengthening technology for deep long-distance roadway surrounding rock | |
| CN102287198A (en) | Construction method for river-crossing shield tunnel crushed stratum communication channel | |
| CN103089276B (en) | Deep-shallow hole and high-low pressure coupling grouting technology | |
| CN104481540A (en) | Method for controlling multiple coal mining hazards by high level borehole grouting | |
| CN106050185B (en) | A kind of coal mining bottom plate meets the control method that tomography produces water inrush channel | |
| CN113202475B (en) | Filling caving mining method | |
| CN102425439A (en) | Method for reinforcing bidirectional staged stretched anchor cable of preset steel strand | |
| CN110685688B (en) | Coal mine surrounding rock control method based on chemical modification | |
| CN104763434A (en) | Non-coal-pillar double tunneling method | |
| CN1865660A (en) | Construction method for weakening zone of floor plate wall rock | |
| CN114472462B (en) | Underground-aboveground linkage coal gangue disposal system and disposal method | |
| CN113187486A (en) | Gob-side entry driving method for deep well without coal pillar and formed entry | |
| Yang et al. | Application cumulative tensile explosions for roof cutting in Chinese underground coal mines | |
| CN104912588B (en) | Spalling permeability increasing method for rapid excavation of underground seam gateway | |
| CN106884660A (en) | A kind of method that protection pillar base angle presplit blasting release controls roadway deformation | |
| CN106285777B (en) | The method that flood mine mineral building discharges water in advance | |
| CN112174616B (en) | Underground consolidation material and method for loose coal rock mass in small kiln damage area | |
| CN109488340A (en) | Advanced pouch pre-pouring grout passes rapidly through the construction method in high prominent down-hole goaf |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |