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 PDF

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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
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drilling
curtate
spalling
working
static
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CN107701188B (en
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郝兵元
张鹏鹏
黄小朋
任兴云
李志宏
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Taiyuan University of Technology
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Taiyuan University of Technology
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C41/00Methods of underground or surface mining; Layouts therefor
    • E21C41/16Methods of underground mining; Layouts therefor
    • E21C41/18Methods of underground mining; Layouts therefor for brown or hard coal

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

One kind cuts top destressing method for the mined out side static state spalling of gob side entry driving thin coal pillar
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.
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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
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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
CN112096383A (en) * 2020-08-25 2020-12-18 中国矿业大学 Gob-side roadway pulse roof cutting pressure relief method
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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
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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
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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
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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

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