CN100356036C - Method for pumping out gas from mining coal layer roof - Google Patents
Method for pumping out gas from mining coal layer roof Download PDFInfo
- Publication number
- CN100356036C CN100356036C CNB031130216A CN03113021A CN100356036C CN 100356036 C CN100356036 C CN 100356036C CN B031130216 A CNB031130216 A CN B031130216A CN 03113021 A CN03113021 A CN 03113021A CN 100356036 C CN100356036 C CN 100356036C
- Authority
- CN
- China
- Prior art keywords
- crack
- gas
- mining
- coal
- top board
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The present invention relates to a method for gas drainage from mining coal layer roofs, which is characterized in that in mining coal layer roofs, for desorption gas collected in an ' annular crack loop ' by crack passages formed by the mining influence of a superincumbent rock layer of an exhausted area from mining and pressure relief coal layers can be pumped out by drilled holes or tunnels arranged in the ' annular crack loop '. The ' annular crack loop ' is positioned in a separation layer crack zone above an exhausted top plate caving zone nearing to a return airway and an intake airway of a coal mining working face. The present invention effectively solves the problem of gas overrun in corners and return air on a stoping working face, and ensures the high efficiency and safety production of the coal mining working face.
Description
Technical field:
The present invention relates to the method for Safety of Coal Mine Production, a kind of method that draws out methane of more specifically saying so.
Background technology:
Huainan Mining Area coal seam, Anhui is composed and is deposited deeply, gas is rich in the coal seam, gas permeability of coal seam is poor.According to statistics, the goaf gas outburst amount accounts for more than 60% of face gas outburst amount.In order to reduce gas emission, the mining area has been adopted with low plate layer-through drilling and has been taken out B in advance
8, C
13Coal-bed gas is main comprehensive discharge method, has obtained some achievements, but because B
8, C
13Gas is rich in the coal seam and original gas permeability of coal seam is poor, makes mine gas pump drainage rate never surpass 15%; Especially at separate zone production C
13During the coal seam, fail the gas about 70% of pump drainage and concentrate and pour in slicing work plane goafs, cause that gas density transfinites in face upper corner angle and the work plane return, the safety that mine is produced in serious threat, coal-face batch (-type) or the mode that reduces daily footage are produced, and influence the producing coal amount of work plane.Along with adopting dark increase, the gas problem will be on the rise.
Summary of the invention:
Technical problem to be solved by this invention is to avoid existing weak point in the above-mentioned prior art, provide a kind of rationally, the effective method of working seam top board gas drainage under suction, with pump drainage gas to greatest extent.
The technical scheme that technical solution problem of the present invention is adopted is:
At the working seam top board, for being subjected to the crack passage of mining influence formation to be pooled to " annular fissure circle " interior desorb gas by the goaf overlying rock from exploitation and pressure released seam, carry out extraction by the boring or the tunnel that are arranged in " annular fissure circle ", described " annular fissure circle " is positioned at coal-face and adopts the above absciss layer fissure zone of sky roof collapse band near return airway and air intake lane.
After coal is exploited out, adopt the coal rock layer that the space will be in original closed state and be divided into a large amount of coal petrography blocks, these coal petrography pieces are surrounded by a large amount of spaces of adopting, and adopt the passage that the space becomes each coal petrography block of contact and work plane atmosphere.Therefore adopting two kinds of spaces that characteristics differ greatly of existence, space, promptly adopt space and original space.Theoretical research shows that mining induced fissure is more much bigger than original air gap characteristics size and permeability.A large amount of mining induced fissures and original space have constituted extremely complicated Gas Flow channel network.From global analysis, mining induced fissure is the central core of circulation of Gas Flow.Form two class cracks in the overlying rock behind the seam mining: a class is the absciss layer crack, and another kind of is vertical disrumpent feelings crack.Wherein, the distribution in absciss layer crack presents two phase characteristics: the phase I, along with the advance of the face, the absciss layer crack constantly increased from open-off cut, and grow most in absciss layer crack, middle part, goaf; Absciss layer crack, middle part, second stage goaf is tending towards compacting, and the absciss layer porosity descends, and absciss layer crack, both sides, goaf still can keep.In top board arbitrary height level, when second stage, the absciss layer crack that is positioned at the middle part, goaf is compacted substantially, and has an absciss layer cranny development district " annular fissure circle " that is communicated with around in the goaf.The existence of " annular fissure circle " for the Gas Flow and the storage of the fissure zone of goaf and overlying rock provides passage and space, is the place that goaf gas is assembled.The present invention utilizes the mining induced fissure " annular fissure circle " of this gathering gas to carry out the extraction of goaf gas just, is to solve the effective drainage method of upper corner gas exceeding limit problem.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention by with extraction boring or roadway arrangement in splitting " annular fissure circle ", this arrangement form is exactly in fact to link up by crack and boring at the top of work plane top board, form passage, under the effect of gas suction pump negative pressure, form very high negative pressure in the passage, a large amount of release desorb gas are drawn out of, and have solved the gas exceeding limit problem in stope upper corner and the return effectively, have guaranteed the safety in production of mine.With the inventive method, the gas density that can extract out reaches 30%～90%.By contrast, if will hole or roadway arrangement in caving zone, the passage that reason boring, tunnel form is very smooth and easy, the gas density of extraction is then very low.If be arranged in the band, because the crack agensis, working space and extraction boring, tunnel do not have the crack to link up, and do not form passage, then can not take out a large amount of gas.
2, gas is the pure fuel of a kind of high-quality, and its concentration is more than 90%, and calorific value and natural gas are suitable, CH
4Destruction to ozone layer is compared CO
2High 16 times, the present invention draws out methane by concentrating, and can further fully utilize it, to reduce the pollution of gas to atmosphere, the protection environment.
3, the inventive method technology simple, have tangible technical advantage and a popularizing application prospect.
Description of drawings:
Accompanying drawing is for moving towards long drilled holes method or the tunnel method schematic diagram that draws out methane in the working seam top board annular fissure circle of the present invention.
The specific embodiment:
The inventive method is at the working seam top board, for being subjected to the crack passage of mining influence formation to be pooled to " annular fissure circle " interior desorb gas by the goaf overlying rock from exploitation and pressure released seam, carry out extraction by the boring or the tunnel that are arranged in " annular fissure circle ", should " annular fissure circle " be positioned at coal-face and adopt the above absciss layer fissure zone of sky roof collapse band near return airway and air intake lane.
In concrete the enforcement, because coal-face generally has certain inclination angle and uses ascensional ventilation, gas will rise floating when gas and air coexistence, if make the extraction boring that is arranged in the overlying rock mining induced fissure band of goaf or extraction tunnel be positioned at " annular fissure circle " by the last air way medial roof plate of work plane side, then extraction is goaf or the release desorb gas that comes from adjacent layer, to solve the gas exceeding limit problem of upper corner.
In order to guarantee the extraction effect, the sealing in boring, tunnel also is the crux place.The joint part of boring or extraction tunnel and extraction pipeline must seal, and must not leak gas.
In concrete the enforcement, the rational position of firedamp taking-out discharging drilling, roadway arrangement at first to consider to satisfy can extraction big, the whole boring of area, tunnel length in all can carry out effective extraction, the concentration that draws out methane is high and reach higher extraction rate.In addition, also need to consider the extraction drill site, the complexity of roadway construction of holing, draw out methane, and avoid the normal actual mining of work plane is caused interference.
Calculate as can be known according to analog material and computer numerical: stope exploitation back exists " annular fissure circle " all around in the goaf, and more near the work plane place, because the rock stratum has just emitted and has fallen, compacting is insufficient, the scope of " annular fissure circle " is bigger, the goaf gas pressure relief is stored in the annular absciss layer or cranny development district of this UNICOM, is equivalent to a gas pocket.Obviously, boring or tunnel being in " annular fissure circle " is the crux of boring or roadway arrangement rational position.
About work plane overlying rock moving characteristic:
By to Huainan Mining Area newly developed area, Anhui (Pan one, Pan Sankuang) C
13-1The B in roof and old liberated area
8Roof rock stratum moving characteristic carries out the equivalent material simulating test respectively and computer numerical simulation calculation draws:
1, equivalent material simulating result of the test
Huainan Mining Area newly developed area C
13-1Roof is a compound roof, by mud stone and in, packsand formed, and directly pushes up propelling with work plane with adopting with emitting.According to the laboratory simulation test result, with adopting with about the about 5m of the direct heights of roofs of inbreak, directly the compound roof of top, top presents absciss layer, and produces cross-section crack, runs through rock crack and extremely grows.The top plate thickness that work plane top cranny development enriches is about 13m.Work plane the place ahead 3m, height 10m scope inside ceiling panel has abundant crack, but the degree of splitting in crack is littler than the degree of splitting in work plane top and top board crack, rear.
In minuent is grown the district based on fracture (vertically) crack of rock stratum; In the district of moderate crack,, but small part absciss layer (laterally) crack is arranged based on fracturation (vertically) crack; In height cranny development district, all very grow in fracture and absciss layer crack.The cranny development district is subjected to two kinds of factor affecting apparent in view, and the one, when work plane was pushed ahead, high, medium and low cranny development district became height cranny development district, and former height crack district will collapse and fall; The 2nd, work as work plane and stop to advance, the crack district also can change, and promptly along with the prolongation of time, height crack district can grow more even emit and fall.In, low crack district has more cranny development and comes out.
Therefore, middle and high degree cranny development district is the optimum position of arranging top board extraction boring.
2, Numerical simulation results
The computer simulation analysis result shows, in a longitudinal direction, along with work plane is pushed ahead, the goaf overlying rock is subjected to mining influence, top board above rib in the certain limit produces the concentration zones of vertical stress and unloads nip, in the roof strata in unloading nip, produce horizontal absciss layer crack and vertical disrumpent feelings crack between the rock stratum and in the layer with certain rule.B
8The coal seam is in recovery process, and the essential characteristic that the crack distributes in the roof strata is: in distance roof vertical distance 16.5m～24m scope, in the 4.5m of rib the place ahead, influenced by the rib supporting, terrane stress is changed significantly, and the crack germinates; Work plane is grown apart from rib 11m scope inside ceiling panel crack; In the 33m scope of goaf, the top board overlying strata fully are subjected to mining influence from work plane, and the absciss layer crack will become and very grow.Subsequently, goaf middle part overlying strata progressively compacting again.The result shows, it is quite similar to adopt sky open-off cut place top rock stratum movement and deformation feature and rib place, and the absciss layer crack is symmetrical distribution with it.On the incline direction of work plane, the about vertically upward 8～25m of last air way, last air way incline direction grow along crack in the direction 0～35m scope of coal seam.Be positioned at around the goaf by numerical simulation visible absciss layer crack district, constituted " the annular fissure circle " of mining induced fissure.
About top board the draw out methane boring and the reasonable Arrangement in tunnel:
The principle of determining the extraction drilling hole amount is: guarantee that gas density in face upper corner angle and the return is in the scope that " colliery safety journey " allows.The factor that the quantity of definite boring should be considered comprises the ability of extraction pump, the resistance of extraction system, resistance, the gas amount that needs extraction and the gas density in the releasing pipe etc. that gas flows in fissure zone.Advise that the boring of a drill site layout is no less than 5, is advisable with 5～10 borings.According to the size of gas emission, also can suitably increase and decrease.
For compound roof, the selection of parameter of the drill holes that draws out methane position is: wrong 3～5m in the air way on the distance, and apart from roof vertical distance 8～25m, along the seam inclination direction apart from last air way 0～30m.
For C
13The coal seam, it is 0～30m with last air way horizontal range that the top board boring that draws out methane is set, top board boring is 8～25m apart from working seam top board vertical distance.For C
13The coal seam, when roadway in the roof and last air way horizontal range were about 8～18m, roadway in the roof was in 10～14m scope apart from working seam top board vertical distance, the extraction best results, promptly roadway in the roof is positioned at the pure gas amount maximum of this " annular fissure circle " extraction.
For B
8Coal seam and overlying strata thereof, it is 23m that draw out methane tunnel and last air way horizontal range of top board is set, roadway in the roof is 16～17m apart from working seam top board vertical distance.For B
8Coal seam and overlying strata layer thereof, when the direct top backwardness that collapses, directly the above top board in top do not collapse fall before, its crack or to produce the more rich height of absciss layer be in 16.5～24m scope.Can find out that according to the gas drainage under suction component analysis in the field trial effect expedition when roadway in the roof and last air way horizontal range were about 23m, roadway in the roof was in 16～17m scope apart from the roof vertical distance, the extraction best results.
Accompanying drawing illustrates and moves towards the principle that long drilled holes method or tunnel method draw out methane in the working seam top board annular fissure circle of the present invention.
Among the figure, 1 is gas drainage, and 2 are extraction for adopting layer, 5 headed by the air intake lane, 4 for return airway, 3 Boring, 6 is round section joint ring.
Claims (3)
1, the method for working seam top board gas drainage under suction, it is characterized in that at the working seam top board, for being subjected to the crack passage of mining influence formation to be pooled to " annular fissure circle " interior desorb gas by the goaf overlying rock from exploitation and pressure released seam, carry out extraction by the boring or the tunnel that are arranged in " annular fissure circle ", described " annular fissure circle " is positioned at coal-face and adopts the above absciss layer fissure zone of sky roof collapse band near return airway and air intake lane.
2, the method for working seam top board according to claim 1 gas drainage under suction, it is characterized in that for compound roof, the selection of parameter of the described drill holes position that draws out methane is: wrong 3～5m in the air way on the distance, apart from the roof vertical distance is 8～25m, along the seam inclination direction apart from last air way 0～30m.
3, the method for working seam top board according to claim 2 gas drainage under suction is characterized in that a drill site layout boring number is no less than 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031130216A CN100356036C (en) | 2003-03-18 | 2003-03-18 | Method for pumping out gas from mining coal layer roof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031130216A CN100356036C (en) | 2003-03-18 | 2003-03-18 | Method for pumping out gas from mining coal layer roof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1532374A CN1532374A (en) | 2004-09-29 |
| CN100356036C true CN100356036C (en) | 2007-12-19 |
Family
ID=34283702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031130216A Expired - Lifetime CN100356036C (en) | 2003-03-18 | 2003-03-18 | Method for pumping out gas from mining coal layer roof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100356036C (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313702C (en) * | 2005-06-02 | 2007-05-02 | 淮南矿业(集团)有限责任公司 | Gas pressure relief method of ground drilling extraction minery and goaf |
| CN101135621B (en) * | 2006-08-30 | 2010-05-12 | 煤炭科学研究总院重庆分院 | Direct rapid measuring method capable of desorbing mash gas content with coal seam |
| CN100462523C (en) * | 2007-06-29 | 2009-02-18 | 淮南矿业(集团)有限责任公司 | Gob-side entry retaining Y-shaped ventilation goaf roof pressure relief gas extraction method |
| CN102207004A (en) * | 2010-03-30 | 2011-10-05 | 淮南矿业(集团)有限责任公司 | Method for carrying out gas control on coal faces |
| CN102094669B (en) * | 2010-12-24 | 2012-11-28 | 中国矿业大学 | Three-dimensional source separated pressure-releasing gas treatment method |
| CN102162367A (en) * | 2011-03-23 | 2011-08-24 | 彬县水帘洞煤炭有限责任公司 | Arrangement method for gas drainage drill sites of highly-gassy fully-mechanized top-coal caving surface |
| CN102251799B (en) * | 2011-06-30 | 2013-08-28 | 中煤科工集团西安研究院 | Method for selecting high-level gas drainage horizon in coal mine |
| CN102392679A (en) * | 2011-11-21 | 2012-03-28 | 大同煤矿集团有限责任公司 | Comprehensive and integrative gas drainage method |
| CN103161492A (en) * | 2011-12-16 | 2013-06-19 | 中国矿业大学(北京) | Gas extraction well location method based on overlying rock fracture shell |
| CN102562088A (en) * | 2012-02-15 | 2012-07-11 | 山西汾西矿业（集团）有限责任公司 | Method for preventing gas from being accumulated at corners on coal faces |
| CN103016047B (en) * | 2012-12-20 | 2015-05-20 | 大同煤矿集团有限责任公司 | Method of draining gas in gob through long drill hole in roof trend on fully mechanized caving face |
| CN104100290B (en) * | 2014-06-19 | 2016-04-13 | 山西晋城无烟煤矿业集团有限责任公司 | The through middle gas preventing and control technique of a kind of coal seam digging laneway |
| CN104763427B (en) * | 2015-02-12 | 2016-11-02 | 太原理工大学 | A kind of supercritical CO2the thick hard difficulty in presplitting colliery collapses the method for top board |
| CN106761902B (en) * | 2016-12-06 | 2018-11-09 | 安徽理工大学 | A kind of stereo synthesis pressure relief gas pumping mining method suitable for soft rock protective coat extracted |
| CN106837408B (en) * | 2017-03-20 | 2018-08-21 | 中国矿业大学 | A kind of coal seam stope advantage gas migration channel staged construction method |
| CN106948859B (en) * | 2017-03-20 | 2018-07-27 | 中国矿业大学 | A kind of networking advantage gas migration channel structure and gas water conservancy diversion pumping method |
| CN107503789B (en) * | 2017-07-31 | 2019-07-02 | 山西晋城无烟煤矿业集团有限责任公司 | Low gaseous mine high-productivity faces gas ground extraction method |
| CN109117589B (en) * | 2018-09-11 | 2022-10-04 | 中煤科工集团重庆研究院有限公司 | Quantitative description method for coal seam roof fracture field |
| CN109488363A (en) * | 2018-11-13 | 2019-03-19 | 辽宁工程技术大学 | A kind of suction road adopts dynamic circuit connector reason method for determining position and device |
| CN109667562B (en) * | 2018-12-19 | 2021-12-07 | 中煤科工集团重庆研究院有限公司 | Mining body gas well up-down combined universe extraction method |
| CN110219592B (en) * | 2019-05-27 | 2022-04-26 | 中国矿业大学(北京) | Three-dimensional networked pressure relief drilling hole arrangement method for realizing sufficient pressure relief of thick coal seam |
| CN110043309B (en) * | 2019-05-29 | 2020-07-28 | 中国煤炭地质总局勘查研究总院 | Arrangement method for closing gas extraction well of coal mine and well body installation method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4321967A (en) * | 1979-07-21 | 1982-03-30 | Maschinenfabrik Korfmann Gmbh | Suction of gases from boreholes in coal mining |
| US4978172A (en) * | 1989-10-26 | 1990-12-18 | Resource Enterprises, Inc. | Gob methane drainage system |
| CN1190693A (en) * | 1998-02-18 | 1998-08-19 | 中国矿业大学（北京校区） | All thickness coal mining method for seam misplaced coal tunnel distribution on thick seam |
-
2003
- 2003-03-18 CN CNB031130216A patent/CN100356036C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4321967A (en) * | 1979-07-21 | 1982-03-30 | Maschinenfabrik Korfmann Gmbh | Suction of gases from boreholes in coal mining |
| US4978172A (en) * | 1989-10-26 | 1990-12-18 | Resource Enterprises, Inc. | Gob methane drainage system |
| CN1190693A (en) * | 1998-02-18 | 1998-08-19 | 中国矿业大学（北京校区） | All thickness coal mining method for seam misplaced coal tunnel distribution on thick seam |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1532374A (en) | 2004-09-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100356036C (en) | Method for pumping out gas from mining coal layer roof | |
| CN100462523C (en) | Gob-side entry retaining Y-shaped ventilation goaf roof pressure relief gas extraction method | |
| CN104514577B (en) | The method of coal seam large area spontaneous combustion in goaf is hidden in a kind of efficient improvement shallow embedding | |
| CN105221179B (en) | A kind of highly gassy mine Y type method of ventilations | |
| CN103758559B (en) | Gob-side entry retaining Y-type ventilation high position return airway hole pumping and mining gas method | |
| CN100356037C (en) | Low premeability high gas soft thick coal layer remote pressure relief gas exhausting method | |
| CN100554642C (en) | A kind of method of long-wall integrated-extraction reclaiming room-type coal column mining | |
| CN107905834A (en) | A kind of hypotonic high prominent coal seam architecture gas production method | |
| CN101251028A (en) | Method for taking out and picking high gassy seam group dislodging gob-side entry retaining Y type ventilated decompression firedamp | |
| CN103670496A (en) | Gob-side entry retaining and sectional coal seam gas pre-extracting method for single low-permeability outburst coal seam | |
| CN105464700B (en) | Fully mechanized mining filling mixed mining working face filling segment length determines method | |
| CN101240715A (en) | One well three-purpose mash gas harnessing method for ground well drilling and ground well drilling | |
| CN106499396B (en) | Medium-thickness slowly-inclined waste rock-containing interlayer ore body room-column mining method | |
| CN104806285A (en) | Coal mine goaf gas control method based on ground horizontal well | |
| CN107559008A (en) | A kind of method combined second mining super high seam and stop adopting line coal column | |
| CN110714760B (en) | Mining method for coal-aluminum symbiotic layered induction collaborative mining | |
| CN111828007A (en) | Stoping method for residual studs in underground mine goaf | |
| CN104895531A (en) | Single thick coal seam ground mining well extraction process | |
| CN102748064A (en) | Large-mining-height fully-mechanized caving face gas control method | |
| CN111022108A (en) | Method for extracting gas in goaf | |
| CN102094671A (en) | Three-dimensional gas extraction method for coal seams with low-permeability and low possibility of gas extraction | |
| CN103557001A (en) | Low-section-height drift-pillar-free shrinkage-stoping, subsequent-filling and mining method | |
| CN100999997A (en) | Method for drawing-out near layer gas of top-coal caving face | |
| CN105971563A (en) | Extraction method for coal bed gas in composite old mined-out area formed through lower tool post method | |
| CN106948860B (en) | Method for extracting coal seam gas based on cooperation of U-shaped well and directional drilling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20040929 Assignee: ViewSonic energy (Fukang) Coal Industry Co.,Ltd. Assignor: National Engineering Research Center for Gas Controlling of Pingan Mine Contract record no.: 2013990000576 Denomination of invention: Method for pumping out gas from mining coal layer roof Granted publication date: 20071219 License type: Common License Record date: 20130911 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20071219 |