CN103089269B - Method for cutting and pre-breaking top coal to improve mining efficiency by utilizing water power - Google Patents
Method for cutting and pre-breaking top coal to improve mining efficiency by utilizing water power Download PDFInfo
- Publication number
- CN103089269B CN103089269B CN201310024083.3A CN201310024083A CN103089269B CN 103089269 B CN103089269 B CN 103089269B CN 201310024083 A CN201310024083 A CN 201310024083A CN 103089269 B CN103089269 B CN 103089269B
- Authority
- CN
- China
- Prior art keywords
- coal
- pressure water
- waterpower
- mining
- advance borehole
- 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 - Fee Related
Links
- 239000003245 coal Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000005065 mining Methods 0.000 title claims abstract description 24
- 239000011435 rock Substances 0.000 claims abstract description 11
- 238000005553 drilling Methods 0.000 claims abstract description 5
- 238000010276 construction Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 230000032683 aging Effects 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 206010006895 Cachexia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 208000016318 wasting Diseases 0.000 description 1
- 238000013316 zoning Methods 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention relates to a method for cutting and pre-breaking top coal to improve mining efficiency by utilizing water power, which solves the problem that a relatively hard and complete roof coal seam, particularly a coal seam tightly attached to an upper rock body, is difficult for top coal caving, large in coal falling lumpiness and not high in mining efficiency. The method comprises the following steps of: drilling advanced boreholes in a roof coal body to a coal rock boundary surface on a mining working surface by utilizing a drilling machine; extending a high-pressure water pipe in the boreholes; and cutting a plurality of subhorizontal semicircular transverse slots by utilizing the impact force of high-pressure water from top to bottom in the top coal. A plurality of yielding regions are formed by the boreholes in linear distribution in the roof coal body, the mechanical conditions in the coal body are changed, the hard and complete coal body is promoted to be deformed and broken under the effect of advanced concentrated stress, and a plurality of cracks are generated; the coal-rock and coal-coal contact areas are reduced through the transverse slots, and the coal body on the boundary surface is further extruded under the effect of roof high stress, so that the coal body is broken, the adhesive power is lost, manual layering is achieved, and coal is convenient to fall. The method is simple and quick, high in operability and good in timeliness, the coal mining speed can be efficiently increased, and the mining efficiency of the top coal is improved.
Description
Technical field
The present invention relates to a kind of method improving coal mining rate, especially a kind of method utilizing waterpower to cut pre-broken top coal raising coefficient of mining.
Background technology
Top coal caving method has been widely used since 70 ~ eighties of 20th century occurs, greatly reduces labour intensity, improves the operating efficiency of coal mining.But this technology is in application process, to part coal seam, as comparatively hard in ature of coal, the good coal seam of integrality, often also exists top coal and is difficult to the problem that complete let-down, coal breakage lumpiness are comparatively large, coefficient of mining is not high, cause a large amount of wastings of resources.For this problem, domestic and international scientific worker proposes many methods and solves, the methods such as softening in water filling, high pressure water injection fracturing, dark (shallow) explosion.These methods reduce top coal let-down difficulty to a certain extent, improve top coal caving rate, but these method ubiquities the problem that construction is comparatively complicated, work progress exists potential safety hazard, have limitation in application simultaneously.As water filling softening method and high pressure water injection fracturing method the water filling sealing of hole measure that adopts be difficult to realize on top board, and caving validity, ageing very poor; Deeply (shallow) hole blasting method the coal body generally run in coal mining and rock mass are close in girdle, not only in constructing operation, difficulty is larger, and breaking of roof rock mass can be caused, a large amount of rock impurity is there is in coal breakage, and the stability of heavy damage top board, form potential safety hazard.So be necessary for this project difficult problem, proposition science, convenience, meet the method for engineering mechanics rule, effectively pre-broken top coal, reduces let-down difficulty, improves top coal caving rate.
Summary of the invention
Technical problem: the object of the invention is for comparatively hard, the good top board coal seam of integrality, particularly for the coal seam Sub-Level Caving difficulty be close to top rock mass, problem that coefficient of mining is not high, provide a kind of construct simple, ageing good, safe, effectively improve the coal-mining method of pushing up coal mining rate.
Technical scheme: the present invention utilizes waterpower to cut the method for pre-broken top coal raising coefficient of mining, comprises the steps:
A, with beating the interface of advance borehole to coal body and rock stratum in the top board coal body of rig before hydraulic support;
B, extract drilling rod, high-pressure water pipe front end being provided with high-pressure nozzle stretches into bottom advance borehole, open valve, high-pressure water jet transversely carries out waterpower cutting by the pressure set and flow to coal body, and uniform rotation high-pressure water pipe, make high-pressure water jet in coal body, cut out semicircular horizontal slot along digging direction, rotate high-pressure water pipe back and forth, make the horizontal slot cut out reach design radial;
C, the high-pressure nozzle stretched in advance borehole is moved down a segment distance, continue that hydraulic slotted liner technique is carried out to coal body and reach design radial, repeat waterpower cutting repeatedly, in advance borehole, cut out multiple horizontal slot from top to bottom;
D, repeat step a, b, c, in the top board coal body on coal-face, to construct multiple advance borehole by setting spacing along coal-face, and utilize waterpower in each boring, cut out multiple horizontal slot;
E, carrying out along with Sub-Level Caving construction, to move forward hydraulic support by step pitch, and with this step pitch for array pitch, arrange next row advance borehole.
The step pitch of described hydraulic support movement is 1000mm ~ 1500mm; The spacing of described advance borehole is 1000mm ~ 1500mm, and diameter is 150mm ~ 200mm, and hole to digging direction, inclination angle is 60 ° ~ 80 °; The vertical spacing of described horizontal slot (7) is 300mm ~ 500mm, and thickness is 10mm ~ 20mm, and radius is 500mm ~ 750mm; Described high-pressure water jet pressure is 20MPa ~ 30MPa, and flow is 50 ~ 70L/min.
Beneficial effect: the present invention not only effectively can improve the top coal mining rate in hard, complete coal seam, reduces the lumpiness of coal breakage, accelerate exploitation rate, and it is simple and convenient, safe, ageing good to construct.One aspect of the present invention defines numerous nips that allows in top board coal body, changes the mechanical condition in coal body, promotes hard and superhigh seam deformation fracture under the effect of advanced concentrated stress, produces crack crisscross in a large number; On the other hand, horizontal slot reduces the contact area of coal petrography, coal coal, and under the heavily stressed effect of top board, the coal body extruded on interface makes it broken further, loses cementability, achieves manual zoning, be convenient to coal breakage.Advanced cutting broken piecemeal has in advance been carried out in top board coal seam by boring, horizontal slot and secondary a large amount of cracks, be convenient to top coal be caving under Gravitative Loads, decrease because top coal cannot normally let-down and the resources loss that causes, and the lumpiness of reduction coal breakage can avoid the damage of bulk coal breakage to hydraulic support and the blocking to coal discharge outlet.The method effectively can solve the difficult problem that hard, complete top coal is difficult to let-down, substantially increases top coal mining rate and exploitation construction speed.
Accompanying drawing explanation
Fig. 1 is enforcement arrangement diagram of the present invention.
Fig. 2 is the sectional drawing of in Fig. 1 I-I.
In figure: 1-hydraulic support, 2-coal body, 3-advance borehole, 4-rock stratum, 5-high-pressure nozzle, 6-high-pressure water pipe; The horizontal slot of 7-.
Detailed description of the invention
As shown in drawings: the operating procedure that the present invention utilizes waterpower to cut pre-broken top coal raising coefficient of mining method is:
1. the interface beating advance borehole 3 to coal body 2 and rock stratum 4 in the top board coal body 2 of rig before hydraulic support 1 is used;
2. drilling rod is extracted, the high-pressure water pipe 6 front end being provided with high-pressure nozzle 5 stretches into bottom advance borehole 3, open valve, make that high-pressure water jet take pressure as 20MPa ~ 30MPa, flow is that 50 ~ 70L/min transversely carries out waterpower cutting to coal body 2, and uniform rotation high-pressure water pipe 6, make high-pressure water jet in coal body 2, cut out semicircular horizontal slot 7 along digging direction, rotate high-pressure water pipe 6 back and forth, make the horizontal slot 7 cut out reach design radial;
3. the high-pressure nozzle 5 stretched in advance borehole 3 is moved down setpoint distance, continue that hydraulic slotted liner technique is carried out to coal body 2 and reach design radial, repeat waterpower cutting repeatedly, in advance borehole 3, cut out multiple horizontal slot 7 from top to bottom; The vertical spacing of described horizontal slot 7 is 300mm ~ 500mm, and thickness is 10mm ~ 20mm, and radius is 500mm ~ 750mm; Utilize high-pressure water jet when cutting horizontal slot 7, each horizontal slot 7 required time is about 5min ~ 10min, and reciprocal uniform rotation high-pressure nozzle 5 ~ 20 round trip;
4. repeat step 1., 2., 3., in the top board coal body 2 on coal-face, to construct multiple advance borehole 3 to set spacing along coal-face, and utilize waterpower in each boring, cut out multiple horizontal slot 7;
5. along with the carrying out of Sub-Level Caving construction, by the step pitch of 1000mm ~ 1500mm, hydraulic support 1 is moved forward, and with this step pitch for array pitch, arrange next row advance borehole 3, the spacing of advance borehole 3 is 1000mm ~ 1500mm, diameter is 150mm ~ 200mm, and hole to digging direction, inclination angle is 60 ° ~ 80 °.
Claims (5)
1. utilize waterpower to cut a method for pre-broken top coal raising coefficient of mining, it is characterized in that, comprise the steps:
A, in the front top board coal body (2) of hydraulic support (1), to beat the interface of advance borehole (3) to coal body (2) and rock stratum (4) with rig, advance borehole (3) is to the inclination of digging direction, and inclination angle is 60 ° ~ 80 °;
B, extract drilling rod, the high-pressure water pipe (6) front end being provided with high-pressure nozzle (5) stretches into advance borehole (3) bottom, open valve, high-pressure water jet transversely carries out waterpower cutting by the pressure set and flow to coal body (2), and uniform rotation high-pressure water pipe (6), make high-pressure water jet in coal body (2), cut out semicircular horizontal slot (7) along digging direction, rotate high-pressure water pipe (6) back and forth, make the horizontal slot (7) cut out reach design radial;
C, the high-pressure nozzle (5) stretched in advance borehole (3) is moved down setpoint distance, continue that hydraulic slotted liner technique is carried out to coal body (2) and reach design radial, repeat waterpower cutting repeatedly, in advance borehole (3), cut out multiple horizontal slot (7) from top to bottom;
D, repeat step a, b, c, in the top board coal body (2) on coal-face, to construct multiple advance borehole (3) by setting spacing along coal-face, and utilize waterpower in each boring, cut out multiple horizontal slot (7);
E, carrying out along with Sub-Level Caving construction, to move forward hydraulic support (1) by step pitch, and with this step pitch for array pitch, arrange next row advance borehole (3).
2. the method utilizing waterpower to cut pre-broken top coal raising coefficient of mining according to claim 1, is characterized in that: the step pitch of described hydraulic support (1) movement is 1000mm ~ 1500mm.
3. the method utilizing waterpower to cut pre-broken top coal raising coefficient of mining according to claim 1, is characterized in that: the spacing of described advance borehole (3) is 1000mm ~ 1500mm, and diameter is 150mm ~ 200mm.
4. the method utilizing waterpower to cut pre-broken top coal raising coefficient of mining according to claim 1, is characterized in that: the vertical spacing of described horizontal slot (7) is 300mm ~ 500mm, and thickness is 10mm ~ 20mm, and radius is 500mm ~ 750mm.
5. the method utilizing waterpower to cut pre-broken top coal raising coefficient of mining according to claim 1, it is characterized in that: described high-pressure water jet pressure is 20MPa ~ 30MPa, flow is 50 ~ 70L/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310024083.3A CN103089269B (en) | 2013-01-23 | 2013-01-23 | Method for cutting and pre-breaking top coal to improve mining efficiency by utilizing water power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310024083.3A CN103089269B (en) | 2013-01-23 | 2013-01-23 | Method for cutting and pre-breaking top coal to improve mining efficiency by utilizing water power |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103089269A CN103089269A (en) | 2013-05-08 |
| CN103089269B true CN103089269B (en) | 2015-03-11 |
Family
ID=48202338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310024083.3A Expired - Fee Related CN103089269B (en) | 2013-01-23 | 2013-01-23 | Method for cutting and pre-breaking top coal to improve mining efficiency by utilizing water power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103089269B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104632224B (en) * | 2014-12-30 | 2017-01-18 | 辽宁天安科技有限公司 | Shortwall hydraulic mining method along strike |
| CN104712338A (en) * | 2015-01-15 | 2015-06-17 | 山东科技大学 | Thick seam fully-mechanized caving faces double-layer hard-and-thick strata advance presplitting method |
| CN110644995A (en) * | 2019-10-25 | 2020-01-03 | 山东东山古城煤矿有限公司 | Top coal caving pre-splitting section, pre-splitting device and method based on hard and thick coal seam of coal mine |
| CN112943242A (en) * | 2021-02-03 | 2021-06-11 | 中国矿业大学 | Method for improving lump coal rate of coal mining |
| CN114542067B (en) * | 2022-01-16 | 2023-02-03 | 中南大学 | Safe mining method for coal seam overlying hard rock stratum |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718191A (en) * | 2009-08-27 | 2010-06-02 | 中国矿业大学 | Directional cracking method for waterpower slotting |
| CN102654049A (en) * | 2012-05-28 | 2012-09-05 | 中国矿业大学 | Porous linear control hydraulic fracturing method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2305771C1 (en) * | 2006-02-17 | 2007-09-10 | Общество с ограниченной ответственностью "Подземгазпром" (ООО "Подземгазпром") | Method for borehole mining of permafrost sedimentary rock |
| CN101161990A (en) * | 2006-10-12 | 2008-04-16 | 中国矿业大学(北京) | Method for realizing roof caving by using abrasive water jet |
| CN101498210B (en) * | 2008-12-18 | 2012-11-28 | 中国石油集团长城钻探工程有限公司 | Coal bed gas slim-hole hydraulic jet orienting fracturing yield increasing method |
| CN102777183B (en) * | 2012-07-24 | 2015-11-25 | 河南理工大学 | Hydraulic coal mining process for bottom plate roadway |
-
2013
- 2013-01-23 CN CN201310024083.3A patent/CN103089269B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718191A (en) * | 2009-08-27 | 2010-06-02 | 中国矿业大学 | Directional cracking method for waterpower slotting |
| CN102654049A (en) * | 2012-05-28 | 2012-09-05 | 中国矿业大学 | Porous linear control hydraulic fracturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103089269A (en) | 2013-05-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103089269B (en) | Method for cutting and pre-breaking top coal to improve mining efficiency by utilizing water power | |
| CN102094668B (en) | High-pressure hydraulic tunneling, pressure releasing and protrusion removing method for upper drainage roadway | |
| WO2021103533A1 (en) | Operation-controllable, roof-cutting, pressure-relief, gob-side entry retaining method | |
| CN101718191B (en) | Directional cracking method for waterpower slotting | |
| CN102536240B (en) | Method for preventing rock burst by adopting high-pressure fracturing | |
| CN106593445A (en) | Old goaf underlying close distance coal seam strata-overlying isolation grouting filling exploitation method | |
| CN105507812A (en) | Microwave-radiation in-hole vaporized hydraulic flushing method | |
| CN102536239A (en) | Long-wall working face coal pillar-free mining method | |
| CN102877857B (en) | Deep hole pre-grouting top plate reinforcement method for large-mining height working face under special geological conditions | |
| CN107023295A (en) | A kind of hard coal erosion control destressing borehole construction method and equipment | |
| CN106703808A (en) | Method for increasing end top coal recovery rate by means of thick coal seam fully-mechanized caving face mining roadway drilling presplitting | |
| CN112983418A (en) | Method for hydraulic fracturing pressure relief of coal mine underground coal face withdrawal channel | |
| US11976557B2 (en) | Coal bump control method for sectional hydraulic fracturing regions of near vertical ultra thick coal seam | |
| CN105863639A (en) | Coal-mining method of loose coal seam | |
| CN106194186A (en) | The drilling release control method of coal wall stope drift active workings advance support section deformation | |
| CN114352345B (en) | Low-permeability inclined coal seam coal and gas fluidization co-mining system and method | |
| CN104727847B (en) | Filled wall is from the gob-side entry retaining method without coal column eliminated | |
| CN204627657U (en) | Coal mine gas ground extraction casing programme | |
| CN102678166A (en) | Method for increasing gas extraction rate by permeability increasing of single thick coal seam | |
| CN113389548B (en) | Method for coal mine stope face to rapidly pass through coal-free area | |
| CN103061732A (en) | Hydraulic fracturing method of 2-3 meter hard medium sandstone stratum of roof of coal seam | |
| CN112855061A (en) | Hydraulic cutting recovery system and method for ground gas extraction shear failure drilling | |
| CN102155239A (en) | Ground stress release method for high ground stress soft rock tunnel positive step excavation | |
| CN113730844B (en) | Coal gangue spontaneous combustion fire prevention and treatment method | |
| CN110985123A (en) | High-pressure hydraulic pre-cracking dangerous impact ore pressure crossheading roadway drilling arrangement method |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150311 Termination date: 20190123 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |