CN102691502A - Method for improving recovery rate of fully mechanized top coal caving - Google Patents
Method for improving recovery rate of fully mechanized top coal caving Download PDFInfo
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- CN102691502A CN102691502A CN2012101601393A CN201210160139A CN102691502A CN 102691502 A CN102691502 A CN 102691502A CN 2012101601393 A CN2012101601393 A CN 2012101601393A CN 201210160139 A CN201210160139 A CN 201210160139A CN 102691502 A CN102691502 A CN 102691502A
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Abstract
The invention relates to a method for improving the recovery rate of fully mechanized top coal carving, comprising the following steps: arranging boreholes in open-off cut and upper and lower drifts before the production of a working surface and performing dynamical pressure water injection in the cut holes and the boreholes of the upper and lower drifts according to water injection pressure of more than 200MPa, wherein the cut boreholes are parallelly arranged along the direction of the open-off cut, the hole distance between the cut boreholes is smaller than or equal to 10m, the hole depth is larger than or equal to 22m, the included angle between each cut borehole and a top roof is 75-80 degrees, and the drift boreholes are arranged in the upper and lower drifts being away from front of the coal wall of the working surface by 5m; a vertical drift in the upper and lower drifts is provided with a group of boreholes respectively from bottom coal to top coal, the hole distance of each group of boreholes is smaller than or equal to 2m, the hole depth is larger than or equal to 92m, the distance from the orifice of each drift borehole to a bottom plate is larger than 1m, and the included angle between each drift borehole and the top roof is 5-9 degrees.
Description
Technical field
The present invention relates to a kind of fully mechanized coal face top-coal recovery rate that is used to improve, reduce the method for coal resources exploitation loss.
Background technology
The mining technology has become the important technical and the method and approach of China's coal-mine enterprises implement high-yield and high-efficiency, also is the important directions of following coal mining development.How fully mechanized coal face improves the coal resources recovery ratio, reduces coal resources loss having become the technical barrier that each bargh needs to be resolved hurrily.Just adopt in the process combining to put, coal collapse the for the first time step pitch that falls in top is bigger, has lost a part of top coal, causes the reduction of resource recovery ratio, and has brought potential safety hazard for aspects such as Roof Control, anti-fire extinguishing.Therefore, how reducing to combine and put the Coal Loss of just adopting, improve the comprehensive extracting and caving face rate of recovery, ensure comprehensive coal face safety ordinary production, is one of major issue that must solve in the longwall top coal caving technical application process.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of easy and simple to handle, improve cheaply to combine to put the technical measures of just adopting top-coal recovery rate.Be to realize the problems referred to above, the step of taking is: design is employed in work plane and cuts eye and rib the place ahead, to the drill mode of the softening expansion top of water filling coal of top coal, confirms data of holes drilled through Theoretical Calculation, reduces just collapse step pitch and then reduce the coal resources loss of top coal.
Concrete technical scheme is following:
A kind of method of combining the Caving Coal rate of recovery that improves; Before working surface production; In advance cut the eye with on; Arrange boring in the lower gangway; Wherein cutting eye boring is arranged in parallel along cutting a direction; Respectively cut eye boring pitch-row smaller or equal to 10m; Hole depth is more than or equal to 22m; Respectively cutting eye boring is 75 ° ~ 80 ° with the top board angle; The gallery drill holes is in 5m place, working face wall the place ahead; In the lower gangway; Vertical gallery trend is last; Each plays one group of boring to the top coal from ground coal in the lower gangway, and the pitch-row of every group of boring is smaller or equal to 2m, and hole depth is more than or equal to 92m; The aperture of each gallery boring apart from base plate greater than 1m, with the top board angle be 5 ~ 9 °; Dynamic pressure water filling in cutting eye boring and the boring of last lower gangway, water injection pressure is greater than 20MPa.
In advance in cutting eye and upper and lower gallery to the softening expansion top of top coal punching water filling coal, the coal step pitch that falls that collapses for the first time in reduction top impels the top coal to collapse in advance.
The invention has the advantages that:
Work plane is cut the abundant recovery of gugen kohle charcoal, has reduced because of coal gathers the possibility that produces spontaneous combustionof coal, has reduced overflowing of pernicious gas.The softening top of high pressure water injection coal is carried out in the coal seam, itself increased the content of coal seam moisture, also reduced the coal seam dust-producing amount when falling that collapses, improved the working surface production environment.
Description of drawings
Fig. 1 is that the present invention cuts a drill holes sketch map;
Fig. 2 is a gallery drill holes sketch map of the present invention (gallery only is shown).
Among the figure: 1-cuts eye, and 2-cuts eye and holes, 3-work plane gallery, the boring of 4-gallery, 5-top board, the angle of α-Qie eye boring and top board, the angle of β-gallery boring and top board, the distance of h-gallery drilling orifice and base plate.
The specific embodiment
Below in conjunction with accompanying drawing enforcement of the present invention is done and to be further described:
With certain ore deposit is example, presses data according to this colliery actual measurement fully mechanized coal face geologic information and adjacent ore deposit of having exploited the work plane that finishes, and the average buried depth of known gallery is 810m, the average thick 9.03m of coal, 2 ~ 5 ° of seam inclinations, coal bed joints cranny development.The top, coal seam is followed successively by 2.35m siltstone, 12.42m powder packsand 5.82m siltstone etc. from lower to upper.The length that comprehensive coal face is cut eye is 220m, and old top periodic weighting step pitch is 23m.
With directly pushing up work plane top coal is not all produced pressure because of just adopting Shi Laoding, the top coal is difficult to automatic whereabouts by deadweight.When last work plane was not taked any measure, coal collapse the for the first time step pitch that falls in top was 9.2m.In order to make the top coal collapse in advance, improve recovery ratio, reduce and just adopt loss, in advance respectively in cutting eye and gallery to top coal construction drill, expansion top coal is softened in water filling.
Referring to accompanying drawing 1 and Fig. 2; Before working surface production; In advance cut the eye with on; Arrange boring in the lower gangway; Wherein cutting eye boring is arranged in parallel along cutting a direction; Respectively cut eye boring pitch-row smaller or equal to l0m; Hole depth is more than or equal to 22m; Respectively cut eye boring and top board angle between 75 ° ~ 80 °; On the gallery drill holes in the lower gangway; Begin boring from 5m place, working face wall the place ahead; Vertically separately gallery trend from ground coal in the coal of top last; Each plays one group of boring successively in the lower gangway; The pitch-row in each hole is smaller or equal to 2m in every group of boring; Hole depth is more than or equal to 92m, and the height h of the orifice distance base plate of each gallery boring is more than or equal to 1m, and the angle β of each gallery boring and top board is between 5 ~ 9 °; After drill holes finishes, dynamic pressure water filling in cutting eye boring and the boring of upper and lower gallery simultaneously, water injection pressure is greater than 20MPa, and coal-based of assurance top is soaked into simultaneously, improves the effect of water filling.
After using the softening top of content water filling of the present invention coal at the scene, coal actual first caving step pitch in top, observation site is 6.8m, has shifted to an earlier date more than the 2m than a last section.Calculate by top coal thickness 5.5m and top-coal recovery rate 80%, reclaim coal 4200t, obvious economic more.
The above; Be merely the preferable specific embodiment of patent of the present invention; But the protection domain of patent of the present invention is not limited thereto; Any technician who is familiar with the present technique field is in the technical scope that patent of the present invention discloses, and the variation that can expect easily or replacement all should be encompassed within the protection domain of patent of the present invention.
Claims (2)
1. one kind is improved the method for combining the Caving Coal rate of recovery, it is characterized in that:
(1) before working surface production; In cutting eye and upper and lower gallery, arrange boring in advance, wherein cut eye boring and be arranged in parallel, respectively cut eye boring pitch-row smaller or equal to 10m along cutting a direction; Hole depth is more than or equal to 22m, and respectively cutting eye boring is 75 ° ~ 80 ° with the top board angle; In the upper and lower gallery of gallery drill holes outside the 5m of working face wall the place ahead; Each plays one group of boring to vertical gallery trend to the top coal from ground coal in upper and lower gallery; The pitch-row of every group of boring is smaller or equal to 2m; Hole depth is more than or equal to 92m; The orifice distance base plate of each gallery boring is greater than 1m, with the top board angle be 5 ~ 9 °;
(2) water filling of dynamic pressure simultaneously in cutting eye boring and the boring of upper and lower gallery, water injection pressure is greater than 20MPa.
2. the method for the Caving Coal rate of recovery is combined in raising as claimed in claim 1, it is characterized in that: in advance in cutting eye and upper and lower gallery to the softening expansion top of top coal punching water filling coal, the coal step pitch that falls that collapses for the first time in reduction top impels the top coal to collapse in advance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210160139.3A CN102691502B (en) | 2012-05-22 | 2012-05-22 | Method for improving recovery rate of fully mechanized top coal caving |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210160139.3A CN102691502B (en) | 2012-05-22 | 2012-05-22 | Method for improving recovery rate of fully mechanized top coal caving |
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| CN102691502A true CN102691502A (en) | 2012-09-26 |
| CN102691502B CN102691502B (en) | 2015-04-01 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105489106A (en) * | 2016-01-08 | 2016-04-13 | 河南理工大学 | Hard roof water-injection softening laboratorial simulation system and method |
| CN106703808A (en) * | 2016-07-06 | 2017-05-24 | 中国矿业大学 | Method for increasing end top coal recovery rate by means of thick coal seam fully-mechanized caving face mining roadway drilling presplitting |
| CN109667569A (en) * | 2019-01-07 | 2019-04-23 | 中国矿业大学 | Caving Roof Coal Mining Face coal caving ability Enhancement Method |
| CN110821493A (en) * | 2018-08-07 | 2020-02-21 | 中国矿业大学(北京) | Coal caving system and method for reducing loss of coal caving at end of fully mechanized caving face |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1191582A1 (en) * | 1984-06-19 | 1985-11-15 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Угольный Институт | Method of solid roof composition |
| CN101644156A (en) * | 2009-07-17 | 2010-02-10 | 中国矿业大学 | Method for weakening coal-rock mass by hydraulic blasting and fracturing |
-
2012
- 2012-05-22 CN CN201210160139.3A patent/CN102691502B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1191582A1 (en) * | 1984-06-19 | 1985-11-15 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Угольный Институт | Method of solid roof composition |
| CN101644156A (en) * | 2009-07-17 | 2010-02-10 | 中国矿业大学 | Method for weakening coal-rock mass by hydraulic blasting and fracturing |
Non-Patent Citations (1)
| Title |
|---|
| 潘大伟: "综放面顶煤注水弱化技术实践", 《山东煤炭科技》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105489106A (en) * | 2016-01-08 | 2016-04-13 | 河南理工大学 | Hard roof water-injection softening laboratorial simulation system and method |
| CN105489106B (en) * | 2016-01-08 | 2018-02-13 | 河南理工大学 | A kind of laboratory simulation tight roof water filling melded system and method |
| CN106703808A (en) * | 2016-07-06 | 2017-05-24 | 中国矿业大学 | Method for increasing end top coal recovery rate by means of thick coal seam fully-mechanized caving face mining roadway drilling presplitting |
| CN110821493A (en) * | 2018-08-07 | 2020-02-21 | 中国矿业大学(北京) | Coal caving system and method for reducing loss of coal caving at end of fully mechanized caving face |
| CN110821493B (en) * | 2018-08-07 | 2022-02-22 | 中国矿业大学(北京) | Coal caving system and method for reducing loss of coal caving at end of fully mechanized caving face |
| CN109667569A (en) * | 2019-01-07 | 2019-04-23 | 中国矿业大学 | Caving Roof Coal Mining Face coal caving ability Enhancement Method |
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| CN102691502B (en) | 2015-04-01 |
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