CN102691502B - 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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- CN102691502B CN102691502B CN201210160139.3A CN201210160139A CN102691502B CN 102691502 B CN102691502 B CN 102691502B CN 201210160139 A CN201210160139 A CN 201210160139A CN 102691502 B CN102691502 B CN 102691502B
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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 for improving fully mechanized coal face top-coal recovery rate, reducing the method for exploitation of coal resources loss.
Background technology
Mining technology has become important technical and the method and approach that China's coal-mine enterprise realizes high-yield and high-efficiency, is also the important directions of following coal mining development.How fully mechanized coal face improves coal resources recovery ratio, reduces coal resources loss and has become each bargh technical barrier urgently to be resolved hurrily.Just adopt in process comprehensive putting, top coal breaking down for the first time step pitch is comparatively large, have lost a part and pushes up coal, cause the reduction of resource recovery ratio, and brings potential safety hazard to the aspect such as Roof Control, fire extinguishing.Therefore, how to reduce the Coal Loss combined and put and just adopt, improve the comprehensive extracting and caving face rate of recovery, ensureing that comprehensive coal face safety is normal and produce, is one of major issue that must solve in Longwall top coal caving technology application process.
Summary of the invention
The technical issues that need to address of the present invention are to provide a kind of easy and simple to handle, and the technical measures of putting and just adopting top-coal recovery rate are combined in the raising of low cost.For realizing the problems referred to above, the step taked is: design adopt in working face open-off cut eye and rib front, to top coal drill water filling soften expand top coal mode, by theory calculate determination data of holes drilled, reduce top coal at the beginning of collapse step pitch so that reduce coal resources loss.
Concrete technical scheme is as follows:
A kind of method improving the comprehensive Sub-Level Caving rate of recovery, before working surface production, in advance cut eye and on, boring is arranged in lower gangway, wherein cut eye boring to be arranged in parallel along cutting a direction, respectively cut a drilling hole apart from being less than or equal to 10m, hole depth is more than or equal to 22m, respectively cutting eye boring is 75 ° ~ 80 ° with top board angle, gallery boring is arranged in the upper of 5m place, working face wall front, in lower gangway, vertical gallery trend is upper, in lower gangway, from ground coal, to pushing up, coal is each plays one group of boring, the pitch-row often organizing boring is less than or equal to 2m, hole depth is more than or equal to 92m, the aperture of each gallery boring is greater than 1m apart from base plate, it is 5 ~ 9 ° with top board angle, to cutting dynamical pressure water infusion in eye boring and the boring of upper lower gangway, water injection pressure is greater than 20MPa.
Cutting to pushing up the softening top coal that expands of coal punching water filling in eye and upper and lower gallery in advance, reduction top coal breaking down for the first time step pitch, impels top coal to be caving in advance.
The invention has the advantages that:
The abundant recovery of working face open-off cut gugen kohle charcoal, decreases because coal gathers the possibility producing spontaneous combustionof coal, decreases the spilling of pernicious gas.High pressure water injection softening top coal is carried out to coal seam, itself adds the content of coal seam moisture, decrease dust-producing amount when coal seam is caving, improve working surface production environment.
Accompanying drawing explanation
Fig. 1 is that the present invention cuts eye boring layout schematic diagram;
Fig. 2 is that schematic diagram (gallery is only shown) is arranged in gallery of the present invention boring.
In figure: 1-cuts eye, 2-cuts eye and holes, 3-work plane gallery, and 4-gallery is holed, 5-top board, the angle of the boring of α-Qie eye and top board, the angle of β-gallery boring and top board, the distance of h-gallery drilling orifice and base plate.
Detailed description of the invention
Below in conjunction with accompanying drawing, enforcement of the present invention is described further:
For certain ore deposit, according to this colliery actual measurement fully mechanized coal face geologic information and adjacent ore deposit pressure data of having exploited complete work plane, the average buried depth of spine road is 810m, the thick 9.03m of average coal, seam inclination 2 ~ 5 °, coal bed joints cranny development.Top, coal seam is followed successively by 2.35m siltstone, 12.42m Extra-fine sand rock 5.82m siltstone etc. from lower to upper.The length that comprehensive coal face cuts eye is 220m, and periodic caving is 23m.
Cause just adopts Shi Laoding and immediate roof does not all produce pressure to work plane top coal, and top coal is difficult to automatic whereabouts by deadweight.When upper work plane does not take any measure, top coal breaking down for the first time step pitch is 9.2m.In order to make top coal be caving in advance, improving recovery ratio, reducing and just adopting loss, cutting to top coal construction drill in eye and gallery respectively in advance, the softening top coal that expands of water filling.
See accompanying drawing 1 and Fig. 2, before working surface production, in advance cut eye and on, boring is arranged in lower gangway, wherein cut eye boring to be arranged in parallel along cutting a direction, respectively cut a drilling hole apart from being less than or equal to l0m, hole depth is more than or equal to 22m, respectively cut eye boring and top board angle α between 75 ° ~ 80 °, gallery boring is arranged in upper lower gangway, boring is started from 5m place, working face wall front, vertical gallery separately moves towards from ground coal to pushing up in coal upper, respectively successively in lower gangway play one group of boring, often in group boring, the pitch-row in each hole is less than or equal to 2m, hole depth is more than or equal to 92m, the height h of the orifice distance base plate of each gallery boring is more than or equal to 1m, the angle β of each gallery boring and top board is between 5 ~ 9 °, after boring deploys, simultaneously to cutting dynamical pressure water infusion in eye boring and the boring of upper and lower gallery, water injection pressure is greater than 20MPa, ensures that coal-based of top infiltrates simultaneously, improves the effect of water filling.
After applying content water filling of the present invention softening top coal at the scene, the observation site actual preliminary roof caving step pitch of top coal is 6.8m, is advanced by more than 2m than a upper section.Calculate by top coal thickness 5.5m and top-coal recovery rate 80%, many recovery coal 4200t, obvious economic.
The above; be only patent of the present invention preferably detailed description of the invention; but the protection domain of patent of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope of patent diselosesll of the present invention; the change that can expect easily or replacement, within the protection domain that all should be encompassed in patent of the present invention.
Claims (1)
1. improve the method combining the Sub-Level Caving rate of recovery, it is characterized in that:
The top, coal seam of described top coal is followed successively by 2.35m siltstone, 12.42m Extra-fine sand rock, 5.82m siltstone from lower to upper, and the length that comprehensive coal face cuts eye is 220m, and periodic caving is 23m,
Said method comprising the steps of:
(1) cutting to pushing up the softening top coal that expands of coal punching water filling in eye and upper and lower gallery in advance, reduction top coal breaking down for the first time step pitch, impels top coal to be caving in advance; Before working surface production, arrange boring cutting in eye and upper and lower gallery in advance, wherein cut eye boring and be arranged in parallel along cutting a direction, respectively cut a drilling hole apart from being less than or equal to 10m, hole depth is more than or equal to 22m, and respectively cutting eye boring is 75 ° ~ 80 ° with top board angle; Gallery boring is arranged in the upper and lower gallery outside the 5m of working face wall front, in upper and lower gallery, from ground coal, to pushing up, coal is each plays one group of boring to vertical gallery trend, the pitch-row often organizing boring is less than 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, is 5 ~ 9 ° with top board angle;
(2) to dynamical pressure water infusion while of cutting in eye boring and the boring of upper and lower gallery, water injection pressure is greater than 20MPa, ensures that top coal infiltrates simultaneously.
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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102691502A CN102691502A (en) | 2012-09-26 |
| CN102691502B true CN102691502B (en) | 2015-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210160139.3A Expired - Fee Related CN102691502B (en) | 2012-05-22 | 2012-05-22 | Method for improving recovery rate of fully mechanized top coal caving |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
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 |
|---|
| 综放面顶煤注水弱化技术实践;潘大伟;《山东煤炭科技》;20110531(第5期);190-191页 * |
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| CN102691502A (en) | 2012-09-26 |
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