CN104879127A - Method for replacing coal column by floor heaving top connecting - Google Patents

Method for replacing coal column by floor heaving top connecting Download PDF

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Publication number
CN104879127A
CN104879127A CN201510201173.4A CN201510201173A CN104879127A CN 104879127 A CN104879127 A CN 104879127A CN 201510201173 A CN201510201173 A CN 201510201173A CN 104879127 A CN104879127 A CN 104879127A
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China
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coal column
coal
base plate
column
pucking
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CN201510201173.4A
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Chinese (zh)
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CN104879127B (en
Inventor
马占国
杨党委
王宇
冯建川
李之坚
严圣平
杨玉树
倪亮
张金亮
四旭飞
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中国矿业大学
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Abstract

The invention discloses a method for replacing a coal column by floor heaving top connecting. According to the characteristic that an expanded or soft stratum is easy to heave, an expanded or soft base plate in a gob is expanded by utilizing the characteristics of high ground pressure, high side pressure, high broken expansion and high expansion after encountering water; a particular measure is adopted, so that the expanded or soft base plate in the gob (4) is heaved and is in tight contact with a top plate (1) so as to achieve the effective supporting effect, and the bearing core area of the coal column (2) is broken, and a bearing main body is converted into a heaved base plate (3) from the original coal column (2); after effective supporting, an original stripe is recovered, or the coal column (2) left in a mine is exploited in a room-and-pillar method. The method for replacing the coal column by floor heaving top connecting has the obvious effect of increasing the recovery rate on rock masses which are expanded after encountering the water or the soft base plate coal mine; moreover, a protection technology is simple; relevant equipment required for solid waste, paste or slurry filling is not required to be equipped; the investment, tunneling and shoring costs are reduced greatly.

Description

A kind of pucking connects the method that overhead changes coal column
Technical field
The present invention relates to the method for a kind of underground coal mine displacement coal column, specifically a kind of pucking being applicable to underground coal mine connects the method that overhead changes coal column, belongs to coal production technical field.
Background technology
Carrying out under water body, under building and under railway during the coal mining of these " three times ", for ensureing that subsidence value is in critical field, general employing strip mining, Striping noise is divided into some bands by by the coal seam of exploiting, adopt one, stay one, utilize the strip coal pillar stayed to support overlying rock to reach the object controlling ground settlement.
According to statistics, after carrying out strip mining, the coal of more than 60% is had to be crushed on underground with coal column form, form permanent coal column, cause the wasting of resources, because the consumption degree of coal resources and the demand of national economy are all strengthening day by day, these coal columns are by as recycle object, particularly in the area of China's high-quality scarce coal resources distribution, increase exploitation and exploitation dynamics especially.
But due to particularity and the complexity of this part coal column occurrence condition, requirement can not destroy ground installation, can not contaminated environment, therefore coal pillar recovery technology newly developed in recent years mainly contains spoil the like waste filling mining, paste body filling exploitation or band Collapsed zone grouting filling is utilized to subtract heavy exploitation etc., but utilize spoil the like waste, lotion or slip casting are filled and are needed filler to be transported to coal mine gob or stowboard, tunnelling, charges conveying and fill cost higher, production link is many, complex procedures, and waste time and energy, constrain the further genralrlization application of correlation technique.
By the impact of mining operation, top, tunnel, base plate and two help country rock can produce distortion and move in tunnel, namely the phenomenon that wherein roadway floor or gob floor upwards swell is referred to as pucking, pucking is the normal a kind of dynamic phenomenon occurred in roadway, its character with country rock, mining influence, mining depth and geological structure etc. are directly related, pucking makes roadway deformation, section diminishes, impact is ventilated, transport, restriction mine safety production, the coal column second mining particularly for " three times " soft rock, water-swellable rock mass mine brings extreme difficulties especially.
Summary of the invention
For the problems referred to above, the invention provides a kind of pucking and connect the method that overhead changes coal column, cost is less, is applicable to the coal column second mining of " three times " soft rock, water-swellable rock mass mine, can realizes effective support and second mining.
For achieving the above object, it is according to expanding or the feature of the easy pucking of soft stratum that this pucking connects method that overhead changes coal column, utilize highland pressure, high side pressure, high broken feature that is swollen and that meet the high expansion of water impel base plate dilatation in goaf, expansion in goaf or weak base plate are heaved and with top board close contact with after the effect reaching effective support, reclaim former band or room and pillar mining be retained in the coal column of mine underground, concrete steps are as follows:
A. adopt the different situations such as wide according to ground building protection grade, coal seam buried depth, mining thickness, band, select column intensity to calculate empirical formula to calculate the supporting capacity that scheme coal column is adopted in different lane, by results contrast, analyze the stability of coal column;
B. under the principle ensureing the carrying of coal column energy effective and safe, punching or grooving on coal column, punching or cutting groove depth are no more than 1/4th of bordroom width;
C. between coal column goaf base plate on carry out punching or grooving, punching or cutting groove depth be no more than 1/4th of bordroom width;
D. until the base plate in goaf between coal column heave and with top plate contact after, after proposing exploitation, top board and base plate heave the supporting design scheme of part, the different situations such as wide are adopted according to ground building protection grade, coal seam buried depth, mining thickness, band, column intensity is selected to calculate empirical formula to the supporting capacity of the base plate calculating the different lanes scheme of adopting and heave, by results contrast, analyze the stability of the base plate carrying cylinder heaved;
E. when the base plate strength heaved in goaf between coal column reaches required intensity level, destroy the carrying core district of coal column, discharge heavily stressed due to what early stage, roof and floor distortion was gathered in coal column, converted carrying main body to heave base plate by original coal column;
F. after carrying out effective support by the designing requirement in steps d, with coal excavation apparatus exploitation to reclaim when former Striping noise building presses down coal resource be retained in the coal column of down-hole.
Scheme as a further improvement on the present invention, the punching in described step b or the position of grooving are in the centre position of the vertical height of coal column, and multiple hole or groove distribute ringwise around coal column.
Scheme as a further improvement on the present invention, after step b, c, if the base plate heaved also does not connect top, then increases c1 step: carry out top layer shock blasting to base plate, blast hole depth is no more than 1/4th of bordroom width.
Scheme as a further improvement on the present invention, increases b1 step after step b: under the principle ensureing the carrying of coal column energy effective and safe, carry out top layer shock blasting to coal column, blast hole depth is no more than 1/4th of bordroom width.
Scheme as a further improvement on the present invention, after step b, c, if the base plate heaved also does not connect top, then increases c2 step: carry out water filling to the water-swellable rock mass body in base plate.
Scheme as a further improvement on the present invention, the method destroying the carrying core district of coal column in described step e is punching or water filling or loosen dynamic big gun on coal column.
Scheme as a further improvement on the present invention, adopting the different situations such as wide according to ground building protection grade, coal seam buried depth, mining thickness, band to select column intensity to calculate empirical formula be formula in following table described in step a, d:
Scheme as a further improvement on the present invention, the coal excavation apparatus in described step f is that comprehensive mechanical coal mining machine or comprehensive mechanized development machine or connection adopt machine or auger or explosive or hydraulic cutter material.
Compared with prior art, this pucking connects method that overhead changes coal column owing to adopting concrete measure to make the base plate in goaf heave and with top board close contact to reach the effect of effective support, utilize pucking phenomenon, utilize highland pressure, dilatation under the deviator of stress effect of the heavily stressed base plate impelled in goaf, therefore for " three times " soft rock, water-swellable rock mass mine, base plate in goaf is heaved and top board close contact completely, after reaching firm support dynamics, can to reclaim completely when former Striping noise building presses down coal resource be retained in the coal column of down-hole, the rate of recovery is high, and production technology is simple, do not need to arrange the conveying equipment that needs are filled in conveying spoil the like waste, lotion or slip casting in addition, excavation cost significantly reduces, meanwhile, utilize the dilatation under the deviator of stress effect of pucking phenomenon, base plate, be utilize base plate completely heavily stressed, its support strength is higher.
Accompanying drawing explanation
Fig. 1 is the structural representation that pillar overlying rock controls ground settlement;
Fig. 2 be on coal column and base plate punching or grooving after structural representation;
Fig. 3 is the structural representation that base plate heaves knot top under high stress;
Fig. 4 is the structural representation after destroying coal column carrying core district, when pucking effectively supports.
Fig. 5 is the structural representation after complete pillaring.
In figure: 1, top board, 2, coal column, 3, base plate, 4, goaf.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described.
For " three times " soft rock, water-swellable rock mass mine, as shown in Figure 1, its immediate bottom is generally soft stratum (as argillaceous rocks etc.), its permanent coal column 2 to be exploited and top board 1 are usually more complete, under helping the pressing mold effect of permanent coal column 2 and the effect of stress two, the rock stratum being positioned at the base plate 3 of the soft broken in whole goaf 4 can to goaf 4 squeezing flow, special in Deep Mine, high with the voltage rise that lands, dilatation under highland pressure zone, the heavily stressed deviator of stress effect impelling the base plate 3 in its goaf 4 is more remarkable, and pucking is more obvious.
As shown in Figures 2 to 5, it is according to expanding or the feature of the easy pucking of soft stratum that this pucking connects method that overhead changes coal column, utilization highland pressure, high side pressure, high broken feature that the is swollen and expansion of chance water height impel the expansion in goaf 4 or weak base plate 3 dilatation, adopt concrete measure that the expansion in goaf 4 or weak base plate 3 are heaved and with top board 1 close contact with after the effect reaching effective support, reclaim former band or room and pillar mining be retained in the coal column 2 of mine underground, concrete steps are as follows:
A. adopt the different situations such as wide according to ground building protection grade, coal seam buried depth, mining thickness, band, select column intensity to calculate empirical formula to calculate the supporting capacity that scheme coal column is adopted in different lane, by results contrast, analyze the stability of coal column;
B. under the principle ensureing the carrying of coal column 2 energy effective and safe, punching or grooving on coal column 2, punching or cutting groove depth are no more than 1/4th of bordroom width, the constraint that within the scope of the hole depth of removal coal column 2 both sides, coal body is out of shape base plate 3, the load that top board 1 transmits concentrated to the supporting region of coal column 2, the stress making coal column 2 be delivered to base plate 3 increases, causes base plate 3 to heave more tempestuously simultaneously;
C. between coal column 2 goaf 4 base plate 3 on carry out punching or grooving, punching or cutting groove depth are no more than 1/4th of bordroom width, destroy base plate 3 top layer to the restriction of pucking, in base plate 3, cause stress to concentrate, impel preexisting crack to grow, base plate 3 dilatation under deviator of stress effect is heaved;
D. after the base plate 3 in goaf 4 between coal column 2 is heaved and contacted with top board 1, after proposing exploitation, top board and base plate heave the supporting design scheme of part, the different situations such as wide are adopted according to ground building protection grade, coal seam buried depth, mining thickness, band, column intensity is selected to calculate empirical formula to the supporting capacity of the base plate 3 calculating the different lanes scheme of adopting and heave, by results contrast, analyze the stability that the base plate 3 heaved carries cylinder;
E. when base plate 3 intensity heaved in goaf 4 between coal column 2 reaches required intensity level, take measures to destroy the carrying core district of coal column 2, discharge heavily stressed due to what early stage, roof and floor distortion was gathered in coal column 2, converted carrying main body to heave base plate 3 by original coal column 2;
F. carry out supporting by the designing requirement in steps d, with coal excavation apparatus exploitation to reclaim when former Striping noise building presses down coal resource be retained in the coal column 2 of down-hole;
Control face propulsion speed well in the process of exploitation coal pillar recovery 2, make advanced pressure peak position both aggravate base plate and heave, working face wall also will be made to be in advanced pressure and reduce district, do not occur heavily stressed large deformation.
In order to the constraint that coal body within the scope of further effectively removal coal column 2 both sides hole depth is out of shape base plate 3, effective load transmitted by top board 1 is concentrated to the supporting region of coal column 2 simultaneously, scheme as a further improvement on the present invention, punching in described step b or the position of grooving are in the centre position of the vertical height of coal column 2, and multiple hole or groove distribute ringwise around coal column 2.
Internal stress can be discharged rapidly to make base plate 3, heave rapidly, scheme as a further improvement on the present invention, after step b, c, if the base plate heaved 3 does not also connect top, then increase c1 step: top layer shock blasting is carried out to base plate 3, blast hole depth is no more than 1/4th of bordroom width, discharges internal stress rapidly further.
In order to the effect that the stress increasing coal column 2 shifts to core district, after step b, increase b1 step: under the principle ensureing the carrying of coal column 2 energy effective and safe, carry out top layer shock blasting to coal column 2, blast hole depth is no more than 1/4th of bordroom width.
Because the effect of water can reduce rock bedding, frictional force between joint and crack, the integrated connection intensity of rock is reduced, make rock mass along the joint plane of rock stratum, bed plane and fissure-plane form slide surface, and be divided into a lot of thin layer by connecting rock mass closely between original layer, even completely lose intensity, and some mineralogical composition in rock meets water generation expansion, therefore, in order to accelerate the speed that base plate 3 is heaved further, scheme as a further improvement on the present invention, through step b, after c, if the base plate heaved 3 does not also connect top, then increase c2 step: water filling is carried out to the water-swellable rock mass body in base plate 3.
In order to destroy rapidly coal column 2 carrying core district, discharge because roof and floor 3 in early stage is out of shape gather in coal column 2 heavily stressed, scheme as a further improvement on the present invention, the measure destroying the carrying core district of coal column 2 in described step e is punching or water filling or loosen dynamic big gun on coal column 2.
In order to more accurately calculate the supporting capacity of coal column 2 or base plate 3 when scheme is adopted in different lane; scheme as a further improvement on the present invention, adopting the different situations such as wide according to ground building protection grade, coal seam buried depth, mining thickness, band to select column intensity to calculate empirical formula be formula in following table described in step a, d:
In order to safety, high efficiente callback exploitation coal column 2, scheme as a further improvement on the present invention, the coal excavation apparatus in described step f is that comprehensive mechanical coal mining machine or comprehensive mechanized development machine or connection adopt machine or auger or explosive or hydraulic cutter material.
This pucking connects method that overhead changes coal column owing to adopting concrete measure to make the base plate 3 in goaf 4 heave and with top board 1 close contact to reach the effect of effective support, utilize pucking phenomenon, utilize highland pressure, dilatation under the deviator of stress effect of the heavily stressed base plate 3 impelled in goaf 4, therefore for " three times " soft rock, water-swellable rock mass mine, base plate 3 in goaf 4 is heaved and top board 1 close contact completely, after reaching firm support dynamics, as shown in Figure 5, can to reclaim completely when former Striping noise building presses down coal resource be retained in the coal column 2 of down-hole, the rate of recovery is high, and production technology is simple, do not need to arrange the conveying equipment that needs are filled in conveying spoil the like waste, lotion or slip casting in addition, excavation cost significantly reduces, meanwhile, utilize the dilatation under the deviator of stress effect of pucking phenomenon, base plate 3, be utilize base plate 3 completely heavily stressed, its support strength is higher.

Claims (8)

1. a pucking connects the method that overhead changes coal column, it is characterized in that, it is the feature according to expansion or the easy pucking of soft stratum, utilize highland pressure, high side pressure, high broken feature that is swollen and that meet the high expansion of water impel base plate (3) dilatation in goaf (4), expansion in goaf (4) or weak base plate (3) are heaved and with top board (1) close contact with after the effect reaching effective support, reclaim former band or room and pillar mining be retained in the coal column (2) of mine underground, concrete steps are as follows:
A. adopt the different situations such as wide according to ground building protection grade, coal seam buried depth, mining thickness, band, select column intensity to calculate empirical formula to calculate the supporting capacity that scheme coal column is adopted in different lane, by results contrast, analyze the stability of coal column;
B., under the principle ensureing the carrying of coal column (2) energy effective and safe, at the upper punching of coal column (2) or grooving, punching or cutting groove depth are no more than 1/4th of bordroom width;
C. between coal column (2) goaf (4) base plate (3) on carry out punching or grooving, punching or cutting groove depth be no more than 1/4th of bordroom width;
D. after the base plate (3) in goaf (4) between coal column (2) is heaved and contacted with top board (1), after proposing exploitation, top board and base plate heave the supporting design scheme of part, and adopt the different situations such as wide according to ground building protection grade, coal seam buried depth, mining thickness, band, column intensity is selected to calculate empirical formula to the supporting capacity of the base plate (3) calculating the different lanes scheme of adopting and heave, by results contrast, analyze the stability of base plate (3) the carrying cylinder heaved;
E. when base plate (3) intensity heaved in goaf (4) between coal column (2) reaches required intensity level, destroy the carrying core district of coal column (2), discharge heavily stressed due to what early stage, roof and floor distortion was gathered in coal column (2), converted carrying main body to heave base plate (3) by original coal column (2);
F. after carrying out effective support by the designing requirement in steps d, with coal excavation apparatus exploitation to reclaim when former Striping noise building presses down coal resource be retained in the coal column (2) of down-hole.
2. pucking according to claim 1 connects the method that overhead changes coal column, it is characterized in that, punching in described step b or the position of grooving are in the centre position of the vertical height of coal column (2), and multiple hole or groove distribute ringwise around coal column (2).
3. pucking according to claim 1 connects the method that overhead changes coal column, it is characterized in that, after step b, c, if the base plate heaved (3) does not also connect top, then increase c1 step: carry out top layer shock blasting to base plate (3), blast hole depth is no more than 1/4th of bordroom width.
4. pucking according to claim 1 connects the method that overhead changes coal column, it is characterized in that, b1 step is increased: under the principle ensureing the carrying of coal column (2) energy effective and safe after step b, carry out top layer shock blasting to coal column (2), blast hole depth is no more than 1/4th of bordroom width.
5. pucking according to claim 1 connects the method that overhead changes coal column, it is characterized in that, after step b, c, if the base plate heaved (3) does not also connect top, then increase c2 step: water filling is carried out to the water-swellable rock mass body in base plate (3).
6. pucking according to claim 1 connects the method that overhead changes coal column, it is characterized in that, the method destroying the carrying core district of coal column (2) in described step e is in the upper punching of coal column (2) or water filling or loosens dynamic big gun.
7. pucking according to claim 1 connects the method that overhead changes coal column; it is characterized in that, adopting the different situations such as wide according to ground building protection grade, coal seam buried depth, mining thickness, band to select column intensity to calculate empirical formula be formula in following table described in step a, d:
8. pucking according to claim 1 connects the method that overhead changes coal column, it is characterized in that, the coal excavation apparatus in described step f is that comprehensive mechanical coal mining machine or comprehensive mechanized development machine or connection adopt machine or auger or explosion
Equipment or hydraulic cutter material.
CN201510201173.4A 2015-04-24 2015-04-24 A kind of pucking connects the method that overhead changes coal column CN104879127B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1963149A (en) * 2006-11-17 2007-05-16 中国矿业大学 Mining method for replacement of banded coal under building by waste rock
CN101915108A (en) * 2010-06-22 2010-12-15 中国矿业大学 Method for controlling floor heave of dynamic pressure tunnel
CN101975074A (en) * 2010-10-16 2011-02-16 山东科技大学 Soft rock roadway anchored concrete filled steel tube anti-floor heave device and construction method thereof
CN202731991U (en) * 2012-07-27 2013-02-13 山东科技大学 Test model for banded filling, replacement and mining of fault protective coal pillar
CN103993882A (en) * 2014-05-26 2014-08-20 中国矿业大学 Method for replacing strip coal pillars by means of grouting in collapse area
CN104675412A (en) * 2015-02-12 2015-06-03 湖南省煤炭地质勘查院 Closed integral bearing supporting structure for coal-mine coal-pillar bottom plate crushed surrounding rock roadway

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1963149A (en) * 2006-11-17 2007-05-16 中国矿业大学 Mining method for replacement of banded coal under building by waste rock
CN101915108A (en) * 2010-06-22 2010-12-15 中国矿业大学 Method for controlling floor heave of dynamic pressure tunnel
CN101975074A (en) * 2010-10-16 2011-02-16 山东科技大学 Soft rock roadway anchored concrete filled steel tube anti-floor heave device and construction method thereof
CN202731991U (en) * 2012-07-27 2013-02-13 山东科技大学 Test model for banded filling, replacement and mining of fault protective coal pillar
CN103993882A (en) * 2014-05-26 2014-08-20 中国矿业大学 Method for replacing strip coal pillars by means of grouting in collapse area
CN104675412A (en) * 2015-02-12 2015-06-03 湖南省煤炭地质勘查院 Closed integral bearing supporting structure for coal-mine coal-pillar bottom plate crushed surrounding rock roadway

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