CN104100271B - Pre-pick is led cave filling artificial side secondary multiplexing roadside support and is become lane method - Google Patents
Pre-pick is led cave filling artificial side secondary multiplexing roadside support and is become lane method Download PDFInfo
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- CN104100271B CN104100271B CN201410300415.0A CN201410300415A CN104100271B CN 104100271 B CN104100271 B CN 104100271B CN 201410300415 A CN201410300415 A CN 201410300415A CN 104100271 B CN104100271 B CN 104100271B
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Abstract
The invention discloses a kind of pre-pick to lead cave filling artificial side secondary multiplexing roadside support and become lane method, first dig in advance before stope drift active workings driving and lead cave and filling forms artificial side, then driving stope drift active workings it are taken up in order of priority along artificial side both sides, the artificial side of filling, successively as the roadside support of two stope drift active workings, is two working face mining services.Compared with the edge air gallery technology in existing non chain pillar entryprotection technology, in the present invention, stope drift active workings are directly caving, and need not safeguard, the contraction percentage of area is little, equally applicable at complex conditions such as high seam longwall top coal caving, the heavily stressed seam minings in deep；Adopt pre-pick to lead cave and carry out filling, lead cave both sides during filling and be entity coal, during filling need not two side templates, technique is simple, speed of application is fast.
Description
Technical field
The present invention relates to colliery non chain pillar entryprotection technology.
Background technology
Non chain pillar entryprotection technology is the important development direction of Coal Mining Technology, it is possible not only to reduce the waste of coal resources, improve resource recovery, and eliminate the stress concentration phenomenon produced because of reserved coal pillar, the preventing and treating dynamic disaster such as Rock Burst, coal and gas prominent is highly beneficial, meanwhile, to mine sustainable development and realize lasting exploit also there is important function.
Non chain pillar entryprotection technology conventional at present mainly has gob side entry retaining and gob side entry driving two kinds.
So-called edge air gallery technology, refers to when mining, and utilizes support material to safeguard former stope drift active workings along edge, goaf, using the former stope drift active workings return aircourse as next work surface, has the disadvantage that
One is, owing to the stope drift active workings of a upper work surface and the return aircourse of next work surface are tunnels, tunnel is made to be subject to the mining influence of upper and lower two work surfaces, ore deposit pressure manifests acutely, the contraction percentage of area is big, particularly during the condition such as high seam longwall top coal caving, heavily stressed coal seam, deep and tight roof, gob side entry retaining is safeguarded extremely difficult, generally require and repeatedly reprocess, and obturator easily damages by pressure, produce crack and cause goaf air leaking, easy spontaneous combustion, seam mining that gas bearing capacity is high is very unfavorable.
Two are, due to when staying lane, it is necessary to utilize support material to build interim body of wall together at edge, goaf, during construction, first use individual prop gib, then pile up spoil body of wall, or frame formwork supporting plate carries out filling, complicated construction technique, filling velocity is slow, affects coal mining progress.
Three are, due to road-in packing, to connect top rate low, cuts top weak effect, cause obturator to bear pressure relatively big, are easily generated crack, easily cause again to goaf air leaking, it is easy to cause spontaneous combustionof coal.
So-called gob side entry driving technology, refers to along edge, goaf digging laneway or only stays very thin coal pillar digging laneway, according to whether stay coal column to be divided into Tunnelling Along Goaf and future small coal pillar gob side entry driving two ways, having the disadvantage that
When adopting Tunnelling Along Goaf, tunnel goaf side needs filling or piles up the waste pack etc. of one fixed width, and construction technology is more complicated；During pick lane, goaf and tunnel are directly through, cause goaf air leaking, and the water in goaf easily enters tunnel with harmful gas, and goaf is prevented fires, tunnelling is safely etc. very unfavorable；Be not suitable for easy spontaneous combustion, gas bearing capacity is high, water yield is big coal seam；
When adopting future small coal pillar gob side entry driving, by coal resources certain for waste, and stability of coal pillar is poor, easy unstability, wall caving, fresh distinguished and admirable by entrance goaf, coal column crack, easily causes goaf to get angry.
Summary of the invention
In order to overcome, tunnel in non chain pillar entryprotection technology is difficult in maintenance, the contraction percentage of area big, and coal mining speed is slow, supporting effect is poor and the shortcoming of goaf air leaking, and the present invention provides a kind of pre-pick to lead cave filling artificial side secondary multiplexing roadside support to become lane method.
The technical scheme is that
A kind of pre-pick is led cave filling artificial side secondary multiplexing roadside support and is become lane method, it is characterised in that:
The first step: the driving of the first upper and lower stope drift active workings of work surface
1.1st step: under pre-pick the first work surface, stope drift active workings lead cave
Under the first work surface before back production tunnelling, first the lower side position of stope drift active workings under the first work surface, under driving wide the first work surface of 2m, stope drift active workings lead cave, and under the first work surface, to lead stope drift active workings under cave and the first work surface contour isometric for stope drift active workings, and does gib；
1.2nd step: under the first work surface, stope drift active workings lead the filling of cave
Under first work surface, stope drift active workings are led after cave tunneled, and under the first work surface, stope drift active workings lead filling solidification material in cave, form the first artificial side of work surface；
1.3rd step: the first upper and lower stope drift active workings of work surface tunnel simultaneously
Treat under the first work surface that stope drift active workings lead the whole filling of cave complete, after solidifying 1～2 month, stope drift active workings under the first work surface are tunneled along the first artificial side of work surface, wherein the first artificial side of work surface becomes the side body of wall of stope drift active workings under the first work surface, conventionally tunnels stope drift active workings on the first work surface simultaneously；
Second step: the first working face mining
After layout of actual mining roadway completes under first work surface, carry out the exploitation of the first work surface；Along with the exploitation of the first work surface, the first upper and lower stope drift active workings of work surface after exploitation are no longer safeguarded, directly scrap, are caving gradually together with goaf, and the goaf being caving is progressively stable with the roof strata scrapping stope drift active workings；
3rd step: the driving of the second upper and lower stope drift active workings of work surface
Stope drift active workings on the second work surface are tunneled along the first work surface artificial side opposite side again while the first working face mining or after the first working face mining is complete, the first artificial side of work surface becomes the side body of wall of stope drift active workings on the second work surface, and under the second work surface, back production tunnelling carries out according to above-mentioned steps stope drift active workings driving method once；
4th step: the second working face mining and the upper and lower stope drift active workings driving of the 3rd work surface continue to use above-mentioned steps two and three respectively, by that analogy, until the exploitation of this section all working face is complete.
Advantages of the present invention is embodied in:
1, compared with the edge air gallery technology in existing non chain pillar entryprotection technology, in the present invention, stope drift active workings are directly caving, and need not safeguard, the contraction percentage of area is little, equally applicable at complex conditions such as high seam longwall top coal caving, the heavily stressed seam minings in deep；Adopt pre-pick to lead cave and carry out filling, lead cave both sides during filling and be entity coal, during filling need not two side templates, technique is simple, speed of application is fast.
2, top is directly connect owing to leading cave obturator and top board, goaf is filled with body isolation all the time, when can effectively prevent Tunnelling Along Goaf because of in goaf air leaking and goaf the harmful gas such as water and gas enter the goaf caused in tunnel get angry, the security incident such as tunnel retention of excessive fluid and gas explosion；Can effectively completely cut off goaf, it is prevented that goaf air leaking, it is to avoid goaf coal incidents of spontaneous combustion occurs, fire prevention is highly beneficial.
3, obturator adopts concrete filling material and reinforcing bar, and intensity is big, toughness is high, and it is effective to cut top, is conducive to reducing lateral roof pressure, essentially eliminates the tunnel unstable phenomenon because wall caving causes.
4, owing to the pre-buried artificial body of wall of cave is led in advance filling, the impact on working face mining slowly of filling velocity during gob side entry retaining is eliminated.
5, compared with the Tunnelling Along Goaf technology in existing non chain pillar entryprotection technology, without in goaf side filling or pile up waste pack when the present invention tunnels stope drift active workings, construction technology is simple, and tunnelling speed is fast.
6, owing to having completely abolished coal column, compared with future small coal pillar gob side entry driving technology, decrease the waste of coal resources, improve resource recovery.
In a word, the present invention as the side body of wall of stope drift active workings, not only achieves complete non chain pillar entryprotection by pre-buried artificial body of wall, and tunnelling and filling process are simple, becoming lane speed fast, little impact on production, stability and the safety of roadway surrounding rock are significantly improved.It addition, overall economic efficiency of the present invention is good, the strong adaptability to coal seam thickness, coal-mining method, condition of coal seam occurrence, roof and floor condition, auto-ignition and gas hydrologic condition etc., greatly expand the scope of application of non chain pillar entryprotection technology.
Accompanying drawing explanation
Fig. 1 is that the present invention digs in advance and leads cave plane of arrangement figure；
Fig. 2 be the present invention dig in advance lead cave arrange elevation；
Fig. 3 is that the present invention digs in advance and leads cave filling situation layout drawing；
Fig. 4 be the present invention dig in advance lead cave filling after form the elevation of artificial side；
Fig. 5 is the elevation after the present invention the first working face extraction tunnelling；
Fig. 6 is the elevation after the present invention the first working face extraction；
Fig. 7 is the elevation after the stope drift active workings driving of the present invention the second work surface；
Fig. 8 is the elevation after the present invention the second working face extraction；
Fig. 9 is that the present invention constructs floor map.
Under marginal data: 1-the first work surface, stope drift active workings lead cave；2-the first work surface；3-the second work surface；The artificial side of 4-the first work surface；Stope drift active workings on 5a-the first work surface；Stope drift active workings under 5b-the first work surface；Stope drift active workings on 6a-the second work surface；Stope drift active workings under 6b-the second work surface；7-filling section；The positive filling section of 8-；9-filling template；10-monomer supporting；11-grouting pipeline；12-filling pump；13-goaf；14-the 3rd work surface；Under 15-the second work surface, stope drift active workings lead cave；The artificial side of 16-the second work surface.
Detailed description of the invention
With reference to the accompanying drawings the present invention is described in further details.
As shown in figs 1-9, the pre-pick of the present invention is led cave filling artificial side secondary multiplexing roadside support and is become the lane method to be:
The first step: the driving of the first work surface upper and lower stope drift active workings 5a, 5b
1.1st step: under pre-pick the first work surface, stope drift active workings lead cave 1
As depicted in figs. 1 and 2, under the first work surface before stope drift active workings 5b driving, first the lower side position of stope drift active workings 5b under the first work surface, under the first work surface that driving 2m is wide, stope drift active workings lead cave 1, under first work surface, to lead stope drift active workings 5b under cave 1 and the first work surface contour isometric for stope drift active workings, and does gib；During gib, determine according to leading cave wall rock condition, wooden prop when wall rock condition is stablized, can be adopted, an intercolumniation array pitch 0.5-2.0m；Can adopt during wall rock condition instability individual prop+articulated roof beam supporting or adopt suspension roof support, adopt suspension roof support time therebetween, array pitch be carry out gib with monomer supporting 10 shown in 1.0-2.0m, Fig. 3；
1.2nd step: under the first work surface, stope drift active workings lead the filling of cave 1
As it is shown on figure 3, stope drift active workings are led after cave 1 tunneled under the first work surface, under the first work surface, stope drift active workings lead filling solidification material in cave 1, form the first artificial side 4 of work surface；
Solidification material by 100 parts of cement, the fluvial sand of 25 parts of granularity 5-10mm, the broken spoil of 50 parts of granularity 5-10mm, 140 parts of flyash, 2 parts of early strength agent, 2 parts of water reducers and suitable quantity of water mixing constitute, during filling in leading cave 1 a certain amount of reinforcing bar of interlaced arrangement；Requiring that obturator final setting time is not more than 3 hours, final set strength is not less than 2MPa, and within 28 days, intensity is not less than 30MPa.Be retrusive sublevel fill stoping during sublevel fill stoping, every 3-5m as one section, until before after filling section 7 initial set, draw back 3-5m, and a upper filling template 9, filler is positive filling section 8 after being delivered to by filling pump 12 and grouting pipeline 11；After every section of sand off, solidification carries out next section of filling in more than 3 hours again, until being filled up by whole cave 1 of leading, forming pre-buried artificial body of wall together, be called for short the first artificial side 4 (see Fig. 4) of work surface after solidification；
1.3rd step: under the first work surface, on stope drift active workings 5b and the first work surface, stope drift active workings 5a tunnels simultaneously
As shown in Figure 5, treat under the first work surface that stope drift active workings lead the whole filling of cave 1 complete, after solidification 1-2 month, tunneling stope drift active workings 5b under the first work surface along the first artificial side 4 of work surface, wherein the first artificial side 4 of work surface becomes the side body of wall of stope drift active workings 5b under the first work surface；Tunnel stope drift active workings 5a on the first work surface according to existing conventional method at section to be exploited simultaneously；
Second step: the first work surface 2 is exploited
After stope drift active workings 5b has arranged under first work surface, carry out the exploitation of the first work surface 2；Along with the exploitation of the first work surface 2, under the first work surface after exploitation, on stope drift active workings 5b and the first work surface, stope drift active workings 5a no longer safeguards, directly scraps, is caving gradually, together with goaf 13 as shown in Fig. 6 and Fig. 9；The goaf 13 being caving and the roof strata scrapping stope drift active workings are progressively stable；
3rd step: the driving of stope drift active workings 6b under stope drift active workings 6a and the second work surface on the second work surface
As shown in figures 7 and 9, stope drift active workings 6a on the second work surface is tunneled along the first work surface artificial side 4 opposite side again while the first work surface 2 exploitation or after the first work surface 2 has been exploited, the first artificial side 4 of work surface becomes the side body of wall of stope drift active workings 6a on the second work surface, under second work surface, stope drift active workings 6b driving carries out according to back production tunnelling method lower in above-mentioned steps two, first under pre-pick the second work surface, stope drift active workings lead cave 15, and fill formation the second artificial side 16 of work surface；
4th step: the second work surface 3 is exploited and the upper and lower stope drift active workings driving of the 3rd work surface 14 continues to use above-mentioned steps two and three respectively, after second work surface 3 has been exploited, on second work surface, under stope drift active workings 6a and the second work surface, stope drift active workings 6b is caving gradually together with goaf, the first artificial side 4 of work surface completes mission, as shown in Figure 8 and Figure 9；
By that analogy, until the exploitation of this section all working face is complete.
Claims (1)
1. a pre-pick is led cave filling artificial side secondary multiplexing roadside support and is become lane method, it is characterised in that
The first step: the driving of the first upper and lower stope drift active workings of work surface
1.1st step: under pre-pick the first work surface, stope drift active workings lead cave
Under the first work surface before back production tunnelling, first the lower side position of stope drift active workings under the first work surface, under driving wide the first work surface of 2m, stope drift active workings lead cave, and under the first work surface, to lead stope drift active workings under cave and the first work surface contour isometric for stope drift active workings, and does gib；
1.2nd step: under the first work surface, stope drift active workings lead the filling of cave
Under first work surface, stope drift active workings are led after cave tunneled, and under the first work surface, stope drift active workings lead filling solidification material in cave, form the first artificial side of work surface；
1.3rd step: the first upper and lower stope drift active workings of work surface tunnel simultaneously
Treat under the first work surface that stope drift active workings lead the whole filling of cave complete, after solidifying 1～2 month, stope drift active workings under the first work surface are tunneled along the first artificial side of work surface, wherein the first artificial side of work surface becomes the side body of wall of stope drift active workings under the first work surface, conventionally tunnels stope drift active workings on the first work surface simultaneously；
Second step: the first working face mining
After layout of actual mining roadway completes under first work surface, carry out the exploitation of the first work surface；Along with the exploitation of the first work surface, the first upper and lower stope drift active workings of work surface after exploitation are no longer safeguarded, directly scrap, are caving gradually together with goaf, and the goaf being caving is progressively stable with the roof strata scrapping stope drift active workings；
3rd step: the driving of the second upper and lower stope drift active workings of work surface
Stope drift active workings on the second work surface are tunneled along the first work surface artificial side opposite side again while the first working face mining or after the first working face mining is complete, the first artificial side of work surface becomes the side body of wall of stope drift active workings on the second work surface, and under the second work surface, back production tunnelling carries out according to back production tunnelling method under the first work surface in above-mentioned steps one；
4th step: the second working face mining and the upper and lower stope drift active workings driving of the 3rd work surface continue to use above-mentioned steps two and three respectively, by that analogy, until the exploitation of this section all working face is complete.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1701916A1 (en) * | 1990-03-20 | 1991-12-30 | Институт Горного Дела Ан Казсср | Method of mining inclined ore deposits |
| CN1804374A (en) * | 2006-01-06 | 2006-07-19 | 山东科技大学 | Method for preventing and controlling impact geopressure in longwall face gate of coal mine |
| RU2360114C1 (en) * | 2008-02-20 | 2009-06-27 | Государственное образовательное учреждение высшего профессионального образования "Санкт-Петербургский государственный горный институт имени Г.В. Плеханова (технический университет)" | Procedure for development of thick steeply-dipping deposits of unstable ore |
| CN101824985A (en) * | 2010-03-25 | 2010-09-08 | 巩庆刚 | Non-coal pillar mining method of protective coal pillars in coal mine |
| CN101864956A (en) * | 2010-04-08 | 2010-10-20 | 中国矿业大学 | Sectional coal pillar-free exploitation method |
| CN103195426A (en) * | 2013-04-22 | 2013-07-10 | 中国矿业大学(北京) | Steep-coal-seam long wall face non-pillar coal mining method |
| CN203756173U (en) * | 2014-02-25 | 2014-08-06 | 中国矿业大学(北京) | Delay filling original roadway coal-pillar-free gob-side entrydriving system |
-
2014
- 2014-06-28 CN CN201410300415.0A patent/CN104100271B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1701916A1 (en) * | 1990-03-20 | 1991-12-30 | Институт Горного Дела Ан Казсср | Method of mining inclined ore deposits |
| CN1804374A (en) * | 2006-01-06 | 2006-07-19 | 山东科技大学 | Method for preventing and controlling impact geopressure in longwall face gate of coal mine |
| RU2360114C1 (en) * | 2008-02-20 | 2009-06-27 | Государственное образовательное учреждение высшего профессионального образования "Санкт-Петербургский государственный горный институт имени Г.В. Плеханова (технический университет)" | Procedure for development of thick steeply-dipping deposits of unstable ore |
| CN101824985A (en) * | 2010-03-25 | 2010-09-08 | 巩庆刚 | Non-coal pillar mining method of protective coal pillars in coal mine |
| CN101864956A (en) * | 2010-04-08 | 2010-10-20 | 中国矿业大学 | Sectional coal pillar-free exploitation method |
| CN103195426A (en) * | 2013-04-22 | 2013-07-10 | 中国矿业大学(北京) | Steep-coal-seam long wall face non-pillar coal mining method |
| CN203756173U (en) * | 2014-02-25 | 2014-08-06 | 中国矿业大学(北京) | Delay filling original roadway coal-pillar-free gob-side entrydriving system |
Non-Patent Citations (1)
| Title |
|---|
| 原巷充填无煤柱掘巷技术研究;史文豹;《安徽理工大学硕士毕业论文》;20140601;9-10 * |
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