CN103244122B - Trinity coupling support stability control method for gob-side entry-driving coal pillar - Google Patents
Trinity coupling support stability control method for gob-side entry-driving coal pillar Download PDFInfo
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- CN103244122B CN103244122B CN201310173332.5A CN201310173332A CN103244122B CN 103244122 B CN103244122 B CN 103244122B CN 201310173332 A CN201310173332 A CN 201310173332A CN 103244122 B CN103244122 B CN 103244122B
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- 239000003245 coal Substances 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000008878 coupling Effects 0.000 title claims abstract description 11
- 238000010168 coupling process Methods 0.000 title claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 11
- 239000011435 rock Substances 0.000 claims abstract description 17
- 230000008093 supporting effect Effects 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 9
- 238000006073 displacement reaction Methods 0.000 claims abstract description 7
- 230000003245 working effect Effects 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 4
- 238000007569 slipcasting Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 238000004873 anchoring Methods 0.000 abstract 2
- 238000000926 separation method Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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Abstract
The invention provides a trinity coupling support stability control method for a gob-side entry-driving coal pillar, which is particularly suitable for a large-deformation gob-side roadway with an unstable overlying rock. A pre-stress threaded steel anchor rod is used on the gob-side entry-driving coal pillar on an upper zone roadway coal pillar side to tension a coal pillar goaf-side coal body; a short anchor rod on a lower zone gob-side entry-driving coal pillar side is used for controlling the integrity of a whole displacement region of a coal pillar roadway side; and meanwhile, a long grouting anchor cable is matched to reinforce an anchoring point so as to limit the development of an inner separation layer in the whole displacement region. A range of generating a crushed region of the coal pillar under the effect of lateral supporting pressure can be relieved under the expression of a haling effect of the pre-stress threaded steel anchor rod, so as to prevent an instability state of the coal pillar from worsening; and 'controlling by the short rod and grouting by the long rod' of the short anchor rod and the long grouting anchor cable are given into fully play so as to prevent a coal pillar support structure from losing effect and re-achieve the supporting capability of a remained anchoring structure in the coal pillar, so that coupling support with alternative anchor net support and anchor grouting support is formed between the gob-side entry-driving coal pillar side and a goaf side.
Description
Technical field
The present invention relates to a kind of stability of coal pillar control method, especially a kind of gob side entry driving stability of coal pillar Trinity coupling supporting control method being applicable to large deformation under the unstable overlying rock of underground coal mine.
Background technology
The basis that gob side entry driving technology is developed rapidly is the Surrounding Rock Control Technology of gob side entry driving, and keep thin coal pillar stable be the key of gob side entry driving Surrounding Rock Control, the at present research of relevant gob side entry driving thin coal pillar stability control technology focus mostly on the coal pillar width before pick lane and after digging lane coal column support technology etc. in, also do not consider unified for the roadway surrounding rock control measure during the roadway support of upper curtate, gob side entry driving and this work plane mining influence overall process, comprehensively determine gob side entry stability of coal pillar technology.And this type of research is all based upon on a basic condition, namely along the driving in tunnel, empty side be upper curtate goaf stability of overlying rock strata or basicly stable after carry out, by contrast, due to the restriction by field trial condition, still little for the research of gob side entry driving Surrounding Rock Control Technology under unstable overlying strata.Especially, nervous situation is taken over to alleviate production in some collieries in recent years, when upper curtate work plane goaf overlying rock is not yet fully stable, namely by staying the driving establishing thin coal pillar to carry out lower curtate working face extraction tunnel along goaf.This situation is called as gob side entry driving under unstable overlying strata.Upper curtate goaf is under the fully unstable condition of overlying rock, goaf side does not also form stable remaining bearing pressure in coal body, ore deposit pressure manifests still unstable, namely generally there is significantly distortion in the gob side entry now along goaf driving, during this working face mining, affect by lead abutment pressure during tunneling, roadway deformation destroys even more serious, even need to expand side and could meet production requirement, gently then increase cost of production, heavy then bring potential safety hazard.Gob side entry driving, the gob side entry driving stability of coal pillar control under especially unstable overlying strata is the key of gob side entry driving Surrounding Rock Control under this condition, needs new approaches to instruct the new technical scheme of lower employing just can reach target.
Summary of the invention
Technical problem: object of the present invention in prior art problem, there is provided the surrouding rock deformation of a kind of effective control gob side entry driving and thin coal pillar stability, ensure the gob side entry driving stability of coal pillar Trinity coupling supporting control method that downhole safety is produced, the method is mainly for gob side entry driving.
Technical scheme: gob side entry driving stability of coal pillar Trinity coupling supporting control method of the present invention, comprises above step:
A, upper curtate stope drift active workings driving and supporting construction process in, when upper curtate work plane goaf overlying rock is not yet fully stable, in upper curtate stope drift active workings coal column side, many prestressing force twisted steel anchor rods are installed, utilize prestressing force twisted steel anchor rod anchorage effect to strain side, coal column tunnel coal body;
B, in lower curtate gob side entry driving process, carry out lower curtate work plane gob side entry driving, at lower curtate gob side entry coal column side prestressed Short bolt, adopt the extensible bolting mode;
C, in lower curtate work plane gob side entry driving process, while the prestressing force Short bolt of installation gob side entry driving coal column side, grouting cable anchor is installed on lower curtate gob side entry coal column side, grouting cable anchor is utilized to implement slip casting to coal column, the anchor point of grouting cable anchor is deep in the motionless district of coal column, side, coal column tunnel coal body, coal column goaf side coal body displacement field and the motionless district of coal column are reinforced.
Beneficial effect: the roadway support of upper curtate is tunneled so that the roadway surrounding rock control measure unification during work plane mining influence overall process is considered to gob side entry by the present invention, determine comprehensive gob side entry stability of coal pillar control technology scheme, controlled by " hale, short control, long note " Trinity coupling supporting, be specially: during (1) upper curtate tunnelling, adopt in coal column side high-strength prestressed twisted steel anchor rod to strain coal column goaf side coal body.The high-strength prestressed twisted steel anchor rod in upper curtate chain pillar side " hales " performance acted on can slow down the scope that coal column produces fracture area under the effect of lateral-supporting pressure, prevent the deterioration of coal column instability status, avoid anchor rod pallet board and the body of rod occur drawing bad, the problem such as to break, provide possibility for anchor pole after gob side entry driving plays anchorage effect again.(2), during lower curtate gob side entry driving, Short bolt is adopted to control the integrality in global displacement district, side, coal column tunnel in chain pillar side.(3) during lower curtate gob side entry driving, long grouting cable anchor is adopted to reinforce anchor point in chain pillar side, the growth of absciss layer in restriction global displacement district.What Short bolt and long grouting cable anchor " short control, length are noted " acted on gives full play to the inefficacy effectively can avoiding coal column supporting and protection structure, again plays the support capacity leaving over anchor structure in coal column, to reach the effect jointly safeguarding stability of coal pillar.The present invention effectively can not only avoid the inefficacy of coal column supporting and protection structure, and in coal column, when again can play upper curtate roadway support, leave over the support capacity of anchor structure, for the maintenance of gob side entry driving stability of coal pillar and roadway surrounding rock control, there is important directive significance, the method construction technology is easy, support material economy, supporting effect is remarkable, has practicality widely.
Accompanying drawing explanation
Fig. 1 is principle schematic of the present invention.
In figure: 1-long grouting cable anchor, 2-prestressing force Short bolt, 3-lower curtate work plane, 4-lower curtate gob side entry, side, 5-coal column tunnel coal body, the motionless district of 6-coal column, 7-coal column goaf side coal body, 8-prestressing force twisted steel anchor rod, 9-upper curtate stope drift active workings, 10-upper curtate work plane goaf.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
1) in upper curtate stope drift active workings driving and supporting construction process, when upper curtate work plane goaf 10 overlying rock is not yet fully stable, " hale, short control, long note " Trinitarian coupling supporting is carried out along chain pillar side, empty side to large deformation, prestressing force twisted steel anchor rod 8 is installed on upper curtate stope drift active workings 9 coal column side; Prestressing force twisted steel anchor rod 8 anchorage effect is utilized to strain side, coal column tunnel coal body 5;
2) in lower curtate gob side entry driving process, lower curtate work plane 3 gob side entry driving can be carried out when upper curtate work plane goaf 10 overlying rock is not yet fully stable, prestressing force Short bolt 2 is installed on lower curtate gob side entry 4 coal column side, adopt the extensible bolting mode, the stability of coal column is controlled by the motionless district 6 of gob side entry driving coal column, i.e. horizontal movement change very small region in gob side entry driving coal column, its coal body integrality all needs to be guaranteed, and no longer produces large absciss layer;
3) in lower curtate work plane 3 gob side entry driving process, while gob side entry driving coal column side prestressing force Short bolt 2 is installed, long grouting cable anchor 1 is installed on lower curtate gob side entry 4 coal column side, long grouting cable anchor 1 pair of coal column is utilized to implement slip casting, its anchor point should be deep in the motionless district 6 of coal column, to reinforce side, coal column tunnel coal body 5, coal column goaf side coal body 7 displacement field and the motionless district 6 of coal column; By prestressing force twisted steel anchor rod 8, prestressing force Short bolt 2 and long grouting cable anchor 1 with the use of the coupling supporting making to be formed between side, lower curtate gob side entry driving coal column tunnel and goaf side bolting with wire mesh and bolt-grouting support and replace, complete at lower curtate gob side entry driving and lower curtate working face extraction.
Claims (1)
1. a gob side entry driving stability of coal pillar Trinity coupling supporting control method, is characterized in that comprising the steps:
A, upper curtate stope drift active workings driving and supporting construction process in, when upper curtate work plane goaf (10) overlying rock is not yet fully stable, many prestressing force twisted steel anchor rods (8) are installed in upper curtate stope drift active workings (9) coal column side, utilize prestressing force twisted steel anchor rod (8) anchorage effect to strain side, upper curtate coal column tunnel coal body (5);
B, in lower curtate gob side entry driving process, carry out lower curtate work plane (3) gob side entry driving, in lower curtate gob side entry (4) coal column side prestressed Short bolt (2), adopt the extensible bolting mode;
C, in lower curtate work plane (3) gob side entry driving process, while installation gob side entry driving coal column side prestressing force Short bolt (2), grouting cable anchor (1) is installed on lower curtate gob side entry (4) coal column side, grouting cable anchor (1) is utilized to implement slip casting to coal column, the anchor point of grouting cable anchor (1) is deep in the motionless district of coal column (6), side, coal column tunnel coal body (5), coal column goaf side coal body (7) displacement field and the motionless district of coal column (6) are reinforced.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310173332.5A CN103244122B (en) | 2013-05-13 | 2013-05-13 | Trinity coupling support stability control method for gob-side entry-driving coal pillar |
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| CN201310173332.5A CN103244122B (en) | 2013-05-13 | 2013-05-13 | Trinity coupling support stability control method for gob-side entry-driving coal pillar |
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| CN103244122A CN103244122A (en) | 2013-08-14 |
| CN103244122B true CN103244122B (en) | 2015-01-21 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103899342A (en) * | 2014-04-15 | 2014-07-02 | 中国矿业大学(北京) | Gob-side entrydriving coal pillar anchor cable through reinforcing method |
| CN104533482B (en) * | 2014-10-28 | 2016-08-31 | 淮浙煤电有限责任公司顾北煤矿分公司 | A kind of reinforcement means improving gob side entry driving fender stability |
| CN104712348B (en) * | 2014-12-11 | 2019-03-29 | 山东科技大学 | Large-mining-height working surface is along empty fender laneway support method under the hard direct top of one kind |
| CN105422128A (en) * | 2015-12-14 | 2016-03-23 | 山东科技大学 | Method for preventing goaf gas leakage in deep shaft gob-side entry driving |
| CN106894833B (en) | 2017-01-23 | 2018-04-06 | 山东科技大学 | Gob side entry driving unbalanced support structure and construction method under the unstable overlying strata in deep |
| CN108060921B (en) * | 2017-11-30 | 2020-11-24 | 山西工程技术学院 | Thick coal seam gob-side roadway bottom coal recovery method based on narrow coal pillar heave effect |
| CN108049899A (en) * | 2017-12-06 | 2018-05-18 | 中国矿业大学(北京) | A kind of gob side entry driving thin coal pillar breaking surrounding rock reinforcement means |
| CN108757022A (en) * | 2018-05-29 | 2018-11-06 | 中国煤炭地质总局勘查研究总院 | The restorative procedure of mined-out region |
| CN111365021B (en) * | 2020-03-26 | 2021-02-09 | 中国矿业大学(北京) | Pre-grouting solidification method for narrow coal pillars of fully mechanized caving coal roadway |
| CN111364995B (en) * | 2020-03-26 | 2021-02-12 | 中国矿业大学(北京) | Construction method of fully mechanized caving coal roadway stable roof-coal pillar structure |
| CN112267884B (en) * | 2020-10-27 | 2022-09-16 | 陕西煤业化工技术研究院有限责任公司 | Composite nano grouting sealing-based gob-side entry driving construction method for remaining small coal pillar |
| CN114000902B (en) * | 2021-09-22 | 2022-12-27 | 中国矿业大学(北京) | Method for suspension maintenance of broken roof of negative coal pillar roadway by grouting reinforced anchor rod |
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| CN101122235B (en) * | 2007-10-31 | 2010-05-19 | 中国矿业大学 | Method for controlling wall rock of fully mechanized coal face goaf side coalbed laneway |
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Owner name: BAODIAN COAL MINE YANZHOU COAL MINING COMPANY LTD. Effective date: 20141205 |
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Effective date of registration: 20141205 Address after: 221116 Research Institute, China University of Mining and Technology, Xuzhou University, Jiangsu, China, Applicant after: China University of Mining & Technology Applicant after: Baodian Coal Mine, Yanzhou Coal Mining Company Limited Address before: 221116 Research Institute, China University of Mining and Technology, Xuzhou University, Jiangsu, China, Applicant before: China University of Mining & Technology |
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