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 PDF

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Publication number
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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China
Prior art keywords
gob
coal
entry
curtate
coal pillar
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CN201310173332.5A
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Chinese (zh)
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CN103244122A (en
Inventor
张源
万志军
裴松
李付臣
国峰
李华
周长冰
程敬义
赵永亮
Original Assignee
中国矿业大学
兖州煤业股份有限公司鲍店煤矿
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Priority to CN201310173332.5A priority Critical patent/CN103244122B/en
Publication of CN103244122A publication Critical patent/CN103244122A/en
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Publication of CN103244122B publication Critical patent/CN103244122B/en

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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

Gob side entry driving stability of coal pillar Trinity coupling supporting control method

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.
CN201310173332.5A 2013-05-13 2013-05-13 Trinity coupling support stability control method for gob-side entry-driving coal pillar CN103244122B (en)

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* Cited by examiner, † Cited by third party
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

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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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