CN103291301A - Pilot-tunneling method for coal uncovering - Google Patents
Pilot-tunneling method for coal uncovering Download PDFInfo
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- CN103291301A CN103291301A CN2012100398895A CN201210039889A CN103291301A CN 103291301 A CN103291301 A CN 103291301A CN 2012100398895 A CN2012100398895 A CN 2012100398895A CN 201210039889 A CN201210039889 A CN 201210039889A CN 103291301 A CN103291301 A CN 103291301A
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Abstract
The invention relates to a pilot-tunneling method for coal uncovering, and belongs to the technical field of mine sinking and driving engineering. The method helps to solve problems that: when an uncovered outburst coal seam has a laneway sectional area more than 10m<2> or an inclined angle from the laneway to the coal seam less than 40 DEG, safe rock pillars for working face brush expension are difficult to control, shot holes are deep, explosive consumption is large, and vibration induced protrusion is easy to happen. Safe and effective coal uncovering is realized by that: the laneway sectional area is reduced, the angle of pilot-tunneling is changed, and technologies of smooth blasting, anchor-net temporary supporting and anchor-net permanent supporting etc. are employed. The method of the invention is especially suitable for coal uncovering when the laneway sectional area is large, surrounding rocks are broken, and the inclined angle is small. Advantages are that: working places need no finishing, the pilot-tunneling is flexible for operation, so that drilling by pneumatic drills is convenient, the safe rock pillars are easy to control, and operation is simple; uncovered sectional area is small, the number of working people is small, the number of blast hole is small, the amount of explosive is small, blasting disturbance is less, gas emission amount is small, and the safety is high; pilot-tunneling sectional area is small, operation technology is simple, speed is fast, and work efficiency is high.
Description
Technical field
Patent of the present invention relates to the mine tunnel engineering technical field, specifically is a kind of job practices of taking off projecting coal bed (hereinafter to be referred as exposed coal)
Background technology
In southwests, particularly Chongqing such as China Sichuan, Chengdu, Chongqing, coal and gas are outstanding more serious.During exposed coal, at first measure projecting coal bed basic parameter, survey geological condition, implement regional complex protrusion-dispelling and local outburst prevention measures again, at last at distance coal seam length of normal 1.5m or 2m length of normal place, with the work plane brush tiltedly, the cloth eye disposable coal seam of opening of explosion of breaking entirely again.
When drift section greater than 10m
2Or tunnel and the coal seam angle of cut are during less than 40 °, its exposed coal exists shortcoming very obvious: 1. borehole number many, 2. the dark 2-10m of eyelet, 3. the many 150-300Kg of dosage, 4. concussion of blasting is big, easily cause to the roadway surrounding rock structural deterioration so that jeopardize safety, when 5. brushing the slanting face, safe rock pillar is wayward, operation easier is big, and construction speed is slow.
Summary of the invention
The objective of the invention is to reduce the safe rock pillar control of exposed coal difficulty, shorten borehole depth and open the coal seam area, reduce concussion of blasting, reduce explosion to the roadway surrounding rock structural deterioration, improve and take off projecting coal bed safety and efficiency of construction.
Main contents of the present invention:
With the large section roadway exposed coal, change light section tunnel exposed coal into, and the exposed coal borehole is vertical with the coal seam as far as possible, comprise light section roadway shape, position and construction angle; Smooth blasting, explosive charge control; Temporary lining; Brush expands the tunnel; Permanent support.It is characterized in that: tunnelling is opened the coal seam with the light section tunnel again to the safe rock pillar that regulation requires, and carries out temporary lining to opening the coal seam part, and brushing is to design section and finish permanent support then.
The present invention has following apparent remarkable advantage compared with prior art: 1. simple to operate flexible, and lead cave position, size, angle and shape and can decide in conjunction with the concrete characteristics of engineering according to the construction needs.2. when tunnel and the little angle of cut in coal seam, if want full section to open the coal seam, then necessary finishing process face can satisfy and adopt common air drill jewel hole.Lead the cave exposed coal and then can not repair the inclined-plane, directly open the coal seam with common air drill perforating explosion, shortened the exposed coal time.Big gun hole number and dosage when 3. having reduced exposed coal, the vibration in the time of also certainly will reducing explosion or destruction are reduced and are brought out coal and the outstanding probability of gas.4. reduce detonator quantity, reduced blasting network resistance, available common blaster detonates, and has improved safety and the reliability of explosion widely.5. owing to the section of opening the coal seam is little, the corresponding minimizing of gas emission has alleviated ventilation pressure, also certainly will reduce the number of times of gas exceeding limit.Increase coal and the gas resistance when outstanding simultaneously, thereby safety improves greatly.6. because to lead cave exposed coal section little, speed is fast, and the operating personnel that participate in down-hole exposed coal operation are corresponding less, and harmfulness reduces.
Description of drawings
The former technology exposed coal figure of accompanying drawing 1 for the present invention relates to
Accompanying drawing 2 is led cave exposed coal figure for what the present invention relates to
The specific embodiment
By reference to the accompanying drawings, the present invention is described in further detail by example:
Referring to Fig. 1, former exposed coal technology is made up of following part: regulation rock pillar (1.5m) stops operation; Conditioning brush slanting face I; Cloth eye exposed coal forms II; To opening coal seam part III temporary lining; Permanent support.
Referring to Fig. 2, the tunnel exposed coal technology that the present invention relates to is made up of following part: cave I is led in the construction of regulation rock pillar; Open coal seam formation and lead cave II; Carry out temporary lining to disclosing coal seam III; Brush expands the tunnel to design section; Permanent support.
Sequence of construction of the present invention is as follows:
1) at 1.5m rock pillar place, construction is led cave (being light section) to stipulating the rock pillar place;
2) change and to lead cave construction angle, arrange the exposed coal borehole, disposable open projecting coal bed;
3) carry out temporary lining to disclosing the coal seam;
4) the brush expansion does not reach the part section tunnel of design section, and carries out permanent support;
5) ort prediction does not exceed standard and then crosses ort to going out the projecting coal bed end or top board 2m rock pillar, finishes and takes off projecting coal bed construction.
In above-mentioned job practices, 1) step is according to this rock property, stability, support material and the technology etc. of slagging tap, and can select shapes such as circle, basket handle arch, semicircular arch, trapezoidal, rectangle to lead cave.
In above-mentioned job practices, 2) when the step, layout was led cave II angle, should consider to make things convenient for the exposed coal borehole to arrange as far as possible, dwindle factors such as borehole depth.The blasting parameter design principles is: borehole is suitable shallow unsuitable dark, adopts smooth blasting, strict control explosive payload, and millisecond detonator segmentation millisecond detonating reduces explosion vibration velocity.
In above-mentioned job practices, 3) step temporary lining adopts the anchor net will disclose the whole sealing in coal seam, prevents that brush from expanding the tunnel and blowing out to shake and cause and collapse.
In above-mentioned job practices, 4) every brush of step expands a circulation and must carry out permanent support, particularly coal seam section tunnel immediately, must carry out filling to top, group space during supporting.
Claims (5)
1. take off projecting coal bed job practices safely and fast for one kind, this method comprises the steps:
Cave I is led in the construction of regulation rock pillar, opens coal seam formation and leads cave II, carries out temporary lining to disclosing coal seam III, and brush expands the tunnel to design section, permanent support.
2. method according to claim 1 is characterized in that changing big section into light section at regulation rock pillar place leads the cave driving, in conjunction with smooth blasting and temporary lining, reduces the explosion influence, immediate support, realize safe and efficient take off projecting coal bed.
3. method according to claim 2, it is characterized in that section greater than 10m2 or tunnel and the coal seam angle of cut less than 40 °, comprise gallery, inclined gallery or inclined shaft, vertical shaft etc.
4. method according to claim 2 is characterized in that leading cave size, shape, position, angle etc., by rock property, seam inclination, coal petrography degree of crushing, construction technology etc. analyses are determined, leads cave size 4-9m
2, the optional rectangle of shape, trapezoidal, semicircular arch, basket handle arch, the position can be selected in left side, centre or right side, and angle should be selected perpendicular to the coal seam to the greatest extent when exposed coal.
5. method according to claim 2 is characterized in that taking off projecting coal bed rock blasting, and blasting parameter is according to analysis-by-synthesis such as country rock and seam hardness coefficient, seam inclination, explosion influences, by calculating value.Principle is: by smooth blasting cloth eye, borehole is suitable shallow unsuitable dark, and millisecond detonator segmentation millisecond detonating reduces explosion vibration velocity.Advance of working cycle 0.8-1.5m, exposed coal big gun explosive payload 20-100Kg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100398895A CN103291301A (en) | 2012-02-22 | 2012-02-22 | Pilot-tunneling method for coal uncovering |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100398895A CN103291301A (en) | 2012-02-22 | 2012-02-22 | Pilot-tunneling method for coal uncovering |
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| CN103291301A true CN103291301A (en) | 2013-09-11 |
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| CN2012100398895A Pending CN103291301A (en) | 2012-02-22 | 2012-02-22 | Pilot-tunneling method for coal uncovering |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103726847A (en) * | 2013-12-26 | 2014-04-16 | 贵州晨辉达矿业工程设计有限公司 | Downhole jade ore mining method |
| CN112610250A (en) * | 2020-12-14 | 2021-04-06 | 中铁隧道局集团有限公司 | Method for dismantling three rock pillar supports of large-span underground cave depot |
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| CN102242640A (en) * | 2011-07-05 | 2011-11-16 | 河南煤业化工集团研究院有限责任公司 | Rapid outburst elimination method for cross cut coal uncovering in coal mine underground |
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| CN102174892A (en) * | 2011-03-10 | 2011-09-07 | 贵州铸安矿山科技股份有限公司 | Rotary cutting type cross-cut coal uncovering method |
| CN102242640A (en) * | 2011-07-05 | 2011-11-16 | 河南煤业化工集团研究院有限责任公司 | Rapid outburst elimination method for cross cut coal uncovering in coal mine underground |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103726847A (en) * | 2013-12-26 | 2014-04-16 | 贵州晨辉达矿业工程设计有限公司 | Downhole jade ore mining method |
| CN103726847B (en) * | 2013-12-26 | 2016-04-13 | 贵州晨辉达矿业工程设计有限公司 | A kind of downhole jade ore deposit mining methods |
| CN112610250A (en) * | 2020-12-14 | 2021-04-06 | 中铁隧道局集团有限公司 | Method for dismantling three rock pillar supports of large-span underground cave depot |
| CN112610250B (en) * | 2020-12-14 | 2021-12-24 | 中铁隧道局集团有限公司 | Method for dismantling three rock pillar supports of large-span underground cave depot |
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Application publication date: 20130911 |