CN103278055B - Roof-cutting pressure relief method in hard-roof deep-hole pre-splitting blasting - Google Patents

Roof-cutting pressure relief method in hard-roof deep-hole pre-splitting blasting Download PDF

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Publication number
CN103278055B
CN103278055B CN201310216309.XA CN201310216309A CN103278055B CN 103278055 B CN103278055 B CN 103278055B CN 201310216309 A CN201310216309 A CN 201310216309A CN 103278055 B CN103278055 B CN 103278055B
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China
Prior art keywords
hole
roof
seam
blast hole
blast
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CN201310216309.XA
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Chinese (zh)
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CN103278055A (en
Inventor
张宏伟
朱志洁
陈蓥
霍丙杰
兰天伟
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辽宁工程技术大学
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Publication of CN103278055A publication Critical patent/CN103278055A/en
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Abstract

The invention relates to a roof-cutting pressure relief method in hard-roof deep-hole pre-splitting blasting, belongs to the technical field of blasting pressure relief, relates to a method of controlling coal pillar stress concentration and intense gob-side entry strata behaviors caused by suspension of gob hard roofs in thick seams and super high seams, and solves such problems of coal pillar stress concentration and intense gob-side entry strata behaviors caused by suspension of gob hard roofs in thick seams and super high seams. The method is effective and widely applicable and includes the steps of firstly, reserving a roof-cutting roadway in coal pillars along a seam roof before working face extraction in case of the seam being the super high seam; if the seam is the thick seam, directly using a mining roadway as a roof-cutting roadway; secondly, if the seam is the super high seam, longitudinally reserving blast holes in the roof strata above the roof-cutting roadway; and thirdly, loading explosives, sealing the holes and allowing for roof-cutting blasting.

Description

A kind of tight roof Deephole pre-splitting blasting cuts top pressure relief method

Technical field

The invention belongs to Relieving Shot field, relate to a kind of high seam and super high seam goaf tight roof to hang and push up the stress of coal pillar caused and to concentrate and gob side entry ore deposit pressure manifests strong prevention and controls, particularly relate to a kind of tight roof Deephole pre-splitting blasting and cut top pressure relief method.

Background technology

In high seam and super high seam exploitation, when particularly top board is multi-layered thickness larger competent bed, along with working face is pushed ahead, it is outstanding and do not collapse with coal column to be that the strong point forms the cantilever beam of certain length, supports overlying rock.Along with working face periodic weighting, this layer of top board tilts to goaf at a certain angle, the spoil of inbreak is difficult to be full of goaf, side direction concentrated stress increases, coal column edge coal body destroys, concentrated stress shifts to deep, causes the strong ore deposit pressures such as the sinking of contiguous working face extraction back, pucking, anchor pole (rope) fracture to manifest, easily brings out rock blast hazard time serious.For addressing this problem, with the method for passive increasing width of chain pillar and strengthening supporting, adopt ensures that roadway surrounding rock is stablized more, and these methods fail to solve this problem from basic, and waste coal resources.

Summary of the invention

For prior art Problems existing, the invention provides a kind of tight roof Deephole pre-splitting blasting and cut top pressure relief method, this method solve high seam and super high seam goaf tight roof to hang and push up the stress of coal pillar caused and to concentrate and gob side entry ore deposit pressure manifests the problems such as strong, successful, has practicality widely.

To achieve these goals, the present invention adopts following technical scheme: a kind of tight roof Deephole pre-splitting blasting cuts top pressure relief method, comprises the steps:

Step one: arrange and cut tunnel, top

If coal seam thickness is greater than 8m, be super high seam, before working face extraction, arrange along roof in coal column and cut tunnel, top, and be 7m ~ 9m with the horizontal separation of stope drift active workings;

If coal seam thickness is 3.5m ~ 8m, be high seam, then direct using described stope drift active workings as cut top tunnel;

Step 2: arrange blast hole

If coal seam is super high seam, cut top tunnel above roof strata in be vertically arranged with several tilt blast hole; If coal seam is high seam, in the coal seam of cutting above tunnel, top and roof strata, be vertically arranged with several blast holes tilted;

Blast hole and roof angle are 30 ° ~ 80 °, and be 3 ~ 5 times of coal seam thickness to the vertical range of cutting top back at the bottom of blast hole hole, blast hole diameter is 60mm ~ 90mm;

Step 3: powder charge sealing of hole and cut top explosion

Powder charge in blast hole also by stemming sealing of hole, is implemented to cut top explosion; Loaded length is 0.6 ~ 0.75 times of blast hole hole depth, and stemming filling length is 0.25 ~ 0.4 times of blast hole hole depth.

Described blast hole is arranged on to be cut above tunnel, top and in the roof strata helped near the stope drift active workings tunnel adjacent with coal column.

Described blast hole is arranged in same plane.

Distance between described adjacent blast hole is 3m ~ 5m.

Centre position between described adjacent blast hole is provided with control hole in parallel, and the diameter of control hole is 80mm ~ 100mm; Control hole hole depth is all identical with blast hole hole depth, and after setting up control hole, the distance between described adjacent blast hole is 8m ~ 10m; Described control hole does not need charge explosion, controls the direction of explosion energy effect on the one hand, improves the utilization rate of explosion energy, improve the effect of explosion; Serve the effect of compensation space on the other hand, what the coal body after explosion was destroyed relatively evenly by compacting again, can not produce the phenomenon of a larger compression ring after eliminating deep hole standing shot.

Beneficial effect of the present invention:

The present invention carries out presplit blasting to tight roof and cuts top, destroys the integrality of tight roof.Along with the propelling of working face, tight roof is along the crack fracture that presplit blasting produces, and destroy the cantilever beam structure of working face side direction top board, thus stress of coal pillar is reduced, plastic failure area reduces, and improves stability of coal pillar; The surrouding rock stress in contiguous working face extraction tunnel reduces, and roadway deformation and destructiveness be corresponding reduction also, decreases tunnel and overhauls number of times.Present invention, avoiding and hang top due to tight roof large area and cause stress of coal pillar to be concentrated and the impulsion pressure disaster of bringing out.Successful of the present invention, has practicality widely.

Accompanying drawing explanation

Fig. 1 is for adopting super high seam coal petrography section structure schematic diagram of the present invention;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the B-B sectional view of Fig. 2;

Fig. 4 is for adopting high seam coal petrography section structure schematic diagram of the present invention;

Fig. 5 is the C-C sectional view of Fig. 4;

Fig. 6 is the D-D sectional view of Fig. 5;

Wherein, 1-stope drift active workings, 2-cut tunnel, top, 3-coal column, 4-blast hole, 5-control hole, 6-working face, 7--coal seam, 8--roof strata;

α--blast hole (control hole) and roof angle, distance between W-adjacent blast hole, to the vertical range of cutting top back at the bottom of H--blast hole (control hole) hole, M--coal seam thickness, D1--blast hole diameter, D2--control hole diameter, L--blast hole (control hole) hole depth, S--cuts the horizontal separation between tunnel, top and stope drift active workings.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.

Embodiment one:

As shown in FIG. 1 to 3, the present embodiment coal seam thickness M is 10m, specifically comprises the following steps:

Step one: arrange and cut tunnel 2, top

Described coal seam 7 is super high seam 7, therefore before working face 6 back production, in coal column 3, cuts tunnel 2, top along coal seam 7 top board driving, and the horizontal separation S cut between tunnel, top and stope drift active workings is 7m;

Step 2: arrange blast hole 4 and control hole 5

Whole piece cuts the blast hole 4 and the control hole 5 that longitudinally arrange inclination in the roof strata 8 above tunnel 2, top, and control hole 5 is arranged on the centre position between adjacent blast hole 4; Blast hole 4 and control hole 5 aperture push ups tunnel 2 and helps near the tunnel of working face 6 apart from being 1.5m with cutting, stope drift active workings 1 are arranged in the tunnel side place perpendicular of coal column 3 at the bottom of hole, blast hole 4 and control hole 5 be arranged in parallel in same plane, blast hole (control hole) and roof angle α are 45 °, distance W between adjacent blast hole is 10m, at the bottom of blast hole (control hole) hole to cut top back vertical range H be 50m, blast hole diameter D1 is 85mm, control hole diameter D2 is 90mm, and blast hole (control hole) hole depth L is 70m;

Step 3: powder charge sealing of hole and cut top explosion

Adopt continuous coupled mode to carry out powder charge to blast hole 4, loaded length is 49m, and adopt stemming to carry out sealing of hole, stemming is made up of water stemming material and yellow mud, and sealed borehole length is 21m.Adopt double detonator, two primacord to ignite, explosion explosive used is three grades of emulsion explosive for coal mine, explosive specification 70mm × 500mm, implements to cut top bursting work.

Embodiment two:

As shown in Fig. 4 ~ Fig. 5, the present embodiment coal seam thickness M is 5m, specifically comprises the following steps:

Step one: arrange and cut tunnel 2, top

Described coal seam 7 is high seam 7, using described stope drift active workings 1 as cutting tunnel 2, top;

Step 2: arrange blast hole 4 and control hole 5

Whole piece is cut in coal seam 7 above tunnel 2, top and roof strata 8 and is vertically arranged with blast hole 4 and the control hole 5 of inclination, and control hole 5 is arranged on the centre position between adjacent blast hole 4; Blast hole 4 and control hole 5 with cut that to push up the distance helped in tunnel, tunnel 2 be 1.5m near coal column 3, blast hole 4 and control hole 5 be arranged in parallel in same perpendicular, blast hole (control hole) and roof angle α are 45 °, distance W between adjacent blast hole is 10m, at the bottom of blast hole (control hole) hole to cut top back vertical range H be 25m, blast hole diameter D1 is 85mm, and control hole diameter D2 is 90mm, and blast hole (control hole) hole depth L is 35m;

Step 3: powder charge sealing of hole and cut top explosion

Adopt continuous coupled mode to carry out powder charge to blast hole 4, loaded length is 24m, and adopt stemming to carry out sealing of hole, stemming is made up of water stemming material and yellow mud, and sealed borehole length is 11m.Adopt double detonator, two primacord to ignite, explosion explosive used is three grades of emulsion explosive for coal mine, explosive specification 70mm × 500mm, implements to cut top bursting work.

Claims (4)

1. tight roof Deephole pre-splitting blasting cuts a top pressure relief method, it is characterized in that comprising the steps:
Step one: arrange and cut tunnel, top
If coal seam thickness is greater than 8m, be super high seam, before working face extraction, arrange along roof in coal column and cut tunnel, top, and be 7m ~ 9m with the horizontal separation of stope drift active workings;
If coal seam thickness is 3.5m ~ 8m, be high seam, then direct using described stope drift active workings as cut top tunnel;
Step 2: arrange blast hole
If coal seam is super high seam, cut top tunnel above roof strata in be vertically arranged with several tilt blast hole; If coal seam is high seam, in the coal seam of cutting above tunnel, top and roof strata, be vertically arranged with several blast holes tilted; Described blast hole is arranged in the roof strata helped near the stope drift active workings tunnel adjacent with coal column;
Blast hole and roof angle are 30 ° ~ 80 °, and be 3 ~ 5 times of coal seam thickness to the vertical range of cutting top back at the bottom of blast hole hole, blast hole diameter is 60mm ~ 90mm;
Step 3: powder charge sealing of hole and cut top explosion
Powder charge in blast hole also by stemming sealing of hole, is implemented to cut top explosion; Loaded length is 0.6 ~ 0.75 times of blast hole hole depth, and stemming filling length is 0.25 ~ 0.4 times of blast hole hole depth.
2. tight roof Deephole pre-splitting blasting according to claim 1 cuts top pressure relief method, it is characterized in that described blast hole is arranged in same plane.
3. tight roof Deephole pre-splitting blasting according to claim 1 cuts top pressure relief method, it is characterized in that the distance between described adjacent blast hole is 3m ~ 5m.
4. tight roof Deephole pre-splitting blasting according to claim 1 cuts top pressure relief method, it is characterized in that the centre position between described adjacent blast hole is provided with control hole in parallel, and the diameter of control hole is 80mm ~ 100mm; Control hole hole depth is all identical with blast hole hole depth, and after setting up control hole, the distance between described adjacent blast hole is 8m ~ 10m.
CN201310216309.XA 2013-05-31 2013-05-31 Roof-cutting pressure relief method in hard-roof deep-hole pre-splitting blasting CN103278055B (en)

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CN103557006B (en) * 2013-11-21 2015-10-28 兖矿集团有限公司 Tunnel reasonable Arrangement method under large area tight roof
CN103615286B (en) * 2013-12-06 2017-07-18 中国矿业大学(北京) Working face open-off cut top pressure relief method
CN103940568B (en) * 2014-04-11 2016-08-17 中国矿业大学 A kind of method detecting tight roof relieving shot effect
CN104100266B (en) * 2014-08-04 2016-08-24 山东科技大学 The method of preventing and treating gob side entry bump
CN104462659B (en) * 2014-11-13 2018-07-31 辽宁工程技术大学 A kind of hard overlying strata grandidierite pressure shows analysis method
CN104481537A (en) * 2014-11-18 2015-04-01 山西潞安环保能源开发股份有限公司 Gas phase fracturing roof weakening treatment and safety caving method
CN104790954A (en) * 2015-03-27 2015-07-22 黑龙江科技大学 Roadside packing gob-side entry retaining top-cutting explosion pressure relief method
CN105569659B (en) * 2015-12-25 2018-10-16 中国矿业大学 A kind of tunnel hydraulic slotted liner technique directional blasting cuts top pressure relief method
CN105606002B (en) * 2016-01-12 2017-03-15 中国矿业大学 Reduce the disrumpent feelings layering presplit blasting method for causing calamity risk of colliery hard-and-thick strata
CN106643355B (en) * 2017-01-19 2019-07-09 中国矿业大学(北京) A kind of overhead caving method of the huge thick tight roof of deep coalmine
CN106884660A (en) * 2017-04-28 2017-06-23 中国矿业大学 A kind of method that protection pillar base angle presplit blasting release controls roadway deformation
CN107313777A (en) * 2017-05-09 2017-11-03 天地科技股份有限公司 The main return channel hydraulic fracturing pressure relief method of fully-mechanized mining working and device
CN107152279A (en) * 2017-06-06 2017-09-12 天地科技股份有限公司 Wangeviry stope top plate hydraulic fracturing method for weakening and device
CN107387085B (en) * 2017-09-26 2019-03-22 河南理工大学 A kind of tight roof and the porous control explosion softening method in coal seam
CN108548460B (en) * 2018-05-21 2020-01-07 北京科技大学 Method for preventing rock burst by coupling and pressure relief of blast hole and large-diameter drill hole
CN109162712B (en) * 2018-08-30 2020-06-05 北京矿冶科技集团有限公司 Method for controlling uneven settlement of overlying surrounding rock in caving goaf
CN109209495B (en) * 2018-09-13 2020-08-04 天地科技股份有限公司 Roof cutting and pressure relief protection method on stoping surface of fully mechanized coal mining face
CN109630171A (en) * 2018-11-01 2019-04-16 山西潞安环保能源开发股份有限公司常村煤矿 A method of along top tunnel along backplane relieving roadway floor lift control

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CN102778182B (en) * 2012-07-26 2014-03-26 山东科技大学 Beside-roadway topping pressure relief method of roadway driving along gob of small coal pillar influenced by dynamic pressure

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