CN104481537A - Gas phase fracturing roof weakening treatment and safety caving method - Google Patents
Gas phase fracturing roof weakening treatment and safety caving method Download PDFInfo
- Publication number
- CN104481537A CN104481537A CN201410663423.1A CN201410663423A CN104481537A CN 104481537 A CN104481537 A CN 104481537A CN 201410663423 A CN201410663423 A CN 201410663423A CN 104481537 A CN104481537 A CN 104481537A
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- hole
- gas phase
- splitting
- coal
- drilling
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000003313 weakening effect Effects 0.000 title claims abstract description 6
- 239000003245 coal Substances 0.000 claims abstract description 11
- 238000005422 blasting Methods 0.000 claims abstract description 10
- 238000005553 drilling Methods 0.000 claims abstract description 10
- 238000010276 construction Methods 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 claims abstract description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 238000004880 explosion Methods 0.000 claims description 3
- 239000002360 explosive Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a novel gas phase fracturing roof weakening treatment and safety caving method which comprises the following steps: (a) obliquely upwards drilling a pre-splitting hole in a coal seam roof by virtue of the design angle and different drilling hole distances by using a ZLJ-350 special underground drill rig for coal mine from the open-off cut of the coal face and an air return and inlet down channel which is 20-30m away from the open-off cut, wherein the diameter of the drill hole is 75mm; (b) pushing a fracturing rod, wherein after the drilling construction is finished, the drilling and pore-forming effect is observed, namely whether the conditions that the hole collapses and the hole is blocked by coal and gangue is observed, and if the hole collapse and hoe blockage conditions occur, workers are timely organized to clean; then, in order to accelerate the construction progress, on the basis that the mass and friction resistance of the fracturing rod are calculated, each drill hole needs to be pushed by 4-6 workers and a technician by utilizing manual push, and the number of the persons pushing the fracturing rod in the hole is properly adjusted according to the depth of the drill hole; and (c) connecting and blasting, namely connecting a blasting line from the interior of the hole to the safe distance outside the pre-splitting hole and performing pre-splitting blasting.
Description
Technical field
The present invention relates to the method for the safe caving of a kind of gas phase pressure break roof weakening process.
Background technology
In the recovery process of stope working surface of coal mines, the safety management of especially always pushing up breaking down for the first time in first stage of adopting is that fully-mechanized mining working realizes safety, efficiently key link.Once run into the tight roof of good integrity, not easily inbreak, easily cause goaf area of suspension roof constantly to expand, when the outstanding dew top board of larger area is caving instantaneously, very easily cause gas exceeding limit, mining machinery damages, and casualties, leads to great roof accident.Roof accident is one of the important disaster accident that can not be ignored of colliery, it is different from gas and dust explosion, the particularly serious serious accident of group dead group wound is usually more rare, and scattered accident frequently occurs, the place that every people of having works, this kind of accident all likely occurs, and distribution is also extensive especially.Adopt top board Pre-splitting Blasting Technique, weaken top board in advance, can ensure that back production initial stage roof safety is caving and keeps the safety in production.
The domestic and international technical measures to the presplitting of hard coal seam top board has at present:
1. water filling weakens tight roof 1. top board high pressure water injection.Shortcoming: work site environments is severe, 2. top board static pressure water filling.Shortcoming: long action time, effect site environment is severe, only relatively good to the sandstone effect of clay bonding, is not very desirable to other top board effects.
2. explosive presplit blasting weakens tight roof.1. circulating shallow bore hole caving.Advantage: be applicable to various tight roof, shortcoming: complex procedures, impact is normally produced, and process miso-fire difficulty, explosive payload is difficult to determine, safety factor is low.2. pace type deep hole blasting, advantage: be applicable to various tight roof, shortcoming: complex procedures, impact is normally produced, and process miso-fire difficulty, explosive payload is difficult to determine, safety factor is low.3. advanced deep hole presplit blasting.Advantage: be applicable to various tight roof, shortcoming: complex procedures, process miso-fire difficulty, explosive payload is difficult to determine, safety factor is low.4. ground Method With Longhole Roof Caving.Advantage: be applicable to various tight roof, shortcoming: cost is high, complex procedures, process miso-fire difficulty, explosive payload is difficult to determine, safety factor is low.
Summary of the invention
Object of the present invention provides a kind of method of new top board presplitting just for the weak point existed in above-mentioned technology.The method can economical, efficiently the breaking down for the first time step pitch that effective Weakening treatment effectively reduces immediate roof is carried out to hard difficult caving plate, increase coal recovery rate, guarantees working surface production safety.
Object of the present invention can be realized by following technique measures:
Method of the present invention comprises subordinate's step:
A, suppress and split boring: adopt the special underground drill rig in ZLJ-350 colliery to beat pre-splitting hole with design angle and the different spacing of wells to roof obliquely from coal-face open-off cut and apart from the belt crossheading of open-off cut 20m ~ 30m, track crossheading, bore diameter is 75mm; Design angle is 35 degree to 50 degree, and the spacing of wells is 0.8m to 2.2m;
The propelling movement of b, pressure break bar: after pre-splitting hole construction, first will observe Completion of Drilling Hole effect, with or without collapse hole, bastard coal plug-hole situation, should organize workman to clear up if any collapse hole, plug-hole situation in time; Afterwards, be accelerating construction progress, on the basis of the quality and frictional resistance by calculating gas phase fracturing device, utilizing and manually advancing, the propelling movement of each boring needs 4 ~ 6 workmans and a technician; The quantity pushing gas phase pressure break bar in boring suitably should adjust according to drilling depth;
C, line explosion: the safe distance that detonating fuse is connected to outside pre-splitting hole from the gas phase fracturing device in boring is carried out presplit blasting; Gas phase fracturing device is built with liquid gas, and liquid gas is carbon dioxide.
Beneficial effect of the present invention is as follows:
1, the breaking down for the first time step pitch of immediate roof is effectively reduced.
2, coal recovery rate is increased.
3, by reducing top board breaking down for the first time step pitch, cutting eye and always pushing up integrality, first weight is directly become periodic weighting, stop the shock wave accident that roof falling over great extent causes.
When 4, avoiding old man's sky top to be caving, air is extruded suddenly, causes wind speed to accelerate suddenly, distinguished and admirable instantaneous disorder, stops the coal dust accident caused thus.
Accompanying drawing illustrates:
Fig. 1 is open-off cut top board pre-splitting hole plane of arrangement figure;
Fig. 2 is that open-off cut top board pre-splitting hole arranges sectional drawing;
Fig. 3 is the I-I sectional drawing in Fig. 1;
Fig. 4 is the II-II sectional drawing in Fig. 1;
In figure: 1, pre-splitting hole.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described.
As Figure 1-4, adopt the special underground drill rig in ZLJ-350 colliery to beat pre-splitting hole 1 with design angle and the different spacing of wells to roof obliquely from coal-face open-off cut and apart from the belt crossheading of open-off cut 20m ~ 30m, track crossheading, bore diameter is 75mm; Design angle is 35 degree to 50 degree, and the spacing of wells is 0.8m to 2.2m;
After pre-splitting hole construction, first will observe Completion of Drilling Hole effect, with or without collapse hole, bastard coal plug-hole situation, should organize workman to clear up if any collapse hole, plug-hole situation in time; Afterwards, be accelerating construction progress, on the basis of the quality and frictional resistance by calculating gas phase fracturing device, utilizing and manually advancing, the propelling movement of each boring needs 4 ~ 6 workmans and a technician; The quantity pushing gas phase pressure break bar in boring suitably should adjust according to drilling depth;
The safe distance that detonating fuse is connected to outside pre-splitting hole from the gas phase fracturing device in boring is carried out presplit blasting; Gas phase fracturing device is built with liquid gas, and liquid gas is carbon dioxide.
Claims (1)
1. a method for the safe caving of gas phase pressure break roof weakening process, described method comprises following concrete steps:
A, suppress and split boring: adopt the special underground drill rig in ZLJ-350 colliery to beat pre-splitting hole with design angle and the different spacing of wells to roof obliquely from coal-face open-off cut and apart from the belt crossheading of open-off cut 20m ~ 30m, track crossheading, bore diameter is 75mm; Described design angle is 35 degree to 50 degree, and the described spacing of wells is 0.8m to 2.2m;
The propelling movement of b, pressure break bar: after pre-splitting hole construction, first will observe Completion of Drilling Hole effect, with or without collapse hole, bastard coal plug-hole situation, should organize workman to clear up if any collapse hole, plug-hole situation in time; Afterwards, be accelerating construction progress, on the basis of the quality and frictional resistance by calculating gas phase fracturing device, utilizing and manually advancing, the propelling movement of each boring needs 4 ~ 6 workmans and a technician; The quantity pushing gas phase pressure break bar in boring suitably should adjust according to drilling depth;
C, line explosion: the safe distance that detonating fuse is connected to outside pre-splitting hole from the gas phase fracturing device in boring is carried out presplit blasting; Described gas phase fracturing device is built with liquid gas, and described liquid gas is carbon dioxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410663423.1A CN104481537A (en) | 2014-11-18 | 2014-11-18 | Gas phase fracturing roof weakening treatment and safety caving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410663423.1A CN104481537A (en) | 2014-11-18 | 2014-11-18 | Gas phase fracturing roof weakening treatment and safety caving method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104481537A true CN104481537A (en) | 2015-04-01 |
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ID=52756129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410663423.1A Pending CN104481537A (en) | 2014-11-18 | 2014-11-18 | Gas phase fracturing roof weakening treatment and safety caving method |
Country Status (1)
| Country | Link |
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| CN (1) | CN104481537A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106247876A (en) * | 2016-10-13 | 2016-12-21 | 太原理工大学 | High working face cuts greatly a blasting method for fully-mechanized mining working tight roof overhead caving |
| CN108252651A (en) * | 2018-01-12 | 2018-07-06 | 新疆龟兹矿业有限公司 | The method of fully-mechanized mining working multi-point dispersion run-in index borehole presplitting top plate |
| CN110985122A (en) * | 2019-12-17 | 2020-04-10 | 陕西煤业化工技术研究院有限责任公司 | High-pressure hydraulic presplitting open-off roadway drilling arrangement method |
| CN111022050A (en) * | 2019-12-16 | 2020-04-17 | 山东省邱集煤矿有限公司 | Fully-closed blasting pressure relief and self-retained roadway method for grouting reconstruction of composite roof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1559154A1 (en) * | 1988-03-01 | 1990-04-23 | Ленинградский горный институт им.Г.В.Плеханова | Method and apparatus for loosening solid roof |
| CN102942006A (en) * | 2012-11-29 | 2013-02-27 | 河南理工大学 | Method for sequestering carbon dioxide |
| CN103278055A (en) * | 2013-05-31 | 2013-09-04 | 辽宁工程技术大学 | Roof-cutting pressure relief method in hard-roof deep-hole pre-splitting blasting |
| CN103334790A (en) * | 2013-07-23 | 2013-10-02 | 辽宁工程技术大学 | High-pressure gas blasting-based coal seam roof advance presplitting method |
| CN104074499A (en) * | 2014-06-23 | 2014-10-01 | 山西潞安工程有限公司 | Fracturing rod connecting device |
-
2014
- 2014-11-18 CN CN201410663423.1A patent/CN104481537A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1559154A1 (en) * | 1988-03-01 | 1990-04-23 | Ленинградский горный институт им.Г.В.Плеханова | Method and apparatus for loosening solid roof |
| CN102942006A (en) * | 2012-11-29 | 2013-02-27 | 河南理工大学 | Method for sequestering carbon dioxide |
| CN103278055A (en) * | 2013-05-31 | 2013-09-04 | 辽宁工程技术大学 | Roof-cutting pressure relief method in hard-roof deep-hole pre-splitting blasting |
| CN103334790A (en) * | 2013-07-23 | 2013-10-02 | 辽宁工程技术大学 | High-pressure gas blasting-based coal seam roof advance presplitting method |
| CN104074499A (en) * | 2014-06-23 | 2014-10-01 | 山西潞安工程有限公司 | Fracturing rod connecting device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106247876A (en) * | 2016-10-13 | 2016-12-21 | 太原理工大学 | High working face cuts greatly a blasting method for fully-mechanized mining working tight roof overhead caving |
| CN108252651A (en) * | 2018-01-12 | 2018-07-06 | 新疆龟兹矿业有限公司 | The method of fully-mechanized mining working multi-point dispersion run-in index borehole presplitting top plate |
| CN108252651B (en) * | 2018-01-12 | 2020-01-10 | 新疆龟兹矿业有限公司 | Method for fully mechanized mining face multipoint dispersion parallel type blast hole presplitting roof |
| CN111022050A (en) * | 2019-12-16 | 2020-04-17 | 山东省邱集煤矿有限公司 | Fully-closed blasting pressure relief and self-retained roadway method for grouting reconstruction of composite roof |
| CN110985122A (en) * | 2019-12-17 | 2020-04-10 | 陕西煤业化工技术研究院有限责任公司 | High-pressure hydraulic presplitting open-off roadway drilling arrangement method |
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Application publication date: 20150401 |