CN112360460A - Method and system for conducting equal-thickness treatment on working face coal seam thickening zone and adjacent coal seam - Google Patents
Method and system for conducting equal-thickness treatment on working face coal seam thickening zone and adjacent coal seam Download PDFInfo
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- CN112360460A CN112360460A CN202011347387.XA CN202011347387A CN112360460A CN 112360460 A CN112360460 A CN 112360460A CN 202011347387 A CN202011347387 A CN 202011347387A CN 112360460 A CN112360460 A CN 112360460A
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- 239000003245 coal Substances 0.000 title claims abstract description 224
- 230000008719 thickening Effects 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 42
- 238000004080 punching Methods 0.000 claims abstract description 19
- 238000010276 construction Methods 0.000 claims abstract description 9
- 239000011435 rock Substances 0.000 claims description 19
- 238000005303 weighing Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 238000009826 distribution Methods 0.000 claims description 2
- 230000005641 tunneling Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 29
- 238000000605 extraction Methods 0.000 description 12
- 238000005086 pumping Methods 0.000 description 12
- 238000005065 mining Methods 0.000 description 9
- 230000002265 prevention Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
A method and a system for treating a coal seam thickening zone of a working face and an adjacent coal seam in an equal thickness mode are characterized in that a hydraulic drilling or hydraulic punching method is adopted, firstly, a hole is punched in the coal seam thickening zone, coal is unloaded, the volume of a coal body of the coal seam thickening zone after coal unloading is approximately equal to that of a coal body of a coal seam with a normal thickness, then a regional gas treatment method which is the same as that of the coal seam with the normal thickness can be adopted in the coal seam thickening zone, and the outburst danger of the coal seam thickening zone can be eliminated accurately. The method is suitable for coal and gas outburst or high-gas coal seams with coal and gas outburst risks, and is applied to the construction process of taking regional measures for preventing and controlling the coal and gas outburst before coal roadway tunneling in the process of preparing a working face.
Description
Technical Field
The invention belongs to the technical field of gas control, and particularly relates to a method and a system for treating a thickening zone of a coal seam of a working face and an adjacent coal seam in an equal thickness mode.
Background
The forty-fifth regulation of the regulations on coal and gas outburst prevention: the regional outburst prevention measures refer to outburst prevention measures which are taken to a large range of the outburst coal seam before the outburst coal seam is excavated. The regional outburst prevention measures comprise two types of mining protective layers and pre-pumping coal seam gas. The method for pre-pumping the coal seam gas comprises the following steps: the method comprises the steps of pre-pumping coal seam gas of a ground well, pre-pumping section coal seam gas of an underground cross-layer drilling hole or a cross-layer drilling hole, pre-pumping coal seam gas of a coal roadway strip through the cross-layer drilling hole, pre-pumping coal seam gas of a mining area through the cross-layer drilling hole or the cross-layer drilling hole, pre-pumping coal seam gas of a coal uncovering area through the cross-layer drilling hole (including vertical wells, inclined wells and the like), pre-pumping coal seam gas of the coal roadway strip through the cross-layer drilling hole and the like.
Provisions for preventing coal and gas outburst forty-ninth provisions: when taking outburst prevention measures in various modes of pre-pumping coal seam gas areas, the following requirements should be met:
the drilling of the outburst prevention measure of the coal seam gas area of the cross-layer drilling or bedding drilling pre-pumping section should control the whole mining block section in the section, the mining roadways on two sides and the coal seam in a certain range outside the mining roadways. The range of the drilling control outside the stoping roadway is required to be as follows: the outline of the upper wall of the inclined and steep coal seam roadway is at least 20m out, and the outline of the lower wall is at least 10 m; the rest are at least 15m outside the contour lines on the two sides of the roadway respectively. The drilling control ranges are distances along the layer surface, and the following are the same;
and (II) drilling holes for pre-pumping outburst prevention measures in coal seam gas areas of coal seams of the coal roadway through layer drilling holes, wherein the whole coal seam roadway and coal seams in a certain range on two sides of the whole coal seam roadway should be controlled. The range is the same as the requirement of the outer side of the stoping roadway in the first item (first item);
(III) drilling holes along or through the layer, and controlling the coal bed of the whole mining block section by pre-pumping the drilling holes of the outburst prevention measures in the coal bed gas area of the mining area;
and (IV) carrying out outburst prevention measures on the coal seam gas area of the coal uncovering area of the cross-layer drilling pre-drainage rock cross-cut (comprising vertical wells, inclined wells and the like) before the minimum normal distance 7m from the coal seam of the coal uncovering working face (the distance is properly increased in a structural damage zone). The minimum control range for drilling is: the minimum distance from the outer edge of a control range to the contour line of a roadway (including the contour line of a roadway at a predicted front coal uncovering section) is not less than 5m, and the minimum advance distance of a coal hole is kept to 15m when a drill hole cannot penetrate through the full thickness of the coal seam at one time.
Corresponding to actual production, to single, soft coal seam, do not have the working face of exploiting the protective layer condition, because the coal quality is soft, and top bottom plate and country rock stability are relatively poor, and the pore wall collapses very easily to take place during the drilling construction, causes the sticking of a drill, buries the drill, leads to the hole rate low to influenced the gas drainage effect, especially the coal seam becomes thick area gas pressure high, and gas content is big, and the bedding drilling can not discover the coal seam and becomes thick area, buries great hidden danger for colliery safety in production.
Disclosure of Invention
The invention aims to provide a method for processing a coal seam thickening zone of a working face and an adjacent coal seam in an equal thickness mode, which is used for processing the coal seam thickening zone and the adjacent coal seam in an equal thickness mode on the premise that the coal seam thickening zone exists on the working face in the underground coal mine production process, is a supplementary measure in a regional measure, can ensure the safe recovery of the coal seam thickening zone, and ensures the safety of underground workers. The method is suitable for coal seams with coal and gas outburst, outburst danger or high gas, and is particularly suitable for coal seams with single and soft coal seams and without mining protective layer conditions in the process of preparing the working face by adopting regional measures for preventing and treating the coal and gas outburst.
Another object of the present invention is to provide a system for treating a variable thickness zone of a coal seam on a working face with equal thickness to an adjacent coal seam, which is suitable for the method.
In order to achieve the purpose, the technical scheme of the invention is as follows: a method for processing the thickening zone of a working face coal seam and an adjacent coal seam in an equal thickness mode comprises the following steps:
and 6, flushing a large amount of soft coal bodies in the hydraulic cave making process, and calculating the volume of the flushed coal bodies to ensure that the volume of the coal bodies in the coal seam thickening zone after coal unloading is equal to that of the normal coal seam.
The method has the advantages that in the underground production process of the coal mine, according to related signs (hardness difference of the top and the bottom of a coal layer, softness of the coal layer, development of structural coal and large fault near a working face), three-dimensional earthquake or borehole exposure, the working face is judged to have a coal layer thickening zone, the thickness and the range of the coal layer thickening zone are accurately detected, so that coal is unloaded from the coal layer through hydraulic punching and cave forming, the volume of a coal body of the coal layer thickening zone after coal unloading is approximately equal to the volume of a coal body of a coal layer with normal thickness, the coal layer or the gas content of the coal layer in the area is close to that of a coal body with normal thickness, and finally, by adopting a regional gas extraction method which is the same as that of the adjacent coal body, after extraction reaches the standard, safe extraction can be realized.
A system for treating the thick coal seam on working surface and the adjacent coal seam in same thickness is composed of a tunnel in rock stratum, several weighing belt conveyers and vibrating sieves in said tunnel,
the tunnel sets up in coal seam thickening area below, be provided with a plurality of release mouths along the tunnel trend on the tunnel roof, the intercommunication has a plurality of water conservancy that become fan-shaped distribution in the release mouth to make the cave hole, cave hole one end is made to water conservancy extends into the coal seam, the shale shaker corresponds the release mouth setting, is located under the release mouth, be provided with funnel type on the shale shaker pan feeding end and go into the glassware, the discharge end is connected with the belt feeder of weighing.
Still include belt conveyer, set up one side in the tunnel, a plurality of belt feeder discharge ends of weighing are connected with belt conveyer.
And a coal slag groove is arranged at the lower part of the vibrating screen.
The processing system is simple in structure, is suitable for the equal-thickness processing method, can effectively calculate the coal unloading amount of the coal seam thickening zone, achieves equal-thickness processing of the coal seam, and can extract coal seam gas after processing, so that a safe production target is achieved.
Drawings
FIG. 1 is a schematic cross-sectional view of arrangement of hydraulic punching and cave-making drill holes of a coal seam thickening belt of a working face;
FIG. 2 is a schematic diagram of arrangement of hydraulic punching and cave-making drill holes of a coal seam thickening belt of a working face;
FIG. 3 is a schematic diagram of hydraulic punching, cave-making and drilling construction of a working face;
FIG. 4 is a schematic diagram of the present application in a constant thickness processing system;
in the figure: 1-coal bed; 2-a rock formation; 3-a coal seam thickening zone; 4-floor rock roadway; 5-a drilling machine; 6-drilling through layers; 7-vibrating screen; 8-weighing belt conveyor; 9-belt conveyor.
Detailed Description
The invention will be further described with reference to the following examples in the accompanying drawings:
as shown in figure 4, the working face coal seam thickening belt and adjacent coal seam equal-thickness processing system comprises a bottom plate rock roadway 4 arranged in a rock stratum, a plurality of weighing belt conveyors 8, a vibrating screen 7 and a belt conveyor 9, wherein the weighing belt conveyors are arranged in the rock roadway
The bottom plate rock roadway 4 is arranged below the coal seam thickening belt 3, a plurality of pressure relief ports 41 are arranged on the top plate of the bottom plate rock roadway 4 along the roadway direction, a plurality of hydraulic hole-making holes formed by hydraulic hole-making through a through-layer drilling 6 are communicated in the pressure relief ports 41 and distributed in a fan shape, one end of each hydraulic hole-making hole extends into the coal seam, the vibrating screen 7 is arranged corresponding to the pressure relief ports 41 and is positioned right below the pressure relief ports 41, a funnel-shaped material feeder 71 is arranged on the feeding end of the vibrating screen, the discharging end is connected with the weighing belt conveyor 8, and a coal slag groove 72 is arranged at the lower part of the vibrating screen 7 and is used for collecting coal slag water; and the belt conveyor 9 is arranged on one side in the roadway, and the discharge ends of the weighing belt conveyors are connected with the belt conveyor.
As shown in figure 1, according to the method for treating the coal seam thickening zone of the working face and the adjacent coal seam in the same thickness manner, coal is discharged from the coal seam through hydraulic punching and cave building, so that the volume of the coal body of the coal seam thickening zone after coal discharge is approximately equal to the volume (quality) of the coal body of a normal coal seam, treatment is carried out through hydraulic punching and cave building, regional gas extraction measures can be carried out after the effect test reaches the standard, and therefore the corresponding gas treatment effect is achieved. The method comprises the following specific steps:
and 6, flushing a large amount of soft coal bodies in the hydraulic cave making process, and calculating the volume of the flushed coal bodies through the system of the invention to ensure that the volume (mass) of the coal bodies in the coal seam thickening zone after coal unloading is approximately equal to that of the coal bodies in a normal coal seam.
After the coal seam thickening zone equal-thickness treatment construction is completed, a regional gas extraction method which is the same as that of an adjacent normal coal seam is needed, after a construction extraction drill hole is formed, the drill hole is subjected to concentrated hole sealing, a gas extraction system is connected to the network after the drill hole is sealed, effect inspection is carried out on the extraction region after extraction is carried out for a period of time, parameters including residual gas pressure, gas content and the like are measured, and working face extraction operation can be carried out after the regional measure effect inspection is qualified (extraction reaches the standard).
The characteristics of the coal seam local thickening area comprise: the coal quality is soft, the hardness difference of the top and bottom plates of the coal bed is large, the permeability of the coal bed is low, and the extraction is difficult; the coal bed gas pressure is large, the gas content is high, and the outburst potential is large. After the method is adopted, the thickness of the coal bed, the gas content and the gas pressure of the coal bed thickening zone are effectively reduced, so that the phenomenon that the thickened gas of the coal bed suddenly gushes out or accumulates to a mining space can be effectively prevented, and the coal and gas outburst accidents are prevented.
Claims (4)
1. A method for processing the thickening zone of a working face coal seam and an adjacent coal seam in an equal thickness mode comprises the following steps:
step 1, confirming that a working face has a coal seam thickening zone, and constructing a bottom plate rock roadway under the coal seam; constructing a through-layer detection drill hole in a roof coal seam by using a drilling machine every 1.5m in a rock roadway of a floor, wherein the depth of the drill hole at least penetrates through the floor of the coal seam by 0.5m, and the thickness h and the range d of a coal seam thickening zone are detected;
step 2, calculating and determining the coal volume of the coal seam thickening zone according to the range of the coal seam thickening zone detected in the step 1, wherein the length of a top plate of the coal seam thickening zone is L1The length of the bottom plate is L2The thickness is h, the width is d, the volume of the coal seam thickening zone is
(ii) a Normal coal seam length in adjacent zones
Has a volume V of the coal seamo ；
Step 3, drilling holes upwards in a coal seam construction through a bottom plate rock roadway, and carrying out grid type cross-layer drilling hole arrangement, wherein included angles between the drilled holes are the same, n drilling fields are constructed along the coal seam inclination and trend each time, and the cross-layer drilling holes in each drilling field are arranged in a fan shape and penetrate through the coal seam roof for 0.5 m;
step 4, after the drilling in the step 3 is completed, hydraulic punching and cave-making equipment is adopted, firstly, high-pressure water jet with the pressure not less than 25MPa is adopted at the position close to the top plate of the target coal seam for primary hydraulic punching and cave-making, then, hydraulic punching and cave-making are carried out once at the interval of 0.5m when the coal seam is retreated until the bottom of the coal seam, and finally a pressure relief cave is formed, so that a cycle is formed;
step 5, repeating the steps 1-4 until all coal seams of the coal seam thickening zone are subjected to hydraulic punching and cave forming;
and 6, flushing a large amount of soft coal bodies in the hydraulic cave making process, and calculating the volume of the flushed coal bodies to ensure that the volume of the coal bodies in the coal seam thickening zone after coal unloading is equal to that of the normal coal seam.
2. The utility model provides a working face coal seam variable thickness area and adjacent coal seam isopachous processing system which characterized in that: comprises a tunnel arranged in a rock stratum, a plurality of weighing belt conveyors and vibrating screens arranged in the tunnel,
the tunnel sets up in coal seam thickening area below, be provided with a plurality of release mouths along the tunnel trend on the tunnel roof, the intercommunication has a plurality of water conservancy that become fan-shaped distribution in the release mouth to make the cave hole, cave hole one end is made to water conservancy extends into the coal seam, the shale shaker corresponds the release mouth setting, is located under the release mouth, be provided with funnel type on the shale shaker pan feeding end and go into the glassware, the discharge end is connected with the belt feeder of weighing.
3. The working face coal seam thickening belt and adjacent coal seam equal thickness processing system of claim 1, wherein: still include belt conveyer, set up one side in the tunnel, a plurality of belt feeder discharge ends of weighing are connected with belt conveyer.
4. The working face coal seam thickening belt and adjacent coal seam equal thickness processing system of claim 1, wherein: and a coal slag groove is arranged at the lower part of the vibrating screen.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011347387.XA CN112360460A (en) | 2020-11-26 | 2020-11-26 | Method and system for conducting equal-thickness treatment on working face coal seam thickening zone and adjacent coal seam |
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| CN202011347387.XA CN112360460A (en) | 2020-11-26 | 2020-11-26 | Method and system for conducting equal-thickness treatment on working face coal seam thickening zone and adjacent coal seam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115717529A (en) * | 2022-11-23 | 2023-02-28 | 焦作煤业（集团）有限责任公司 | Method for evaluating construction effect of protective layer in coal seam |
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2020
- 2020-11-26 CN CN202011347387.XA patent/CN112360460A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115717529A (en) * | 2022-11-23 | 2023-02-28 | 焦作煤业（集团）有限责任公司 | Method for evaluating construction effect of protective layer in coal seam |
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