CN113863984A - Method for preventing air leakage in mining of extremely-close coal seam groups - Google Patents
Method for preventing air leakage in mining of extremely-close coal seam groups Download PDFInfo
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- CN113863984A CN113863984A CN202111274945.9A CN202111274945A CN113863984A CN 113863984 A CN113863984 A CN 113863984A CN 202111274945 A CN202111274945 A CN 202111274945A CN 113863984 A CN113863984 A CN 113863984A
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- 239000003245 coal Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000005065 mining Methods 0.000 title claims abstract description 28
- 239000004568 cement Substances 0.000 claims abstract description 27
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 13
- 239000002002 slurry Substances 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 241000353135 Psenopsis anomala Species 0.000 claims description 5
- 239000003566 sealing material Substances 0.000 claims description 5
- 239000011398 Portland cement Substances 0.000 claims description 4
- 239000011435 rock Substances 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims description 2
- 230000002265 prevention Effects 0.000 abstract description 7
- 239000010410 layer Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 208000035480 Ring chromosome 8 syndrome Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 235000020238 sunflower seed Nutrition 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
Abstract
The invention discloses an extremely close coal seam group mining air leakage prevention method, belonging to the field of coal mine fire prevention; the method for preventing air leakage in mining of the extremely close coal seam group comprises the following steps: the method comprises the following steps that S10, a roadway is supported by a U-shaped shed, full-section guniting is carried out on the roadway, S20 shallow hole grouting is carried out on the roadway to form a cement sealing ring to block air leakage, and S30 deep hole grouting filling is carried out on an air leakage key section of the roadway; the roadway cracks are reduced through primary plugging of full-section guniting, secondary plugging air leakage of a cement sealing ring is formed through shallow hole grouting, tertiary plugging is performed through deep hole grouting, and a critical area of air leakage is blocked. The air leakage of the stoping roadway under the extremely-close coal seam goaf can be effectively prevented and treated.
Description
Technical Field
The invention belongs to the field of coal mine fire prevention and control, and particularly relates to an extremely-close coal seam group mining air leakage prevention and control method.
Background
Along with the continuous development of present science and technology, in recent years, a plurality of mining areas are gradually mining close-range coal seams, because the occurrence condition is different, the coal seam layer interval of different coal fields has differences, when the coal seam interval is great, the influence of the mined upper coal seam on the lower coal seam is less, when the coal seam interval is close, the influence of the mined upper coal seam on the lower coal seam is great, a large number of cracks are easily formed between a lower roadway and an overlying goaf, the roadway leaks air to the closed goaf, a dangerous area of spontaneous combustion of residual coal is formed, and the coal mining safety is seriously threatened.
Patent CN201910531717.1 mentions a method for treating goaf slight shock leaking stoppage and collapse, which comprises the steps of setting a blasting point in a ground surface fracture zone, adding a plugging agent, injecting water under pressure after detonation, and foaming and plugging the plugging agent when the plugging agent meets water. Patent CN201710049272.4 mentions a goaf air leakage control method in the process of shallow-buried short-distance coal seam mining, which comprises technologies of surface air leakage crack plugging, underground air leakage channel detection and plugging and the like. The above patent mentions a method for preventing air leakage in a goaf of a shallow buried coal seam.
Patent CN202010658257.1 mentions a goaf air leakage prevention method for a thin coal seam N00 mining method, wherein a movable telescopic air barrier is arranged on one side of a working face of the goaf, and a spraying layer is formed on a retaining roadway side of the goaf, which is positioned on an air inlet roadway and an air return roadway. Patent CN201711194156.8 mentions a method for preventing air leakage by stages along a gob-side entry by cutting the top, wherein at the initial stage of the gob-side entry, air duct cloth is hung between a goaf metal net and lane side U-shaped steel; spraying a concrete spraying layer of 30mm on the surfaces of the U-shaped steel and the air duct cloth at the middle and later stages of the gob-side entry retaining; and after the goaf is completely stable, injecting a foaming plugging material into the goaf through grouting and drilling, and increasing the grouting and drilling density for the area with severe spray layer cracking or air leakage. The method refers to air leakage prevention and control of the roadway and the mining space of the same coal seam.
In the process of mining the extremely close coal seam, because the coal seam interval is small, a large number of cracks are easily formed between the roadway and the overlying goaf, air leakage is serious, and no targeted method exists at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method for preventing and treating air leakage in mining of a coal seam group in a very close distance, which can effectively reduce air leakage cracks of a roadway and an overlying goaf in the mining process of the very close coal seam, reduce the spontaneous combustion risk of coal and ensure the safe stoping of the coal seam.
The purpose of the invention can be realized by the following technical scheme:
a method for preventing air leakage in mining of extremely close coal seam groups comprises the following steps:
s10, supporting the roadway by using a U-shaped shed, and carrying out full-section guniting on the roadway;
s20, performing shallow hole grouting on the roadway to form a cement sealing ring to block air leakage;
s30, deep hole grouting filling is carried out on the key section of the air leakage of the roadway.
Further, in the step S10, for the local section of the U-shaped shed at the shed leg, the roadway super-excavated part needs to be filled, and then the super-excavated part is subjected to guniting; for the section with the detachable braces, the braces are detached firstly, and then the slurry spraying is carried out; to the brace section that can not unload, must carry out the full coverage to the brace during whitewashing, ensure that U type canopy brace department does not appear the cavity.
Further, the proportion (mass ratio) of the guniting material is as follows: cement: yellow sand: 1, melon seed piece: 2: 2, the water-cement ratio is 1: 0.4 to 0.5.
Further, the cement is PO 32.5-grade ordinary portland cement, the yellow sand is medium-coarse sand, and the particle size of the sunflower seed slices is 5-10 mm;
further, an accelerator is added into the slurry, and the adding amount of the accelerator is 5% of the weight of the cement. The accelerator must be mixed with the spraying agent and cannot be mixed into the material in advance.
Further, in the step S20, shallow hole grouting is performed on the roadway at every set distance of the construction set drill holes, and a cement seal ring is formed between the slurry casing of the roadway and the roof coal rock after the grouting liquid is solidified.
Further, the water cement ratio of the cement paste is 1: 0.7 to 1.0.
Further, in the step S30, a plurality of long drill holes are uniformly constructed in the air leakage key section along the machine air roadway gate way on the roof in the roadway, the long drill holes are communicated to the overlying goaf, and a grouting anchor rod is used for grouting.
Further, a high molecular plugging sealing material is poured into the overlying goaf through the long drill hole;
furthermore, the plugging sealing material needs to meet the requirements of flame retardance, static resistance, safety and environmental protection, and the diffusion radius in the goaf needs to be more than 20 m.
The invention has the beneficial effects that: the air leakage crack of the roadway and the overlying goaf in the process of mining the extremely close coal seam can be effectively reduced, the spontaneous combustion risk of coal is reduced, and the safe stoping of the coal seam is ensured; the method is simple to operate, high in practicability and reliability, can be popularized and used in the process of mining the coal bed in a very short distance, and has a wide application prospect.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic view of prevention and control of air leakage of a roadway under a very close coal seam goaf.
Roadway-1; rock stratum-2; overlying a gob-3; long drilling-4; a roadway air leakage key section-5; a blocking layer-6; mining-7 in a coal mining area; cement seal ring-8; a short borehole 9.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a method for preventing air leakage in mining of a very close coal seam group comprises the following specific steps:
s10: the roadway is supported by a U-shaped shed, and full-section guniting is carried out on the roadway;
arranging a roadway 1 in a coal mining area 7, supporting the roadway 1 by using U-shaped sheds, performing overexcavation on local sections at shed legs, shearing diamond-shaped nets between the U-shaped sheds, filling the overexcavation part of the roadway 1, and then performing guniting on the overexcavation part;
for the section with the detachable braces, the braces are detached firstly, and then the slurry spraying is carried out; for the sections of the non-detachable braces, the braces must be fully covered during guniting, so that no cavity is formed at the brace positions of the U-shaped sheds;
timely guniting along with the tunneling of the tunnel, and uniformly distributing grout on the full section of the tunnel; the method specifically comprises the following steps: the spraying delay head-on of the part below the U-shaped shed clamping cable on one side of the roadway track is not more than 20m, and the spraying delay head-on of other parts is not more than 9 m; if the front piece of the head-on top plate is leaked or gas is abnormal, the guniting work must follow the head-on; the stop time exceeds 48h, and the guniting work must follow the head-on;
when spraying the mortar, the bottom plate needs to be cut into a groove, and the distance between the spraying thickness and the inner edge of the U-shaped shed is more than or equal to 50 mm.
The guniting thickness is based on the standard of ensuring the air tightness of the upper and the roof to be perfect and preventing the slurry leakage phenomenon during later grouting; the proportion (mass ratio) of the guniting material is as follows: cement: yellow sand: 1, melon seed piece: 2: 2, the water-cement ratio is 1: 0.4 to 0.5; the mud is PO 32.5-grade ordinary portland cement, the yellow sand is medium-coarse sand, and the particle diameter of the melon seed slices is 5-10 mm; and adding an accelerator into the slurry, wherein the addition amount of the accelerator is 5% of the weight of the cement. The accelerator must be mixed with the spraying agent and cannot be mixed into the material in advance.
S20: carrying out shallow hole grouting on the roadway to form a cement sealing ring 8 for blocking air leakage;
three short drill holes 9 are uniformly distributed in the roadway 1 for shallow hole grouting, namely one short drill hole 9 in the center line of a top plate and one short drill hole 9 in each of two shoulder pits (below a U-shaped shed clamping cable); grouting by using a grouting anchor rod, and sealing the pipe orifice before grouting after the grouting anchor rod is constructed; the grouting equipment adopts a hydraulic grouting pump for coal mines, the grouting material adopts single-liquid cement slurry, the cement adopts PC 32.5-grade composite portland cement, and the water cement ratio is 1: 0.7 to 1.0; the injection of the fill slurry into the borehole continues until it is no longer possible.
S30: deep hole grouting filling is carried out on the roadway air leakage key section;
deep hole grouting filling measures are implemented in air leakage key areas such as a roadway fault zone, an interlayer missing zone, a stress superposition zone and an overlying goaf coal-left zone;
the air leakage key section is uniformly provided with a plurality of long drill holes 4 along the locomotive air roadway gate way in the roof of the roadway, and the long drill holes 4 must enter the overlying gob 3; and grouting by adopting a grouting anchor rod, wherein the length of the grouting anchor rod in the influence range of the drawing line is determined according to the interlayer spacing.
The high molecular plugging sealing material is poured into the overlying goaf 3 from the long drill hole 4, the foaming multiple of the material is more than 15 times, heat is not released, the initial viscosity is low, the diffusion radius is more than 20m in the goaf environment, the material is a non-combustible material, the material is antistatic, and the compressive strength is more than 0.1 MPa.
The working principle is as follows:
the roadway 1 is supported by a U-shaped shed, full-section guniting is carried out on the roadway 1, and a plugging layer 6 is formed after the grout is solidified; shallow hole grouting is carried out on the roadway through the short drill hole 9 to form a cement sealing ring 8 for blocking air leakage; and (3) constructing a long drilling hole 4 which penetrates through the rock stratum 2 and enters the overlying goaf 3, and performing deep hole grouting filling on the roadway air leakage key section 5.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (8)
1. A method for preventing air leakage in mining of a coal seam group in a very close distance is characterized by comprising the following steps:
s10, supporting the roadway by using a U-shaped shed, and carrying out full-section guniting on the roadway;
s20, performing shallow hole grouting on the roadway to form a cement sealing ring to block air leakage;
s30, deep hole grouting filling is carried out on the key section of the air leakage of the roadway.
2. The method for preventing air leakage in mining of coal seam groups in a very close distance according to claim 1, wherein in the step S10, the roadway overexcavation position is filled in the partial section of the overexcavation at the shed legs of the U-shaped shed, and then the overexcavation position is sprayed with slurry; for the section with the detachable braces, the braces are detached firstly, and then the slurry spraying is carried out; to the brace section that can not unload, must carry out the full coverage to the brace during whitewashing, ensure that U type canopy brace department does not appear the cavity.
3. The method for preventing and treating air leakage in mining of the coal seam group in the very close range according to claim 2, wherein the proportion (mass ratio) of the guniting material is as follows: cement: yellow sand: 1, melon seed piece: 2: 2, the water-cement ratio is 1: 0.4 to 0.5.
4. The method for preventing and treating air leakage in mining of the coal seam group in the very close range according to claim 3, wherein the cement is PO 32.5-grade ordinary portland cement, the yellow sand is medium-coarse sand, and the grain diameter of the melon seed pieces is 5-10 mm;
and adding an accelerator into the slurry, wherein the addition amount of the accelerator is 5% of the weight of the cement. The accelerator must be mixed with the spraying agent and cannot be mixed into the material in advance.
5. The method for preventing air leakage in mining of a coal seam group in a very close distance according to claim 1, wherein in the step S20, shallow hole grouting is performed on the roadway at every set distance construction set drill hole, and after the grouting liquid is solidified, a cement seal ring is formed between a slurry shell of the roadway and the roof coal rock.
6. The method for preventing and treating air leakage in mining of coal seam groups in a very close distance according to claim 5, wherein the water-cement ratio of cement paste is 1: 0.7 to 1.0.
7. The method for preventing and treating the air leakage in the mining of the coal seam group in the very close range according to claim 1, wherein in the step S30, a plurality of long drill holes are uniformly constructed in the air leakage key section along the roadway gate way in the roof, the long drill holes are communicated to the overlying goaf, and grouting is carried out by adopting a grouting anchor rod.
8. The method for preventing and treating the air leakage in the mining of the coal seam groups in the very close distance according to claim 7, characterized in that a high molecular plugging sealing material is poured into the overlying goaf through the long drill hole;
the plugging sealing material needs to meet the requirements of flame retardance, static resistance, safety and environmental protection, and the diffusion radius in a goaf needs to be more than 20 m.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117418863A (en) * | 2023-11-22 | 2024-01-19 | 中国矿业大学(北京) | Roadway crack partition identification and guniting plugging method and device |
| CN117418863B (en) * | 2023-11-22 | 2024-05-14 | 中国矿业大学(北京) | Roadway crack partition identification and guniting plugging method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117418863A (en) * | 2023-11-22 | 2024-01-19 | 中国矿业大学(北京) | Roadway crack partition identification and guniting plugging method and device |
| CN117418863B (en) * | 2023-11-22 | 2024-05-14 | 中国矿业大学(北京) | Roadway crack partition identification and guniting plugging method and device |
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