CN110454211B - Shallow oxygen-control suffocation treatment method for coal field fire region with mine fire and surface fire coexisting - Google Patents
Shallow oxygen-control suffocation treatment method for coal field fire region with mine fire and surface fire coexisting Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 41
- 206010003497 Asphyxia Diseases 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000001816 cooling Methods 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims abstract description 34
- 239000002002 slurry Substances 0.000 claims abstract description 32
- 238000005553 drilling Methods 0.000 claims abstract description 23
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 11
- 239000001301 oxygen Substances 0.000 claims abstract description 11
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims description 26
- 239000007924 injection Substances 0.000 claims description 26
- 239000006260 foam Substances 0.000 claims description 22
- 241000251468 Actinopterygii Species 0.000 claims description 12
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- 230000000903 blocking effect Effects 0.000 claims description 10
- 230000035699 permeability Effects 0.000 claims description 9
- 239000004575 stone Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 14
- 239000011435 rock Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 206010021143 Hypoxia Diseases 0.000 description 1
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- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
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- E—FIXED CONSTRUCTIONS
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- E21F15/00—Methods or devices for placing filling-up materials in underground workings
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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
- E21F3/00—Cooling or drying of air
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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
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
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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
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
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Abstract
The invention discloses a shallow oxygen control asphyxiation treatment method for a coal field fire area with mine fire and surface fire coexisting, belongs to the technical field of coal field fire area treatment, and solves the problems of long construction period and difficult high-efficiency treatment caused by large stripping engineering quantity, large drilling construction quantity and large water slurry filling quantity in the prior art. The method comprises the following steps: s1, locally stripping the earth surface of a fire area to form a stepped working platform; s2, filling materials are injected into the shallow treatment drill holes to fill the cavity area; s3, cooling a shallow high-temperature area of the fire area on the platform; s4, when the integral temperature of the shallow part is reduced to 100 ℃, carrying out layered plugging on the cooling area of the shallow part, and monitoring a fire area; s5, if temperature rebounding occurs, the rebounding area and the boundary of the rebounding area are plugged again; s6, if the temperature rebound phenomenon occurs again, repeating the step S5; after no rebound phenomenon, the treatment is finished. The method is suitable for treating the coal field fire area where mine fire and surface fire coexist.
Description
Technical Field
The invention belongs to the technical field of coal field fire area treatment, and particularly relates to a shallow oxygen-control suffocation treatment method for a coal field fire area with mine fire and surface fire coexisting.
Background
Coal field fire disaster is a disaster of large-area combustion of coal seams, large-area vegetation is killed while a large amount of coal resources are burnt and greenhouse gas is discharged, and toxic substances (such As As, F, Se, Hg and the like) generated by coal fire combustion pollute underground water resources.
At present, the coal field fire areas mainly existing in China mainly take the coal field fire areas which coexist in the upper and lower wells as the main points. The fire-like area is mainly caused by coal combustion in a mine underground goaf, high-temperature smoke generated by coal combustion is diffused to the ground surface through the communicating channel, outcrop coal with high superficial surface weathering degree is ignited, and an underground-ground surface through type coexisting fire area is formed.
As shown in fig. 2, the conventional coal field fire area treatment method is a fire extinguishing method for directly pouring water slurry into a fire area, and includes the steps of firstly, integrally stripping a mountain to form a large-area operation platform, then constructing a fire extinguishing drill hole with a shallow part and a deep part combined on the operation platform, and grouting a shallow high-temperature area and an underground deep high-temperature area of a coexistent coal field fire area until the whole treatment area is filled, as shown in fig. 2. The method is used for treating the mine fire and surface fire coexisting fire area, the stripping work amount is large (sometimes the mountain is required to be integrally blasted), the drilling construction amount is large (fire extinguishing drilling needs to be carried out on deep and shallow high-temperature areas), the water slurry filling amount is large (the fire area is large in communication space and is completely filled), and the construction period is long, and the high-efficiency treatment is difficult.
Disclosure of Invention
In view of the above analysis, the invention aims to provide a shallow oxygen-control asphyxiation treatment method for a coal field fire area with mine fire and surface fire coexisting, which is used for solving the problems of long construction period and difficult high-efficiency treatment caused by large stripping engineering amount, large drilling construction amount and large water slurry filling amount in the prior art.
The purpose of the invention is mainly realized by the following technical scheme:
a shallow oxygen-control suffocation treatment method for a coal field fire area with mine fire and surface fire, which comprises the following steps:
s1, locally stripping the earth surface of a fire area to form a stepped working platform;
s2, constructing a shallow treatment drill hole on the working platform, and injecting a filling material to fill the cavity area through the shallow treatment drill hole;
s3, cooling a shallow high-temperature area of the fire area on the platform to form a shallow cooling area;
s4, when the integral temperature of the shallow part is reduced to 100 ℃, carrying out layered plugging on the cooling area of the shallow part, firstly pressing and injecting viscous slurry, then pressing and injecting plugging materials, solidifying the plugging materials to form a plugging layer, and monitoring a fire area;
s5, if the temperature rebound phenomenon occurs, the rebound area and an area extending 15-20m from the boundary of the rebound area are blocked again, and then the fire area is monitored;
s6, if the temperature rebound phenomenon occurs again, repeating the step S5; after no rebound phenomenon, the treatment is finished.
Further, in step S2, the filler is non-combustible solid such as crushed stone, sand and soil near the fire zone, and the diameter of the filler is not more than two fifths of the diameter of the drilled hole at the maximum.
Further, in step S2, the volume ratio of the filler is water: soil: the diameter of the crushed stone is 2:1:3, and the maximum diameter of the crushed stone does not exceed two fifths of the diameter of the drilled hole.
Further, in step S3, water injection and foam injection are performed in the surface fish-scale pits to cool the shallow high-temperature area.
Further, fish scale pits are arranged on the working platform in a pentagonal hole arrangement mode.
Further, viscous slurry is injected under the shallow treatment drilling underground port, and plugging materials are injected in the part higher than the shallow treatment drilling underground port.
Further, in step S4, the viscous slurry is injected under pressure below the depth of 20m of the working platform, and the plugging material is injected in the part with the depth less than 20m from the ground.
Further, the permeability of the blocking layer in the step S4 is less than 10-10m2Stopping plugging;
the permeability of the blocking layer formed by blocking again in the step S5 is less than 10-10m2And stopping plugging.
Further, in the step S5, the temperature rebound phenomenon is that the temperature of the cooling zone exceeds 70 ℃ and continuously rises, or a large amount of water vapor evaporates on the surface of the ground or a baking trace appears.
Further, the distance between the shallow treatment boreholes in the step S2 is 6-8 m.
Furthermore, the shallow part of the fire zone is a region from the ground surface to the underground by 20-40 m.
Further, in step S4, an observation hole for monitoring a fire zone is provided on the stepped working platform.
Compared with the prior art, the invention can at least realize one of the following technical effects:
1) the invention isolates the oxygen supply channel of the deep mine fire by cooling and plugging the shallow high-temperature area of the fire area of the coexisting coal field, so that the deep mine fire is suffocated due to insufficient oxygen supply. Compared with the conventional coal field fire area treatment method, the construction treatment of the deep high-temperature area is not needed, and the drilling and the water slurry pouring are not needed, so that the construction amount of the drilling and the water slurry pouring are greatly reduced.
2) The method only needs to cool and plug the shallow high-temperature area, and only needs to locally strip the shallow part when the shallow high-temperature area is treated, so that the stepped working platform for cooling and plugging the shallow part is formed, the defect that the conventional treatment method needs to strip the ground surface in a large area to form a large-area working platform to meet the requirement of treating and drilling the shallow part and the deep part in combination is overcome, and the method has the advantage of less ground surface stripping amount compared with the conventional treatment method.
3) The high-temperature area of the shallow part is plugged by adopting layered plugging, the plugging material is injected by pressure at a depth of less than 20m, the plugging material has good fluidity, is rapidly solidified and has good compactness; viscous slurry is injected under pressure below 20m, the viscous slurry is not easy to run off, and can wrap high-temperature coal rocks to play a role in suffocation and cooling; the plugging effect can be realized by adopting the layered plugging at about 20m of the working platform.
4) According to the invention, the cavity area is filled firstly, then the loose area and the cavity area are uniformly pressed and injected with foam for cooling, the water mist is abandoned for cooling, the foam is not easy to run off after being injected by filling, the foam can play a better suffocation effect, and the water mist is difficult to touch the cavity area.
5) According to the invention, a technology of quickly cooling the shallow high-temperature coal rock is adopted on the stepped working platform by combining filling materials in the cavity area, water injection into the fish-scale pits on the ground surface and foam injection in the shallow loose high-temperature area and the cavity area, the water injection cooling of the fish-scale pits is mainly suitable for fire sources within 10m below the ground surface, the fire extinguishing by foam injection through drilling is suitable for the shallow and deep fire sources, the water injection into the fish-scale pits can be firstly constructed, and then foam injection and foam injection are carried out for cooling. The problem of low cooling efficiency of a single grouting water slurry technology is greatly improved, and the grouting water slurry amount in a conventional single grouting water slurry treatment shallow high-temperature area is reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a flow chart of the shallow oxygen-control asphyxia treatment method for a coal field fire zone with mine fire and surface fire coexisting according to the invention;
FIG. 2 is a schematic diagram of a conventional treatment method for a coal field fire area with coexisting mine fire and surface fire;
FIG. 3 is a schematic diagram of the shallow oxygen-controlling suffocation method for the coal field fire zone where the mine fire and the surface fire coexist.
Reference numerals:
1-a peeling zone; 2-shallow high temperature zone; 3-deep high temperature zone; 4-shallow treatment of drilling; 5-treating the drill hole in deep part; 6-coal bed; 7-a communication channel; 8-a plurality of small abandoned coal kilns penetrate through the high-temperature area in the goaf.
Detailed Description
The method for treating shallow oxygen-controlled asphyxiation in a coal field fire zone where mine fire and surface fire coexist is described in further detail below with reference to specific examples, which are provided for comparison and explanation purposes only, and the present invention is not limited to these examples.
The coal field fire area of the coal field fire area in which mine fire and surface fire coexist is shown in fig. 2 and 3 and comprises a shallow high-temperature area 2, a deep high-temperature area 3, a coal bed 6, a communication channel 7 and a high-temperature area 8 in a goaf through which a plurality of small waste coal kilns penetrate.
A method for treating shallow oxygen-control asphyxiation in a coal field fire area with mine fire and surface fire, as shown in figures 1 and 3, comprises the following steps:
s1, locally stripping the ground surface of the determined fire zone to form a stripping zone 1, and forming a step-type working platform in the stripping zone 1;
and (3) implementing a stripping leveling project in a roof rock layer above the burning coal layer, completely stripping the shallow outcrop coal layer, and removing a fire source to form a stepped working platform.
The defined fire zone refers to the fire zone which is defined in range and position before the coal fire is treated. The construction of notch cuttype work platform depends on specific topography condition, requires work platform's length to cover the fire district, and the width depends on this coal petrography loose degree, and the permeability is big or small promptly, also has the relation with the place topography. The platform is connected with the platform through a slope, the drill hole is placed on the platform, the distance between the drill hole and the drill hole is 6-8m, and the purpose is to ensure that the fire area is completely covered and blocked when the blocking material is injected by pressure, namely the continuity of a blocking layer.
After the pressure injection plugging is carried out, a compact plugging layer is formed on the inner side of the slope, and the plugging is complete, so that the air leakage can be avoided. The slope outside can use moist loess to cover in the inclined plane and carry out suitable compaction, reduces the porosity, reduces to leak out. It is worth noting that after the coal rock is stripped to form a working surface, the air leakage channel at the outcrop position of the coal bed is required to be tightly blocked.
In order to facilitate the stripping operation, water may be directly injected into the high-temperature ground surface to reduce the temperature before the stripping operation of step S1 is performed.
S2, constructing a shallow treatment drill hole 4 on the working platform, and injecting a filling material to fill the cavity area through the shallow treatment drill hole 4;
the solid filling material can be non-combustible solid such as broken stone, sand, soil and the like which are easily obtained near a fire area, and the diameter of the solid filling material is not more than two fifths of the diameter of the drilled hole to the maximum extent; the filling material can also be water in volume ratio: soil: the gravel ratio is 2:1:3, the maximum diameter of the gravel is not more than two fifths of the diameter of a drill hole, and water and soil are added to increase the fluidity of the gravel and reduce the damage of the gravel to the pipe wall. Directly conveying the mixture to a goaf through a drilling hole by a sand injection pump for filling.
S3, cooling a shallow high-temperature area of the fire area on the platform to form a shallow cooling area;
the shallow part of the fire zone is a region from the ground surface to the underground 20-40 m. Cooling a high-temperature area at the shallow part of a fire area by adopting a method combining water injection and foam pressure injection of surface fish-scale pits on a stepped working platform:
the fish scale pits are arranged on the working platform in a five-flower-eye arrangement mode according to the terrain, the fish scale pits are half-moon-shaped, 3m long and 1m deep, and the distance between the centers of the fish scale pits at the four corners and the center of the middle fish scale pit is 3.5 m. The surface of the earth can effectively cool a high-temperature area within 10m below the surface of the earth by adopting a fish scale hole water injection mode, and the water injection permeation radii of adjacent fish scale pits are connected by adopting a five-flower-hole arrangement mode, so that a water injection cooling permeation blind area can be avoided, and the cooling effect is greatly improved.
Therefore, the invention fills the cavity area, uniformly injects foam into the loose area and the cavity area for cooling, and abandons the fine water mist for cooling. The foam is used for cooling, the filling is to prevent the foam from losing when being injected, after the filling material is filled, the porosity is reduced, the foam cannot lose, the plugging effect can be achieved, and the foam can play a better suffocation effect. The shallow treatment drill hole 4 is a perforated pipe except for a solid pipe at the orifice part, so that foam, plugging materials and the like can be transversely filled. Foam concentrate generated by a foam generator is injected into the loosening area and the hollow area by a fire extinguishing medium injection device through the shallow treatment borehole 4.
The water injection cooling of the fish scale pits is mainly suitable for fire sources within 10m below the earth surface, the foam is injected through drilling to extinguish fire and suitable for shallow and deep fire sources, the water injection of the fish scale pits can be firstly constructed, and then the foam is injected through foam injection to cool.
The shallow loose high-temperature area refers to a shallow coal rock crushing area in a fire area, and the high-temperature area in the fire area of the coal field is mainly distributed in loose coal rock mass in the fire area.
The cavity area is a place without rock mass, a large number of burnt-out areas are formed in the fire area due to burning of the underground coal mass, the existing burnt-out areas break through the original stress balance state of the underground coal mass, surrounding rocks are promoted to deform, destroy and move, cracks of the overlying rock-soil layer continuously expand along with burning of the coal mass until the cracks collapse, and finally ground settlement is caused to form the cavity area.
The shallow treatment drill hole 4 is constructed on the working platform, the filling material is filled in the cavity area, the foam is injected into the coal rock loose area and the cavity area through the shallow treatment drill hole 4, the fish scale pit is dug on the ground surface of the stepped working platform, water is injected for cooling, the two methods are combined to realize the rapid cooling of the shallow high-temperature coal rock, the problem of low cooling efficiency of a single grouting water slurry technology is greatly improved, and the grouting water slurry amount in the conventional single grouting water slurry treatment shallow high-temperature area is reduced.
And S4, when the integral temperature of the shallow part is reduced to 100 ℃, changing the high-temperature area of the shallow part into a cooling area of the shallow part, and performing layered plugging on the cooling area of the shallow part through drilling to prevent oxygen from permeating from the ground surface. Viscous slurry is injected under the shallow treatment drilling underground port, and plugging materials are injected in the part higher than the shallow treatment drilling underground port. In the embodiment, the depth of the shallow treatment drill hole 4 is 20m, viscous slurry is injected under the depth of 20m of the working platform, plugging materials are injected under the depth of less than 20m, and a fire area is monitored;
when the shallow treatment drill hole 4 is constructed, the depth of the drill hole is determined, the depth is about 20m, the plugging material is injected by pressure in a region with the depth less than 20m by taking the depth as a boundary, the plugging material has good fluidity, is rapidly solidified and has good compactness, and specific materials are not required to be specified; viscous slurry with the water-soil ratio of 2:1 is injected under pressure in the following area, is not easy to lose, can wrap high-temperature coal rock, and plays roles of suffocation and cooling.
The permeability of the plugging layer is less than 10-10m2Stopping plugging, and detecting the permeability of the underground coal sample obtained by the drilling machine after the plugging material is injected by pressure to determine whether the permeability of the plugging layer reaches the standard or not;
the pressure injection plugging material has strong diffusivity and fluidity, a continuous compact plugging layer is formed in the shallow high-temperature area 2 of the fire area, and all gaps, hollow areas and the like in the shallow high-temperature area 2 are compacted to form a shallow plugging choking area.
And monitoring the fire area: monitoring the shallow high-temperature area 2, arranging observation drill holes on the working platform, putting temperature measuring wires (one end of each temperature measuring wire is a thermocouple, and the other end of each temperature measuring wire is connected with a temperature display instrument) into the observation drill holes by one worker, wherein the temperature measuring wires have a mark every 5m and are used for marking the depth of the temperature measuring wires stretching into the drill holes, and the other worker reads the temperature of the corresponding depth at the other end of each temperature measuring wire.
Preferably, the deep high-temperature region 3 is also monitored, and the monitoring is used for monitoring the treatment effect of the plugging treatment on the shallow high-temperature region 2 on the deep high-temperature region 3.
S5, if the temperature rebound phenomenon occurs, the rebound area and the area with the boundary extension length of 15-20m are blocked again, and the permeability of a blocking layer formed by secondary blocking is less than 10-10m2Stopping plugging, and monitoring a fire area;
and (4) injecting the plugging material to the periphery of the rebound area, which is close to the drill hole, by taking the rebound area as a center, so that the rebound area forms a compact plugging surrounding area again after the plugging material is injected into the drill hole.
The temperature rebound phenomenon is that the temperature of the cooling zone exceeds 70 ℃ and continuously rises, or a large amount of water vapor evaporates on the surface of the ground or a baking trace exists.
S6, if the temperature rebound phenomenon occurs again, repeating the step S5; after no rebound phenomenon, the treatment is finished.
The temperature of the shallow high-temperature area 2 is reduced to be lower than 100 ℃, and does not rise within 48 hours, and the treatment is finished.
The oxygen supply channel of the deep mine fire is isolated by cooling and plugging the shallow high-temperature area of the fire area of the coexisting coal field, so that the deep mine fire is suffocated due to insufficient oxygen supply. Compared with the conventional coal field fire area treatment method, the construction treatment of the deep high-temperature area is not needed, and the drilling and the water slurry pouring are not needed, so that the construction amount of the drilling and the water slurry pouring are greatly reduced.
The method only needs to cool and plug the shallow high-temperature area, and only needs to locally strip the shallow part when the shallow high-temperature area is treated, so that a ladder-type working platform for cooling and plugging the shallow part is formed, the defect that the conventional treatment method needs to strip the ground surface in a large area to form a large-area working platform to meet the requirement of treating and drilling the shallow part and the deep part in construction is overcome, and compared with the conventional treatment method, the method has the advantage of less ground surface stripping amount.
As shown in FIG. 3, in this example, in a coal field fire zone where mine fire and surface fire coexist, the inclination angle of the coal seam 6 is 70 degrees, the thickness of the coal seam 6 is 3m, the total scale of the fire zone is 160m × 50m × 150m, the scale of the high-temperature zone 2 in the shallow part of the mine is 40m × 50m × 35m, and the scale of the high-temperature zone 3 in the deep part of the mine is 70m × 40m × 60m, and after the method of the present invention is adopted, the stripping amount of the fire zone in the shallow part is about 35000m3The number of shallow treatment drill holes 4 is 42, the depth is 20m, the deep treatment drill holes 5 do not need to be constructed, water slurry does not need to be poured into the deep high-temperature area 3, fire extinguishing drill holes 840m are constructed in total, and the water slurry amount is 10000m3。
If the traditional treatment method is adopted, as shown in figure 2, large-area stripping needs to be carried out on the ground surface to form a large-area working platform so as to meet the requirements of constructing shallow treatment drill holes 4 and deep treatment drill holes 5, and the rock-soil stripping amount is 160000m3The number of shallow treatment drill holes 4 is 42, the number of deep treatment drill holes 5 is 60, the total construction fire extinguishing drill holes 6870m are used, and the water slurry amount is 60000m3。
By adopting a shallow part layer plugging method, the shallow part treatment drilling hole 4 can achieve the plugging effect at the depth of about 20m, and the volume ratio of the pressure water injection soil is 2 within the range of less than 20 m: 1 (the thick slurry is not easy to lose, can wrap up high-temperature coal rock, plays a role in suffocation and cooling), stops the pressure injection of the slurry when the slurry is not easy to be pressure injected downwards, injects plugging materials into a depth area smaller than 20m, and does not pay attention to the pressure injection of the slurry after the plugging is complete.
The invention provides a shallow oxygen-control asphyxiation treatment method for a fire zone where mine fire and surface fire coexist, which is characterized in that a shallow fire zone is blocked to isolate a channel for supplying oxygen to a deep part of a mine, so that the deep part of the mine is subjected to oxygen deficiency asphyxiation. The traditional treatment method mainly utilizes the cooling effect of water slurry to achieve the cooling effect. Through example verification, compared with the traditional treatment method, the shallow oxygen-control asphyxiation treatment method adopted by the invention has the advantages of less construction amount of fire-extinguishing drill holes, less water slurry amount for treatment and less surface stripping amount, and realizes the high-efficiency treatment of the coal field fire area with the coexistence of mine fire and surface fire.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (6)
1. A shallow oxygen-control suffocation treatment method for a coal field fire area with mine fire and surface fire, which is characterized by comprising the following steps:
s1, locally stripping the earth surface of a fire area to form a stepped working platform;
s2, constructing a shallow treatment drill hole on the working platform, and injecting a filling material to fill the cavity area through the shallow treatment drill hole;
s3, cooling a shallow high-temperature area of the fire area on the working platform to form a shallow cooling area;
s4, when the integral temperature of the shallow part is reduced to be within 100 ℃, carrying out layered plugging on the cooling area of the shallow part, firstly, pressing and injecting viscous slurry, then, pressing and injecting plugging materials, solidifying the plugging materials to form a plugging layer, and monitoring a fire area;
s5, if the temperature rebound phenomenon occurs, the rebound area and the boundary epitaxial area are blocked again, and then the fire area is monitored;
s6, if the temperature rebound phenomenon occurs again, repeating the step S5; after no rebound phenomenon exists, the treatment is finished;
the platform is connected with the platform through a slope, and the slope is covered with wet loess outside and compacted;
in the step S2, the filling material is the non-combustible solid of the broken stone, the sand and the soil near the fire zone, and the maximum diameter of the filling material is not more than two fifths of the diameter of the drill hole; or the filling material is water in volume ratio: soil: the diameter of the crushed stone is 2:1:3, and the maximum diameter of the crushed stone is not more than two fifths of the diameter of the drilled hole;
in the step S3, water injection and foam pressure injection are carried out on the fish scale pits on the ground surface to cool the shallow high-temperature area;
in the step S4, viscous mud is injected under the shallow treatment drilling underground port, and plugging materials are injected at the part higher than the shallow treatment drilling underground port;
in step S5, if the temperature bounce phenomenon occurs, the bounce region and the region 15-20m outside the boundary thereof are blocked again.
2. The method for shallow oxygen control asphyxia of a coal field fire zone where mine fire and surface fire coexist according to claim 1, wherein in step S3, fish scale pits are arranged on the working platform in a pentagonal hole arrangement manner.
3. The method for shallow oxygen control asphyxia of a coal field fire zone where mine fire and surface fire coexist according to claim 1, wherein in the step S4, the permeability of the blocking layer is less than 10-10m2Stopping plugging;
in the step S5, the permeability of the blocking layer formed by blocking again is less than 10-10m2And stopping plugging.
4. The method for shallow oxygen-control asphyxia of a coal field fire zone where mine fire and surface fire coexist according to claim 1, wherein in step S5, the temperature rebound phenomenon is that the temperature of the cooling zone exceeds 70 ℃ and continuously rises or that a large amount of water vapor evaporates from the surface or that there is a baking trace.
5. The method for shallow oxygen-control asphyxia of a coal field fire zone where mine fire and surface fire coexist according to claim 1, wherein the high-temperature surface is directly injected with water to reduce the temperature before the step S1.
6. The method for shallow oxygen control asphyxia of a coal field fire zone where mine fire and surface fire coexist according to any one of claims 1 to 5, wherein in step S3, observation boreholes for monitoring the fire zone are provided on the ladder type work platform.
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