CN110905507A - Advanced roof cutting pressure relief gob-side entry retaining process for high-gas large-mining-height high-efficiency mining working face - Google Patents
Advanced roof cutting pressure relief gob-side entry retaining process for high-gas large-mining-height high-efficiency mining working face Download PDFInfo
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- CN110905507A CN110905507A CN201911245085.9A CN201911245085A CN110905507A CN 110905507 A CN110905507 A CN 110905507A CN 201911245085 A CN201911245085 A CN 201911245085A CN 110905507 A CN110905507 A CN 110905507A
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- 238000005065 mining Methods 0.000 title claims abstract description 77
- 238000005520 cutting process Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000009423 ventilation Methods 0.000 claims abstract description 25
- 238000005422 blasting Methods 0.000 claims abstract description 9
- 230000005641 tunneling Effects 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000005192 partition Methods 0.000 abstract description 7
- 239000003245 coal Substances 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 7
- 238000011084 recovery Methods 0.000 description 6
- 239000011449 brick Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000010878 waste rock Substances 0.000 description 1
- 239000002023 wood Substances 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
- 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
- E21—EARTH OR ROCK 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
- E21F17/103—Dams, e.g. for ventilation
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Abstract
The invention provides a high-efficiency high-gas large-mining-height gob-side entry retaining process for roof cutting and pressure relief of a working face, wherein three roadways are respectively arranged on the large-mining-height working face; before stoping a large mining height working face, arranging top cutting drill holes close to the inner side of the flexible mold concrete filling wall in an auxiliary transportation roadway, and performing presplitting blasting on a top plate; during the stoping period of the large mining height working face, a temporary closing wall in front of the first mining working face is dismantled, meanwhile, a permanent closing wall is constructed behind the working face, a ventilation transverse channel is closed, and a goaf is isolated; after the large mining height working face is mined, the top plate automatically collapses and fills the collapsed goaf, the return airway and the flexible mold concrete filling wall are reserved, and the reserved return airway is used as a belt conveying airway for replacing the working face. The invention constructs the partition wall in advance, can meet the requirement of high gas and large mining height on the mining progress of the high-efficiency mining working face, can isolate the gas in the goaf, prevents the gas on the working face from exceeding the limit, and has stronger engineering popularization value.
Description
Technical Field
The invention belongs to the technical field of coal mining, and particularly relates to a high-gas large-mining-height high-efficiency mining working face advanced roof cutting pressure relief gob-side entry retaining process.
Background
The gob-side entry retaining can reduce the loss of the coal pillar on the working face and reduce the tunneling cost; y-shaped ventilation is adopted, and the gas control at the upper corner is facilitated; the working surfaces take over in sequence, island working surfaces do not exist, and rock burst or coal and gas outburst are not easy to induce. The method is widely applied to the coal mining technology, particularly the roof-cutting caving automatic roadway forming technology (namely 110 construction method) has the outstanding advantages of small gob-side entry retaining pressure, simple process, low cost and the like, and is comprehensively popularized and applied to low-gas medium-thickness coal seams in China at present. However, in China, a large number of high-gas thick coal seams exist simultaneously, such as mining areas in Shanxi, inner Mongolia, Henan and the like, especially in the western mining areas in China, the coal seam occurrence conditions are good, large-mining-height coal mining technologies are mostly adopted, a working face is propelled by several meters to more than ten meters every day, and the high-yield and high-efficiency coal mining areas belong to typical high-yield and high-efficiency working faces, and the traditional gob-side entry retaining technology adopted in the mining areas has the following difficulties:
(1) the gas emission amount of the coal seam is large, the goaf is difficult to block by adopting the roof cutting caving automatic lane forming (namely a 110 construction method) technology, the gas concentration of a return airway is high, and accident potential hazards such as gas overrun and even gas explosion exist;
(2) the working face has high propelling speed and high yield, and the roadside filling entry retaining technology behind the goaf has great influence on the positive production stoping of the working face, so that the ten-million-ton working face is difficult to implement;
therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to overcome the technical defect that the gob-side entry retaining mining method is difficult to implement in the mining area adopting the large-mining-height coal mining technology in the prior art, adopts the method of constructing the partition wall in advance and cutting the top in advance to perform pre-splitting, realizes gob-side entry retaining of the high-gas large-mining-height high-efficiency mining working face, and has stronger engineering application value.
In order to achieve the above purpose, the invention provides the following technical scheme:
a high-gas large-mining-height high-efficiency mining working face advanced roof cutting pressure relief gob-side entry retaining process comprises the following steps:
step S1, arranging a belt conveying lane on one side of the large mining height working face, arranging an auxiliary conveying lane and an air return lane on the other side of the large mining height working face, then constructing a flexible mold concrete filling wall on the side wall of the auxiliary conveying lane, arranging reserved channels at intervals in the length direction of the flexible mold concrete filling wall for ventilation, and then tunneling the air return lane along the flexible mold concrete filling wall;
step S2, after the three roadways in the step S1 are tunneled, cutting holes are tunneled on two sides of the working face of the large mining height, after the cutting holes are communicated, a temporary closing wall is built in the reserved channel and used for closing the reserved channel, and a ventilation system for air intake of the belt transportation roadway and the auxiliary transportation roadway and air return of the return airway is formed;
step S3, before stoping the working face with large mining height, arranging a top cutting drill hole at one side close to the flexible mold concrete filling wall in the auxiliary transportation lane, and performing presplitting blasting on the top plate;
step S4, after the large mining height working face is mined, the roof automatically collapses and fills the collapsed goaf, and the return airway and the flexible mold concrete filling wall are reserved, and the reserved return airway is used as a belt transportation airway for replacing the working face;
and step S5, during the stoping period of the large mining height working face, removing the temporary closing wall in front of the large mining height working face to be used as a ventilation channel, and simultaneously constructing a permanent closing wall behind the large mining height working face to close the ventilation transverse channel and isolate the goaf.
As described above, in the high-gas large-mining-height high-efficiency mining face advanced roof cutting pressure relief gob-side entry retaining process, further, the working faces corresponding to the three roadways in the step S1 are a first tunneling working face, a second tunneling working face and a third tunneling working face, the width of the second tunneling working face is L3, the width of the auxiliary transportation roadway is L1, the width of the flexible mold concrete filling wall is L2, and L3 is L1+ L2.
According to the advanced roof cutting pressure relief gob-side entry retaining process for the high-gas large-mining high-efficiency mining working face, L2 is 1.5-2 m.
According to the advanced roof cutting pressure relief gob-side entry retaining process for the high-gas large-mining-height high-efficiency mining working face, further, the spacing distance between every two adjacent reserved channels is 50-100 m.
In the advanced roof cutting pressure relief gob-side entry retaining process for the high-gas large-mining high-efficiency mining working face, in step S1, the flexible mold concrete filling wall is constructed after the second tunneling working face, the third tunneling working face only retracts the flexible mold concrete filling wall for tunneling, and the third tunneling working face is arranged next to the flexible mold concrete filling wall.
In the advanced roof cutting and pressure relief gob-side entry retaining process for the high-gas large-mining high-efficiency mining working face, the temporary closing wall in the step S2 is one of a wooden wall, a brick-built wall or a high-water material filling wall.
According to the advanced roof cutting pressure relief gob-side entry retaining process for the high-gas large-mining-height high-efficiency mining working face, further, the width of the reserved channel is 1-3 m.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
the invention aims at the working face under the special conditions of large mining height, high working face propulsion speed, large gas in a goaf and the like, a partition wall is constructed in advance, the partition wall can isolate the gas gushed out from a caving goaf, the gas of the working face is prevented from exceeding the limit, advanced roof cutting presplitting blasting is carried out simultaneously, a roof automatically collapses to fill the caving goaf, a return air tunnel can be reserved under the support of an anchor rod, an anchor rope and a flexible mold concrete filling wall, and the reserved flexible mold concrete continuous filling wall can play a role in preventing the waste rock in the goaf from sliding down to the working face, so that the gob-side entry retaining of the high-gas high-efficiency working face can be realized in the mining area with large coal seam gas emission amount and high working face propulsion speed and high yield, and the invention has strong engineering popularization and application values.
Drawings
Figure 1 is a schematic view of a face ripper head arrangement according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a face cut blasting borehole arrangement according to an embodiment of the invention;
figure 3 is a schematic view of the ventilation path and alternate face ripper head arrangement during face extraction according to an embodiment of the present invention.
In the figure: 1. a first tunneling working face; 2. a belt conveyor lane; 3. large mining height working face; 4. an auxiliary transport lane; 5. reserving a channel; 6. a return airway; 7. filling the wall with flexible concrete; 8. a third driving working face; 9. taking over the working face; 10. a second heading face; 11. cutting a top and drilling holes; 12. caving the goaf; 13. closing the wall permanently; 14. ventilating the transverse river; 15. and temporarily closing the wall.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 1 to 3, the invention provides a high-gas large-mining-height high-efficiency mining working face advanced roof cutting pressure relief gob-side entry retaining process, which comprises the following steps:
step S1, arranging a belt transport lane 2 on one side of the large mining height working face 3, arranging an auxiliary transport lane 4 and an air return lane 6 on the other side of the large mining height working face 3, wherein the belt transport lane 2 is positioned on one side of the large mining height working face 3, and the auxiliary transport lane 4 and the air return lane 6 are positioned on the same side of the large mining height working face 3. And then constructing a flexible mold concrete filling wall 7 on the side wall of the auxiliary transportation lane 4, arranging reserved channels 5 at intervals in the length direction of the flexible mold concrete filling wall 7 for ventilation, and tunneling a return airway 6 along the flexible mold concrete filling wall 7. The three roadways in step S1 generally correspond to the first driving face 1, the second driving face 10, and the third driving face 8, and it should be noted that, during actual field operation, the correspondence between the three roadways and the three driving faces may be exchanged, that is, the first driving face 1 may also be used as the auxiliary transport lane 4, the second driving face 10 may also be used as the belt transport lane 2, and the third driving face 8 may be used as the return air lane 6. The width of the second heading face 10 is L3, the width of the auxiliary conveyor lane 4 is L1, the width of the flexible mold concrete filling wall 7 is L2, and L3 is L1+ L2. L2 is 1.5 to 2m (e.g., 1.5m, 1.6m, 1.7m, 1.8m, 1.9m, 2 m). A reserved channel 5 is reserved at intervals of 50-100 m (such as 50m, 55m, 60m, 65m, 70m, 75m, 80m, 85m, 90m, 95m and 100m) in the length direction of the flexible mold concrete filling wall 7, the reserved channel 5 can be used for ventilation operation between the auxiliary transportation lane 4 and the return airway 6, and the width of the reserved channel 5 is 1-3 m (such as 1m, 1.2m, 1.6m, 1.8m, 2m, 2.5m, 2.8m and 3 m). The width of the return airway is L4, and L4 is 4-4.5 m (such as 4m, 4.1m, 4.2m, 4.3m, 4.4m and 4.5 m).
The large mining height working face refers to a working face with the mining height of more than 3.5m during whole-layer mining.
Further, the flexible mold concrete filling wall 7 is constructed behind the second tunneling working face 10 by a certain distance, the third tunneling working face is tunneled behind the flexible mold concrete filling wall by a certain distance, and the third tunneling working face is arranged next to the flexible mold concrete filling wall.
The tunnel corresponding to the first driving face 1 can be used as a belt conveying tunnel 2 of a large mining height face 3 in the future, namely a large tunnel for conveying raw coal by using a belt conveyor. The roadway corresponding to the second heading face 10 can be used as the auxiliary transportation roadway 4 of the large mining height working face 3 during mining, and the roadway corresponding to the third heading face 8 can be used as the return airway 6 of the working face in the future.
And step S2, after the three roadways in the step S1 are tunneled, cutting holes are tunneled on two sides of the large mining height working face 3, after the cutting holes are communicated, a temporary closing wall 15 is built in the reserved channel 5, the temporary closing wall 15 is used for closing the reserved channel 5, and a ventilation system for air intake of the belt transportation roadway 2 and the auxiliary transportation roadway 4 and air return of the air return roadway 6 is formed. The temporary closing wall 15 in step S2 is one of a wooden wall, a brick wall, or a high-water material filled wall. After the tunnel is tunneled and the cutting holes are communicated, the temporary closed wall 15 is constructed by adopting methods such as wood board wall, brick laying, high-water material filling and the like.
And step S3, before the stoping of the large mining height working face 3, arranging a top cutting drill hole 11 close to the inner side of the flexible mold concrete filling wall 7 in the auxiliary transportation lane 4, and performing presplitting blasting on the top plate. And arranging top-cutting drill holes 11 on the inner side of the concrete filling wall, and performing presplitting blasting on the top plate, wherein the drilling depth, the distance, the loading amount and the like can be determined according to the specific engineering field condition.
Step S4, after the large mining height working face 3 is mined, the roof automatically collapses and fills the collapsed goaf 12, the return airway 6 and the flexible mold concrete filling wall 7 are reserved, and the reserved return airway 6 is used as the belt transportation airway 2 for replacing the working face 9. So that the normal operation of the take-over face 9 is carried out in sequence.
Step S5, during the stoping of the large mining height working face 3, the temporary closing wall 15 in front of the large mining height working face 3 is removed to serve as a ventilation transverse channel 14 for assisting the ventilation between the transportation channel 4 and the return airway 6, meanwhile, a permanent closing wall 13 is constructed behind the working face, and the permanent closing wall 13 can be constructed by filling high-water materials or concrete to close the ventilation transverse channel 14 and isolate the goaf. After the temporary closing wall 15 in front of the working face is removed, the temporary closing wall is used as a ventilation transverse channel 14 for ventilation, after the working face pushes the ventilation transverse channel 14, the next temporary closing wall 15 in front of the working face is removed and then used as a new ventilation transverse channel 14, and the ventilation transverse channel 14 behind the working face builds a permanent closing wall 13 to isolate the caving goaf 12, so that the caving goaf 13 is well isolated under the condition of not influencing normal ventilation. After the ventilation crossroad 14 is closed, the gas in the caving goaf 12 is isolated, thereby avoiding entering the return airway 6 to cause the gas to exceed the limit. During stoping of the working face, air enters the belt conveying lane 2 and the auxiliary conveying lane 4, flows through the working face, then enters the return air lane 6 through a ventilation crossroad 14 formed by removing the temporary closing wall 15. During the stoping of the working face, two tunneling working faces can be arranged on the other side of the replacing working face 9, and the tunneling engineering is the same as the principle of the previous working face.
It should be noted that before recovery in the present invention refers to the tunneling period on both sides of the working face when the working face is not yet formed. The recovery period refers to the stage of starting recovery after the working face is arranged. Post-recovery refers not to the end of the recovery job but to a stage during recovery.
In conclusion, the invention adopts the partition wall constructed in advance, the partition wall can isolate the gas emitted from the caving goaf 12, the gas of the working face is prevented from exceeding the limit, the advanced roof cutting presplitting blasting is carried out at the same time, the roof automatically caving to fill the caving goaf 12, the return airway 6 is retained under the support of the anchor rod, the anchor rope and the flexible mold concrete filling wall 7, the retained flexible mold concrete continuous filling wall 7 can play a role in preventing the gangue of the caving goaf 12 from sliding down to the working face, thereby aiming at the mine area with larger gas emission amount, higher working face propelling speed and higher yield, the gob-side entry retaining of the high-gas large-mining high-efficiency working face can be realized, the partition wall is constructed in advance, the roof blasting is matched, the requirement of the mining progress of the high-gas large-mining high-efficiency mining working face can be met, and the gas of the goaf can be isolated at the same time, the gas of the working face is prevented from exceeding the limit, and the method has strong engineering popularization and application values.
The above description is only exemplary of the invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the invention is intended to be covered by the appended claims.
Claims (7)
1. The high-gas large-mining-height high-efficiency mining working face advanced roof cutting pressure relief gob-side entry retaining process is characterized by comprising the following steps of:
step S1, arranging a belt conveying lane on one side of the large mining height working face, arranging an auxiliary conveying lane and an air return lane on the other side of the large mining height working face, then constructing a flexible mold concrete filling wall on the side wall of the auxiliary conveying lane, arranging reserved channels at intervals in the length direction of the flexible mold concrete filling wall for ventilation, and then tunneling the air return lane along the flexible mold concrete filling wall;
step S2, after the three roadways in the step S1 are tunneled, cutting holes are tunneled on two sides of the working face of the large mining height, after the cutting holes are communicated, a temporary closing wall is built in the reserved channel and used for closing the reserved channel, and a ventilation system for air intake of the belt transportation roadway and the auxiliary transportation roadway and air return of the return airway is formed;
step S3, before stoping the large mining height working face, arranging a top cutting drill hole close to the inner side of the flexible mold concrete filling wall in the auxiliary transportation lane, and performing presplitting blasting on the top plate;
step S4, after the large mining height working face is mined, the roof automatically collapses and fills the collapsed goaf, and the return airway and the flexible mold concrete filling wall are reserved, and the reserved return airway is used as a belt transportation airway for replacing the working face;
and step S5, during the stoping period of the large mining height working face, removing the temporary closing wall in front of the large mining height working face to be used as a ventilation channel, and simultaneously constructing a permanent closing wall behind the large mining height working face to close the ventilation transverse channel and isolate the goaf.
2. The advanced roof cutting pressure relief gob-side entry retaining process for the high-efficiency mining working face with high gas and high mining height according to claim 1, wherein the working faces corresponding to the three roadways in the step S1 are a first tunneling working face, a second tunneling working face and a third tunneling working face, the width of the second tunneling working face is L3, the width of the auxiliary transportation roadway is L1, the width of the flexible mold concrete filling wall is L2, and L3 is L1+ L2.
3. The advanced roof cutting pressure relief gob-side entry retaining process for the high-gas large-mining-height high-efficiency working face according to claim 2, wherein L2 is 1.5-2 m.
4. The high-gas large-mining-height high-efficiency mining working face advanced roof-cutting pressure-relief gob-side entry retaining process according to claim 3, wherein the spacing distance between two adjacent reserved channels is 50-100 m.
5. The advanced roof cutting pressure relief gob-side entry retaining process for the high-efficiency mining working face with high gas and large mining height according to claim 2, wherein in the step S1, the flexible mold concrete filled wall is constructed after the second tunneling working face, the third tunneling working face is tunneled after the flexible mold concrete filled wall, and the third tunneling working face is arranged next to the flexible mold concrete filled wall.
6. The advanced roof cutting and pressure relief gob-side entry retaining process for the high-gas and high-efficiency mining working face according to claim 1, wherein the temporary closing wall in the step S2 is one of a wooden wall, a brick-built wall or a high-water material filling wall.
7. The advanced roof cutting pressure relief gob-side entry retaining process for the high-gas large-mining-height high-efficiency working face according to claim 4, wherein the width of the reserved channel is 1-3 m.
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| CN111625940A (en) * | 2020-05-12 | 2020-09-04 | 华北科技学院 | Island working surface exploitability demonstration method based on rock burst |
| CN111764901A (en) * | 2020-07-13 | 2020-10-13 | 重庆大学 | Method for inducing collapse of hard top plate of working face through mechanical cutting |
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| CN113446051A (en) * | 2021-07-30 | 2021-09-28 | 太原理工大学 | Goaf ultrahigh-position drill hole gas extraction method under roof cutting and roadway retaining process |
| CN113605893A (en) * | 2021-08-26 | 2021-11-05 | 河南理工大学 | Control method for pre-filled completely gob-side entry driving surrounding rock |
| CN114165233A (en) * | 2021-11-30 | 2022-03-11 | 中煤科工开采研究院有限公司 | Strong dynamic pressure coal seam roadway arrangement method along middle reserved wall |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111625940A (en) * | 2020-05-12 | 2020-09-04 | 华北科技学院 | Island working surface exploitability demonstration method based on rock burst |
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| CN111764901A (en) * | 2020-07-13 | 2020-10-13 | 重庆大学 | Method for inducing collapse of hard top plate of working face through mechanical cutting |
| CN111764901B (en) * | 2020-07-13 | 2022-03-25 | 重庆大学 | Method for inducing collapse of hard top plate of working face through mechanical cutting |
| CN112127933A (en) * | 2020-08-28 | 2020-12-25 | 晋城蓝焰煤业股份有限公司 | Method for adjusting long-distance tunneling working face through ventilation system |
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