CN112459779A - Pre-splitting pressure relief method for improving composite roof - Google Patents
Pre-splitting pressure relief method for improving composite roof Download PDFInfo
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- CN112459779A CN112459779A CN201910852471.8A CN201910852471A CN112459779A CN 112459779 A CN112459779 A CN 112459779A CN 201910852471 A CN201910852471 A CN 201910852471A CN 112459779 A CN112459779 A CN 112459779A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 238000005065 mining Methods 0.000 claims abstract description 92
- 238000005520 cutting process Methods 0.000 claims abstract description 87
- 238000005422 blasting Methods 0.000 claims abstract description 56
- 239000010878 waste rock Substances 0.000 claims abstract description 30
- 238000005553 drilling Methods 0.000 claims abstract description 17
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 230000000903 blocking effect Effects 0.000 claims description 34
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 7
- 239000002360 explosive Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 239000003245 coal Substances 0.000 abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 235000019738 Limestone Nutrition 0.000 description 4
- 239000006028 limestone Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009423 ventilation 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
- 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
- E21F17/18—Special adaptations of signalling or alarm devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- General Engineering & Computer Science (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention relates to the field of coal mining, and particularly discloses a presplitting pressure relief method for a modified composite roof plate, which comprises the following steps of (1) drilling a mining line roof cutting hole on a working face roof of a mining area at a mining line, and detonating from the center of the mining line to the direction of a transportation crossheading and a return air crossheading to form a mining line seam cutting surface; (2) carrying out advanced support in advanced blasting areas of a transportation gateway and a return air gateway on a working face; (3) carrying out top plate directional presplitting blasting on the transportation crossheading top cutting hole and the return air crossheading top cutting hole to form a transportation crossheading seam cutting surface and a return air crossheading seam cutting surface; (4) pushing and mining along the pushing and mining direction of the working face; (5) determining whether the waste rock retaining support is stable according to mine pressure monitoring, and carrying out guniting, leakage-preventing and fireproof treatment on a waste rock retaining reinforcing mesh; (6) and (4) drilling a mining stopping line top cutting hole on the top plate at the mining stopping line and blasting to form a mining stopping line seam cutting surface. Through the pre-splitting joint-cutting blasting of the four sides of the improved composite top plate, the complete top plate four-side supporting structure is changed into a four-side free structure, and the pressure of the top plate is reduced.
Description
Technical Field
The invention relates to the field of coal mining, in particular to a method for improving presplitting pressure relief of a composite roof.
Background
The North China coal field is an important coal field in China and is also one of the most serious coal fields threatened by underground water damage. The grouting transformation technology applied to the geological conditions can effectively isolate the aquifer and liberate deep coal resources seriously threatened by water damage. For the mineral seam threatened by the composite thin-layer limestone roof, such as 11 coals in the coal field in the north of the yellow river, the roof is a four-five-ash composite thin-layer limestone aquifer, is closely connected with the soleplate aquifer, and the roof has cracks and develops with larger water spraying amount. After the ore bed is transformed by grouting, the thin limestone with strong water content on the top plate is transformed into a weak water-containing bed or a water-free bed, so that the safe water-retaining mining of the ore bed is realized.
With the continuous perfection of coal mining methods and the improvement of mechanical equipment levels, gob-side entry retaining is widely applied to thin and medium-thickness coal seams with better conditions. Although the threat of water damage is temporarily solved to reform transform composite roof, the lithology of limestone roof is hard, and compressive strength has reached more than 100MPa, and hard roof's characterized in that it has higher intensity and integrality, is difficult for taking place to warp and break, and the roof contact still can't be cut off in the blasting of traditional single row drilling joint-cutting, leads to coming to press the step big, laterally forms long cantilever structure in the mining area. Because of the existence of the long cantilever, high additional stress is easily formed in gob-side entry retaining surrounding rocks, the cantilever is suspended for a long time without being opened, the long-term influence of the high additional stress on a roadway is caused, the stability of the gob-side entry retaining surrounding rocks is not facilitated, in addition, the pressure of a top plate cannot be transmitted to a bottom plate, the bottom plate presents a floor heave phenomenon, the stable structure of the bottom plate is extremely easy to damage, a water-bearing ash-making and ash-removing water-bearing layer is arranged in the range of 20m of the bottom plate of 11 coals, the damage depth of the bottom plate is increased due to the fact that the top plate does not collapse, water bursting accidents are easy.
Disclosure of Invention
The invention aims to provide a method for improving the presplitting pressure relief of a composite roof plate, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for reforming the presplitting pressure relief of a composite roof comprises the following steps:
(1) drilling a mining line top cutting hole on a mining area working face top plate at a mining line, and determining blasting parameters by taking the mining line top cutting hole as a blasting test area; detonating from the center of the mining line to the direction of the transportation gateway and the return air gateway to form a mining line seam cutting surface;
(2) in the process of top hole cutting blasting of a mining line, a reinforced anchor cable is adopted to support the transportation crossheading and the return air crossheading in advance within 10-15m of the advanced blasting area of the transportation crossheading and the return air crossheading of a working face; then, a temporary waste rock blocking support is arranged, the waste rock blocking support comprises a single hydraulic prop, a connecting beam, waste rock blocking I-shaped steel and a waste rock blocking reinforcing mesh, an ore pressure monitoring instrument is installed, and a support scheme is corrected in time according to an ore pressure monitoring result;
(3) according to blasting parameters determined by the mining line roof cutting holes, respectively drilling a transportation crossheading roof cutting hole and a return air crossheading roof cutting hole on the top plates of the transportation crossheading and the return air crossheading towards a working surface; carrying out top plate directional presplitting blasting on the transportation crossheading top cutting hole and the return air crossheading top cutting hole to form a transportation crossheading slit surface and a return air crossheading slit surface, adopting a reinforcing anchor cable to carry out advanced support on the transportation crossheading slit surface and the return air crossheading slit surface within a 10-15m advanced blasting area of the transportation crossheading slit surface and the return air crossheading slit surface, and carrying out secondary pre-tightening on the reinforcing anchor cable 5m behind the blasting area;
(4) pushing and mining along the pushing and mining direction of the working face, the top plate caving in time, and the two gate roads automatically forming the roadway of the next working face;
(5) in the pushing and mining process along with the pushing and mining direction of the working face, determining whether the waste rock blocking support is stable according to the first-stage monitoring result of mine pressure monitoring, withdrawing the single hydraulic prop and the matched connecting beam, and carrying out slurry spraying, leakage preventing and fire preventing treatment on the waste rock blocking reinforcing mesh;
(6) and after the working face is pushed to a stoping line, the fully mechanized mining support and the scraper conveyor are moved backwards, a stoping line roof cutting hole is arranged on a top plate at the stoping line according to the determined blasting parameters of the stoping line roof cutting hole and blasted to form a stoping line seam cutting face, the stoping line seam cutting face, a closed seam cutting face formed by the transportation crossheading seam cutting face, the return air crossheading seam cutting face and the stoping line seam cutting face, and the working face collapses after the fully mechanized mining support is moved out.
Further: the blasting parameters in the step (1) comprise drilling depth, drilling angle, explosive loading amount, explosive loading structure, plugging length and number of detonating holes.
Further: in the step (2), in advance support, an anchor rod needs to be arranged on the top plate, and the length of the anchor rod is not less than 1.5 m.
Further: and (3) in the step (2), the size of the bottom of the waste rock blocking I-steel is not less than 200mm, the waste rock blocking I-steel is vertical during installation, and the contact part with the top plate is tightly plugged by using a wood wedge.
Further: and (4) drilling holes at the cross positions between the transportation gate way and the top cutting holes of the mining start line and between the transportation gate way and the top cutting holes of the mining stop line in the step (3).
The method for improving the presplitting pressure relief of the composite roof plate as claimed in the claim or the claim, wherein cross drill holes are also arranged between the return air crossheading in the step (3) and the top cutting holes of the production starting line and the top cutting holes of the production stopping line respectively.
Further: and (4) hanging a wind screen along the top end of the waste rock blocking I-shaped steel in the step (4), and withdrawing the wind screen when the single hydraulic prop is withdrawn.
Further: and (5) determining that the amplitude of the gangue retaining and supporting pressure does not exceed +/-5% of the maximum within 10 days, and determining the gangue retaining and supporting pressure as stable.
Compared with the prior art, the invention has the beneficial effects that:
the method has the advantages that through pre-splitting joint-cutting blasting of the four sides (a mining starting line, an air return crossheading, a transportation crossheading and a mining stopping line) of the improved composite roof, a complete roof four-side supporting structure is changed into a four-side free structure, the connection between a goaf and a roadway roof is cut off, stress transfer between the roofs is also cut off, and roof pressure is reduced.
The mining line is used as a future goaf, a blasting test scheme can be carried out, the optimal blasting parameters are determined, the good blasting operation of the two crossheading and mining line roof cutting holes is ensured, and the damage of blasting to the roadway and equipment is avoided.
After the top plate is cut down, the top plate falls along with pushing mining, the pressure of the top plate is transmitted to the bottom plate in time, the damage depth of the bottom plate in the goaf is reduced, and water inrush accidents of the bottom plate are reduced.
Through the blasting of two crossheading presplitting joint cuts, can realize that the working face both sides are stayed the lane, and it can be for two adjacent working faces service to stay to establish the lane, has made things convenient for simultaneously to install the mining pressure observation instrument, makes it carry out long-term incessant mining pressure observation to the working face.
And at the corner connecting part of the top cutting holes of the two gate roads, the mining starting line and the mining stopping line, the drill hole inclines towards the direction of the goaf, so that the blasting effect at the intersection is ensured, and a complete joint cutting surface is formed.
Drawings
FIG. 1 is a top plan view of arrangement of hole positions of a top cutting hole of a coal face.
FIG. 2 is a top view of a coal face roof cut hole.
FIG. 3 is a three-dimensional view of a coal face roof cut hole.
Fig. 4 is a protection layout diagram of the gangue blocking support.
FIG. 5 is a top plate roof fall after face push mining.
In the figure: 1-cutting a top hole; 11-cutting a top hole of the extraction line; 12-cutting a top hole of the transportation crossheading; 13-top hole cutting of return air crossheading; 14-cutting a top hole of the stoping line; 15-drilling at the intersection; 2-cutting the seam surface; 21-thread cutting and sewing; 22-transporting the crossheading cut surface; 23-return air crossheading surface; 24-stopping the mining thread and cutting the seam surface; 3-transporting the crossheading; 4-return air crossheading; 5 working face mining direction; 6, working face of mining area; 7, waste rock blocking I-shaped steel; 8, a waste rock blocking reinforcing mesh; 9 single hydraulic prop; 10 connecting the beams, 11 top plate metal mesh.
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.
Referring to fig. 1 to 5, in an embodiment of the present invention, a method for modifying a composite roof to perform a presplitting pressure relief includes the following steps:
(1) as shown in fig. 3, a mining line topping hole 11 is drilled on a mining line to the top plate of a working face 6 of a mining area, blasting tests with different blasting parameters are designed by taking the mining line topping hole 11 as a blasting test area, blasting is carried out from the center of the mining line to the direction of a transportation crossheading 3 and a return air crossheading 4 to form a mining line slotting face 21, and optimal blasting parameters are determined according to test results, wherein the blasting parameters comprise drilling depth, drilling angle, explosive loading amount, explosive loading structure, plugging length and number of blasting holes;
(2) in the blasting process of the top hole 11 of the mining line, in the advanced blasting area range of 10-15m of the transportation crossheading 3 and the return air crossheading 4 on the working face, a reinforcing anchor rope is adopted to support the transportation crossheading 3 and the return air crossheading 4 in advance, when the advance support is carried out, if the integrity of a top plate is poor, an anchor rod is arranged on the top plate for modification, and the length of the anchor rod is not less than 1.5 m; a temporary waste rock blocking support is additionally arranged, the waste rock blocking support comprises a single hydraulic prop 9, a connecting beam 10, a waste rock blocking I-shaped steel 7 and a waste rock blocking reinforcing mesh 8, the horizontal bottom size of the waste rock blocking I-shaped steel 7 is not less than 200mm, the waste rock blocking I-shaped steel is vertical during installation, and the contact part of the waste rock blocking I-shaped steel and a top plate is tightly plugged by a wood wedge; installing a mine pressure monitoring instrument, and correcting a supporting scheme in time according to a mine pressure monitoring result;
(3) according to the determined blasting parameters of the mining line top cutting hole 11, a transportation crossheading top cutting hole 12 and a return air crossheading top cutting hole 13 are respectively drilled on the top plates of the transportation crossheading 3 and the return air crossheading 4 towards the working surface, a cross drilling hole 15 is respectively arranged between the transportation crossheading 3 and the mining line top cutting hole 11 and between the transportation crossheading 3 and the mining line top cutting hole 14, and the inclination angles of the top cutting hole 1 and the cross drilling hole 15 meet the design angles of the transportation crossheading 3 and the mining line top cutting hole 11 as well as the transportation crossheading 3 and the mining line top cutting hole 14; carrying out roof directional presplitting blasting on the transportation crossheading top cutting hole 12 and the return air crossheading top cutting hole 13 to form a transportation crossheading slit surface 22 and a return air crossheading slit surface 23, adopting a reinforcement anchor cable to support the transportation crossheading slit surface 22 and the return air crossheading slit surface 23 in advance in an advanced blasting area of 10-15m of the transportation crossheading slit surface 22 and the return air crossheading slit surface 23, and carrying out secondary pre-tightening on the reinforcement anchor cable 5m behind the blasting area;
(4) pushing and mining along the working face pushing and mining direction 5, timely caving the top plate, increasing the pressure of the bottom plate by caving gangue, reducing the damage depth of the bottom plate as shown in figure 5, blocking the caving gangue by the gangue blocking I-shaped steel 7 matched with the gangue blocking reinforcing mesh 8, and automatically forming the roadway of the next working face by the two crossheading; in order to avoid the influence of air leakage of the goaf on the ventilation effect during the stoping period of the working surface 6 of the mining area, a wind-blocking curtain is hung along the top end of the gangue-blocking I-steel 7, and the wind-blocking curtain is withdrawn when the single hydraulic prop 9 is withdrawn;
(5) the method comprises the following steps of (1) determining whether a waste rock blocking support is stable or not according to a first-stage monitoring result of mine pressure monitoring along with the pushing of a working face, withdrawing a single hydraulic prop 9 and a matched connecting beam 10, and determining that the amplitude of the waste rock blocking support is not more than +/-5% of the maximum within 10 days, namely the waste rock blocking support is stable, and carrying out slurry spraying, leakage preventing and fireproof treatment on a waste rock blocking reinforcing mesh 8;
(6) after the working face is pushed to a stoping line, the fully mechanized mining support and the scraper conveyor are moved backwards, according to the determined blasting parameters of the mining line roof cutting hole 11, the optimum blasting parameters of the mining line roof cutting hole 11 are used as the blasting parameters, the mining line roof cutting hole 14 is arranged on the top plate at the mining line stopping position of the working face and blasting is carried out to form a mining line cutting seam face 24, a closed cutting seam face consisting of the mining line cutting seam face 24, the transportation crossheading cutting seam face 22, the return air crossheading cutting seam face 23 and the mining line cutting seam face 21 is formed, and after the fully mechanized mining support is moved out, the working face collapses.
The method has the advantages that through pre-splitting joint-cutting blasting of the four sides (a mining starting line, an air return crossheading, a transportation crossheading and a mining stopping line) of the improved composite roof, a complete roof four-side supporting structure is changed into a four-side free structure, the connection between a goaf and a roadway roof is cut off, stress transfer between the roofs is also cut off, and roof pressure is reduced.
The mining line is used as a future goaf, a blasting test scheme can be carried out, the optimal blasting parameters are determined, the good blasting operation of the two crossheading and mining line roof cutting holes is ensured, and the damage of blasting to the roadway and equipment is avoided.
After the top plate is cut down, the top plate falls along with pushing mining, the pressure of the top plate is transmitted to the bottom plate in time, the damage depth of the bottom plate in the goaf is reduced, and water inrush accidents of the bottom plate are reduced.
Through the blasting of two crossheading presplitting joint cuts, can realize that the working face both sides are stayed the lane, and it can be for two adjacent working faces service to stay to establish the lane, has made things convenient for simultaneously to install the mining pressure observation instrument, makes it carry out long-term incessant mining pressure observation to the working face.
And at the corner connecting part of the top cutting holes of the two gate roads, the mining starting line and the mining stopping line, the drill hole inclines towards the direction of the goaf, so that the blasting effect at the intersection is ensured, and a complete joint cutting surface is formed.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The method for improving the presplitting pressure relief of the composite roof is characterized by comprising the following steps of:
(1) drilling a mining line top cutting hole on a mining area working face top plate at a mining line, and determining blasting parameters by taking the mining line top cutting hole as a blasting test area; detonating from the center of the mining line to the direction of the transportation gateway and the return air gateway to form a mining line seam cutting surface;
(2) in the process of top hole cutting blasting of a mining line, a reinforced anchor cable is adopted to support the transportation crossheading and the return air crossheading in advance within 10-15m of the advanced blasting area of the transportation crossheading and the return air crossheading of a working face; then, a temporary waste rock blocking support is arranged, the waste rock blocking support comprises a single hydraulic prop, a connecting beam, waste rock blocking I-shaped steel and a waste rock blocking reinforcing mesh, an ore pressure monitoring instrument is installed, and a support scheme is corrected in time according to an ore pressure monitoring result;
(3) according to blasting parameters determined by the mining line roof cutting holes, respectively drilling a transportation crossheading roof cutting hole and a return air crossheading roof cutting hole on the top plates of the transportation crossheading and the return air crossheading towards a working surface; carrying out top plate directional presplitting blasting on the transportation crossheading top cutting hole and the return air crossheading top cutting hole to form a transportation crossheading slit surface and a return air crossheading slit surface, adopting a reinforcing anchor cable to carry out advanced support on the transportation crossheading slit surface and the return air crossheading slit surface within a 10-15m advanced blasting area of the transportation crossheading slit surface and the return air crossheading slit surface, and carrying out secondary pre-tightening on the reinforcing anchor cable 5m behind the blasting area;
(4) pushing and mining along the pushing and mining direction of the working face, the top plate caving in time, and the two gate roads automatically forming the roadway of the next working face;
(5) in the pushing and mining process along with the pushing and mining direction of the working face, determining whether the waste rock blocking support is stable according to the first-stage monitoring result of mine pressure monitoring, withdrawing the single hydraulic prop and the matched connecting beam, and carrying out slurry spraying, leakage preventing and fire preventing treatment on the waste rock blocking reinforcing mesh;
(6) and after the working face is pushed to a stoping line, the fully mechanized mining support and the scraper conveyor are moved backwards, a stoping line roof cutting hole is arranged on a top plate at the stoping line according to the determined blasting parameters of the stoping line roof cutting hole and blasted to form a stoping line seam cutting face, the stoping line seam cutting face, a closed seam cutting face formed by the transportation crossheading seam cutting face, the return air crossheading seam cutting face and the stoping line seam cutting face, and the working face collapses after the fully mechanized mining support is moved out.
2. The method for improving the presplitting pressure relief of the composite roof plate according to claim 1, wherein the blasting parameters in the step (1) comprise drilling depth, drilling angle, explosive loading structure, plugging length and number of detonating holes.
3. The method for improving the presplitting pressure relief of the composite roof plate as claimed in claim 1, wherein the advance support in the step (2) requires bolting the roof plate, and the length of the bolting is not less than 1.5 m.
4. The method for improving the presplitting pressure relief of the composite roof plate according to claim 1, characterized in that the size of the bottom of the gangue blocking I-steel in the step (2) is not less than 200mm, the gangue blocking I-steel is kept vertical during installation, and the part in contact with the roof plate is tightly plugged by using a wood wedge.
5. The method for improving the presplitting pressure relief of the composite roof plate as claimed in claim 1, wherein in the step (3), holes at the intersections between the transportation crossroads and the mining-line roof cutting holes and between the transportation crossroads and the mining-line roof cutting holes are respectively arranged.
6. The method for improving the presplitting pressure relief of the composite roof plate as claimed in claim 1 or 5, wherein cross drill holes are also arranged between the return air crossheading in the step (3) and the mining line roof cutting holes respectively.
7. The method for improving the presplitting pressure relief of the composite roof plate according to claim 1, wherein a wind-shielding curtain is hung along the top end of the gangue-blocking I-shaped steel in the step (4), and the wind-shielding curtain is withdrawn when the single hydraulic prop is withdrawn.
8. The method for improving the presplitting pressure relief of the composite roof plate according to the claim 1, wherein the amplitude of the gangue retaining support pressure in the step (5) does not exceed +/-5% of the maximum within 10 days, and the pressure is considered to be stable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910852471.8A CN112459779A (en) | 2019-09-09 | 2019-09-09 | Pre-splitting pressure relief method for improving composite roof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910852471.8A CN112459779A (en) | 2019-09-09 | 2019-09-09 | Pre-splitting pressure relief method for improving composite roof |
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| CN112459779A true CN112459779A (en) | 2021-03-09 |
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| CN201910852471.8A Withdrawn CN112459779A (en) | 2019-09-09 | 2019-09-09 | Pre-splitting pressure relief method for improving composite roof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352282A (en) * | 2022-03-21 | 2022-04-15 | 华北科技学院(中国煤矿安全技术培训中心) | Short-distance auxiliary-roadway-free single-channel safe withdrawal method for near high-risk coal pillars |
-
2019
- 2019-09-09 CN CN201910852471.8A patent/CN112459779A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114352282A (en) * | 2022-03-21 | 2022-04-15 | 华北科技学院(中国煤矿安全技术培训中心) | Short-distance auxiliary-roadway-free single-channel safe withdrawal method for near high-risk coal pillars |
| CN114352282B (en) * | 2022-03-21 | 2022-06-17 | 华北科技学院(中国煤矿安全技术培训中心) | Short-distance auxiliary-roadway-free single-channel safe withdrawal method for near high-risk coal pillars |
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