CN110566204B - Mining method of large-dip-angle fully-mechanized coal mining face of local thick coal seam - Google Patents
Mining method of large-dip-angle fully-mechanized coal mining face of local thick coal seam Download PDFInfo
- Publication number
- CN110566204B CN110566204B CN201910725507.6A CN201910725507A CN110566204B CN 110566204 B CN110566204 B CN 110566204B CN 201910725507 A CN201910725507 A CN 201910725507A CN 110566204 B CN110566204 B CN 110566204B
- Authority
- CN
- China
- Prior art keywords
- coal
- mining
- support
- coal seam
- grouting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003245 coal Substances 0.000 title claims abstract description 241
- 238000005065 mining Methods 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000007704 transition Effects 0.000 claims abstract description 7
- 239000002023 wood Substances 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 238000005553 drilling Methods 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 9
- 239000011435 rock Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 5
- 239000011449 brick Substances 0.000 claims description 4
- 244000166124 Eucalyptus globulus Species 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000002775 capsule Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000012779 reinforcing material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 239000008262 pumice Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
The invention relates to the field of coal mining, and discloses a large-dip-angle fully-mechanized coal mining face mining method for a local thick coal seam. The method comprises the following steps of measuring the condition of the mined coal seam, and determining the inclination angle condition of the coal seam; according to the coal seam condition, under the condition of neglecting the thick coal seam section, performing support layout planning on other sections; setting reference points at the same positions of 3-8 planned supports at two ends of the thick coal seam section, and setting a reference straight line according to the reference points; in the support preliminarily planned by taking the reference straight line as the reference in the thick coal seam section, if the inter-support stubbles of the support are controlled within 2/3 of the height of a side guard plate of a top beam of the support, mining of top coal or bottom coal can be achieved independently by finely adjusting the position of the support, mining of the top coal or the bottom coal is reserved independently, or mining of part of the top coal and the bottom coal is reserved simultaneously; and (4) reversely planning a working face according to the planned support arrangement for mining. The method can ensure the stable transition of mining and effectively improve the production safety.
Description
Technical Field
The invention relates to the field of coal mining, in particular to a mining method of a large-dip-angle fully-mechanized coal mining face of a local thick coal seam.
Background
Combine and adopt the local coal seam thickening of working face, cause to combine and adopt the face support height to satisfy maximum supporting height, according to working face actual conditions analysis, in time according to the working face coal seam change and select the horizon stability, control working face adopts the height, and the accessible is stayed the top coal and is followed the coal seam bottom plate or is stayed the end coal and follow the coal seam roof and carry out the stoping. The literature, "discussion of leaving top coal or leaving bottom coal on the large-mining-height working face of a temple river mine" ("coal engineering" 2001, 12 th period, Liutao) discusses the yield and safety of mining of the top coal and the bottom coal, and the result shows that under certain conditions, part of the top coal and the bottom coal should be left on the working face reasonably. However, in actual production, the method of singly leaving top coal or singly leaving bottom coal is still adopted, so that the planning and the management are more convenient. In the mining of a large-dip-angle fully-mechanized mining face, the situation of having a thick coal seam often occurs, and how to realize the safe and stable transition of a local thick coal seam is the key of the mining of the coal seam.
Disclosure of Invention
The invention aims to solve the technical problem of providing a safe and stable mining method for a large-inclination-angle fully-mechanized coal mining face of a local thick coal seam.
The invention discloses a mining method of a large-dip-angle fully-mechanized coal mining face of a local thick coal seam,
measuring the condition of the mined coal seam, determining the inclination angle condition of the coal seam,
according to the coal seam condition, under the condition of neglecting the thick coal seam section, performing support layout planning on other sections;
setting reference points at the same positions of 3-8 planned supports at two ends of the thick coal seam section, and setting a reference straight line according to the reference points;
primarily planning a support in a thick coal seam section by taking a reference straight line as a reference, and if the inter-support alternate stubbles of the support are controlled within 2/3 of the height of a side guard plate of a top beam of the support, mining top coal or bottom coal alone by finely adjusting the position of the support, and mining the top coal or the bottom coal alone, or mining part of the top coal and the bottom coal simultaneously;
and (4) reversely planning a working face according to the planned support arrangement for mining.
Preferably, when the top coal or part of the top coal is left for mining and before the coal cutter cuts the coal, the wall of the coal wall of the working face is found to be spalled, the spalling depth exceeds 0.34m and is less than 0.6m, the frame is moved ahead in time, and the support with the side protection plate extends out of the side protection plate, so that the top of the side is protected firmly; when the end surface distance rib forming depth reaches 0.6-1.2 m, the frame is required to be moved in advance in time, a front canopy of the support is extended out, a semi-circular wood roof is added above the front canopy to be abutted, the support is extended out of a rib protecting plate to firmly protect the rib roof, when the rib forming depth exceeds the length of the front canopy of the support, a plate beam or a steel beam is utilized, one end of the plate beam or the steel beam is inserted above the front canopy of the support, and the other end of the plate beam or the steel beam is abutted against a;
when the bottom coal or part of the bottom coal is left for mining, the upper rocker arm and the lower rocker arm of the coal mining machine are reasonably lifted to cut coal, the lifting surface is lifted each time to form gentle transition with a gentle slope, the scraper-trough conveyer is leveled and tamped by eucalyptus, and the scraper-trough conveyer is stabilized by supporting prop pillars by using anti-skidding cylinders and single hydraulic props to prevent the scraper-trough conveyer from slipping to a transportation roadway.
Preferably, when the top coal or part of the top coal is left for mining, the walking speed of the unit must be slowed down when the unit cuts the coal to the section, the walking speed of the unit must not exceed 2m/s, and the unit cannot break the coal seam floor;
the coal is cut by the unit, the top moving frame is immediately wiped under pressure for supporting in time, and the support extends out of the side protecting plate in time to protect the coal side and prevent the top coal from caving or coal leakage along the coal wall.
Preferably, if the top coal collapses along the coal wall, a false roof is paved by using a metal net and the bracket is pulled against the coal wall so as to prevent the collapse range of the top coal from increasing and prevent the top coal from leaking into the working face along the overlarge gap between the brackets;
when the temporary support columns are erected and the metal nets are laid in the coal wall area, the temporary support columns and the metal nets are erected one by one from top to bottom.
Preferably, when the scraper conveyor is used for top-contacting and bottom-remaining coal mining, semi-circular wood is matched with gangue bricks to cushion the bottom, so that the support supporting height is ensured, and the top-contacting tightness can be achieved.
Preferably, the lifting slide is required to be operated from bottom to top one by one, simultaneous operation is strictly forbidden, and after the lifting slide is pushed for 2-3 m, the support is lifted onto the pallet one by one from top to bottom, so that the support can be normally connected to the top.
Preferably, during the support top-contacting operation, top contacting is carried out from a section where the top coal is already contacted, the phenomenon of reluctant top coal contacting on a working face cannot occur, and loose top coal is put down if the top coal cannot be contacted.
Preferably, if the support of the lifting roller section has large staggered stubbles, the state of the support needs to be adjusted in time, and the staggered stubbles are controlled within 2/3 of the height of the side guard plate of the top beam of the support.
Preferably, the maximum support height of the support is 3.5m, the mining height of a working face cannot exceed 3.3m, if an ultrahigh section and a normal section of the upper and lower mining heights are provided, the mining height is gradually increased, the phenomenon of large lifting and falling of the mining height cannot occur, the phenomenon that the support error exceeds the specified value is avoided, and the stubbles are not higher than 2/3 of the side guard plate of the top beam;
the lengthened column is completely extended out to reach the supporting height by the working face mining height super-high section support;
and the super high section adopts a Pi-shaped steel beam, a support wood and a semi-circular wood to erect an artificial false roof, so that the support can be smoothly connected to the top plate.
Preferably, the reinforcement is implemented by grouting, and the grouting method is as follows:
arranging holes in a single row, keeping 12-18-degree elevation angles with the coal wall of the working face at positions 0.2-0.4 m away from the top plate, enabling the holes to be 3-5m deep, drilling along the trend of the working face, arranging drill holes in the inclined direction, enabling the distance between the drill holes to be 4-6 m, arranging drill holes at positions 2-3 m away from the top plate at the ultrahigh section of the machine tail, arranging drill holes at positions 1m-0.5m away from the top plate downwards, and keeping 12-18-degree elevation angles between the drill holes and the coal wall of the working face;
the grouting process is completed according to three steps of drilling, inserting a grouting pipe and a grouting hole packer and grouting, and in the initial stage of grouting, the grouting pressure of equipment enables a capsule of the grouting hole packer to expand; when the grouting pressure exceeds a set value, an aluminum sheet at the front end of the grouting hole packer is broken, and grouting is started; after the slurry fills the drill hole, the slurry is pressed into the coal rock layer cracks due to the pressure of the grouting equipment, and after the slurry is pressed into the cracks, the Pasteur reinforcing material is quickly cured.
The invention has the beneficial effects that: on the basis of the existing mining modes of the top coal and the bottom coal, the invention further adopts measures to ensure that the mining is stably transited to the maximum extent under the condition of meeting the requirement of mining the top coal or the bottom coal as far as possible according to the actual condition, thereby effectively improving the production safety and avoiding the occurrence of accidents.
Detailed Description
The invention will be further described below by taking a working face of a certain coal mine 12392 as an example.
The 12392 face was located in the south of the +1220m horizontal twelve-panel; the north and the west of the working face are goafs, and the east is an unexplored solid coal seam. The coal seam mined on the working face is a 39# coal seam, belongs to a medium-thickness coal seam, is stable in occurrence, has the thickness of 2.75-3.0 m, the average thickness of 2.93m, the mining height of the coal seam of 2.95-3.2, the average thickness of 3.0m, contains 1-2 layers of sandwiched gangue, belongs to a coal seam with a complex structure, and has the structure of 2.47(0.25)0.28, the inclination angle of the coal seam of 6-14 degrees and the average inclination angle of 10 degrees. The industrial grade of the coal bed is lean coal, the mining index is 1, the coefficient of variation is 9 percent, and the coal bed belongs to a stable coal bed. The coal seam roof is a composite roof, the thickness of the composite roof is 1.0-5.6 m, the working face is influenced by geological structures, the length of a return airway is 217m, the length of a transport airway is 357m, and the super-length is 140 m.
The working face is constructed as follows
According to comprehensive analysis of actual exposure data of the roadway, the working face of the south 12392 is opened and cut to expose a reverse fault and a normal fault, so that the total thickness of a local coal seam exceeds 3.3m, the maximum cutting height of a coal mining machine and the maximum support height of a support are exceeded, the phenomenon that the support is not connected with the top locally exists in the stoping process, and the fault structure condition table in the table 1 is detailed.
TABLE 1 table of fault structure
The working face mining process comprises the following steps:
the working face adopts a moving-direction longwall retreating type comprehensive mechanized coal mining method for mining. The three-machine matched equipment comprises: ZQY3400/15/35 type hydraulic support, MG300/720-AWD type shearer, SGZ-730/400 type scraper conveyor.
The over-fault method is as follows:
(1) during the period that the working face passes through the fault, if the encountered rock stratum is soft, the machine set can be used for directly cutting the soft rock stratum to pass through the fault, and the bottom breaking height can ensure that the support and the machine set can normally pass through; if the encountered rock stratum is hard, the machine set can not directly cut through the rock stratum, and a drilling blasting method is adopted to carry out bedding method to cross the fault.
(2) When the unit cuts coal at a fault, people are strictly prohibited to operate or pass below the unit.
(3) When the machine set cuts coal to 5 meters in front of and behind the fault, the machine set slows down the walking speed, and the support moving personnel move the support forward to the coal side in time to support the top plate, so that roof collapse accidents are prevented.
(4) Personnel normally forbid entering the coal wall area for operation,
(5) when working at a fault, a safety supervisor, a team cadre and a team leader must command and supervise the work on site.
If the mining face has the pressure warning sign, people must be immediately withdrawn to a safe place where the top plate of the return airway or the transportation lane is completely supported, and the operation can be recovered after the pressure of the top plate is stable and the potential safety hazard is treated.
The mining height of the coal bed at the ultra-high section is specified as follows
1. The mining height of the working face is not more than 3.3m, and top coal mining can be properly reserved for ensuring that the normal walking of the unit and the bending degree of the scraper-trough conveyer do not exceed the specification. The ultrahigh section and the normal section of the upper and lower mining heights are gradually lifted to avoid the phenomenon of large lifting and falling of the mining heights, so that the phenomenon that the support deviation exceeds the specified value is avoided, and the deviation does not exceed 2/3 of the top beam side guard plate height.
2. The lengthened column is required to be completely extended out to reach the supporting height by the working face mining height super-high section support.
3. And the super high section adopts a Pi-shaped steel beam, a support wood and a semi-circular wood to erect an artificial false roof, so that the support can be smoothly connected to the top plate.
The technical specification of the unit opening is as follows:
1. in the ultrahigh section of the tail section, the opening of the upper is connected with the top, and the opening of the upper is sequentially carried out from the 73# bracket to the 49# bracket upwards (divided into two sections). And adopting a machine set opening mode to connect the roof. The opening width is 0.6m each time; the height should not be less than 2.8 m.
2. And laying metal nets above the opened upper, and connecting the metal nets of the frames into a whole by using 8# iron wires.
According to the actual exposure condition of a coal seam of a 12392 working face and the arrangement condition of a roadway of the working face, the local mining height of the working face reaches 4.0m, the maximum supporting height of a ZQY3400/15/35 type hydraulic support is 3.5m, and safe mining cannot be ensured, so that the mining height of the working face is controlled within 3.3m, and a section exceeding 2.8m is mined and planned in the following mode. Measuring the condition of the mined coal seam, determining the inclination angle condition of the coal seam, and performing support layout planning on other sections under the condition of neglecting thick coal seam sections according to the condition of the coal seam; and setting reference points at the same positions of 3-8 planned supports at two ends of the thick coal seam section respectively, wherein the number of the supports for setting the reference points is 5 at two ends of the thick coal seam section respectively, and the optimum number is the best. Setting a reference straight line according to the reference points, namely enabling the reference points to be positioned on the reference straight line or to be close to the reference straight line as much as possible; primarily planning a support in a thick coal seam section by taking a reference straight line as a reference, and if the inter-support alternate stubbles of the support are controlled within 2/3 of the height of a side guard plate of a top beam of the support, mining top coal or bottom coal alone by finely adjusting the position of the support, and mining the top coal or the bottom coal alone, or mining part of the top coal and the bottom coal simultaneously; and (4) reversely planning a working face according to the planned support arrangement for mining.
When the top coal or part of the top coal is left for mining, the mining height of the top coal section must be controlled within the maximum support height of the support and the support is supported by the support with a margin of about 20cm, for example, the mining height of the top coal section must be controlled within 3.3m in the embodiment, the mining height of the top coal section and the mining height of the normal mining sections at two sides must be in smooth transition, and the inter-frame stubbles of the support are controlled within 2/3 of the side guard plate height of the top beam of the support;
before a coal cutter cuts coal, the coal wall of a working face is found to be cracked, when the cracking depth exceeds 0.34m and is less than 0.6m, the frame is moved ahead in time, a support with a side protection plate extends out of the side protection plate, and the top of the side is firmly protected; when the end surface distance rib forming depth reaches 0.6-1.2 m, the frame is required to be moved in advance in time, a front canopy of the support is extended out, a semi-circular wood roof is added above the front canopy to be abutted, the support is extended out of a rib protecting plate to firmly protect the rib roof, when the rib forming depth exceeds the length of the front canopy of the support, a plate beam or a steel beam is utilized, one end of the plate beam or the steel beam is inserted above the front canopy of the support, and the other end of the plate beam or the steel beam is abutted against a;
the machine set driver controls the coal cutting height well, the mining height variation range is reduced, the frame must be pulled in time when the mining height of the working face varies greatly, the top beam of the support must be tightly attached to the coal wall and the coal side is protected, the working face must be supported immediately if the top plate is broken, namely the top plate is supported by moving the frame in time with pressure after the front roller of the coal mining machine cuts the top coal. When the top coal is left for mining, the walking speed of the unit must be slowed down when the unit cuts the coal to the section, the walking speed of the unit must not exceed 2m/s, and the unit cannot break the coal seam floor. When the thickness of the coal seam is reduced during the mining of the top coal, the thickness of the top coal is reduced, and the mining height transition of the working face is ensured to be stable. After the coal is cut by the unit, the support with the side protection plate needs to be immediately and timely supported in a manner of wiping the top moving frame with pressure, and the support with the side protection plate needs to be timely stretched out of the side protection plate to protect the coal side so as to prevent the top coal from caving or coal leakage along the coal wall.
If the top coal of the section collapses along the coal wall, the metal mesh can be used for laying the false roof and pulling the bracket against the coal wall to prevent the collapse range of the top coal from increasing and prevent the top coal from leaking into the working face along the overlarge gap between the brackets. When entering a coal wall area to support a temporary strut or lay a metal net, the operation must be carried out under the protection of a support and the top-knocking must be strengthened. When the temporary support columns are erected and the metal nets are laid in the coal wall area, the working face unit and the scraper-trough conveyer must be locked in a power failure mode. When the temporary support columns are erected and the metal nets are laid in the wall area, the temporary support columns and the metal nets are laid one by one from top to bottom, a specially-assigned person observes the safety conditions of the upper and the top, and when a problem is found, an alarm signal is sent out in time to inform an operator to withdraw into the support to avoid the problem. Because the inclination angle of the working face is large, the supports which can be abutted around the operation place must be subjected to secondary liquid supplement, and the initial supporting force of the supports is ensured to meet the requirements of operation regulations. The pulling frame must be pulled from top to bottom, and the parallel operation is strictly forbidden.
When the top coal or part of the top coal is left for mining, the mining height of the working face is controlled to be within 4/5 of the maximum support height of the support, and a section with the coal seam thickness exceeding 4/5 is mined in a mode of reserving bottom coal along the top plate of the coal seam;
when the bottom coal is mined, the upper rocker arm and the lower rocker arm of the coal mining machine are reasonably lifted to cut coal, the lifting surface is in gentle transition with a gentle slope when the coal mining machine is lifted each time, the scraper-trough conveyer is leveled and tamped by eucalyptus wood, and the scraper-trough conveyer is stabilized by supporting prop columns by using antiskid cylinders and single hydraulic supports to prevent the scraper-trough conveyer from sliding to a transportation lane.
When the scraper conveyor is used for top-contacting and bottom-remaining coal mining, semi-circular wood is used for being matched with gangue bricks to cushion the bottom, the support supporting height is guaranteed, and tight top-contacting can be achieved. The lifting carriage must be operated from bottom to top, simultaneous operation is strictly forbidden, and after the lifting carriage is pushed for 2.4m, the support is lifted to the pallet from top to bottom one by one, so that the support can be normally connected to the top. During the support top-contacting operation, the top contacting is carried out from the section where the top coal is already contacted, the phenomenon of reluctant top coal contact cannot occur on the working face, and if the top coal cannot be contacted, the loose top coal must be put down. If the support of the lifting and sliding section has large wrong stubbles, the state of the support must be adjusted in time, and the wrong stubbles are controlled within 2/3 of the height of the side guard plate of the top beam of the support, so that people are prevented from being injured by falling rocks on the top plate. When the chute is lifted to cut coal, the unit is strictly forbidden to break the bottom, and the unit must cut the top coal completely, so that the situation that the lifting section is low in mining height and the unit cannot pass through is avoided. Before the scraper-trough conveyer is lifted, a working face machine set and the scraper-trough conveyer are stopped to operate, a switch is locked, personnel stand positions are safe and stable, wood and gangue bricks are stably transmitted, and mutual shouting requires loud response. Because the inclination angle of the working face is large, the supports which can be abutted around the operation place must be subjected to secondary liquid supplement, and the initial supporting force of the supports is ensured to meet the requirements of operation regulations.
In the soft coal seam, the reinforcement can be realized by adopting a grouting mode, and the grouting mode is as follows:
grouting range: a 12392 south working face grouting area (a bracket is not connected with a top section) coal wall and a top plate; the specific range can be adjusted according to the field condition.
The construction sequence is as follows: finding and cleaning the umbrella peak of the upper part, pumice → temporary support → drilling → inserting pipe of the sealer → installing pump → connecting high-pressure air pipe → testing pump → connecting discharging pipe → connecting mixer → connecting grouting iron pipe → pumping grouting → changing hole → cleaning pump → cleaning tool and accessory → finishing.
Drilling machine: and (4) air drilling, and ensuring the aperture of the grouting hole to be 42 mm.
Arranging holes in a single row, keeping 12-18-degree elevation angles with the coal wall of the working face at positions 0.2-0.4 m away from the top plate, enabling the holes to be 3-5m deep, drilling along the trend of the working face, arranging drill holes in the inclined direction, enabling the distance between the drill holes to be 4-6 m, arranging drill holes at positions 2-3 m away from the top plate at the ultrahigh section of the machine tail, arranging drill holes at positions 1m-0.5m away from the top plate downwards, and keeping 12-18-degree elevation angles between the drill holes and the coal wall of the working face;
the grouting process is completed according to three steps of drilling, inserting a grouting pipe and a grouting hole packer and grouting, and in the initial stage of grouting, the grouting pressure of equipment enables a capsule of the grouting hole packer to expand; when the grouting pressure exceeds a set value, an aluminum sheet at the front end of the grouting hole packer is broken, and grouting is started; after the slurry fills the drill hole, the slurry is pressed into the coal rock layer cracks due to the pressure of the grouting equipment, and after the slurry is pressed into the cracks, the Pasteur reinforcing material is quickly cured.
Grouting auxiliary materials and tools: materials and tools for construction such as air and water pipelines, oil drums, high-pressure pipes, air drills, electric coal drills and 4-branch pipes are prepared before operation.
Claims (9)
1. The mining method of the large-dip-angle fully-mechanized coal mining face of the local thick coal seam is characterized by comprising the following steps,
measuring the condition of the mined coal seam, and determining the inclination angle condition of the coal seam;
according to the coal seam condition, under the condition of neglecting the thick coal seam section, performing support layout planning on other sections;
setting reference points at the same positions of 3-8 planned supports at two ends of the thick coal seam section, and setting a reference straight line according to the reference points;
primarily planning a support in a thick coal seam section by taking a reference straight line as a reference, and if the inter-support alternate stubbles of the support are controlled within 2/3 of the height of a side guard plate of a top beam of the support, mining top coal or bottom coal alone by finely adjusting the position of the support, and mining the top coal or the bottom coal alone, or mining part of the top coal and the bottom coal simultaneously;
a working face is reversely planned according to the planned support arrangement for mining;
when top coal or part of top coal is left for mining and before a coal cutter cuts coal, the wall of a working face is found to be striped, when the stripe depth exceeds 0.34m and is less than 0.6m, the frame is timely moved in advance, and a support with a side protection plate extends out of the side protection plate, so that the top of the side is protected firmly; when the end surface distance rib forming depth reaches 0.6-1.2 m, the frame is required to be moved in advance in time, a front canopy of the support is extended out, a semi-circular wood roof is added above the front canopy to be abutted, the support is extended out of a rib protecting plate to firmly protect the rib roof, when the rib forming depth exceeds the length of the front canopy of the support, a plate beam or a steel beam is utilized, one end of the plate beam or the steel beam is inserted above the front canopy of the support, and the other end of the plate beam or the steel beam is abutted against a;
when the bottom coal or part of the bottom coal is left for mining, the upper rocker arm and the lower rocker arm of the coal mining machine are reasonably lifted to cut coal, the lifting surface is lifted each time to form gentle transition with a gentle slope, the scraper-trough conveyer is leveled and tamped by eucalyptus, and the scraper-trough conveyer is stabilized by supporting prop pillars by using anti-skidding cylinders and single hydraulic props to prevent the scraper-trough conveyer from slipping to a transportation roadway.
2. The method for mining a high-dip-angle fully mechanized coal mining face of a local thick coal seam according to claim 1,
when the top coal or part of the top coal is left for mining, the walking speed of the unit must be slowed down when the unit cuts the coal to the section, the walking speed of the unit cannot exceed 2m/s, and the unit cannot break the coal bed bottom plate;
the coal is cut by the unit, the top moving frame is immediately wiped under pressure for supporting in time, and the support extends out of the side protecting plate in time to protect the coal side and prevent the top coal from caving or coal leakage along the coal wall.
3. The method for mining a high-dip-angle fully mechanized coal mining face of a local thick coal seam according to claim 1,
if the top coal collapses along the coal wall, a metal net is used for laying a false roof and a bracket is pulled against the coal wall so as to prevent the collapse range of the top coal from being enlarged and prevent the top coal from leaking into a working face along the overlarge gap between the brackets;
when the temporary support columns are erected and the metal nets are laid in the coal wall area, the temporary support columns and the metal nets are erected one by one from top to bottom.
4. The method for mining the large-inclination-angle fully-mechanized coal mining face of the local thick coal seam of claim 1, wherein during the top-meeting and bottom-leaving coal mining and chute lifting, semi-circle wood is used for matching with gangue bricks to cushion the bottom, so that the support height is ensured, and the top-meeting tightness can be achieved.
5. The mining method for the large-inclination-angle fully-mechanized coal mining face of the local thick coal seam according to claim 4, wherein the lifting slips must be operated from bottom to top, strictly forbidding simultaneous operation, and after the lifting slips are pushed for 2-3 m, the supports are lifted to the pallet from top to bottom, so that the supports can be normally connected to the top.
6. The mining method for the large-inclination-angle fully-mechanized coal mining face of the local thick coal seam of claim 4, wherein during support top-contacting operation, top contacting is carried out from a section where top coal is already contacted, the phenomenon that top coal is barely contacted cannot occur on the face, and loose top coal is put down if top coal cannot be contacted.
7. The mining method for the large-inclination-angle fully-mechanized coal mining face of the local thick coal seam of claim 4, wherein if the support of the lifting and sliding section is large in staggered stubble, the state of the support is adjusted in time, and the staggered stubble is controlled within 2/3 of the height of the side guard plate of the top beam of the support.
8. The method for mining a high-dip-angle fully mechanized coal mining face of a local thick coal seam according to claim 1,
the maximum support height of the support is 3.5m, the mining height of a working face cannot exceed 3.3m, if an ultrahigh section and a normal section of the upper mining height and the lower mining height are provided, the mining height is gradually increased, the phenomenon of large lifting and falling of the mining height cannot occur, the phenomenon that the support error exceeds the specified value is avoided, and the stubbles are not staggered beyond 2/3 of the top beam side guard plate;
the lengthened column is completely extended out to reach the supporting height by the working face mining height super-high section support;
and the super high section adopts a Pi-shaped steel beam, a support wood and a semi-circular wood to erect an artificial false roof, so that the support can be smoothly connected to the top plate.
9. The mining method for the large-inclination-angle fully-mechanized mining face of the local thick coal seam according to claim 1, characterized in that the reinforcement is carried out by adopting a grouting mode, and the grouting mode is as follows:
arranging holes in a single row, keeping 12-18-degree elevation angles with the coal wall of the working face at positions 0.2-0.4 m away from the top plate, enabling the holes to be 3-5m deep, drilling along the trend of the working face, arranging drill holes in the inclined direction, enabling the distance between the drill holes to be 4-6 m, arranging drill holes at positions 2-3 m away from the top plate at the ultrahigh section of the machine tail, arranging drill holes at positions 1m-0.5m away from the top plate downwards, and keeping 12-18-degree elevation angles between the drill holes and the coal wall of the working face;
the grouting process is completed according to three steps of drilling, inserting a grouting pipe and a grouting hole packer and grouting, and in the initial stage of grouting, the grouting pressure of equipment enables a capsule of the grouting hole packer to expand; when the grouting pressure exceeds a set value, an aluminum sheet at the front end of the grouting hole packer is broken, and grouting is started; after the slurry fills the drill hole, the slurry is pressed into the coal rock layer cracks due to the pressure of the grouting equipment, and after the slurry is pressed into the cracks, the Pasteur reinforcing material is quickly cured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910725507.6A CN110566204B (en) | 2019-08-07 | 2019-08-07 | Mining method of large-dip-angle fully-mechanized coal mining face of local thick coal seam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910725507.6A CN110566204B (en) | 2019-08-07 | 2019-08-07 | Mining method of large-dip-angle fully-mechanized coal mining face of local thick coal seam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110566204A CN110566204A (en) | 2019-12-13 |
| CN110566204B true CN110566204B (en) | 2021-06-01 |
Family
ID=68774755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910725507.6A Active CN110566204B (en) | 2019-08-07 | 2019-08-07 | Mining method of large-dip-angle fully-mechanized coal mining face of local thick coal seam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110566204B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102704935A (en) * | 2012-05-31 | 2012-10-03 | 库尔勒金川矿业有限公司 | Extra-long working surface fully mechanized coal mining process |
| CN102797464A (en) * | 2012-08-13 | 2012-11-28 | 大同煤矿集团有限责任公司 | Mining method for deterioration coal under intrusion of igneous rock |
| CN103775084A (en) * | 2014-01-26 | 2014-05-07 | 四川川煤华荣能源股份有限公司花山煤矿 | Construction technology of large-inclined-angle and large-mining-height fully-mechanized coal mining equipment passing through geological-structured fracture zone |
| CN104088638A (en) * | 2014-06-25 | 2014-10-08 | 西安科技大学 | Steep coal seam long-wall large-mining height workface coal wall caving and roof caving control technique |
| CN106522953A (en) * | 2016-12-27 | 2017-03-22 | 中国矿业大学(北京) | Dynamic segmented mining and caving technique for strike long-wall full-mechanized caving mining of high-dipping thick coal seam |
| CN108374660A (en) * | 2018-03-26 | 2018-08-07 | 四川川煤华荣能源股份有限公司 | Face in steep thick coal seam recovery method |
-
2019
- 2019-08-07 CN CN201910725507.6A patent/CN110566204B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102704935A (en) * | 2012-05-31 | 2012-10-03 | 库尔勒金川矿业有限公司 | Extra-long working surface fully mechanized coal mining process |
| CN102797464A (en) * | 2012-08-13 | 2012-11-28 | 大同煤矿集团有限责任公司 | Mining method for deterioration coal under intrusion of igneous rock |
| CN103775084A (en) * | 2014-01-26 | 2014-05-07 | 四川川煤华荣能源股份有限公司花山煤矿 | Construction technology of large-inclined-angle and large-mining-height fully-mechanized coal mining equipment passing through geological-structured fracture zone |
| CN104088638A (en) * | 2014-06-25 | 2014-10-08 | 西安科技大学 | Steep coal seam long-wall large-mining height workface coal wall caving and roof caving control technique |
| CN106522953A (en) * | 2016-12-27 | 2017-03-22 | 中国矿业大学(北京) | Dynamic segmented mining and caving technique for strike long-wall full-mechanized caving mining of high-dipping thick coal seam |
| CN108374660A (en) * | 2018-03-26 | 2018-08-07 | 四川川煤华荣能源股份有限公司 | Face in steep thick coal seam recovery method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110566204A (en) | 2019-12-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109209495B (en) | Roof cutting and pressure relief protection method on stoping surface of fully mechanized coal mining face | |
| CN101372891A (en) | Strip filling integral backstopping coal mining method | |
| CN104358572B (en) | Non-pillar mining technology by spontaneous caving filling roadway at large inclined angle steeply inclined seam | |
| WO2016206616A1 (en) | Equipment system for no-roadway no-coal-pillar retained roadway mining method | |
| CN104234749B (en) | A kind of fully-mechanized mining working big cross section return channel surrounding rock control method | |
| CN110145305B (en) | Method for preventing and treating rock burst of roadway by hydraulic roof cutting and roadway retaining | |
| CN111878080B (en) | Method for equipment withdrawal and self-lane-forming of withdrawal channel of fully mechanized coal mining face of coal mine | |
| CN106968671B (en) | The filling of underground coal mine coal working face return channel withdraws method | |
| CN107313777A (en) | The main return channel hydraulic fracturing pressure relief method of fully-mechanized mining working and device | |
| CN108843354A (en) | A kind of inclined super high seam lane top asymmetric anchor stalk method for protecting support of gob side entry driving | |
| CN109763861A (en) | One kind cutting intraocular fault belt treatment of roof collapse method | |
| Mark et al. | Horizontal stress and longwall headgate ground control | |
| CN110566204B (en) | Mining method of large-dip-angle fully-mechanized coal mining face of local thick coal seam | |
| WO2012009759A1 (en) | Hydraulic mining system for tabular orebodies utilising directional drilling techniques | |
| CN105937400B (en) | It is a kind of once to tunnel Liu Sheshuan lanes digging operation production line | |
| CN111828072A (en) | Arched flexible shield support and system for gob-side entry retaining of coal mine | |
| CN108952715B (en) | Gob-side entry driving top coal supporting and reinforcing method for inclined thick/extra-thick coal seam entry top | |
| CN110578539A (en) | control method for fully mechanized caving mining stability of large-dip-angle working face | |
| CN105937401B (en) | The method for protecting support in Liu Sheshuan lanes is once tunneled in a kind of U-shaped ventilation | |
| CN112127947B (en) | Roof cutting and pressure relief equipment and roof cutting and pressure relief method for end head of fully-mechanized coal mining face | |
| CN111980703B (en) | Lateral roof cutting pressure relief equipment and roof cutting pressure relief method for coal pillar dam body of underground reservoir | |
| CN103422870A (en) | Roof supporting method for full super-high seam mining | |
| Howe | Two Decades of Mobile Roof Support Applications | |
| CN112593938A (en) | Intelligent mining-based large-section roadway prefabricated wall body coal-pillar-free mining method | |
| CN204041114U (en) | A kind of pre-pick return channel section structure of fully-mechanized mining working |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 617066 Sichuan Chuanmei Huarong Energy Co., Ltd., xujiadu village, West District, Panzhihua City, Sichuan Province Patentee after: Sichuan Chuanmei Huarong Energy Co.,Ltd. Address before: 617066 Sichuan Chuanmei Huarong Energy Co., Ltd., xujiadu village, West District, Panzhihua City, Sichuan Province Patentee before: SICHUAN CHUANMEI HUARONG ENERGY CO.,LTD. |