CN110030031B - Method for long-wall recovery of pillar type goaf remaining coal pillars - Google Patents
Method for long-wall recovery of pillar type goaf remaining coal pillars Download PDFInfo
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- CN110030031B CN110030031B CN201910142718.7A CN201910142718A CN110030031B CN 110030031 B CN110030031 B CN 110030031B CN 201910142718 A CN201910142718 A CN 201910142718A CN 110030031 B CN110030031 B CN 110030031B
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- 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/60—Devices for withdrawing props or chocks
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
Abstract
The invention provides a method for recovering a pillar type goaf remaining coal pillar by a long wall, which comprises the following steps: designing components and proportion of the cemented filling body with coal as aggregate according to mine conditions and material characteristics; establishing a filling station to complete the crushing of coal and the preparation of a cemented filling body; conveying the filling body slurry to the underground room-and-column type goaf through a pipeline to fill the room-and-column type goaf; after the cemented filling body is solidified to the designed strength, arranging a longwall working surface in the room-and-column type goaf full of the cemented filling body; and (4) installing a stoping device, and mining and recovering the room-pillar type left coal pillars and the cemented filling bodies together. The method for recovering the remaining coal pillars in the room-and-column goaf by the longwall has the advantages of simple and mature mining method, good safety and high yield; the cemented filling body takes coal as aggregate, and has the obvious advantages of low cost, convenient material acquisition and no influence on coal quality after stoping.
Description
Technical Field
The invention relates to the technical field of room and pillar type mining and residual coal pillar recovery and mine filling mining, in particular to a method for recovering a room and pillar type goaf residual coal pillar by using a long wall.
Background
In recent years, with exhaustion of coal resources in the eastern region, the region of Shanshanmeng gradually becomes an important raw coal producing area and a coal output area in China. However, a large amount of room and pillar goafs are left in the area after years of mining, and the room and pillar goafs cause the following problems to the local area: 1) a great deal of high-quality coal resources are wasted. The coal mining rate of the room and pillar coal mining method is only 30-50%, the mining rate of small coal mines in some places is even less than 30%, and a large amount of high-quality left coal pillar resources are left in the well, so that a large amount of coal resources are wasted. 2) Risk of large area collapse of the top plate. Along with the time lapse, the coal pillar generates rheology, causes the roof large tracts of land to collapse suddenly, causes the earthquake of collapsing, brings the potential safety hazard for the production life in pit on the well. 3) The gob has a hidden danger of spontaneous ignition. 4) Destroy underground water and cause soil erosion. The coal pillar recovery technology adopted in the past has the problems that the ventilation problem cannot be solved, the roof management difficulty is high, the left coal pillars are easy to lose stability suddenly, the recovery efficiency is low and the like, and a safe and efficient recovery method is lacked.
Disclosure of Invention
The invention aims to solve the technical problem of providing a safe and efficient method for recovering the remaining coal pillars in the room-pillar type goaf by using the long wall.
In order to solve the technical problem, the invention provides a method for recovering a remained coal column in a room-column type goaf by a long wall, which comprises the following steps:
designing components and proportion of the cemented filling body with coal as aggregate according to mine conditions and material characteristics;
establishing a filling station to complete the crushing and preparation of the cemented filling body;
conveying the cemented filling body to the room and column type goaf through a pipeline to fill the room and column type goaf;
after the cemented filling body is solidified to the designed strength, arranging a longwall mining working face in the room-and-column type goaf full of the cemented filling body;
and (4) installing a stoping device on the longwall mining working face, and longwall mining and recovering the room-pillar type remaining coal pillars and the cemented filling bodies together.
Furthermore, each cubic of the cemented filling body comprises 1300 Kg of coal used as coarse aggregate and 1600Kg of fly ash used as fine aggregate, 30 Kg to 50Kg of cementing material, 3.0 Kg to 6.5Kg of accelerating agent, 1.5 Kg to 3.5Kg of water reducing agent and 660Kg of mine water 510-.
Further, the coal is coal blocks or coal particles with the particle size of less than 24mm after secondary crushing, wherein the coal blocks or the coal particles with the particle size of 20mm-24mm account for 1% -5%, the coal particles with the particle size of 17.5mm-20mm account for 1% -5%, the coal particles with the particle size of 13.5mm-17.5mm account for 10% -15%, the coal particles with the particle size of 9mm-13.5mm account for 20% -25%, the coal particles with the particle size of 5mm-9mm account for 25% -35%, the coal particles with the particle size of 4.3mm-5mm account for 10% -15%, the coal particles with the particle size of 0.1mm-4.3mm account for 6% -12%, and the coal particles with the particle size of 0.075mm-0.1mm account for 2% -6%.
Further, the fly ash is second-level or third-level fly ash in a power plant, the cementing material is one or more of 32.5 or 42.5-level ordinary portland cement, carbide slag and steel slag, and the accelerating agent is prepared from aluminum oxide clinker, sodium carbonate and quick lime according to the mass ratio of 1.1: 1.1: 0.6, the water reducing agent is a lignosulfonate water reducing agent, and the mine water is mine drainage water.
Further, the filling station comprises a crushing system, a stirring system, a pumping system and an automatic control system, and the filling station is arranged on the ground.
Further, the bottom of the filling drill hole of the filling station is required to reach the filled room-and-pillar type goaf coal seam.
Furthermore, when the cemented filling body is filled into the room-and-column type goaf, segmented filling is adopted, one section is arranged every 10-20m, a retaining wall is arranged to separate and seal the cemented filling body of each filling section, and the retaining wall can be in the form of an air bag, a mold bag or a wood point column.
Further, in order to ensure the filling roof-contacting effect, the filling area adopts a method of embedding a filling pipeline in the top plate.
Furthermore, the arrangement of the longwall working surface is that after the filling body is solidified to reach the design strength, the gate groove and the cut hole are tunneled and arranged in the room-and-column type goaf full of the cemented filling body;
further, the longwall mining is that after the longwall mining working face is arranged, equipment comprising a coal mining machine and a hydraulic support is installed, and the coal pillar and the cemented filling body are mined and recovered together in the longwall mining.
The invention provides a method for recovering a room and pillar type goaf remaining coal pillar, which comprises the steps of filling the room and pillar type goaf with a cemented filling body taking coal as aggregate, then arranging a longwall working surface, and finally recovering the cemented filling body taking coal as aggregate and the room and pillar type remaining coal pillar together.
Drawings
Fig. 1 is a plan view of a room-and-pillar type goaf in a method for longwall recovery of a left coal pillar in the room-and-pillar type goaf according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for longwall recovery of pillars left in a pillar-type goaf according to an embodiment of the present invention;
fig. 3 is a structural diagram of a filling system of a filling station in a method for recovering a pillar left in a pillar type goaf in a longwall manner according to an embodiment of the present invention;
fig. 4 is a plan view of the room-and-pillar type goaf after filling in the method for recovering the left coal pillars of the room-and-pillar type goaf with a long wall according to the embodiment of the present invention;
fig. 5 is a longwall mining plan view of a method for longwall pillar recovery of a pillar type goaf remaining coal pillar according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, due to improper mining for years, a large number of room and pillar mined-out areas are left in some coal mines, a large number of left coal pillars 19 are left in the coal mining room 20, the size L of the coal room 20 of the room and pillar mined-out areas is often 3-6M, the size M of the coal pillars 19 is often 6-15M, and the coal pillars 19 and the roof can keep good stability. A large amount of high-quality coal pillars in the room and column type goaf are left underground, so that a large amount of coal resources are wasted, meanwhile, a large amount of hidden dangers are brought to the local area in the room and column type goaf, and a safe and efficient recovery method is not provided at present.
Based on the consideration, the invention provides the idea and the method for mining and recovering the residual coal pillar together with the filling body by firstly filling the room-and-column type goaf by using the coal as the aggregate (the coal aggregate accounts for more than 90 percent of the solid material of the slurry) cementing body to enable the goaf to become a solid body and then arranging the longwall working surface.
Referring to fig. 2, the invention provides a method for recovering a room-and-pillar type goaf remaining coal pillar, which comprises the following steps:
step 1: the components and the proportion of the cemented filling body taking coal as aggregate are designed according to the specific conditions and material characteristics of a mine, and the method comprises the steps of determining the proportion of the cemented filling body of the coal aggregate, the particle size of coal and other required additives, so that the mass concentration of slurry reaches 75-83%, and the slump reaches 22-30cm, and the fluidity of filling slurry and the strength of the solidified filling body meet the filling use requirements. Wherein each cubic of the cemented filling body comprises 1300 Kg of coal used as coarse aggregate, 60Kg to 100Kg of fly ash used as fine aggregate, 30 Kg to 50Kg of cementing material, 3.0 Kg to 6.5Kg of accelerating agent, 1.5 Kg to 3.5Kg of water reducing agent and 660Kg of mine water 510-. The coal is coal blocks or coal particles with the particle size of less than 24mm after secondary crushing, 1% -5% of the particles with the particle size of 20mm-24mm, 1% -5% of the particles with the particle size of 17.5mm-20mm, 10% -15% of the particles with the particle size of 13.5mm-17.5mm, 20% -25% of the particles with the particle size of 9mm-13.5mm, 25% -35% of the particles with the particle size of 5mm-9mm, 10% -15% of the particles with the particle size of 4.3mm-5mm, 6% -12% of the particles with the particle size of 0.1mm-4.3mm and 2% -6% of the particles with the particle size of 0.075mm-0.1 mm. The fly ash is second-grade or third-grade fly ash of a power plant, and the cementing material is 32.5 or 42.5-grade ordinary portland cement, carbide slag or steel slag. The accelerating agent is an aluminum oxide clinker with the main components of sodium aluminate, sodium carbonate and quick lime according to the mass ratio of 1.1: 1.1: 0.6, the water reducing agent is a lignosulfonate water reducing agent, and the mine water is mine drainage water.
Step 2: referring to fig. 3, a filling station is established at the surface. The filling station comprises a crushing system, a stirring system, a pumping system and the like. The method comprises the steps of conveying coal 1 to a crusher 3 through a loader 2, crushing the coal 1 to a required particle size, storing the crushed coal in a crushed coal bin 4, weighing the crushed coal (through a weighing belt 5), coal ash (stored in a coal ash bin 14), cementing material (stored in a coal ash bin 15) and water (stored in a water pool 16) through a weighing hopper 6 according to a design ratio, conveying the weighed crushed coal into a high-speed stirring barrel 7 and a forced stirring machine 8 for stirring to form coal aggregate cementing slurry after stirring, opening a discharge port, conveying the slurry into a filling pump, conveying the pressurized slurry into the underground through a ground pipeline 10 and a vertical drilling pipeline 17, conveying the slurry into an underground room-and-pillar type goaf through an underground filling pipeline 18, and filling a mined-out coal room 20. The surface pipe is installed with a concentration meter 11, a pressure meter 12 and a flow meter 13 to monitor the flow state of slurry in the pipe.
And step 3: referring to fig. 4, the coal aggregate cementing slurry enters the underground room and pillar type goaf through the underground filling pipeline 18, and the coal room 20 is filled until the coal aggregate cementing slurry is filled in the whole room and pillar type goaf. When the room and column type goaf is filled with slurry, sectional filling is adopted, one section is arranged every 10-20m, and a retaining wall 22 is constructed to realize the blocking and sealing of the coal aggregate cementing slurry of each filling section. The retaining wall 22 may take the form of an air bag, a molded bag, or a wood point post. In addition, in order to ensure the roof-contacting effect, measures such as embedding a filling pipeline in the top plate and the like should be taken by the pipeline. And forming a cemented filling body 21 after the coal aggregate cemented slurry is solidified, wherein the designed uniaxial compressive strength of the cemented filling body is 1.0-2.0MPa in 28 days.
And 4, step 4: referring to fig. 5, after the cemented filling body is filled with the room and column type goaf and the compressive strength of the single shaft reaches the design index, a long-wall working surface is arranged in the room and column type goaf, a return air crossheading 2, a return air crossheading 24 and a cut hole 25 are constructed, and the inclination length and the trend length of the long-wall working surface are determined according to the actual situation after the room and column type goaf is filled with the cemented filling body.
And 5: referring to fig. 5, a mining and supporting device is installed on the longwall face, and comprises a coal mining machine 27 and a hydraulic support 26, the coal mining machine 27 and the hydraulic support 26 are driven forwards along the directions of the return air crossheading 2 and the return air crossheading 24, the coal pillars 19 and the coal aggregate cemented filling bodies 21 are recovered together, and a longwall face goaf 28 is formed after recovery.
The method for recovering the remaining coal pillars in the longwall room-and-pillar type goaf, provided by the invention, comprises the steps of filling the goaf with the cemented filling body using coal as aggregate, then arranging the longwall working face, and recovering the cemented filling body and the remaining coal pillars together, wherein the mining method is simple and mature, and has good safety and high yield; the cemented filling body takes coal as aggregate, and has the obvious advantages of low cost, convenient material acquisition and no influence on coal quality after stoping.
The method for recovering the left coal pillar in the room-and-pillar type goaf provided by the invention is specifically described by the following specific embodiment.
Example 1
In a room-and-pillar type goaf under a certain mine, the burial depth H is 410M, the mining thickness M is 3M, the mining width L is 6M, and the remaining coal pillar width D is 6M. The coal aggregate filling body comprises the following components in percentage by cubic: 1394Kg of coal; 66Kg of fly ash; 40Kg of cementing material; 5.5Kg of admixture accelerator and 2.5Kg of water reducer; 590Kg of mine water. The mass concentration of the slurry is 71.9 percent, the slump is 23cm, and the 28d uniaxial compressive strength is 1.1 MPa.
The coal is coal blocks and coal particles with the particle size of less than 24mm after secondary crushing, the coal is coking coal, the particle size of 20mm-24mm accounts for 4%, the particle size of 17.5mm-20mm accounts for 5%, the particle size of 13.5mm-17.5mm accounts for 12%, the particle size of 9mm-13.5mm accounts for 23%, the particle size of 5mm-9mm accounts for 29%, the particle size of 4.3mm-5mm accounts for 16%, the particle size of 0.1mm-4.3mm accounts for 8%, and the particle size of 0.075mm-0.1mm accounts for 3%.
The fly ash is second-grade fly ash of a power plant, the cementing material is 32.5-grade ordinary portland cement, and the accelerating agent is prepared from aluminum oxide clinker, sodium carbonate and quick lime according to the mass ratio of 1.1: 1.1: 0.6, the water reducing agent is a lignosulfonate water reducing agent, and the mine water is mine drainage water.
The preparation, filling and longwall face mining of coal aggregate cemented filling slurry described in this embodiment include the following steps:
(a) preparing filling slurry: firstly, performing primary crushing on coal by a jaw crusher, controlling the discharge particle size to be 55-95mm respectively, screening the primarily crushed coal by using a vibrating screen, performing secondary crushing on coal particles with the particle size larger than 24mm by using a secondary crusher, enabling the particle size of the treated coal particles to be smaller than 24mm, enabling the coal particles after secondary crushing to pass through a grading vibrating screen, and then matching according to the particle size grading specification and the design proportion for use;
(b) surface stirring and pumping: preparing raw materials such as fly ash, cementing material, accelerating agent, water reducing agent, mine water and the like, putting the raw materials into a stirrer through a feeding system or a water pump according to a ratio, opening a discharge hole after stirring, wherein the mounting position of the discharge hole is higher than a feed inlet of a slurry hopper of a filling pump, feeding the coal aggregate cementing slurry into the slurry hopper of the filling pump, feeding the coal aggregate cementing slurry into a down-hole room column type goaf through a filling pipeline under the pressurization effect of a ground filling pump, and enabling the filling capacity to be 150m3/h。
(c) Filling in the well: when the uniaxial compressive strength of the filling body reaches 1.1MPa, taking the filling body as a filling section every 20m in the room-and-column type goaf coal room, building retaining walls at two ends of the filling section to realize the blocking and sealing of slurry in the filling section, wherein the retaining walls adopt a mould bag form; because the top plate is not necessarily flat, measures such as embedding a filling pipeline in the top plate and the like are taken to ensure the roof-contacting effect of the filling body.
(d) Arrangement of long-wall working surface: arranging a long-wall working face (with the trend of 200m long and the trend of 2000m long) in the filled room-and-column type goaf, excavating a cut hole and 2 crossroads along a coal room of the room-and-column type goaf (or planning and reserving in advance), and installing production equipment and ventilation equipment (or systems) such as a coal mining machine SL300, a hydraulic support ZY10000/16/32D, a scraper conveyor SGZ1000/2 multiplied by 1000 and the like to meet the requirements of safety and production capacity.
(e) Longwall face mining: the extraction process flow is as follows: coal cutter cuts coal and fills the body → moves the frame → pushes the scraper conveyor. The coal cutter is adopted to cut coal and a filling body, the mining height is 3m, two cutters are fed back and forth once, and the cutter feeding adopts a triangular coal cutting end beveling cutter feeding mode. The production capacity is designed to be 5000 t/d.
Example 2
In a certain underground pillar type goaf, the coal seam inclination angle alpha is 5 degrees, the burial depth H is 570M, the mining thickness M is 4.5M, the mining width L is 5M, and the remaining coal pillar width D is 8M. The adopted coal aggregate filling body comprises the following components in percentage by weight: 1450Kg of coal; 66Kg of fly ash; 42Kg of cementing material; 6.1Kg of admixture accelerator and 1.9Kg of water reducer; 574Kg of mine water. The mass concentration of the slurry is 72.4 percent, the slump is 23.5cm, and the 28d uniaxial compressive strength is 1.5 MPa.
The coal is coal blocks and coal particles with the particle size of less than 20mm after secondary crushing, the coal is anthracite, the particle size accounts for 7% of 17.5-20 mm, the particle size accounts for 15% of 13.5-17.5 mm, the particle size accounts for 22% of 9-13.5 mm, the particle size accounts for 27% of 5-9 mm, the particle size accounts for 17% of 4.3-5 mm, the particle size accounts for 8% of 0.1-4.3 mm, and the particle size accounts for 4% of 0.075-0.1 mm.
The fly ash is three-level fly ash of a power plant, the cementing material is 42.5-level ordinary portland cement, and the accelerator is prepared from aluminum oxide clinker, sodium carbonate and quick lime according to the mass ratio of 1.1: 1.1: 0.6, the water reducing agent is a lignosulfonate water reducing agent, and the mine water is mine drainage water.
The preparation, filling and longwall face mining of coal aggregate cemented filling slurry described in this embodiment include the following steps:
(a) preparing filling slurry: firstly, performing primary crushing on coal by a jaw crusher, controlling the discharge particle size to be 50-91mm respectively, screening the primarily crushed coal by using a vibrating screen, performing secondary crushing on coal particles with the particle size of more than 20mm by using a secondary crusher, enabling the particle size of all the treated coal particles to be less than 20mm, and enabling the coal particles after secondary crushing to pass through a grading vibrating screen and then to be matched according to the particle size grading specification and the design proportion for use;
(b) surface stirring and pumping: preparing raw materials such as fly ash, cementing material, accelerating agent, water reducing agent, mine water and the like, putting the raw materials into a stirrer through a feeding system or a water pump according to a ratio, opening a discharge hole after stirring, wherein the mounting position of the discharge hole is higher than a feed inlet of a slurry hopper of a filling pump, feeding the coal aggregate cementing slurry into the slurry hopper of the filling pump, feeding the coal aggregate cementing slurry into a down-hole room column type goaf through a filling pipeline under the pressurization effect of a ground filling pump, and enabling the filling capacity to be 160m3/h。
(c) Filling in the well: taking every 18m in a room-and-column type goaf coal room as a filling section, building retaining walls at two ends of the filling section to realize the blocking and sealing of slurry in the filling section, wherein the retaining walls are in an air bag form; because the top plate is not necessarily flat, measures such as embedding a filling pipeline in the top plate and the like are taken to ensure the roof-contacting effect of the filling body.
(d) Arrangement of long-wall working surface: when the uniaxial compressive strength of the filling body reaches 1.5MPa, a longwall working face (with the inclination length of 185m and the trend length of 2000m) is arranged in the filled room-and-column type goaf, a cut hole and 2 crossroads are tunneled (or planned and reserved in advance) along a coal room of the room-and-column type goaf, production equipment and ventilation equipment (or systems) such as a coal mining machine SL-500, a hydraulic support ZY10000/24/50, a scraper conveyor SGZ1200/2 multiplied by 1000 and the like are installed, and the requirements of safety and production capacity are met.
(e) Longwall face mining: the extraction process flow is as follows: coal cutter cuts coal and fills the body → moves the frame → pushes the scraper conveyor. The coal cutter is adopted to cut coal and a filling body, the mining height is 4.5m, two cutters are fed back and forth once, and the cutter feeding adopts a triangular coal cutting end beveling cutter feeding mode. And designing the production capacity of 6500 t/d.
Example 3
In a certain underground pillar type goaf, the coal seam inclination angle alpha is 7 degrees, the burial depth H is 634M, the mining thickness M is 5.8M, the mining width L is 4M, and the remaining coal pillar width D is 9M. The adopted coal aggregate filling body comprises the following components in percentage by weight: 1503Kg of coal; 70Kg of fly ash; 35Kg of cementing material; 5.2Kg of admixture accelerator and 2.8Kg of water reducer; 612Kg of mine water. The mass concentration of the slurry is 72.5 percent, the slump is 22.5cm, and the 28d uniaxial compressive strength is 1.7 MPa.
The coal is coal blocks and coal particles with the particle size of less than 22mm after secondary crushing, the coal type is lean coal, 4% of the particles with the particle size of 22mm-20mm, 5% of the particles with the particle size of 17.5mm-20mm, 11% of the particles with the particle size of 13.5mm-17.5mm, 24% of the particles with the particle size of 9mm-13.5mm, 31% of the particles with the particle size of 5mm-9mm, 11% of the particles with the particle size of 4.3mm-5mm, 8% of the particles with the particle size of 0.1mm-4.3mm and 6% of the particles with the particle size of 0.075mm-0.1 mm.
The coal ash is power plant three-level coal ash, the cementing material is carbide slag, and the accelerating agent is prepared from aluminum oxide clinker, sodium carbonate and quicklime according to the mass ratio of 1.1: 1.1: 0.6, the water reducing agent is a lignosulfonate water reducing agent, and the mine water is mine drainage water.
The preparation, filling and longwall face mining of coal aggregate cemented filling slurry described in this embodiment include the following steps:
(a) preparing filling slurry: firstly, performing primary crushing on coal by a jaw crusher, controlling the discharge particle size to be 56-97mm respectively, screening the primarily crushed coal by using a vibrating screen, performing secondary crushing on coal particles with the particle size larger than 22mm by using a secondary crusher, enabling the particle size of the treated coal particles to be smaller than 22mm, enabling the coal particles after secondary crushing to pass through a grading vibrating screen, and then matching according to the particle size grading specification and the design proportion for use;
(b) surface stirring and pumping: preparing fly ash and cementingThe method comprises the following steps of putting raw materials such as a material, an accelerator, a water reducer, mine water and the like into a stirrer in proportion through a feeding system or a water pump, opening a discharge hole after stirring is finished, wherein the installation position of the discharge hole is higher than a feed inlet of a slurry hopper of a filling pump, coal aggregate cementing slurry enters the slurry hopper of the filling pump, enters a down-hole room column type goaf through a filling pipeline under the pressurization effect of a ground filling pump, and the filling capacity is 200m3/h。
(c) Filling in the well: taking every 15m in a room-and-column type goaf coal room as a filling section, building retaining walls at two ends of the filling section to realize the blocking and sealing of slurry in the filling section, wherein the retaining walls are in a wood-point column form; because the top plate is not necessarily flat, measures such as embedding a filling pipeline in the top plate and the like are taken to ensure the roof-contacting effect of the filling body.
(d) Arrangement of long-wall working surface: when the uniaxial compressive strength of the filling body reaches 1.7MPa, a longwall working surface (with the inclination length of 225m and the trend length of 2000m) is arranged in the filled room-and-column type goaf, holes are cut and 2 crossroads are tunneled (or planned and reserved in advance) along a coal room of the room-and-column type goaf, production equipment and ventilation equipment (or systems) such as a coal mining machine 7LS7, a hydraulic support ZY13000/28/62D, a scraper conveyor SGZ1250/3 multiplied by 1000 and the like are installed, and the requirements of safety and production capacity are met.
(e) Longwall face mining: the extraction process flow is as follows: coal cutter cuts coal and fills the body → moves the frame → pushes the scraper conveyor. The coal cutter is adopted to cut coal and a filling body, the mining height is 5.8m, two cutters are fed back and forth once, and the cutter feeding adopts a triangular coal cutting end beveling cutter feeding mode. Design production capacity 8500 t/d.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (7)
1. A method for recovering a pillar type goaf remaining coal pillar by a long wall is characterized by comprising the following steps:
designing components and proportion of the cemented filling body with coal as aggregate according to mine conditions and material characteristics;
establishing a filling station to complete the crushing of coal and the preparation of a cemented filling body;
conveying the cemented filling body to the room and column type goaf through a pipeline to fill the room and column type goaf;
after the cemented filling body is solidified to the designed strength, arranging a longwall mining working face in the room-and-column type goaf full of the cemented filling body;
installing stoping equipment on a longwall mining working face, and longwall mining and recovering the remaining coal pillars of the room-and-pillar type goaf and the cemented filling bodies together;
when the cemented filling body is filled into the room-and-column type goaf, segmented filling is adopted, one section is arranged every 10-20m, a retaining wall is arranged to separate and seal the cemented filling body of each filling section, and the retaining wall is in an air bag, a mold bag or a wood point column form;
each cube of the cemented filling body comprises 1300-1600Kg of coal used as coarse aggregate, 60-100Kg of fly ash used as fine aggregate, 30-50Kg of cementing material, 3.0-6.5Kg of accelerating agent, 1.5-3.5Kg of water reducing agent and 510-660Kg of mine water;
the coal is coal blocks or coal particles with the particle size of less than 24mm after secondary crushing, wherein the particle size of 20mm-24mm accounts for 1% -5%, the particle size of 17.5mm-20mm accounts for 1% -5%, the particle size of 13.5mm-17.5mm accounts for 10% -15%, the particle size of 9mm-13.5mm accounts for 20% -25%, the particle size of 5mm-9mm accounts for 25% -35%, the particle size of 4.3mm-5mm accounts for 10% -15%, the particle size of 0.1mm-4.3mm accounts for 6% -12%, and the particle size of 0.075mm-0.1mm accounts for 2% -6%.
2. The method for longwall recovery of a room and pillar type goaf pillar according to claim 1, characterized in that: the fly ash is second-level or third-level fly ash of a power plant, the cementing material is one or more of 32.5-level or 42.5-level ordinary portland cement, carbide slag and steel slag, and the accelerating agent is prepared from aluminum oxide clinker, sodium carbonate and quick lime according to the mass ratio of 1.1: 1.1: 0.6, the water reducing agent is a lignosulfonate water reducing agent, and the mine water is mine drainage water.
3. The method for longwall recovery of a room and pillar type goaf pillar according to claim 1, characterized in that: the filling station comprises a crushing system, a stirring system, a pumping system and an automatic control system, and is arranged on the ground.
4. The method for longwall recovery of a room and pillar type goaf pillar according to claim 3, characterized in that: and the bottom of a filling drilling hole of the filling station is required to reach the filled room-and-column type goaf coal seam.
5. The method for longwall recovery of a room and pillar type goaf pillar according to claim 1, characterized in that: in order to ensure the roof-contacting effect of the filling area, the filling area adopts a method of embedding a filling pipeline in the top plate.
6. The method for longwall recovery of a room and pillar type goaf pillar according to claim 1, characterized in that: the longwall mining working face is arranged by tunneling the crossheading and the cutting in the room-and-column type goaf full of the cemented filling body after the filling body is solidified to reach the design strength.
7. The method for longwall recovery of a room and pillar type goaf pillar according to claim 1, characterized in that: in the longwall mining, after the longwall mining working face is arranged, equipment comprising a coal mining machine and a hydraulic support is installed, and the coal pillar and the cemented filling body are mined and recovered together in the longwall mining.
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| CN110410076B (en) * | 2019-08-16 | 2021-06-08 | 山东科技大学 | Filling mining method for recovering left coal pillars in goaf of old house pillar |
| CN110714760B (en) * | 2019-11-08 | 2020-11-06 | 河南理工大学 | Mining method for coal-aluminum symbiotic layered induction collaborative mining |
| CN110761792B (en) * | 2019-12-02 | 2023-05-16 | 六盘水师范学院 | Overold cutting device for coal face and application method |
| CN111677506B (en) * | 2020-05-26 | 2022-08-19 | 中煤科工开采研究院有限公司 | Method and device for realizing upward mining and recovering coal pillars in room-and-pillar type goaf |
| CN111828060A (en) * | 2020-07-17 | 2020-10-27 | 神华神东煤炭集团有限责任公司 | Crossheading isolation coal pillar recovery system and recovery method for fully mechanized coal mining face |
| CN112593940A (en) * | 2020-12-16 | 2021-04-02 | 中煤能源研究院有限责任公司 | Arrangement process for remaining coal pillars and processing ground gangue by stope-type coal mining method |
| CN113704863B (en) * | 2021-10-28 | 2022-02-18 | 中煤科工集团西安研究院有限公司 | Method for designing key parameters for controlling filling of room-and-column type goaf |
| CN114165280A (en) * | 2021-11-03 | 2022-03-11 | 李龙清 | Column type goaf filling reconstruction coal seam comprehensive mechanical stoping method |
| CN114687794B (en) * | 2022-03-31 | 2023-11-17 | 中国矿业大学(北京) | Coal mine filling and repeated mining method |
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| CN103527196B (en) * | 2013-10-28 | 2015-07-01 | 中国矿业大学 | Method for recovery of room-type coal pillar through loess filling |
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