CN111088989A - Gob-side entry driving surrounding rock control method for fully mechanized caving section of extra-thick coal seam - Google Patents
Gob-side entry driving surrounding rock control method for fully mechanized caving section of extra-thick coal seam Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000011435 rock Substances 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 41
- 239000010959 steel Substances 0.000 claims abstract description 41
- 229910052751 metal Inorganic materials 0.000 claims abstract description 17
- 239000002184 metal Substances 0.000 claims abstract description 17
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 9
- 239000010432 diamond Substances 0.000 claims abstract description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 10
- 239000011150 reinforced concrete Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 7
- 239000004567 concrete Substances 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 4
- 238000005065 mining Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000005641 tunneling Effects 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 208000008918 voyeurism Diseases 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D17/00—Caps for supporting mine roofs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
-
- 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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- Architecture (AREA)
- Civil Engineering (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention relates to the technical field of coal mining, in particular to a gob-side entry driving surrounding rock control method for a fully mechanized caving section of an extra-thick coal seam; the method comprises the following supporting method and a temporary cavity treatment method; the supporting method comprises the following steps: a. and (4) top plate supporting: adopting a left-handed non-longitudinal-bar threaded steel anchor rod HRB335 with the diameter of 20mm multiplied by 2600mm to be matched with a W-shaped steel belt and paving an 8# metal net; two rows of anchor cables are circulated, the first row of anchor cables is matched with No. 16 channel steel, and the row distance is 1800 mm; the second row of anchor cables is matched with 16 # channel steel and a single anchor cable support combined support with the diameter of 21.8mm multiplied by 8300mm, and the row spacing is 1800 mm; b. and (3) coal side supporting: adopting phi 20mm multiplied by 2600mm left-handed non-longitudinal rib thread anchor rods to match with W-shaped steel belts and 8# diamond metal nets, arranging anchor cables with phi 21.8mm multiplied by 5200mm between two adjacent rows of anchor rods, and arranging the anchor cables in a triple arrangement along the axial direction of a roadway, wherein the row spacing is 900 mm; the invention provides a method for supporting the top plate and two sides of a gob-side roadway of a fully mechanized caving section of an extra-thick coal seam, which is beneficial to controlling the stability of surrounding rocks of the gob-side roadway and ensuring the stability and safety of the roadway; the mining efficiency of the fully mechanized caving area is improved.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a gob-side entry driving surrounding rock control method for a fully mechanized caving section of an extra-thick coal seam.
Background
The gob-side entry driving is a driving way in which a stoping roadway of a lower section drives along the edge of a goaf of an upper section after the goaf of the upper section is collapsed, compacted and stabilized.
Compared with the gob-side entry driving of thin and medium-thickness coal seams, the fully mechanized caving gob-side entry driving has a larger difference. The coal seam thickness of the fully mechanized caving face is thick, the mining height is large, and the top coal is discharged mainly under the action of the dead weight of the top coal and the pressure of the overlying strata on the top coal, so that the top coal is crushed and discharged through the coal discharging port. Therefore, the caving height and the crushing degree of the top plate are much larger and more serious compared with those of thin and medium-thickness coal beds; the stress concentration at the edge of the goaf is higher than that at the edge of the goaf, and the width of each plastic zone of a crushing zone formed at the edge of the goaf is much larger; the rotary subsidence of the coal seam with thinner overlying strata and medium thickness above the coal seam is large; the fully mechanized gob-side entry driving is generally positioned in a broken coal body at the edge of a goaf. Due to the particularity of fully mechanized caving gob-side entry driving in the extra-thick coal seam, the surrounding rock stability principle and the control technology are not mature.
Disclosure of Invention
The invention provides a gob-side entry driving surrounding rock control method for a fully mechanized caving section of an extra-thick coal seam, aiming at solving the technical problems of controlling gob-side entry surrounding rock deformation and ensuring stability and safety of an entry.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a gob-side entry driving surrounding rock control method for a fully mechanized caving section of an extra-thick coal seam comprises the following support method and a temporary cavity treatment method;
the supporting method comprises the following steps: a. and (4) top plate supporting: adopting a left-handed non-longitudinal bar threaded steel anchor rod HRB335 with the diameter of 20mm multiplied by 2600mm, and the spacing row distance of 950mm multiplied by 900 mm; preparing 5100X 250X 3mmW steel belts and paving an 8# metal net; two rows of anchor cables are circulated, wherein the first row adopts 21.8mm phi by 8300mm anchor cables, each row of anchor cables is matched with No. 16 channel steel, and the row distance is 1800 mm; anchor cables with the diameter of 21.8mm multiplied by 8300mm are adopted in the second row, each row of anchor cables is provided with 16-number channel steel and a single anchor cable support with the diameter of 21.8mm multiplied by 8300mm for combined support, and the row spacing is 1800 mm;
b. and (3) coal side supporting: adopting phi 20mm multiplied by 2600mm left-handed non-longitudinal rib thread anchor rods to match 4500 multiplied by 250 multiplied by 3mmW type steel belts and 8# diamond metal nets, arranging row distance between the left-handed non-longitudinal rib thread anchor rods is 1000mm multiplied by 900mm, distance between the upper anchor rods and a top plate is 200mm, distance between the bottom anchor rods and a bottom plate is 500mm, phi 21.8mm multiplied by 5200mm anchor cables are arranged between two adjacent rows of anchor rods, and are arranged in a three-three way mode along the axial direction of a roadway, and the row distance is;
the method for treating the temporary cavern comprises the following steps:
a. installing a monitoring and monitoring system at the position of the adjacent empty chamber, digging a detection hole in advance when the position is tunneled to be 20m away from the adjacent empty chamber, detecting harmful gas in a goaf and preparing for timely hole sealing;
b. when the working face is 5m away from the empty chamber, Marilsan is injected;
c. after a working face passes through an empty chamber influence area, building a reinforced concrete wall immediately, building a reinforced concrete wall on the side of a small coal pillar at a corresponding position of the chamber to reinforce the small coal pillar and isolate a goaf, and adopting an upper anchor rod as a main body and matching an iron wire mesh for reinforcing steel bars; the thickness of the concrete wall is 500 mm.
A gob-side entry driving surrounding rock control method for a fully mechanized caving section of an extra-thick coal seam comprises the following support method and a temporary cavity treatment method;
the supporting method comprises the following steps:
a. and (4) top plate supporting: adopting a left-handed non-longitudinal bar threaded steel anchor rod HRB335 with the diameter of 20mm multiplied by 2600mm, and the spacing row distance of 950mm multiplied by 900 mm; welding a reinforcing steel bar ladder beam by matching phi 14mmQ235 round steel and paving an 8# metal net; anchor cables with the diameter of 21.8mm multiplied by 8250mm are adopted, each row of anchor cables is matched with No. 16 channel steel, and the row distance is 1800 mm; the distance between the anchor cables close to the coal pillar slope and the coal pillar slope is 800mm, the distance between the anchor cables close to the solid coal slope and the coal pillar slope is 1400mm, and the distance between the middle anchor cable and the coal pillar slope is 500mm away from the center line of the roadway;
b. solid coal side supporting: adopting phi 20mm multiplied by 2600mm left-handed non-longitudinal rib thread anchor rods, matching 8# diamond metal mesh, arranging distance between rows of bolts is 1000mm multiplied by 900mm, distance between upper anchor rods and a top plate is 200mm, distance between bottom anchor rods and a bottom plate is 500mm, and each row of anchor rods is connected by a reinforcing steel bar beam welded by phi 12mm Q235 # round steel;
c. and (3) supporting the small coal pillar side: adopting phi 20mm multiplied by 2600mm left-handed non-longitudinal rib thread anchor rods matched with 8# diamond metal mesh, the row spacing is 1000mm multiplied by 900mm, the distance between the upper anchor rods and the top plate is 200mm, the distance between the bottom anchor rods and the bottom plate is 500mm, and each row of anchor rods are connected by a reinforcing steel bar beam welded by phi 12mm Q235 # round steel; anchor cables with the diameter of 21.8mm multiplied by 5250mm are arranged between two adjacent rows of anchor rods and are arranged in a three-flower mode along the axial direction of a roadway, and the row spacing is 900 mm;
the method for treating the temporary cavern comprises the following steps:
a. installing a monitoring and monitoring system at the position of the adjacent empty chamber, digging a detection hole in advance when the position is tunneled to be 20m away from the adjacent empty chamber, detecting harmful gas in a goaf and preparing for timely hole sealing;
b. when the working face is 5m away from the empty chamber, Marilsan is injected;
c. after a working face passes through an empty chamber influence area, building a reinforced concrete wall immediately, building a reinforced concrete wall on the side of a small coal pillar at a corresponding position of the chamber to reinforce the small coal pillar and isolate a goaf, and adopting an upper anchor rod as a main body and matching an iron wire mesh for reinforcing steel bars; the thickness of the concrete wall is 500 mm.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method for supporting the top plate and two sides of a gob-side roadway of a fully mechanized caving section of an extra-thick coal seam, which is beneficial to controlling the stability of surrounding rocks of the gob-side roadway and provides scientific basis for reserving coal pillars of the fully mechanized caving section of the extra-thick coal seam and engineering of the gob-side roadway; the method controls the deformation of surrounding rocks of the gob-side roadway, and ensures the stability and safety of the roadway; the mining efficiency of the fully mechanized caving area is improved.
Detailed Description
The present invention is further illustrated by the following specific examples.
Example 1
In the embodiment, the fairway coal industry of the university and coal mine group company, llc, is taken as an example:
the surrounding rock control early-stage support method comprises the following steps:
and (4) top plate supporting: left-handed non-longitudinal-bar threaded steel anchor rods HRB335 with the diameter of 20mm multiplied by 2600mm are adopted, the spacing between rows is 950mm multiplied by 900mm, and 6 anchor rods are arranged in each row. A5200 mm reinforcing steel bar ladder beam welded by phi 14mmQ235 round steel is matched and a # 8 metal mesh is laid. Anchor cables with the diameter of 21.8mm multiplied by 8250mm are arranged, 5 anchor cables in each row are provided with No. 16 channel steel with the thickness of 5000mm, and the row spacing is 1800 mm; 3600mm of No. 16 channel steel is matched with 3 anchor cables in each row of anchor cables with the diameter of 21.8mm multiplied by 8250mm, the row distance is 1800mm, the distance between the anchor cables close to the coal pillar side and the coal pillar side is 800mm, the distance between the anchor cables close to the solid coal pillar side and the coal pillar side is 1400mm, and the distance between the middle anchor cables and the coal pillar side is 500mm away from the center line of a roadway.
Solid coal side supporting: adopt phi 20mm x 2600mm levogyration to have no longitudinal bar screw thread stock, join in marriage 8# rhombus metal mesh, row spacing 1000mm x 900mm, upper portion stock is apart from roof 200mm, bottom stock is apart from bottom plate 500mm, every row arranges that 4 stock adopts, reinforcing bar ladder roof beam specification: the steel bar beams welded by phi 12mmQ235 round steel are adopted for connection, and the length is 3400 mm.
And (3) supporting the small coal pillar side: the left-handed non-longitudinal-rib threaded anchor rods with the diameter of 20mm multiplied by 2600mm are matched with 8# diamond metal nets, the row spacing is 1000mm multiplied by 900mm, the distance between the upper anchor rods and the top plate is 200mm, the distance between the bottom anchor rods and the bottom plate is 500mm, 4 anchor rods are arranged in each row, the reinforcing steel bar ladder beams are connected through reinforcing steel bar beams welded by phi 12mmQ235 round steel, and the length is 3400 mm. Anchor cables with the diameter of 21.8mm multiplied by 5250mm are arranged between two adjacent rows of anchor rods and are arranged in a three-flower mode along the axial direction of a roadway, and the row spacing is 900 mm.
5211 when the tunnel is excavated to 176m, due to the influence of the coal monitor in the goaf of the adjacent 8210 working face, the tunnel is excavated back, and a series of phenomena of bottom bulging, longitudinal cracking of the top plate and the development of the coal monitor under pressure occur. During the tunneling process of the tunnel, longitudinal cracks of a bottom heave and a top plate extend forwards along with the advancing of a working face, the bottom heave and the top plate crack appear at the position with the mileage of 40-200 m, the average height of the bottom heave is 200mm, the most serious position of the bottom heave is located at the position with the mileage of 125-130 m (meeting the first shunting chamber of 5210 tunnels and a small coal pillar of 3 m), and the bottom heave is 600 mm. The longitudinal crack of the top plate is positioned on the solid coal side, and the crack width is 3-5 mm; in addition, the solid coal side has a moving-close phenomenon, and the average moving-close phenomenon is 200 mm. According to the mine pressure theory, the reason for the close of the solid movement and the cracking of the roof is considered to be that the fracture position of the 8210 working face roof is positioned above the 5211 roadway solid coal side.
In addition, the defects of small top protection area, uneven welding point strength, weak bending strength, small deformation resistance and the like of the steel bar ladder cause the problems of fracture, distortion deformation, damaged welding point of the steel bar ladder and the like of the on-site steel bar ladder.
By the mining electronic drilling peeping instrument, the crack development condition of the surrounding rock in the anchoring range of the anchor rod and the anchor cable can be clearly and visually observed; and comparing the crack distribution and development conditions of the top plate and the two sides of the roadway, establishing a geological structure foundation for supporting the narrow coal pillar along the empty roadway, and being used as a basis for improving the existing supporting scheme to ensure the supporting quality along the empty coal roadway. The lithology and the destruction degree in different depths of the drill holes of the measuring points can be visually obtained by arranging and analyzing the peeping video.
The observation shows that: the top plate crack is located in the range of the anchor cable support control top plate due to the fact that 0.2m of separation phenomenon occurs at 0.6m and 2.7m of the top plate upwards. The small coal pillar side and the solid coal side are broken within 4m, and the side anchor cables are required to be added to control the integrity and stability of the two sides.
Aiming at the problems, the support method is changed according to the actual reinforcement support of the excavated section on site and the support method of the non-excavated section at the later stage.
The later-stage supporting method for the surrounding rock control comprises the following steps:
design of reinforcing support of tunneled section
And (4) top plate supporting: a single anchor cable with the specification of phi 17.8mm multiplied by 8300mm (1 multiplied by 7) is added on the top plate, and the anchor cable channel steel combined structure are arranged in the same row with one beam and three anchors and are 400mm away from the solid coal side.
Solid coal side supporting: anchor cables with the diameter of 21.8mm multiplied by 5200mm (1 multiplied by 19) are added, the row spacing is 900mm multiplied by 900mm, the upper anchor cable is 600mm away from the top plate and inclines upwards for 15 degrees; the bottom anchor cable is 700mm away from the bottom plate and is inclined downwards by 5 degrees; the middle anchor cables are vertically arranged; each row is provided with 3 anchor cables.
And (3) supporting the small coal pillar side: anchor cable reinforcing supports are added on the coal pillar sides, two rows of anchor cables are circulated, wherein the anchor cables with the diameter of 21.8mm multiplied by 5200mm (1 multiplied by 19) are selected for the first row of anchor cable supports, the row spacing is 1800mm, the distance between the upper anchor cables and a top plate is 600mm, and the upper anchor cables are inclined upwards by 15; the bottom anchor cable is 700mm away from the bottom plate and is inclined downwards by 5 degrees; the middle anchor cable is inclined upwards for 15 degrees; each row is provided with 3 anchor cables.
The anchor cables with the diameter of 21.8mm multiplied by 5250mm (1 multiplied by 19) are selected for supporting the anchor cables in the second row, the row distance is 1800mm, the distance between the upper anchor cables and the top plate is 600mm, and the anchor cables are inclined upwards by 15 degrees; the bottom anchor cable is 1200mm away from the bottom plate and is inclined downwards by 15 degrees; the middle anchor cables are vertically arranged; each row is provided with 3 anchor cables.
Non-tunneling section changing support method
And (4) top plate supporting: left-handed non-longitudinal-bar threaded steel anchor rods HRB335 with the diameter of 20mm multiplied by 2600mm are adopted, the spacing between rows is 950mm multiplied by 900mm, and 6 anchor rods are arranged in each row. 5100X 250X 3mmW steel belt is matched and 8# metal mesh is paved. Two rows of anchor cables are circulated, wherein the first row adopts 21.8mm phi by 8300mm anchor cables, 5 anchor cables in each row are matched with 16 # channel steel with the length of 5000mm, and the row spacing is 1800 mm; and the second row adopts 3 anchor cables with the diameter of 21.8mm multiplied by 8300mm in each row to be matched with 16-number channel steel with the diameter of 4000mm and a single anchor cable with the diameter of 21.8mm multiplied by 8300mm to support and support in a combined way, and the row spacing is 1800 mm.
And (3) coal side supporting: the left-handed non-longitudinal-rib threaded anchor rods with the diameter of 20mm multiplied by 2600mm are matched with 4500 multiplied by 250 multiplied by 3mmW type steel belts and 8# diamond metal nets, the interval row spacing is 1000mm multiplied by 900mm, the distance between the upper anchor rods and the top plate is 200mm, the distance between the bottom anchor rods and the bottom plate is 500mm, 4 anchor rods are arranged in each row, anchor cables with the diameter of 21.8mm multiplied by 5200mm are arranged between two adjacent rows of anchor rods and are arranged in a three-row mode along the axial direction of a roadway, and the row spacing is 900.
Method for treating temporary cavern
5210 5 chambers (4 shunting chambers with a depth of 5 m; 1 water sump with a depth of 3 m) are constructed on the left side of the whole roadway in the roadway entry direction, so that the width of the small coal pillars is changed to 3m at the minimum when the 5211 roadway tunneled by the original 8m small coal pillars meets the chambers. The current 5211 lane adopts forward and reverse tunneling and simultaneously tunnels, and the horizontal distances between the chamber of the 5210 lane and the forward and reverse tunneling head of the 5211 lane are 69.5m, 158m and 272.5m from the forward tunneling opening respectively; the distance from the back-digging opening is 124.5m, 325.5 m. In order to ensure safe and efficient tunneling of 5211 lane 3m small coal pillars, preventive measures are taken in advance.
(1) A monitoring and monitoring system is arranged at the position of the 5211 lane near-empty chamber, and when the 5211 lane is tunneled to a position 20m away from the near-empty chamber, a detection hole is drilled in advance, harmful gas in a goaf is detected, and timely hole sealing preparation is made. Through detection by punching detection holes, the goaf has no water and normal gas content, 0.2 of carbon monoxide, 0.63 of carbon dioxide and 0.09 of methane.
(2) And when the working face is 5m away from the empty chamber, injecting Marilyn according to the Marilyn injection scheme. The Marilsan protocol is determined according to the diffusion radius.
(3) And immediately building the reinforced concrete wall after the working face passes through the influence area of the adjacent empty chamber. Building a reinforced concrete wall on the side of the small coal pillar at the corresponding position of the 5210 roadway chamber to reinforce the small coal pillar and isolate the goaf, wherein the reinforcing steel bars adopt side anchor rods as main bodies and are matched with iron wire meshes; the thickness of the concrete wall is 500 mm.
After the series of measures are taken, 5211 roadways are smoothly communicated, the deformation of the roadways is obviously weakened through reinforcement support and support change, the support strength meets the stress and deformation characteristics of surrounding rocks, the current 8211 working face has stable installation conditions, and equipment on the working face is stably installed.
Claims (2)
1. A gob-side entry driving surrounding rock control method for a fully mechanized caving section of an extra-thick coal seam is characterized by comprising the following support method and a temporary cavity treatment method;
the supporting method comprises the following steps: a. and (4) top plate supporting: adopting a left-handed non-longitudinal bar threaded steel anchor rod HRB335 with the diameter of 20mm multiplied by 2600mm, and the spacing row distance of 950mm multiplied by 900 mm; preparing 5100X 250X 3mmW steel belts and paving an 8# metal net; two rows of anchor cables are circulated, wherein the first row adopts 21.8mm phi by 8300mm anchor cables, each row of anchor cables is matched with No. 16 channel steel, and the row distance is 1800 mm; anchor cables with the diameter of 21.8mm multiplied by 8300mm are adopted in the second row, each row of anchor cables is provided with 16-number channel steel and a single anchor cable support with the diameter of 21.8mm multiplied by 8300mm for combined support, and the row spacing is 1800 mm;
b. and (3) coal side supporting: adopting phi 20mm multiplied by 2600mm left-handed non-longitudinal rib thread anchor rods to match 4500 multiplied by 250 multiplied by 3mmW type steel belts and 8# diamond metal nets, arranging row distance between the left-handed non-longitudinal rib thread anchor rods is 1000mm multiplied by 900mm, distance between the upper anchor rods and a top plate is 200mm, distance between the bottom anchor rods and a bottom plate is 500mm, phi 21.8mm multiplied by 5200mm anchor cables are arranged between two adjacent rows of anchor rods, and are arranged in a three-three way mode along the axial direction of a roadway, and the row distance is;
the method for treating the temporary cavern comprises the following steps:
a. installing a monitoring and monitoring system at the position of the adjacent empty chamber, digging a detection hole in advance when the position is tunneled to be 20m away from the adjacent empty chamber, detecting harmful gas in a goaf and preparing for timely hole sealing;
b. when the working face is 5m away from the empty chamber, Marilsan is injected;
c. after a working face passes through an empty chamber influence area, building a reinforced concrete wall immediately, building a reinforced concrete wall on the side of a small coal pillar at a corresponding position of the chamber to reinforce the small coal pillar and isolate a goaf, and adopting an upper anchor rod as a main body and matching an iron wire mesh for reinforcing steel bars; the thickness of the concrete wall is 500 mm.
2. A gob-side entry driving surrounding rock control method for a fully mechanized caving section of an extra-thick coal seam is characterized by comprising the following support method and a temporary cavity treatment method;
the supporting method comprises the following steps:
a. and (4) top plate supporting: adopting a left-handed non-longitudinal bar threaded steel anchor rod HRB335 with the diameter of 20mm multiplied by 2600mm, and the spacing row distance of 950mm multiplied by 900 mm; welding a reinforcing steel bar ladder beam by matching phi 14mmQ235 round steel and paving an 8# metal net; anchor cables with the diameter of 21.8mm multiplied by 8250mm are adopted, each row of anchor cables is matched with No. 16 channel steel, and the row distance is 1800 mm; the distance between the anchor cables close to the coal pillar slope and the coal pillar slope is 800mm, the distance between the anchor cables close to the solid coal slope and the coal pillar slope is 1400mm, and the distance between the middle anchor cable and the coal pillar slope is 500mm away from the center line of the roadway;
b. solid coal side supporting: adopting phi 20mm multiplied by 2600mm left-handed non-longitudinal rib thread anchor rods, matching 8# diamond metal mesh, arranging distance between rows of bolts is 1000mm multiplied by 900mm, distance between upper anchor rods and a top plate is 200mm, distance between bottom anchor rods and a bottom plate is 500mm, and each row of anchor rods is connected by a reinforcing steel bar beam welded by phi 12mm Q235 # round steel;
c. and (3) supporting the small coal pillar side: adopting phi 20mm multiplied by 2600mm left-handed non-longitudinal rib thread anchor rods matched with 8# diamond metal mesh, the row spacing is 1000mm multiplied by 900mm, the distance between the upper anchor rods and the top plate is 200mm, the distance between the bottom anchor rods and the bottom plate is 500mm, and each row of anchor rods are connected by a reinforcing steel bar beam welded by phi 12mm Q235 # round steel; anchor cables with the diameter of 21.8mm multiplied by 5250mm are arranged between two adjacent rows of anchor rods and are arranged in a three-flower mode along the axial direction of a roadway, and the row spacing is 900 mm;
the method for treating the temporary cavern comprises the following steps:
a. installing a monitoring and monitoring system at the position of the adjacent empty chamber, digging a detection hole in advance when the position is tunneled to be 20m away from the adjacent empty chamber, detecting harmful gas in a goaf and preparing for timely hole sealing;
b. when the working face is 5m away from the empty chamber, Marilsan is injected;
c. after a working face passes through an empty chamber influence area, building a reinforced concrete wall immediately, building a reinforced concrete wall on the side of a small coal pillar at a corresponding position of the chamber to reinforce the small coal pillar and isolate a goaf, and adopting an upper anchor rod as a main body and matching an iron wire mesh for reinforcing steel bars; the thickness of the concrete wall is 500 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911270298.7A CN111088989A (en) | 2019-12-12 | 2019-12-12 | Gob-side entry driving surrounding rock control method for fully mechanized caving section of extra-thick coal seam |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911270298.7A CN111088989A (en) | 2019-12-12 | 2019-12-12 | Gob-side entry driving surrounding rock control method for fully mechanized caving section of extra-thick coal seam |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343627A (en) * | 2020-11-03 | 2021-02-09 | 中国平煤神马能源化工集团有限责任公司 | Method for controlling stability of surrounding rock of deep ultra-large section dense chamber group |
| CN112943264A (en) * | 2021-02-19 | 2021-06-11 | 国家能源集团宁夏煤业有限责任公司 | Construction method for fully-mechanized mining face retraction channel |
| CN113503179A (en) * | 2021-08-02 | 2021-10-15 | 太原理工大学 | Method for controlling large-section open-off cut tunneling surrounding rock of overlying goaf ultra-close coal seam |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202064981U (en) * | 2011-05-07 | 2011-12-07 | 山西晋城无烟煤矿业集团有限责任公司 | Soft coal layer roadway supporting structure |
| CN102817620A (en) * | 2012-08-13 | 2012-12-12 | 大同煤矿集团有限责任公司 | Method for supporting ultra-thick and fluffy coal roadway |
| CN103899342A (en) * | 2014-04-15 | 2014-07-02 | 中国矿业大学(北京) | Gob-side entrydriving coal pillar anchor cable through reinforcing method |
| CN204175317U (en) * | 2014-10-22 | 2015-02-25 | 四川广旺能源发展（集团）有限责任公司 | Export supporting under large-inclination-angle coal bed working face to arrange |
| CN104533482A (en) * | 2014-10-28 | 2015-04-22 | 淮浙煤电有限责任公司顾北煤矿分公司 | Reinforcing method for improving stability of gob-side entry driving small coal pillar |
| CN105370299A (en) * | 2015-11-27 | 2016-03-02 | 山东新巨龙能源有限责任公司 | Kilometers-deep thick coal seam narrow coal pillar gob-side entry supporting process |
| CN205936636U (en) * | 2016-08-19 | 2017-02-08 | 淮南矿业(集团)有限责任公司 | High seam tunnels support system along sky |
| CN206636603U (en) * | 2017-04-07 | 2017-11-14 | 兖州煤业股份有限公司 | Face sky old working compound closure wall |
| CN109441503A (en) * | 2018-11-19 | 2019-03-08 | 中国矿业大学(北京) | A kind of method for protecting support that thin coal pillar is controlled along empty coal road mine pressure inversion |
-
2019
- 2019-12-12 CN CN201911270298.7A patent/CN111088989A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202064981U (en) * | 2011-05-07 | 2011-12-07 | 山西晋城无烟煤矿业集团有限责任公司 | Soft coal layer roadway supporting structure |
| CN102817620A (en) * | 2012-08-13 | 2012-12-12 | 大同煤矿集团有限责任公司 | Method for supporting ultra-thick and fluffy coal roadway |
| CN103899342A (en) * | 2014-04-15 | 2014-07-02 | 中国矿业大学(北京) | Gob-side entrydriving coal pillar anchor cable through reinforcing method |
| CN204175317U (en) * | 2014-10-22 | 2015-02-25 | 四川广旺能源发展（集团）有限责任公司 | Export supporting under large-inclination-angle coal bed working face to arrange |
| CN104533482A (en) * | 2014-10-28 | 2015-04-22 | 淮浙煤电有限责任公司顾北煤矿分公司 | Reinforcing method for improving stability of gob-side entry driving small coal pillar |
| CN105370299A (en) * | 2015-11-27 | 2016-03-02 | 山东新巨龙能源有限责任公司 | Kilometers-deep thick coal seam narrow coal pillar gob-side entry supporting process |
| CN205936636U (en) * | 2016-08-19 | 2017-02-08 | 淮南矿业(集团)有限责任公司 | High seam tunnels support system along sky |
| CN206636603U (en) * | 2017-04-07 | 2017-11-14 | 兖州煤业股份有限公司 | Face sky old working compound closure wall |
| CN109441503A (en) * | 2018-11-19 | 2019-03-08 | 中国矿业大学(北京) | A kind of method for protecting support that thin coal pillar is controlled along empty coal road mine pressure inversion |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343627A (en) * | 2020-11-03 | 2021-02-09 | 中国平煤神马能源化工集团有限责任公司 | Method for controlling stability of surrounding rock of deep ultra-large section dense chamber group |
| CN112943264A (en) * | 2021-02-19 | 2021-06-11 | 国家能源集团宁夏煤业有限责任公司 | Construction method for fully-mechanized mining face retraction channel |
| CN113503179A (en) * | 2021-08-02 | 2021-10-15 | 太原理工大学 | Method for controlling large-section open-off cut tunneling surrounding rock of overlying goaf ultra-close coal seam |
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