CN110939464A - Gob-side entry retaining combined supporting method for adjacent working faces - Google Patents
Gob-side entry retaining combined supporting method for adjacent working faces Download PDFInfo
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- CN110939464A CN110939464A CN201911195730.0A CN201911195730A CN110939464A CN 110939464 A CN110939464 A CN 110939464A CN 201911195730 A CN201911195730 A CN 201911195730A CN 110939464 A CN110939464 A CN 110939464A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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
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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
- E21D15/02—Non-telescopic props
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
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- Mining & Mineral Resources (AREA)
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Abstract
A gob-side entry retaining combined supporting method for adjacent working faces is characterized in that in the stoping of the working face above the adjacent working face, the adjacent area of a goaf of the upper working face is determined as a lag area; a strong pier stud is erected in the lag zone, and a gob-side roadway which can be used for mining on the lower working face is formed on one side of a gob area on the upper working face; in the lower working face stoping process of the adjacent working face, determining the adjacent area of the goaf of the lower working face as a lag area; through dismantling, transporting and re-erecting operation, strong pier columns erected in adjacent lag areas of the upper working face goaf are continuously transferred into the lag areas of the lower working face goaf, and a gob-side roadway which can be used for mining the lower working face is formed on one side of the lower working face goaf. The invention can effectively reduce the mine pressure intensity of the gob-side entry retaining of the working face below, reduce the supporting difficulty and supporting cost and make the labor organization more convenient.
Description
Technical Field
The invention relates to a gob-side entry retaining combined supporting method for adjacent working faces.
Background
In the deep and to the exploitation of thick coal seam in colliery, because the tunnel bears strong dynamic pressure, and require to use a large amount of monomer pillars, just can reach and strut the effect, nevertheless because monomer pillar itself has the technological consideration of letting down the pressure, therefore, monomer pillar often has great deformation, thereby also make roof or coal-pushing have great deformation, this not only makes the monomer pillar can't retrieve, more make the roof of gob entry one side after the face exploitation, also can not in time collapse, make face goaf top still have obvious mine pressure phenomenon, and transmit the adjacent working face in below, make the adjacent working face in below more difficult when strutting in the tunnel, need put into more monomer pillars, the increase of monomer pillar must also influence the use in tunnel. Therefore, the existing gob-side entry retaining support method needs to be improved.
Disclosure of Invention
In order to solve the problems, the invention provides a gob-side entry retaining combined supporting method for adjacent working faces.
A gob-side entry retaining combined supporting method for adjacent working faces is characterized in that in the process of mining the upper working face of the adjacent working face, an adjacent area of a goaf of the upper working face is determined as a lagging area, and an area in front of the working face is determined as an advancing area; in the lagging area, performing gob-side entry retaining operation on one side adjacent to the lower working face, separating the goaf of the upper working face from the lagging area by adopting a roof cutting gangue blocking pillar and a guniting closed net, vertically arranging a strong pier stud in the lagging area, forming a gob-side roadway which can be used for mining the lower working face on one side of the goaf of the upper working face by supporting an upper top plate through the strong pier stud, in the roadway of the advancing area, the roadway top plate adopts a support mode of combining a monomer pillar and a pi-shaped beam, the advancing area is continuously changed into the lagging area along with continuous advancing of the upper working face, and the support mode of combining the monomer pillar and the pi-shaped column is continuously replaced by the strong pier stud on one side adjacent to the lower working face; the lower working face and the upper working face of the adjacent working faces start to recover after recovery or in the recovery process; in the lower working face stoping process of the adjacent working face, determining the adjacent area of the goaf of the lower working face as a lagging area, and determining the area in front of the working face as a leading area; in the lag area, performing gob-side entry retaining operation on one side adjacent to the lower working face, and isolating the goaf of the lower working face from the lag area by adopting a roof cutting gangue blocking pillar and a guniting closed net; through dismantling, transporting and re-erecting operation, strong pier columns erected in adjacent lag areas of the upper working face goaf are continuously transferred into the lag areas of the lower working face goaf, and the strong pier columns form a gob-side roadway which can be used for mining the lower working face on one side of the gob-side of the lower working face through supporting the upper top plate.
In the gob-side entry retaining combined supporting method for the adjacent working faces, the powerful pier stud is a combination of more than one prefabricated concrete cylinder, the prefabricated concrete cylinders are formed on the ground, the prefabricated concrete cylinders are transported to the underground from the ground during initial use, and when the powerful pier stud is erected, high-water materials are poured between the prefabricated concrete cylinders and the top plate to realize top pressing under pressure.
In the gob-side entry retaining combined supporting method for the adjacent working faces, all precast concrete columns of the strong pier are combined through mortise and tenon structures.
In the gob-side entry retaining combined supporting method for the adjacent working faces, a top-cutting anchor cable is also arranged in a top plate area above the top-cutting gangue-blocking strut and the guniting closed net.
In the gob-side entry retaining combined supporting method for the adjacent working faces, the ranges of a lagging area and a leading area are further determined through field mine pressure monitoring, and stress concentration coefficients in the lagging area and the leading area are both greater than 1.
In the gob-side entry retaining combined supporting method for the adjacent working faces, the transportation and the erection of the powerful pier stud are realized in a hoisting mode by a manipulator or a winch.
In the gob-side entry retaining combined supporting method for the adjacent working faces, the number of the powerful pier studs is determined by the pressure intensity of the top plate of the working face.
Compared with the prior art, the invention has the following technical advantages:
(1) the strong pier stud can provide enough supporting strength, is small in deformation allowed by the strong pier stud, and is supported by the top pressed by the belt, so that the strong pier stud can be easily moved to the lower working surface for gob-side entry retaining operation by removing the top pressed part of high-water materials after the recovery of the strong pier stud on the upper working surface.
(2) According to the invention, by removing the powerful pier stud in the gob-side entry retaining of the upper working face in time and the action of the top-cutting baffle strut and the top-cutting anchor cable, after the upper working face is recovered, a large area of suspended roof cannot be reserved in a goaf, so that the mine pressure display of gob-side entry retaining operation of the lower working face is weakened, and therefore, the supporting strength and the cost input of the gob-side entry retaining of the lower working face are effectively reduced.
(3) The invention realizes the connection of gob-side entry retaining operation of the adjacent working faces by repeatedly using the powerful pier stud for two times, even three times and four times of the adjacent working faces, so the invention can effectively reduce the input of gob-side entry retaining support.
(4) The invention is constructed by the same process, so the invention is more convenient for the coordination of labor organization.
Drawings
In order that the summary of the invention may be more readily understood, the invention will now be further described with reference to the accompanying drawings and examples.
FIG. 1 is a schematic plan view of a gob-side entry retaining support of a working face above the gob-side entry retaining combined support method of adjacent working faces according to the present invention;
FIG. 2 is a schematic plan view of the gob-side entry retaining support of the working face below the gob-side entry retaining combined support method of the adjacent working faces of the invention.
Labeled as: 1-upper working face goaf, 2-roof cutting and gangue stopping pillars, 3-slurry spraying closed nets, 4-roof cutting anchor cables, 5-strong pier studs, 6-single pillars, 7-pi-shaped beams, 8-lag areas, 9-lead areas and 10-lower working face goaf.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 and 2 show a preferred embodiment of the gob-side entry retaining combined supporting method for adjacent working faces of the invention.
According to the gob-side entry retaining combined supporting method for the adjacent working faces, in the process of extracting the upper working face of the adjacent working face, the area adjacent to the goaf 1 of the upper working face is determined as a lagging area 8, and the area in front of the working face is determined as an advancing area 9;
in the lag region 8, performing gob-side entry retaining operation on one side adjacent to a lower working face, separating an upper working face gob area 1 from the lag region 8 by adopting a roof cutting gangue-blocking pillar 2 and a guniting closed net 3, vertically arranging a strong pier stud 5 in the lag region 8, forming a gob-side roadway which can be used for mining the lower working face on one side of the gob area 1 along the upper working face by the strong pier stud 5 through supporting an upper top plate, in a roadway of an advance region 9, adopting a supporting mode of combining a monomer pillar 6 and a pi-shaped beam on the roadway top plate, continuously changing the advance region 9 into the lag region 8 along with continuous propulsion of the upper working face, and continuously replacing the supporting mode of combining the monomer pillar 6 and the pi-shaped column by the strong pier stud 5 on one side adjacent to the lower working face;
the lower working face and the upper working face of the adjacent working faces start to recover after recovery or in the recovery process;
in the lower working face stoping process of the adjacent working faces, determining the adjacent area of the lower working face gob area 10 as a lag area 8, and determining the area in front of the working faces as an advance area 9;
in the lag area 8, performing gob-side entry retaining operation on one side adjacent to the lower working face, and isolating the lower working face goaf 10 from the lag area 8 by adopting a roof cutting gangue stopping pillar 2 and a guniting closed net 3;
through dismantling, transporting and re-erecting operation, the strong pier stud 5 erected in the adjacent lag area 8 of the upper working face gob 1 is continuously transferred into the lag area 8 of the lower working face gob 10, and the strong pier stud 5 forms a gob-side roadway which can be used for mining the lower working face on one side of the lower working face gob 10 through supporting an upper top plate.
In this embodiment, powerful pier stud 5 is the assembly of more than one precast concrete cylinder, and the precast concrete cylinder forms on ground, transports to the pit from ground when first use, when setting up powerful pier stud 5 immediately, realizes pressing the top through pouring high water material between precast concrete cylinder and roof with the area.
In this embodiment, the prefabricated concrete columns of the strong pier 5 are combined through mortise and tenon structures.
In the embodiment, a top-cutting anchor rope 4 is also arranged in the top plate area above the top-cutting gangue stopping prop 2 and the guniting closed net 3.
In the present embodiment, the extent of the lag zone 8 and lead zone 9 is further determined by in-situ mine pressure monitoring, and the stress concentration factor is greater than 1 in both the lag zone 8 and lead zone 9.
In the embodiment, the powerful pier 5 is transported and erected by means of hoisting by a manipulator or a winch.
In this embodiment, the number of power pillars 5 is determined by the working face top plate pressing strength.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.
Claims (7)
1. A gob-side entry retaining combined supporting method for adjacent working faces is characterized in that:
in the stoping of the upper working face of the adjacent working face, the adjacent area of the goaf (1) of the upper working face is determined as a lag area (8), and the area in front of the working face is determined as a lead area (9);
performing a gob-side entry retaining work in the lag zone (8) on a side adjacent to the lower working face, the goaf (1) on the upper working face is isolated from the lag area (8) by adopting a roof-cutting gangue-blocking pillar (2) and a guniting closed net (3), a strong pier stud (5) is vertically arranged in the lag area (8), the strong pier stud (5) supports an upper top plate, a gob-side roadway which can be used for mining on the lower working face is formed on one side of the gob (1) on the upper working face, in the roadway of the advance area (9), the roadway top plate adopts a supporting mode of combining a single support column (6) and a pi-shaped beam, the advance area (9) is continuously changed into a lag area (8) along with the continuous advancing of the upper working surface, on one side adjacent to the lower working surface, the single support column (6) and the Pi-shaped column combined supporting mode are continuously replaced by a strong pier column (5);
the lower working face and the upper working face of the adjacent working faces start to recover after recovery or in the recovery process;
in the lower working face stoping process of the adjacent working faces, the adjacent area of the goaf (10) of the lower working face is determined as a lag area (8), and the area in front of the working face is determined as an advance area (9);
in the lag area (8), performing gob-side entry retaining operation on one side adjacent to the lower working face, and isolating the lower working face goaf (10) from the lag area (8) by adopting a roof cutting gangue blocking pillar (2) and a guniting closed net (3);
through dismantling, transporting and re-erecting operation, strong pier columns (5) erected in the adjacent lag area (8) of the upper working face goaf (1) are continuously transferred into the lag area (8) of the lower working face goaf (10), and the strong pier columns (5) support an upper top plate to form a gob-side roadway which can be used for mining the lower working face on one side of the lower working face goaf (10).
2. The adjacent working face gob-side entry retaining combined supporting method according to claim 1, characterized in that: powerful pier stud (5) are the assembly of more than one precast concrete cylinder, and the precast concrete cylinder forms on ground, transports in the pit from ground when first use, when establishing powerful pier stud (5) immediately, realizes pressing the top through pouring high water material between precast concrete cylinder and roof.
3. The adjacent working face gob-side entry retaining combined supporting method according to claim 2, characterized in that: and the prefabricated concrete columns of the strong pier column (5) are combined through mortise and tenon structures.
4. A combined gob-side entry retaining support method for adjacent working faces according to any one of claims 1 to 3, wherein: and a top-cutting anchor cable (4) is also arranged in the top plate area above the top-cutting gangue-blocking strut (2) and the guniting closed net (3).
5. The adjacent working face gob-side entry retaining combined supporting method according to any one of claims 1 to 4, characterized in that: the range of the lag area (8) and the lead area (9) is further determined through field mine pressure monitoring, and the stress concentration coefficient in the lag area (8) and the lead area (9) is larger than 1.
6. The adjacent working face gob-side entry retaining combined supporting method according to any one of claims 1 to 5, characterized in that: the strong pier column (5) is transported and erected in a hoisting mode through a manipulator or a winch.
7. The adjacent working face gob-side entry retaining combined supporting method according to any one of claims 1 to 6, characterized by comprising: the number of the strong pier studs (5) is determined by the pressure intensity of the working face top plate.
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| CN201911195730.0A CN110939464B (en) | 2019-11-29 | 2019-11-29 | Gob-side entry retaining combined supporting method for adjacent working faces |
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| CN201911195730.0A CN110939464B (en) | 2019-11-29 | 2019-11-29 | Gob-side entry retaining combined supporting method for adjacent working faces |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111734466A (en) * | 2020-06-29 | 2020-10-02 | 陕西煤业化工技术研究院有限责任公司 | Gob-side entry retaining roadway support system and method for three-soft coal seam coal pillar-free mining |
| CN111963197A (en) * | 2020-08-28 | 2020-11-20 | 陕西煤业化工技术研究院有限责任公司 | Gob-side entry retaining roadway supporting method for three-soft coal seam coal pillar-free mining |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111734466A (en) * | 2020-06-29 | 2020-10-02 | 陕西煤业化工技术研究院有限责任公司 | Gob-side entry retaining roadway support system and method for three-soft coal seam coal pillar-free mining |
| CN111734466B (en) * | 2020-06-29 | 2022-03-18 | 陕西煤业化工技术研究院有限责任公司 | Gob-side entry retaining roadway support system and method for three-soft coal seam coal pillar-free mining |
| CN111963197A (en) * | 2020-08-28 | 2020-11-20 | 陕西煤业化工技术研究院有限责任公司 | Gob-side entry retaining roadway supporting method for three-soft coal seam coal pillar-free mining |
| CN111963197B (en) * | 2020-08-28 | 2023-02-21 | 陕西煤业化工技术研究院有限责任公司 | Gob-side entry retaining roadway supporting method for three-soft coal seam coal pillar-free mining |
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