CN110925017A - Reserving and supporting method for long-wall mining special-shaped gob-side roadway in large-dip-angle medium-thickness coal seam trend - Google Patents
Reserving and supporting method for long-wall mining special-shaped gob-side roadway in large-dip-angle medium-thickness coal seam trend Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000005065 mining Methods 0.000 title claims abstract description 25
- 230000000903 blocking effect Effects 0.000 claims description 22
- 238000004873 anchoring Methods 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 14
- 239000011435 rock Substances 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 230000000717 retained effect Effects 0.000 claims description 5
- 230000002708 enhancing effect Effects 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 15
- 239000010878 waste rock Substances 0.000 description 12
- 239000011425 bamboo Substances 0.000 description 8
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 7
- 235000017491 Bambusa tulda Nutrition 0.000 description 7
- 241001330002 Bambuseae Species 0.000 description 7
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 7
- 239000002699 waste material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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- 238000007569 slipcasting Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/02—Supporting means, e.g. shuttering, for filling-up materials
- E21F15/04—Stowing mats; Goaf wire netting; Partition walls
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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
- E21D20/02—Setting anchoring-bolts with provisions for grouting
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Abstract
The invention provides a reserving and supporting method for a large-dip-angle medium-thickness coal seam strike long-wall mining special-shaped gob roadway; the method comprises the following steps: the method comprises the following steps: reserving a large-dip-angle medium-thickness coal seam along a hollow roadway; step two: the flexible mold concrete and the flexible cushion layer are strongly and weakly combined with the roadside filling support; step three: and (4) supporting in a rigid-flexible combined roadway of the single prop and the full anchor system. The method for reserving and supporting the large-dip-angle medium-thickness coal seam strike long-wall mining special-shaped gob-side entry provided by the invention can solve the problem of stability of the large-dip-angle medium-thickness coal seam gob-side entry, improves the recovery rate of coal, reduces the labor intensity of workers and greatly improves the construction safety.
Description
Technical Field
The invention relates to the field of coal mining and roadway support; in particular to a reserving and supporting method for a large dip angle medium thickness coal seam strike long wall mining special-shaped gob-side roadway.
Background
With the implementation of the sustainable development strategy of coal resource mining in China, gob-side entry retaining is successfully applied as an effective coal pillar-free mining technology under the conditions of nearly horizontal, slowly inclined, thin and medium-thick coal seams and good top and bottom plate conditions. The roadway retaining mode comprises in-situ roadway retaining and semi-in-situ roadway retaining, the supporting mode comprises in-roadway supporting and roadside supporting, the in-roadway supporting mainly adopts anchor rods, anchor nets and the like to reinforce and support so as to improve the stability of surrounding rock, and the roadside supporting mainly adopts small coal pillars, roadside filling, support pillars and the like to effectively control the movement settlement of roof strata. The gob-side entry retaining technology can relieve coal pillar retaining loss of a coal mine section, improve coal extraction rate, reduce roadway excavation amount, relieve the situation of continuous tension of excavation, and is beneficial to safe, efficient and green mining of mines.
In the mining of a large-inclination-angle coal seam, due to the fact that the inclination angle is large, the conditions of the top and the bottom of the coal seam are complex, the caving of the top plate and the inclination of a gangue filling edge have nonlinear characteristics, the surrounding rock stress environment of a transportation roadway at the lower part of a working face is complex, and the retaining and supporting difficulty of a gob-side roadway is large. According to the migration rule of the long-wall mining overburden rock along the trend of the large-dip-angle coal seam, a reasonable gob-side roadway setting method, an in-roadway rigid-flexible support and a roadside strong and weak filling support technology are determined, the compression effect of the working face top plate sinking on the gob-side roadway and the impact effect of caving waste rocks are effectively relieved, the problems of gob-side roadway surrounding rock breakage, coal wall caving and the like are solved, and a new method is provided for realizing coal pillar-free mining of the large-dip-angle medium-thickness coal seam.
Disclosure of Invention
The invention aims to provide a reserving and supporting method for a large-dip-angle medium-thickness coal seam strike long-wall mining special-shaped gob roadway.
In a first aspect, the invention is realized by the following technical scheme:
the invention relates to a reserving and supporting method for a large-dip-angle medium-thickness coal seam strike long-wall mining special-shaped gob roadway, which comprises the following steps:
the method comprises the following steps: reserving a large-dip-angle medium-thickness coal seam along a hollow roadway;
step two: the flexible mold concrete and the flexible cushion layer are strongly and weakly combined with the roadside filling support;
step three: and (4) supporting in a rigid-flexible combined roadway of the single prop and the full anchor system.
Preferably, in the step one, the specific steps are as follows:
and 2, generating O-X fracture after the top plate is initially collapsed, carrying out roof cutting and pressure relief at the position of an arc-shaped triangular plate at the lower port of the working face, collapsing the top plate of the working face along the edge of the transport roadway, retaining the transport roadway, and reserving the roadway to the position of a withdrawing channel of the working face at the lower section. The retained tunnel is used as a return air tunnel of the lower section working face.
Preferably, in the second step, the specific steps are as follows:
Preferably, the third step comprises the following specific steps:
Preferably, in the step 2, the top plate is broken by O-X after the top plate is initially collapsed, and the arc-shaped triangular plate at the lower port of the working face is subjected to roof cutting and pressure relief, so that the peak value of the asymmetric stress arch formed in the top plate is deviated to the middle of the working face, the movement of an overlying strata is slowed down, and the deformation of gob-side entry retaining surrounding rock is reduced.
Preferably, in the step 1, in the metal mesh, anchor rods are respectively driven into the top and bottom plates of the goaf to fix the metal mesh for waste rock blocking.
Preferably, in the step 1, the supports for retaining the waste rock are arranged in two rows into a group, each row is provided with 3 supports, the supports are connected with the working face support for moving, the goaf can be temporarily supported and isolated, and a large-inclination-angle anti-skid device is matched; when the working surface is pushed forwards, bamboo fences are filled behind the supports after the gangue stopping supports are moved, and gangue leakage is prevented.
Preferably, in step 1, a grouting opening is formed in the flexible mold concrete wall and connected with a concrete conveying pipe, the mixed concrete is pumped into the flexible mold through the conveying pipe, and the concrete is automatically molded in the flexible mold by utilizing the characteristic that the flexible mold is permeable to water and impermeable to the concrete.
Preferably, the dip angle of the coal seam of the medium-thickness coal seam with the large dip angle is 35-55 degrees, and the thickness of the coal seam is 2-3 m.
The method of the invention has the following advantages:
(1) the roadside support adopts a method of combining soft mold concrete and a flexible cushion layer, the flexible cushion layer enhances the deformability of the roadside support, and the sedimentation rate of a roof rock layer is slowed down; the side is pour in the tunnel group to gentle mould concrete wall to draw the wall body basis to hard end, when the bottom plate receives water to corrode and leads to the bottom plate soft, avoid the condition that the wall body probably appears collapsing.
(2) According to the invention, the bamboo basketry is filled behind the support after the gangue-blocking support is moved, a flexible protective layer is added to the roadside filling body, and the impact force of flying gangue on the roadside filling body is reduced.
(3) The invention carries out roof cutting and pressure relief on the roof, so that the peak value of the stress arch deviates to the middle of the working face, and the deformation of surrounding rock along the gob-side entry retaining is reduced.
(4) The invention cancels the traditional wood point column and adopts the waste rock blocking bracket, thereby improving the gob-side entry retaining speed and the mechanization degree and simultaneously improving the safety factor of the waste rock blocking support of the gob-side entry retaining.
(5) The roadway internal support adopts a rigid-flexible combination method of a single prop and a full anchor system, and has the advantages of stable support, simple implementation, safety and reliability.
Drawings
FIG. 1 is a schematic plan view of a gob-side entry retaining arrangement of a high-dip-angle medium-thickness coal seam according to the present invention;
FIG. 2 is a cross-sectional view of a gob-side entry retaining support arrangement (I-I) of a high dip angle medium thickness coal seam in accordance with the present invention;
FIG. 3 is a plan view of a structure of a gob-side entry retaining roadside support flexible mold wall of a large-dip-angle medium-thickness coal seam according to the invention;
FIG. 4 is a sectional view of a structure of a gob-side entry retaining roadside support flexible mold wall of a large-dip-angle medium-thickness coal seam according to the invention;
fig. 5 is a plan view of the gob-side entry retaining support arrangement of the high-dip-angle medium-thickness coal seam according to the invention.
Wherein: 1-present section working face; 2-lower section stoping face; 3-working face return airway; 4-working face hydraulic support; 5-a goaf; 6-cutting a top line; 7-flexible mold concrete wall; 8-a waste rock blocking bracket; 9-bamboo basketry; 10-working face haulage roadway; 11-face end support; 12-gob-side entry retaining; 13-coal seam; 14-immediate roof; 15-basic top; 16-anchor rod; 17-anchor cable; 18-stress arch curve after topping; 19-stress arch curve before topping; 20-a meter protection device; 21-a monolithic pillar; 22-anchor bolt; 23-a flexible cushion layer; 24-a metal mesh; 25-collapse of gangue; 26-a grouting port; 27-W steel strip; 28-wire netting; d-roof "O-X" shaped rupture (rupture sequence: a, b, c).
Detailed Description
The present invention will be described in detail with reference to specific examples. It should be noted that the following examples are only illustrative of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
The method for reserving and supporting the long-wall mining special-shaped gob side roadway in the trend of the large-dip-angle medium-thickness coal seam provided by the embodiment; as shown in fig. 1, 2, 3, 4 and 5, the thickness of the coal seam is 2m-3m, and the dip angle of the coal seam is 35-55 degrees.
The method comprises the following steps: and reserving the large-dip-angle medium-thickness coal seam along the empty roadway. As shown in fig. 1, includes: the method comprises the following steps of (1) a working face of a current section, a lower section stoping working face 2, a working face return airway 3, a working face hydraulic support 4, a goaf 5, a roof cutting line 6, a flexible mold concrete wall 7, a waste rock blocking support 8, a bamboo fence 9, a working face transportation airway 10, a working face end support 11, a gob-side entry retaining 12 and a roof O-X-shaped fracture D; shown in fig. 2, includes: the method comprises the following steps of (1) cutting a top line 6, a flexible mould concrete wall 7, a waste rock blocking bracket 8, a bamboo basketry 9, a gob-side entry retaining 12, a coal seam 13, a direct roof 14, a basic roof 15, an anchor rod 16, an anchor cable 17, a post-cutting stress arch curve 18, a pre-cutting stress arch curve 19, a meter protection device 20, a single pillar 21, an anchor bolt 22, a flexible cushion layer 23, a metal mesh 24 and collapse waste rocks 25; before the working surface 1 of the first section is pushed from the hole cutting to the primary collapse of the top plate, a gangue blocking support 8 is placed in a to-be-filled area of a roadway at the lower port of the working surface to prevent gangue, and a metal mesh 24 is laid to block gangue; the method comprises the steps that an O-X fracture is generated after a top plate is collapsed for the first time, an arc-shaped triangular plate at a lower port of a working face is subjected to roof cutting and pressure relief, the top plate of the working face is collapsed along the edge of a transport roadway 10, a strong (flexible mold concrete) and weak (flexible cushion) combined filling support body is arranged at the edge of a goaf 5 in the transport roadway, the transport roadway 10 of the working face is retained, and the roadway is retained to a withdrawal channel of a lower section working face 2. The retained roadway is used as the return air roadway of the lower section working face 2.
Step two: strong (soft mold concrete) and weak (flexible cushion) roadside filling support; as shown in fig. 2, includes: the method comprises the following steps of (1) cutting a top line 6, a flexible mould concrete wall 7, a waste rock blocking bracket 8, a bamboo basketry 9, a gob-side entry retaining 12, a coal seam 13, a direct roof 14, a basic roof 15, an anchor rod 16, an anchor cable 17, a post-cutting stress arch curve 18, a pre-cutting stress arch curve 19, a meter protection device 20, a single pillar 21, an anchor bolt 22, a flexible cushion layer 23, a metal mesh 24 and collapse waste rocks 25; shown in fig. 3, comprising: anchor bolt 22, grouting port 26; as shown in fig. 4, includes: the anchor bolt 22, the grouting opening 26 and the roadside support of the working face air-return gallery 3 of the invention adopt a flexible mold concrete wall 7 (strong) and a flexible cushion layer 23 (weak) for common support. The soft mold concrete wall 7 is positioned at the lower part of the roadside filling body and poured on the side of the upper, and in order to prevent the wall body from sliding, the wall body foundation is dug to a hard bottom so as to increase the strength and the skid resistance of the wall. Referring to fig. 3 (22-anchor bolt, 26-grouting opening), and fig. 4 (22-anchor bolt, 26-grouting opening), the length h3 of the flexible concrete wall 7 is h4 is 3m, the designed concrete strength is C25, the initial wall thickness h6 is 0.8m, and the wall height h5 is 4 m. Wherein, the height of the wall body is adjusted along with the change of the inclination angle of the top plate. In order to control the lateral deformation of the flexible mold wall body 7 and enhance the compression strength of the flexible mold wall body 7, anchor bolts 22 are arranged on the flexible mold, the specification is phi 20mm multiplied by 1100mm, the pitch is h1 multiplied by h2 which is 1.0m multiplied by 1.0m, the anchor bolts 22 are made of anchor rods, the two ends of each anchor bolt are rolled with threads, and a tray and a nut are respectively matched at the two ends of each anchor bolt. The flexible cushion layer 23 is positioned at the upper part of the roadside packing body, and in the embodiment, the wedge-shaped wood cushion layer is selected as the flexible cushion layer 23, and the height of the flexible cushion layer changes along with the change of the inclination angle of the top plate, so that the deformability of the roadside packing body is enhanced.
Step three: and (3) supporting in a rigid (single prop) flexible (full anchor system) roadway. As shown in fig. 2, the method comprises the following steps: the method comprises the following steps of (1) cutting a top line 6, a flexible mould concrete wall 7, a waste rock blocking bracket 8, a bamboo basketry 9, a gob-side entry retaining 12, a coal seam 13, a direct roof 14, a basic roof 15, an anchor rod 16, an anchor cable 17, a post-cutting stress arch curve 18, a pre-cutting stress arch curve 19, a meter protection device 20, a single pillar 21, an anchor bolt 22, a flexible cushion layer 23, a metal mesh 24 and collapse waste rocks 25; FIG. 5 shows: the method comprises the following steps: anchor rods 16, anchor cables 17, W steel belts 27 and wire netting 28; the gob-side roadway is supported by a full anchor system (flexible) and a single support column (rigid). In the full-anchor system, an anchor rod 16 and an anchor cable 17 are vertically driven into the full-anchor system along a roadway roof, in the embodiment, the anchor rod 16 is a phi 20mm multiplied by 2200mm high-strength threaded anchor rod 16, the slurry strength of an anchoring agent is not lower than 20.0MPa, three-speed anchoring cartridges, namely a fast anchoring cartridge, a medium-speed anchoring cartridge and a slow anchoring cartridge, are matched for use during operation, the pretightening force is rapidly applied after the fast anchoring agent takes effect, and the row spacing between the anchor rods 16 is 800 mm; the anchor cable 17 adopts the specification of phi 15.24mm multiplied by 5000mm, the slurry strength of the anchoring agent is similar to that of the anchor rod, and the spacing is 1600mm multiplied by 3200 mm; the roadway meter protecting device 20 adopts an anchor net system and an anchor rod 16 to fix a W steel belt 27 for protecting the meter, the anchor net adopts a wire mesh 28 with the aperture of 50mm, and the row spacing of the W steel belt 27 in the anchor rod 16 is kept consistent when the W steel belt 27 runs towards the support density. The single pillars 21 in the roadway play an auxiliary role in supporting the full anchor, and the roadway is supported by placing one pillar every 2m, so that the failure of the full anchor system is prevented, and the stability of the roadway is maintained.
In this embodiment, the roof is broken by "O-X" after the roof is initially collapsed in the first step, and roof cutting and pressure relief are performed at the position of the arc-shaped triangular plate at the lower port of the working face, so that the peak value of the asymmetric stress arch 19 formed in the roof before roof cutting can be shifted to the middle of the working face, thereby slowing down the movement of the overlying strata and reducing the deformation of the gob-side entry retaining surrounding rock.
In this embodiment, the anchor rods 16 are respectively driven into the metal mesh 24 in the first step at the top and bottom of the gob, and the upper and lower edges of the metal mesh 24 are respectively hung at the tails of the upper and lower anchor rods 16 to fix the metal mesh 24, so as to block the gangue. The waste rock blocking supports 8 are arranged in two rows to form a group, each row is provided with 3 waste rock blocking plates, the waste rock blocking plates are connected with the working face support to move the support, the goaf can be temporarily supported and isolated, and the large-inclination-angle anti-skidding device is matched. As the working face is pushed forwards, the bamboo basketry 9 is filled behind the gangue blocking bracket 8 after the gangue blocking bracket is moved, so as to prevent gangue leakage.
In this embodiment, step two the gentle mould concrete wall 7 on be equipped with slip casting mouth 26, be connected with the concrete conveying pipe, the concrete that will mix through the conveyer pipe is gone into in the gentle mould, utilizes the permeable to water of gentle mould not to pass through the characteristic of thick liquid, makes the concrete automatic molding in gentle mould.
In summary, the method for reserving and supporting the large-dip-angle medium-thickness coal seam strike long-wall mining special-shaped gob-side roadway can solve the problem of stability of the large-dip-angle medium-thickness coal seam gob-side roadway, improves the recovery rate of coal, reduces the labor intensity of workers, and greatly improves the construction safety.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (9)
1. A method for reserving and supporting a large-dip-angle medium-thickness coal seam strike long-wall mining special-shaped gob roadway is characterized by comprising the following steps:
the method comprises the following steps: reserving a large-dip-angle medium-thickness coal seam along a hollow roadway;
step two: the flexible mold concrete and the flexible cushion layer are strongly and weakly combined with the roadside filling support;
step three: and (4) supporting in a rigid-flexible combined roadway of the single prop and the full anchor system.
2. The method for reserving and supporting the special-shaped gob side roadway for the long-wall mining of the medium and thick coal seam with the large inclination angle of claim 1 is characterized in that in the first step, the specific steps are as follows:
step 1, a first section working face is pushed from a cutting hole to the front of the top plate for the first time of collapse, a gangue blocking support is placed in a transportation roadway at a lower port of the working face, close to a to-be-filled area at a goaf side, to prevent gangue, and a metal mesh and gangue blocking are laid;
and 2, generating O-X fracture after the top plate is initially collapsed, carrying out roof cutting and pressure relief at the position of an arc-shaped triangular plate at the lower port of the working face, collapsing the top plate of the working face along the edge of the transport roadway, retaining the transport roadway, and reserving the roadway to the position of a withdrawing channel of the working face at the lower section. The retained tunnel is used as a return air tunnel of the lower section working face.
3. The method for reserving and supporting the special-shaped gob side roadway for the long-wall mining in the strike of the large-dip-angle medium-thickness coal seam according to claim 1, wherein in the second step, the specific steps are as follows:
step 1, a flexible mold concrete wall body is positioned at the lower part of a roadside filling body and poured on the side of a wall body, and in order to prevent the wall body from sliding, a wall body foundation is dug to a hard bottom so as to increase the strength and the anti-sliding force of the wall body;
step 2, selecting proper concrete strength according to the geological conditions of the coal bed, and determining the thickness and height of the wall body at the initial stage; wherein, the height of the wall body is adjusted along with the change of the inclination angle of the top plate;
step 3, the flexible cushion layer is positioned on the upper part of the roadside filling body, and a proper flexible cushion layer can be selected according to different mine conditions to enhance the deformability of the roadside support body; for controlling the lateral deformation of the flexible mould wall body and enhancing the compressive strength of the flexible mould wall body, anchor bolts are arranged on the flexible mould, anchor bolts are made of anchor bolts, thread rolling is carried out at two ends of each anchor bolt, and a tray and nuts are respectively arranged at two ends of each anchor bolt.
4. The method for reserving and supporting the special-shaped gob side roadway for the long-wall mining of the medium and thick coal seam with the large inclination angle of claim 1 is characterized by comprising the following steps:
step 1, vertically driving an anchor rod and an anchor cable in a full-anchor system along a roadway top plate, adopting a high-strength thread anchor rod, enabling the slurry strength of an anchoring agent to be not lower than 20.0MPa, adopting three-speed anchoring cartridges of quick, medium and slow speed to be matched for use during operation, and quickly applying pretightening force after the quick anchoring agent takes effect;
step 2, selecting the specifications of the anchor cable according to the conditions of the top plate, wherein the slurry strength of the anchoring agent is similar to that of the anchor rod; the anchor net is arranged for protecting the meter by a wire net, and the W steel belt fixed by the anchor rod system is fixed; wherein the trend support density of the W steel belt is consistent with the row spacing of the anchor rods.
5. The method for reserving and supporting the special-shaped gob-side roadway for the long-wall mining of the strike of the medium and thick coal seams with the large inclination angle of claim 2,
in the step 2, the top plate is broken by O-X after the top plate is broken for the first time, and the arc-shaped triangular plate at the lower port of the working face is subjected to roof cutting and pressure relief, so that the peak value of the asymmetric stress arch formed in the top plate is deviated to the middle part of the working face, the movement of an overlying strata is slowed down, and the deformation of gob-side entry retaining surrounding rock is reduced.
6. The method for reserving and supporting the special-shaped gob-side roadway for the long-wall mining with the medium-thickness coal seam trend and the large inclination angle according to claim 2, wherein in the step 1, anchor rods are respectively driven into the metal mesh on the top floor of the gob to fix the metal mesh for gangue blocking.
7. The method for reserving and supporting the special-shaped gob-side roadway for long-wall mining of the medium-thickness coal seam with the large inclination angle as claimed in claim 2, wherein in the step 1, the gangue blocking supports are arranged in two rows, each row is provided with 3 gangue blocking plates, the goaf can be temporarily supported and isolated by connecting the gangue blocking plates with the working face supports for moving, and the large-inclination-angle antiskid devices are matched.
8. The method for reserving and supporting the special-shaped gob side roadway for the long-wall mining of the medium-thickness coal seam with the large inclination angle of claim 3, wherein in the step 1, the flexible mold concrete wall is provided with a grouting opening and is connected with a concrete conveying pipe, and the mixed concrete is pumped into the flexible mold through the conveying pipe.
9. The reserving and supporting method for the large-dip-angle medium-thickness coal seam strike long-wall mining special-shaped gob-side roadway according to claim 1, wherein the dip angle of the coal seam of the large-dip-angle medium-thickness coal seam is 35-55 degrees, and the thickness of the coal seam is 2-3 m.
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| CN201911266446.8A CN110925017B (en) | 2019-12-11 | 2019-12-11 | Reserving and supporting method for long-wall mining special-shaped gob-side roadway in large-dip-angle medium-thickness coal seam trend |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111720119A (en) * | 2020-07-22 | 2020-09-29 | 天地科技股份有限公司 | Coal mine pillar-free wall-reserving mining method |
| CN113586056A (en) * | 2021-09-28 | 2021-11-02 | 中煤科工开采研究院有限公司 | Efficient mining method for long-wall type thin coal seam and medium-thickness coal seam |
| CN113803110A (en) * | 2021-10-11 | 2021-12-17 | 山东科技大学 | Roadside filling and supporting method for gob-side entry retaining of large-dip-angle coal seam |
| CN114704320A (en) * | 2021-11-10 | 2022-07-05 | 中国矿业大学 | I-shaped tray and gob-side entry retaining mining side supporting structure |
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| CN111720119A (en) * | 2020-07-22 | 2020-09-29 | 天地科技股份有限公司 | Coal mine pillar-free wall-reserving mining method |
| CN113586056A (en) * | 2021-09-28 | 2021-11-02 | 中煤科工开采研究院有限公司 | Efficient mining method for long-wall type thin coal seam and medium-thickness coal seam |
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| CN113803110B (en) * | 2021-10-11 | 2023-11-03 | 山东科技大学 | Gob-side entry retaining roadside filling support method for large-dip-angle coal seam |
| CN114704320A (en) * | 2021-11-10 | 2022-07-05 | 中国矿业大学 | I-shaped tray and gob-side entry retaining mining side supporting structure |
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