CN114294008A - FRP strip constraint, sprayed concrete and geogrid combined coal pillar reinforcing method - Google Patents
FRP strip constraint, sprayed concrete and geogrid combined coal pillar reinforcing method Download PDFInfo
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- CN114294008A CN114294008A CN202210035210.9A CN202210035210A CN114294008A CN 114294008 A CN114294008 A CN 114294008A CN 202210035210 A CN202210035210 A CN 202210035210A CN 114294008 A CN114294008 A CN 114294008A
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- coal pillar
- geogrid
- frp strip
- frp
- coal
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- 239000003245 coal Substances 0.000 title claims abstract description 109
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 26
- 239000011378 shotcrete Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000004567 concrete Substances 0.000 claims abstract description 22
- 239000000853 adhesive Substances 0.000 claims abstract description 16
- 230000001070 adhesive effect Effects 0.000 claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 16
- 230000002787 reinforcement Effects 0.000 claims abstract description 13
- 238000004804 winding Methods 0.000 claims abstract description 11
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 5
- 239000000835 fiber Substances 0.000 claims description 16
- 239000004744 fabric Substances 0.000 claims description 12
- 239000003292 glue Substances 0.000 claims description 9
- 102100040287 GTP cyclohydrolase 1 feedback regulatory protein Human genes 0.000 claims description 3
- 101710185324 GTP cyclohydrolase 1 feedback regulatory protein Proteins 0.000 claims description 3
- 101710107464 Probable pyruvate, phosphate dikinase regulatory protein, chloroplastic Proteins 0.000 claims description 3
- 239000004918 carbon fiber reinforced polymer Substances 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 230000000452 restraining effect Effects 0.000 claims description 2
- 238000000605 extraction Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000005065 mining Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
A FRP strip constraint, shotcrete and geogrid combined coal pillar reinforcing method comprises the following steps: uniformly coating a layer of pressure-sensitive adhesive on the outer surface of the coal pillar; selecting a geogrid, uniformly coating a layer of pressure-sensitive adhesive on the inner surface of the geogrid, facing the adhesive coated surface of the geogrid to a coal pillar, and paving and adhering the geogrid to the outer surface of the coal pillar; mechanically reinforcing the space between the geogrid and the coal pillar by utilizing U-shaped fixing nails; spraying concrete to the outer surface of the coal pillar paved with the geogrid to form a concrete reinforcing layer; after the sprayed concrete is completely solidified and hardened, uniformly coating a layer of adhesive on the outer surface of the concrete reinforcing layer; selecting an FRP strip, uniformly coating a layer of adhesive on the inner surface of the FRP strip, enabling the adhesive coated surface of the FRP strip to face a coal pillar, and then winding and adhering the FRP strip on the outer surface of the concrete reinforcing layer along the circumferential direction, and finishing the reinforcement of the coal pillar. The invention can further reduce the size of the coal pillar and ensure the bearing capacity and stability of the coal pillar structure.
Description
Technical Field
The invention belongs to the technical field of coal mine safety, and particularly relates to a coal pillar reinforcing method combining FRP strip restraint, shotcrete and geogrid.
Background
In the coal resource exploitation process, a large number of coal pillars need to be reserved around a stope, and support can be formed between roadway top and bottom plates through the reserved coal pillars. However, the stability of the pillar structure, which determines the safety of the whole stope, is affected by the excavation activities, and once the pillar structure is unstable, catastrophic results will result.
At present, in order to improve the stability of a coal pillar structure, the reserved size of the coal pillar is increased in a common mode, but the reserved size of the coal pillar is too large, so that the coal extraction rate is inevitably reduced, and the waste of coal resources is caused. Meanwhile, on the basis, the coal pillar is reinforced by spraying concrete and drilling an anchor rope on the surface of the coal pillar. However, the traditional coal pillar reinforcement mode is established on the basis of reserving the coal pillars in large size, and if the traditional coal pillar reinforcement mode is adopted after the reserved size of the coal pillars is reduced, the bearing capacity and the stability of the coal pillar structure cannot be ensured.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the method for reinforcing the coal pillar by combining the FRP strip constraint, the shotcrete and the geogrid, which can further reduce the setting size of the coal pillar and effectively ensure the bearing capacity and the stability of the coal pillar structure, thereby further improving the coal extraction rate and avoiding the waste of coal resources.
In order to achieve the purpose, the invention adopts the following technical scheme: a FRP strip constraint, shotcrete and geogrid combined coal pillar reinforcing method comprises the following steps:
the method comprises the following steps: uniformly coating a layer of pressure-sensitive adhesive on the outer surface of the coal pillar;
step two: selecting a geogrid, uniformly coating a layer of pressure-sensitive adhesive on the inner surface of the geogrid, facing the adhesive coated surface of the geogrid to a coal pillar, and paving and adhering the geogrid to the outer surface of the coal pillar;
step three: mechanically reinforcing the space between the geogrid and the coal pillar by utilizing U-shaped fixing nails;
step four: spraying concrete to the outer surface of the coal pillar paved with the geogrid to form a concrete reinforcing layer;
step five: after the sprayed concrete is completely solidified and hardened, uniformly coating a layer of adhesive on the outer surface of the concrete reinforcing layer;
step six: selecting an FRP strip, uniformly coating a layer of adhesive on the inner surface of the FRP strip, enabling the adhesive coated surface of the FRP strip to face a coal pillar, and then winding and adhering the FRP strip on the outer surface of the concrete reinforcing layer along the circumferential direction, and finishing the reinforcement of the coal pillar.
In the first step, when the outer surface of the coal pillar has cracks, the cracks are filled with the epoxy resin glue before the pressure-sensitive glue is coated, and then the pressure-sensitive glue is coated.
In the fourth step, the sprayed concrete adopts coal gangue fiber concrete.
In the sixth step, the FRP strip selects CFRP fiber cloth, GFRP fiber cloth, AFRP fiber cloth or BFRP fiber cloth.
In the sixth step: the winding rule of the FRP strip is as follows: setting the winding number of the FRP strip as N, the diameter of the cross section of the coal pillar as D, and the height of the coal pillar as H; when H is less than 1, N is 5; when D is more than 1 and H is less than 3, N is 4; when D: H > 3, then N ═ 3.
When the cross section of the coal pillar is circular, the diameter D of the cross section of the coal pillar is a direct diameter; when the cross-sectional shape of the coal pillar is polygonal, the cross-sectional diameter D of the coal pillar is the equivalent diameter and satisfies
Wherein n is the number of sides of the polygon and is an integer of 4 or more, biThe side length of the polygon.
In the sixth step: the constraint influence coefficient of the FRP strip is set to be mu, and the condition that mu is S is satisfiedL/(SW+SL) Simultaneously satisfies [ mu ] e (0.25, 0.75), wherein SLThe distribution interval of the FRP strips in the height direction, SWIs the bandwidth of the FRP strip.
In the sixth step: the lap joint length of the FRP strip when being wound is set to be L, and L ═ pi D/2 is satisfied, wherein D is the section diameter of the coal pillar.
The invention has the beneficial effects that:
the FRP strip constraint and shotcrete and geogrid combined coal pillar reinforcing method can further reduce the reserved size of the coal pillar and effectively ensure the bearing capacity and stability of the coal pillar structure, thereby further improving the extraction rate of coal and avoiding the waste of coal resources.
Drawings
FIG. 1 is a schematic structural diagram of a coal pillar after the FRP strip restraining, shotcrete and geogrid combined coal pillar reinforcing method of the present invention is adopted;
in the figure, 1 is a coal pillar, 2 is a geogrid, 3 is concrete, and 4 is an FRP strip.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
A FRP strip constraint, shotcrete and geogrid combined coal pillar reinforcing method comprises the following steps:
the method comprises the following steps: uniformly coating a layer of pressure-sensitive adhesive on the outer surface of the coal pillar 1; when the outer surface of the coal pillar 1 has cracks, the cracks are filled with epoxy resin glue before the pressure-sensitive glue is coated, and then the pressure-sensitive glue is coated;
step two: selecting a geogrid 2, uniformly coating a layer of pressure-sensitive adhesive on the inner surface of the geogrid 2, enabling the adhesive coated surface of the geogrid 2 to face a coal pillar 1, and paving and adhering the geogrid 2 to the outer surface of the coal pillar 1;
step three: mechanically reinforcing the space between the geogrid 2 and the coal pillar 1 by utilizing U-shaped fixing nails;
step four: spraying concrete 3 to the outer surface of the coal pillar 1 paved with the geogrid 2 to form a concrete reinforcing layer; the sprayed concrete 3 adopts coal gangue fiber concrete; because a large amount of coal gangue is generated in the coal mining process, the stacking and storage of the coal gangue not only occupies a large space, but also affects the ecological environment of a mining area, and after the coal gangue is prepared into coal gangue fiber concrete, the problems caused by the stacking and storage of the coal gangue can be solved, the resource utilization of the coal gangue can be realized, and two purposes are achieved at one stroke;
step five: after the sprayed concrete 3 is completely solidified and hardened, uniformly coating a layer of adhesive on the outer surface of the concrete reinforcing layer;
step six: selecting an FRP strip 4, uniformly coating a layer of adhesive on the inner surface of the FRP strip 4, enabling the adhesive coated surface of the FRP strip 4 to face a coal pillar 1, winding and adhering the FRP strip 4 on the outer surface of a concrete reinforcing layer along the circumferential direction, and finishing the reinforcement of the coal pillar, as shown in figure 1; the FRP strip 4 is made of CFRP fiber cloth, GFRP fiber cloth, AFRP fiber cloth or BFRP fiber cloth. The FRP strip 4 is lightweight,The coal pillar has the characteristics of high light degree and good corrosion resistance, and after the FRP strips 4 are used for constraint construction of the coal pillar 1, extra corrosion prevention measures can be omitted, so that the maintenance cost is reduced; the winding rule of the FRP strip 4 is: setting the winding number of the FRP strip 4 as N, the section diameter of the coal pillar 1 as D, and the height of the coal pillar 1 as H; when H is less than 1, N is 5; when D is more than 1 and H is less than 3, N is 4; when D is H > 3, then N is 3; when the cross section of the coal pillar 1 is circular, the diameter D of the cross section of the coal pillar 1 is a direct diameter; when the cross-sectional shape of the coal pillar 1 is polygonal, the cross-sectional diameter D of the coal pillar 1 is an equivalent diameter, and satisfies
Wherein n is the number of sides of the polygon and is an integer of 4 or more, biIs the side length of the polygon; the constraint influence coefficient of the FRP strip 4 is μ, and μ ═ S is satisfiedL/(SW+SL) Simultaneously satisfies [ mu ] e (0.25, 0.75), wherein SLThe distribution interval S of the FRP strips 4 in the height directionWIs the bandwidth of the FRP strip 4. When mu is equal to 0, 0.25]When the distribution interval of the FRP strips 4 in the height direction is too small, the distribution interval of the FRP strips 4 needs to be readjusted until the distribution interval meets the mu e (0.25, 0.75); when mu is equal to [0.75, 1 ]]When the distribution interval of the FRP strips 4 in the height direction is too large, the distribution interval of the FRP strips 4 also needs to be readjusted until the distribution interval meets the mu epsilon (0.25, 0.75); the lap length of the FRP strip 4 during winding is L, and L ═ pi D/2 is satisfied, where D is the cross-sectional diameter of the coal pillar 1.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.
Claims (8)
1. A FRP strip restraining, shotcrete and geogrid combined coal pillar reinforcing method is characterized by comprising the following steps:
the method comprises the following steps: uniformly coating a layer of pressure-sensitive adhesive on the outer surface of the coal pillar;
step two: selecting a geogrid, uniformly coating a layer of pressure-sensitive adhesive on the inner surface of the geogrid, facing the adhesive coated surface of the geogrid to a coal pillar, and paving and adhering the geogrid to the outer surface of the coal pillar;
step three: mechanically reinforcing the space between the geogrid and the coal pillar by utilizing U-shaped fixing nails;
step four: spraying concrete to the outer surface of the coal pillar paved with the geogrid to form a concrete reinforcing layer;
step five: after the sprayed concrete is completely solidified and hardened, uniformly coating a layer of adhesive on the outer surface of the concrete reinforcing layer;
step six: selecting an FRP strip, uniformly coating a layer of adhesive on the inner surface of the FRP strip, enabling the adhesive coated surface of the FRP strip to face a coal pillar, and then winding and adhering the FRP strip on the outer surface of the concrete reinforcing layer along the circumferential direction, and finishing the reinforcement of the coal pillar.
2. The FRP strip confined, shotcrete and geogrid combined coal pillar reinforcement method according to claim 1, wherein: in the first step, when the outer surface of the coal pillar has cracks, the cracks are filled with the epoxy resin glue before the pressure-sensitive glue is coated, and then the pressure-sensitive glue is coated.
3. The FRP strip confined, shotcrete and geogrid combined coal pillar reinforcement method according to claim 1, wherein: in the fourth step, the sprayed concrete adopts coal gangue fiber concrete.
4. The FRP strip confined, shotcrete and geogrid combined coal pillar reinforcement method according to claim 1, wherein: in the sixth step, the FRP strip selects CFRP fiber cloth, GFRP fiber cloth, AFRP fiber cloth or BFRP fiber cloth.
5. The FRP strip confined, shotcrete and geogrid combined coal pillar reinforcement method according to claim 1, wherein: in the sixth step: the winding rule of the FRP strip is as follows: setting the winding number of the FRP strip as N, the diameter of the cross section of the coal pillar as D, and the height of the coal pillar as H; when H is less than 1, N is 5; when D is more than 1 and H is less than 3, N is 4; when D: H > 3, then N ═ 3.
6. The FRP strip bonded, shotcrete bonded and geogrid combined coal pillar reinforcement method according to claim 5, wherein: when the cross section of the coal pillar is circular, the diameter D of the cross section of the coal pillar is a direct diameter; when the cross-sectional shape of the coal pillar is polygonal, the cross-sectional diameter D of the coal pillar is the equivalent diameter and satisfies
Wherein n is the number of sides of the polygon and is an integer of 4 or more, biThe side length of the polygon.
7. The FRP strip confined, shotcrete and geogrid combined coal pillar reinforcement method according to claim 1, wherein: in the sixth step: the constraint influence coefficient of the FRP strip is set to be mu, and the condition that mu is S is satisfiedL/(SW+SL) Simultaneously satisfies [ mu ] e (0.25, 0.75), wherein SLThe distribution interval of the FRP strips in the height direction, SWIs the bandwidth of the FRP strip.
8. The FRP strip confined, shotcrete and geogrid combined coal pillar reinforcement method according to claim 1, wherein: in the sixth step: the lap joint length of the FRP strip when being wound is set to be L, and L ═ pi D/2 is satisfied, wherein D is the section diameter of the coal pillar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210035210.9A CN114294008B (en) | 2022-01-13 | 2022-01-13 | FRP strip constraint and sprayed concrete and geogrid combined coal column reinforcement method |
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| CN202210035210.9A CN114294008B (en) | 2022-01-13 | 2022-01-13 | FRP strip constraint and sprayed concrete and geogrid combined coal column reinforcement method |
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| CN114294008B CN114294008B (en) | 2024-03-05 |
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