CN113309520A - Reconstructed surrounding rock for advanced pre-splitting roof cutting gob-side entry retaining and construction method - Google Patents
Reconstructed surrounding rock for advanced pre-splitting roof cutting gob-side entry retaining and construction method Download PDFInfo
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- CN113309520A CN113309520A CN202110792804.XA CN202110792804A CN113309520A CN 113309520 A CN113309520 A CN 113309520A CN 202110792804 A CN202110792804 A CN 202110792804A CN 113309520 A CN113309520 A CN 113309520A
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- 239000000945 filler Substances 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 4
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 3
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- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 claims description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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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
- 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
- E21D11/155—Laggings made of strips, slats, slabs or sheet piles
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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
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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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Remote Sensing (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
A rebuilt surrounding rock used for pre-splitting the roof and staying along the goaf and a construction method. The rebuilding surrounding rock includes a filling bag, an anchor rod, a tray, a nut, a steel belt and a steel mesh; several filling bags are piled up until they are connected to the top and form a supporting body. The two sides of the supporting body are respectively reserved along the goaf and the mined-out area; the double-pull bolts are laid between the filling bags perpendicular to the direction of the roadway, and the two ends of the bolts are respectively extended to the reserved roadway and the goaf area; reinforced mesh is laid on both sides of the supporting body, and steel belt is laid on the surface of the reinforcement mesh. The extension end of the anchor rod passes through the reinforcement mesh and the steel belt in turn, and the pallet and nut are installed in turn through the extension end of the steel belt anchor rod. The method is: determining the construction location of the rebuilt surrounding rock support body; leveling the bottom plate and use the single hydraulic prop and the hinged beam to cooperate in advance support; strengthening the support; stacking the filling bags and spraying water for curing to increase the strength of the filling bags; stacking the filling bags to the top; laying steel mesh, installing steel belts, installing pallets and nuts, and tightening the nuts to apply prestress to the anchor rods.
Description
Technical Field
The invention belongs to the technical field of coal mining, and particularly relates to a reconstructed surrounding rock for an advanced presplitting roof cutting gob-side entry retaining and a construction method.
Background
The gob-side entry retaining is used as a coal pillar-free coal mining technology, the roadway excavation amount can be effectively reduced, the roadway protection coal pillars are omitted, the waste of coal resources is avoided, the connection time with the next working face is saved, and the coal mine capacity is effectively improved. Meanwhile, gob-side entry retaining guarantees the sealing performance of a goaf-side roadway, Y-shaped ventilation can be realized, the problem of gas gathering at the upper corner of a goaf is solved, and a large amount of time is saved for gas control especially in the process of mining a high-gas coal seam. Therefore, the gob-side entry retaining is green and efficient in mining, and safety guarantee is obtained in production.
At present, the gob-side entry retaining technology for weak and medium-hard roofs has more research results, but the gob-side entry retaining research results for coal seams with hard rock roof conditions are less research results. Under the condition of a large working face with mining height and a hard rock layer roof plate strip piece, the key point of implementing gob-side entry retaining lies in the coupling effect of entry retaining support and roof cutting, and because of the characteristics of hard rock layers, the roof of the overlying rock layer in the goaf can not fall off in time or fall off abnormally, so that the coal mining safety and the coal mining production progress can be greatly influenced.
Therefore, advance presplitting roof cutting measures need to be taken for the roof, the roof is controlled by the supporting structure according to supporting strength of a certain magnitude, the roof moving and sinking rule is adapted, the roadway roof is supported, and roof cutting is carried out in time, so that the pressure relief effect is achieved, and accidents such as rock burst, roof falling and the like caused by overlarge mine pressure due to the fact that basic roof falling is not timely caused are avoided. Meanwhile, the sealing performance inside the entry retaining is required to be ensured.
However, in the supporting structure widely used in the coal mine at present, high-water material filling and roof cutting pillars are mainly used, wherein the high-water filling process is complex, the material has strict requirements on the filling process, the underground conditions are complex and variable, the engineering conditions are difficult to meet, the filling effect is poor, the filling strength cannot reach the expected effect of roadway retaining, and the filling cost is high. When the support method such as a roof cutting support is used in a high-gas roadway, the sealing effect is not ideal, the rigidity property of the roof cutting support is limited, the roof cutting support is difficult to adapt to large deformation movement of a roof under the influence of secondary mining, and the stability of the roadway is influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a reconstructed surrounding rock for an advanced pre-splitting roof-cutting gob-side entry retaining and a construction method thereof, which have the functions of roof control, roof cutting, waste rock blocking and the like, and have the characteristics of high impact resistance stability, low filling cost, good sealing property, simple construction process, environment-friendly materials and the like.
In order to achieve the purpose, the invention adopts the following technical scheme: a reconstructed surrounding rock for an advanced presplitting roof cutting gob-side entry retaining comprises a filling bag, an anchor rod, a tray, a nut, a steel belt and a reinforcing mesh; the number of the filling bags is a plurality, the filling bags are piled up until the filling bags are connected to the roof, the filling bags in the piled state form a support body, and a gob-side entry retaining and a gob-side; the anchor rods are oppositely-pulled anchor rods, the number of the anchor rods is a plurality, all the anchor rods are paved between the filling bags in a direction perpendicular to the trend direction of the roadway, and two ends of each anchor rod respectively extend to the gob-side entry retaining and the gob-side; and a reinforcing mesh is laid on one side surface of the gob-side entry retaining and one side surface of the gob-side entry retaining of the support body, a steel belt is laid on the surface of the reinforcing mesh, the extending end of the anchor rod sequentially penetrates through the reinforcing mesh and the steel belt, and a tray and a nut are sequentially installed at the extending end of the anchor rod penetrating through the steel belt.
The bag body of the filling bag is a high-strength geotextile woven bag, the surface of the bag body of the filling bag is provided with a flame-retardant coating, the tensile strength of the bag body of the filling bag is greater than 50KN, a filler consisting of cement and sand with a set proportion is filled in the bag body of the filling bag, and the filling amount of the filler is 75%.
The steel band adopts three hole W shaped steel belts of vertical simply-connected, and every steel band joins in marriage with three stock of vertical row and joins in marriage.
The reinforcing mesh is a rhombic reinforcing mesh.
The height-to-width ratio of the support body is not more than 3: 1.
The filling bags are piled in a groined type, namely the filling bags on the upper layer and the lower layer which are adjacent are distributed in a groined type from the overlooking angle, and the filling bags on the upper layer and the lower layer which are adjacent are mutually vertically distributed.
A reconstruction surrounding rock construction method for advanced presplitting roof cutting gob-side entry retaining comprises the following steps:
the method comprises the following steps: before the coal face reaches the gob-side entry retaining, determining the construction position of the reconstructed surrounding rock supporting body, and ensuring that the supporting body is close to the outer side of the coal face and does not exceed the limit of the pre-splitting joint seam;
step two: leveling a roadway bottom plate at the construction position of the support body, and simultaneously utilizing the cooperation of a single hydraulic prop and a hinged beam to support in advance within 30m of the front of a coal face;
step three: reinforcing support in the roadway after the coal mining working face reaches the gob-side entry retaining position and the coal mining hydraulic support entering the roadway moves forwards;
step four: at the determined construction position of the reconstructed surrounding rock supporting body, the filling bags are piled up from the bottom plate of the roadway, and once water spraying maintenance is carried out after each layer of piling is finished until the strength of the filling bags is improved to a set value;
step five: the arrangement of the anchor rods is sequentially completed from bottom to top along with the continuous increase of the stacking height of the filling bags until the filling bags are stacked to the top;
step six: after the filling bags are piled up to the roof, the reinforcing mesh is firstly paved in place, then the steel belt is installed in place, finally the tray and the nut are installed in place, and prestress is applied to the anchor rod by screwing the nut.
The invention has the beneficial effects that:
1. after the roof is pre-cracked in advance under the condition of a hard roof coal seam, the filling bags are piled up to form a reconstructed surrounding rock main body, and lateral constraint is applied to the reconstructed surrounding rock main body through 'reinforcing mesh, steel belt and anchor rod', so that the reconstructed surrounding rock is in a three-dimensional stress state, higher bearing capacity is achieved, and meanwhile, advance support is carried out in cooperation with 'single hydraulic prop and hinged beam' in a roadway, and smooth follow-up roof cutting is guaranteed.
2. At the initial stage of sinking of the top plate, the working state of the reconstructed surrounding rock is flexible and plastic, and as the filling bag of the reconstructed surrounding rock has certain strength and compressibility, the original sinking movement trend of the roadway top plate is effectively changed under the support of the reconstructed surrounding rock, the movement of the top plate is limited, the top plate is forced to sink at a speed of a smaller order of magnitude, the energy release of the basic roof can be well controlled, and part of energy of the basic roof is also absorbed by the filling bag; due to the flexible and plastic characteristics of the reconstructed surrounding rock, the top plate deforms cooperatively after contacting with the reconstructed surrounding rock, so that no gap is ensured, the sealing performance and ventilation safety of the roadway are further ensured, and gas in the goaf can be effectively prevented from entering the interior of the roadway.
3. Along with the continuous sinking movement of the top plate, after the top plate is sunk and compressed, the constraint action of 'reinforcing mesh + steel belt + anchor rod' in the reconstructed surrounding rock is increased, the reconstructed surrounding rock is in a three-dimensional stress state, and the bearing capacity is greatly improved; the reconstructed surrounding rock has high working state and high supporting strength, not only has important promotion effect on the successful implementation of presplitting roof cutting, but also can resist the pressure effect under the influence of secondary mining.
4. The filling bag of the reconstructed surrounding rock adopts a groined piling mode and the supporting body is under a set height-to-width ratio, so that the reconstructed surrounding rock has stronger stability and stronger anti-overturning capability, and can effectively resist the pressure and impact action under the influence of secondary mining and the lateral pressure of waste rock falling in a goaf.
5. The reconstructed surrounding rock belongs to roadway support, the area of entering the roadway is small, and when the gob-side entry retaining is used as a transportation roadway, the required roadway inner space for equipment arrangement and transfer is not occupied, meanwhile, construction in a goaf is avoided, the gangue blocking function is achieved, and the safety of constructors is effectively guaranteed.
6. The reconstructed surrounding rock has the characteristics of high impact resistance stability, low filling cost, good sealing property, simple construction process, environment-friendly materials and the like, the construction materials are more convenient to transport and operate underground, compared with the traditional high-water filling technology, the working performance of the reconstructed surrounding rock is more suitable for the actual condition of the roof mine pressure change rule of the gob-side entry retaining, and the later stage of support is almost free from maintenance.
Drawings
FIG. 1 is a plan layout view of an advanced presplitting roof cut gob-side entry retaining;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic structural view of a reconstructed wall rock;
FIG. 4 is a schematic diagram of a filling bag stacking mode of the reconstructed surrounding rock;
in the figure, 1-filling bag, 2-anchor rod, 3-pallet, 4-nut, 5-steel belt, 6-reinforcing mesh, 7-gob-side entry retaining, 8-goaf, 9-coal face, 10-single hydraulic prop, 11-hinged beam, 12-coal body, 13-reconstructed surrounding rock.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1 to 4, the reconstructed surrounding rock for advanced pre-splitting roof-cutting gob-side entry retaining comprises a filling bag 1, an anchor rod 2, a tray 3, a nut 4, a steel belt 5 and a reinforcing mesh 6; the number of the filling bags 1 is a plurality, the filling bags 1 are piled up until the top contact, the filling bags 1 in the piled up state form a support body, and a gob-side entry retaining 7 and a gob-side gob-entry gob-side 8 are respectively arranged on two sides of the support body; the anchor rods 2 are oppositely-pulled anchor rods, the number of the anchor rods 2 is multiple, all the anchor rods 2 are laid between the filling bags 1 in a direction perpendicular to the trend direction of the roadway, and two ends of each anchor rod 2 extend to the gob-side entry retaining 7 and the gob-side area 8 respectively; reinforcing mesh 6 is laid on one side surface of the gob-side entry retaining 7 of the supporting body and one side surface of the gob-side area 8, steel belts 5 are laid on the surfaces of the reinforcing mesh 6, the extending end of the anchor rod 2 sequentially penetrates through the reinforcing mesh 6 and the steel belts 5, and the extending end of the anchor rod 2 penetrating through the steel belts 5 is sequentially provided with a tray 3 and a nut 4.
The bag body of the filling bag 1 is a high-strength geotextile woven bag, the surface of the bag body of the filling bag 1 is provided with a flame-retardant coating, the tensile strength of the bag body of the filling bag 1 is greater than 50KN, a filler composed of cement and sand with a set proportion is filled in the bag body of the filling bag 1, and the filling amount of the filler is 75%.
The steel belt 5 adopts a vertical single-connection three-hole W-shaped steel belt, and each steel belt 5 is assembled with three vertical anchor rods 2.
The reinforcing mesh 6 is a diamond reinforcing mesh.
The height-to-width ratio of the support body is not more than 3: 1.
The filling bags 1 are piled in a groined type, namely the filling bags 1 on the upper layer and the lower layer which are adjacent are distributed in a groined type from the overlooking angle, and the filling bags 1 on the upper layer and the lower layer which are adjacent are mutually vertically distributed.
A reconstruction surrounding rock construction method for advanced presplitting roof cutting gob-side entry retaining comprises the following steps:
the method comprises the following steps: before the coal face 9 reaches the gob-side entry retaining 7, determining the construction position of the reconstructed surrounding rock supporting body, and ensuring that the supporting body is close to the outer side of the coal face 9 and does not exceed the limit of a presplitting joint cut;
step two: leveling a roadway bottom plate at the construction position of a support body, and simultaneously utilizing the cooperation of a single hydraulic prop 10 and a hinged beam 11 to support in advance within the range of 30m in front of a coal face 9;
step three: reinforcing support in the roadway after the coal mining hydraulic support entering the roadway moves forwards along with the arrival of the coal mining working face 9 at the position of the gob-side entry retaining 7; the method comprises the following steps that a single hydraulic prop 10 and an articulated beam 11 are matched to carry out reinforced support at a position 500mm away from a support body in a roadway, the column spacing of the single hydraulic prop 10 is 800mm, and the row spacing of the single hydraulic prop 10 is 1000 mm;
step four: at the determined construction position of the reconstructed surrounding rock supporting body, the filling bag 1 is piled up from the bottom plate of the roadway, and after one layer of piling is finished, water spraying maintenance is carried out once until the strength of the filling bag 1 is improved to a set value;
step five: with the continuous increase of the stacking height of the filling bags 1, the arrangement of the anchor rods 2 is sequentially completed from bottom to top until the filling bags 1 are stacked to the top; it should be noted that after the filling bags 1 are piled up to the roof, if a gap is found between the top filling bag 1 and the roof, the gap can be plugged by gangue, cotton cloth or wood blocks to ensure seamless roof connection;
step six: after the filling bags 1 are piled up to the roof, the reinforcing mesh 6 is firstly paved in place, then the steel belt 5 is installed in place, finally the tray 3 and the nut 4 are installed in place, and prestress is applied to the anchor rod 2 by screwing the nut 4.
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 (7)
1. A reconstructed surrounding rock for advanced presplitting roof cutting gob-side entry retaining is characterized in that: comprises a filling bag, an anchor rod, a tray, a nut, a steel belt and a reinforcing mesh; the number of the filling bags is a plurality, the filling bags are piled up until the filling bags are connected to the roof, the filling bags in the piled state form a support body, and a gob-side entry retaining and a gob-side; the anchor rods are oppositely-pulled anchor rods, the number of the anchor rods is a plurality, all the anchor rods are paved between the filling bags in a direction perpendicular to the trend direction of the roadway, and two ends of each anchor rod respectively extend to the gob-side entry retaining and the gob-side; and a reinforcing mesh is laid on one side surface of the gob-side entry retaining and one side surface of the gob-side entry retaining of the support body, a steel belt is laid on the surface of the reinforcing mesh, the extending end of the anchor rod sequentially penetrates through the reinforcing mesh and the steel belt, and a tray and a nut are sequentially installed at the extending end of the anchor rod penetrating through the steel belt.
2. The reconstructed wall rock for advanced pre-splitting roof-cutting gob-side entry retaining according to claim 1, wherein: the bag body of the filling bag is a high-strength geotextile woven bag, the surface of the bag body of the filling bag is provided with a flame-retardant coating, the tensile strength of the bag body of the filling bag is greater than 50KN, a filler consisting of cement and sand with a set proportion is filled in the bag body of the filling bag, and the filling amount of the filler is 75%.
3. The reconstructed wall rock for advanced pre-splitting roof-cutting gob-side entry retaining according to claim 1, wherein: the steel band adopts three hole W shaped steel belts of vertical simply-connected, and every steel band joins in marriage with three stock of vertical row and joins in marriage.
4. The reconstructed wall rock for advanced pre-splitting roof-cutting gob-side entry retaining according to claim 1, wherein: the reinforcing mesh is a rhombic reinforcing mesh.
5. The reconstructed wall rock for advanced pre-splitting roof-cutting gob-side entry retaining according to claim 1, wherein: the height-to-width ratio of the support body is not more than 3: 1.
6. The reconstructed wall rock for advanced pre-splitting roof-cutting gob-side entry retaining according to claim 1, wherein: the filling bags are piled in a groined type, namely the filling bags on the upper layer and the lower layer which are adjacent are distributed in a groined type from the overlooking angle, and the filling bags on the upper layer and the lower layer which are adjacent are mutually vertically distributed.
7. A reconstruction surrounding rock construction method for advanced presplitting roof cutting gob-side entry retaining is characterized by comprising the following steps:
the method comprises the following steps: before the coal face reaches the gob-side entry retaining, determining the construction position of the reconstructed surrounding rock supporting body, and ensuring that the supporting body is close to the outer side of the coal face and does not exceed the limit of the pre-splitting joint seam;
step two: leveling a roadway bottom plate at the construction position of the support body, and simultaneously utilizing the cooperation of a single hydraulic prop and a hinged beam to support in advance within 30m of the front of a coal face;
step three: reinforcing support in the roadway after the coal mining working face reaches the gob-side entry retaining position and the coal mining hydraulic support entering the roadway moves forwards;
step four: at the determined construction position of the reconstructed surrounding rock supporting body, the filling bags are piled up from the bottom plate of the roadway, and once water spraying maintenance is carried out after each layer of piling is finished until the strength of the filling bags is improved to a set value;
step five: the arrangement of the anchor rods is sequentially completed from bottom to top along with the continuous increase of the stacking height of the filling bags until the filling bags are stacked to the top;
step six: after the filling bags are piled up to the roof, the reinforcing mesh is firstly paved in place, then the steel belt is installed in place, finally the tray and the nut are installed in place, and prestress is applied to the anchor rod by screwing the nut.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114263482A (en) * | 2021-12-27 | 2022-04-01 | 安徽理工大学 | Method for blasting-free roof cutting pressure relief gob-side roadway of soft-roof coal seam |
| CN116927809A (en) * | 2023-09-12 | 2023-10-24 | 北京中京矿安科技有限公司 | Roadway support structure and construction method thereof |
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| CN102425454A (en) * | 2011-09-22 | 2012-04-25 | 中国矿业大学 | Construction method of walling and filling combined gob-side entry retaining wall body |
| CN102661169A (en) * | 2012-04-28 | 2012-09-12 | 山东科技大学 | Gob-side entry retaining method for anchor bolt network gangue bag wall body for coal mining without pillars |
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| CN108457653A (en) * | 2018-02-22 | 2018-08-28 | 李柱和 | A kind of advanced deep hole presplitting top plate gob-side entry retaining method |
| CN109973114A (en) * | 2019-03-29 | 2019-07-05 | 华北水利水电大学 | Deep is without roadside packing gob side entry retaining country rock integrated control method |
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| CN114263482B (en) * | 2021-12-27 | 2024-02-13 | 安徽理工大学 | Soft roof coal seam non-blasting roof-cutting pressure-relief gob-side entry method |
| CN116927809A (en) * | 2023-09-12 | 2023-10-24 | 北京中京矿安科技有限公司 | Roadway support structure and construction method thereof |
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