CN114263464B - Mining-induced island working face roadway surrounding rock pressure relief anchoring cooperative control method - Google Patents
Mining-induced island working face roadway surrounding rock pressure relief anchoring cooperative control method Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention discloses a mining-ward island working face roadway surrounding rock pressure relief anchoring cooperative control method, which is used for determining the area where an island working face roadway is located in a mining-ward stage and monitoring the roadway surrounding rock mine pressure display law, wherein the mining-ward stage comprises a unidirectional mining influence stage, a bidirectional mining influence stage and a goaf side influence stage; supporting the island working face roadway in the mining-facing stage according to the surrounding rock ore pressure showing rule to obtain an island working face system; monitoring stress of surrounding rock of a roadway before stoping of an island working face, and determining a high-stress area of the island working face; carrying out hydraulic fracturing pressure relief on the top plate of the high-stress area of the island working face, and monitoring the mine pressure of surrounding rock of the tunnel of the island working face after the hydraulic fracturing pressure relief so as to realize cooperative control on the surrounding rock of the tunnel of the island working face; the invention combines the roof cutting pressure relief technology and the anchor bolt supporting technology to form a synergistic mechanism, effectively controls the deformation of the roadway, and achieves the purpose of 'one-time supporting and never repairing'.
Description
Technical Field
The invention belongs to the technical field of coal mine safety exploitation, and particularly relates to a cooperative control method for pressure relief and anchoring of surrounding rock of a roadway of an island-ward working face.
Background
The mining depth is large, the shape is irregular, the mining is extremely in two sides and is extremely in a multi-side mining (including mining excavation) as a typical strong mine pressure high-risk working face, under the comprehensive actions of a primary rock stress field, a mining side stress field and mining advanced concentrated stress of the working face, the coal (rock) body generates 'severe' power damage, stress concentration is extremely easy to occur, and particularly the strong mine pressure phenomenon of natural structural areas such as faults, dense roadways, irregular coexistence and mining excavation areas is more frequent. The problem of strong mine pressure treatment of the mining excavation area is a great technical problem in coal mining nationally.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for cooperatively controlling the pressure relief and anchoring of surrounding rock of a roadway of an island-ward working surface, which solves the problem that the roadway of the island generates 'severe' power damage under the comprehensive actions of a primary rock stress field, a unidirectional mining stress field, a bidirectional mining stress field, a mining side stress field and the mining advanced concentrated stress of the working surface.
In order to achieve the above purpose, the present invention provides the following technical solutions: a mining-induced island working face roadway surrounding rock pressure relief anchoring cooperative control method comprises the following specific steps:
S1, determining an area where an island working face roadway is located in a mining-facing stage, and monitoring a roadway surrounding rock mine pressure display rule, wherein the mining-facing stage comprises a unidirectional mining influence stage, a bidirectional mining influence stage and a goaf side influence stage;
S2, supporting the island working face roadway in the mining-facing stage according to the surrounding rock ore pressure showing rule to obtain an island working face system;
S3, monitoring the stress of surrounding rock of a roadway before stoping of the island working face, and determining a high-stress area of the island working face;
and S4, hydraulic fracturing pressure relief is carried out on the top plate of the high-stress area of the island working face, and the mine pressure of the surrounding rock of the tunnel of the island working face is monitored after the hydraulic fracturing pressure relief, so that the cooperative control of the surrounding rock of the tunnel of the island working face is realized.
Further, in step S1, an overlapping area of an influence range of the stoping of the adjacent working face and the tunneling of the island working face on the supporting stress of the coal pillar is a bidirectional mining influence stage, a unidirectional mining influence stage is arranged at the rear of the bidirectional mining influence stage, and a goaf side influence stage is arranged at the front of the bidirectional mining influence stage.
Further, in step S1, through roadway mining-facing tunneling simulation, stress and deformation characteristics of surrounding rock of the island working face roadway in the mining-facing stage are obtained, and a surrounding rock ore pressure displaying rule is determined according to the stress and deformation characteristics.
Further, in the step S2, during supporting, an anchor net rope is adopted for supporting in the unidirectional mining influence stage, and a high-flexibility grouting anchor rope is adopted for reinforcing the upper part; the bidirectional mining influence stage adopts an anchor net cable for supporting, and the upper part and the top plate are reinforced by a high-flexibility grouting anchor cable; the goaf side impact stage adopts an anchor net rope for supporting.
In step S3, the stress of the surrounding rock of the roadway is monitored by using an anchor rod dynamometer before the stope of the island working face, and the deformation of the surrounding rock of the roadway is monitored by using a laser range finder.
In step S4, drilling is carried out on the side of the coal pillar upper when hydraulic fracturing pressure relief is carried out, the azimuth angle of the drilling is perpendicular to the coal pillar upper, the inclination angle of the drilling is 70 degrees, the drilling interval is 10-20 m, and the vertical height of the drilling is the basic top height; the horizontal length of the borehole and the depth of the borehole are determined according to the borehole inclination angle and the borehole vertical.
In step S4, the single fracturing time under 15-40 Mpa pressure is 20-30 min when hydraulic fracturing pressure relief is carried out.
Further, in step S4, when hydraulic fracturing pressure relief is performed, the number of fracturing times is determined according to the structure and the thickness of the roof strata; and fracturing from the bottom of the drill hole to the orifice, wherein the fracturing interval is 3-6 m, and the final fracturing position is near the interface between the coal seam roof and the coal seam.
In step S4, the hole is sealed when hydraulic fracturing pressure relief is carried out, and the sealing pressure is 12-16 Mpa.
In step S4, the hydraulic fracturing is completed, and then the fracturing holes are sealed with cement slurry.
Compared with the prior art, the invention has at least the following beneficial effects:
According to the collaborative control method for pressure relief and anchoring of the surrounding rock of the island working face roadway, the island working face roadway is divided into the island working face roadway mining stages, different supporting methods are adopted at different stages, hydraulic fracturing, roof cutting and pressure relief are carried out on a roadway top plate before the island working face is mined back, and stability of the surrounding rock of the roadway is guaranteed.
Drawings
FIG. 1 is a division diagram of an island working face roadway in a mining-facing stage;
FIG. 2 is a schematic illustration of an island face pressure relief borehole plan;
FIG. 3 is a schematic diagram of an island face pressure relief borehole profile arrangement;
FIG. 4 is a hydraulic fracturing process diagram;
FIG. 5 is a flow chart of a hole sealing process;
FIG. 6 is a flow chart of a pressurized fracturing process;
Fig. 7 is a view of a 4D optical borehole television embodiment.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
As shown in fig. 1 to 3, the invention provides a mining-induced tunneling island working face roadway surrounding rock pressure relief anchoring cooperative control method, which comprises the following specific steps:
1) And determining the mining-facing stage of the island working face roadway.
According to the space-time relation of the stoping of the adjacent working face and the tunneling of the island working face, the stoping working face and the tunneling process of the island working face undergo a unidirectional mining influence stage, a bidirectional mining influence stage and a goaf side influence stage.
2) And determining the regional division of each stage of the island working face roadway.
The unidirectional mining influence phase is an influence phase of island working face roadway tunneling on island working face roadway surrounding rock, the bidirectional mining influence phase is an influence phase of adjacent working face stoping and island working face roadway tunneling on the island working face roadway surrounding rock together, and the goaf side influence phase is an influence phase of adjacent working face stoping on the island working face roadway. The emphasis on the division of the stages is therefore on the division of the bi-directional dynamic pressure segments.
And carrying out roadway mining-facing tunneling simulation by using FLAC3D numerical simulation software, and respectively calculating the influence ranges of mining on the adjacent working face and island working face tunneling on the supporting stress of the coal pillar, wherein the overlapping area of the mining-facing tunneling simulation and the island working face tunneling simulation is a bidirectional mining-facing influence stage. The rear of the area is a unidirectional mining influence stage, and the front of the area is a goaf side influence stage.
3) And determining the rock pressure display rule of the roadway surrounding rock at each stage of the island working face roadway.
And carrying out roadway mining-facing tunneling simulation by using FLAC3D numerical simulation software, and calculating stress and deformation characteristics of the surrounding rock of the roadway of the island working face at each stage. And installing a dynamometer on the supporting single body to monitor the stress of the surrounding rock of the roadway. And monitoring surrounding rock deformation by using a laser range finder through a cross point distribution method. And analyzing the rock pressure display rule of the roadway surrounding rock at each stage of the island working face roadway through the simulation and monitoring data.
4) And determining supporting parameters of each stage of the tunneling period of the island working face.
According to the stress and deformation rules of the roadway surrounding rock at each stage of the roadway, the supporting mode and the supporting mode of the unidirectional mining influence stage, the bidirectional mining influence stage and the goaf side influence stage are determined, and specifically:
Unidirectional mining influence phase: the section adopts an anchor net rope for supporting, and the upper part is reinforced by a high-flexibility grouting anchor rope.
Bidirectional mining influencing stage: the section adopts an anchor net rope for supporting, and the upper part and the top plate are reinforced by a high-flexibility grouting anchor rope.
Goaf side influencing stage: the section is supported by an anchor net rope.
5) And monitoring the mine pressure before the back production of the island working face.
And forming an island working face system after the working face stoping is finished and the island working face tunnel is supported, monitoring the stress of surrounding rocks of the tunnel by using an anchor rod dynamometer before the island working face stoping, monitoring the deformation of the surrounding rocks of the tunnel by using a laser range finder through a cross point distribution method, and determining a high-stress area of the island working face.
6) Hydraulic fracturing pressure relief is carried out on the top plate of the high stress area, and drilling is carried out on the side of the coal pillar upper, wherein the specific drilling parameters are as follows:
Pore diameter: the bore diameter is generally matched with the diameters of the fracturing pipe and the double-end water shutoff device, the diameter of the double-end water shutoff device is generally 50mm, so that the diameter of a drilled hole is 56mm, if the top plate is weak, the hole collapse phenomenon is easy to occur, and the sleeve is installed on the section to prevent the hole collapse.
Drilling pitch: according to the past hydraulic fracturing roof-laying engineering experience, the diffusion radius of hydraulic fracturing is 5-10 m, and the fracturing capacity of equipment is considered, so that the hole spacing of the coal pillar upper side is 10-20 m.
Drilling azimuth angle: perpendicular to the coal pillar upper, saves the construction work amount.
Drilling inclination angle: the inclination angle of the drill hole is determined to be 70 degrees in consideration of site construction conditions, drilling engineering quantity and basic fracture characteristics.
Drilling vertical height: the borehole height is generally dependent on the base roof height, so the borehole vertical height is the base roof height.
Drilling horizontal length: and calculating the horizontal length of the drilling hole according to the inclination angle and the vertical height of the drilling hole.
Drilling depth: and calculating the drilling depth according to the drilling inclination angle and the drilling vertical height.
The fracturing parameters are as follows.
Fracturing pressure: according to the elastic theory, the coal seam roof conditions and the hydraulic fracturing experience of the previous working face, the hydraulic fracturing pressure (normally between 15 and 40 MPa) can be estimated to meet the fracturing requirement.
Number of fracturing times: the fracturing times are determined according to the structure of the rock stratum of the roof of the coal bed and the thickness of the rock stratum, the coal seam is fractured from the bottom of the drilling hole to the orifice gradually, the fracturing interval is about 3 m-6 m, the fracturing final position is near the interface between the roof of the coal bed and the coal bed according to the peeping result of the drilling hole and the fracturing condition.
Fracturing time: according to the water outlet condition of surrounding drilling and the fracturing curve, when the pressure of the fracturing curve is obviously reduced or the water outlet and water inlet (about 80L/min), stopping fracturing operation, and according to implementation experience, the single fracturing time is about 20-30 minutes.
7) Hydraulic fracturing pressure relief process flow.
The hydraulic fracturing process is shown in fig. 4, a manual pump is used for pressurizing a packer to expand a rubber cylinder (fig. 4 a), the purpose of sealing holes is achieved, and then a high-pressure pump is connected to perform fracturing (fig. 4 b).
The hole sealing process flow chart is shown in figure 5, the hole sealing pressure is 12-16 MPa, the pipeline is connected strictly according to the following chart, the connection is ensured to be sealed well, and the hole sealing process flow chart is put into use after the pressure test reaches the requirement. Pressurizing to 2-5 MPa for checking sealing condition during pressure test:
the pressurized fracturing process flow chart is shown in fig. 6, the fracturing time is determined according to the pumping pressure, and the fracturing is stopped after the pumping pressure is stabilized. And (5) sealing the fracturing Kong Yongshui slurry after hydraulic fracturing is finished.
The hydraulic fracturing pipeline is connected with: clear water tank, rubber pipe, high-pressure pump water inlet, pump self, high-pressure pump water outlet, high-pressure rubber pipe, T connecting piece, water delivery rod and high-pressure packer.
8) And (5) monitoring fracturing effect. In the fracturing process, the water outlet condition of the constructed drilling holes around the fracturing holes is observed, and if water is discharged from the surrounding holes in the fracturing process, the fracturing range can be roughly determined. In the fracturing process, parameters such as high-pressure pump water outlet pressure change, fracturing drilling hole orifice pressure change, fracturing time and the like are strictly recorded, a construction ledger is established, timely treatment is carried out when the situation is abnormal, and the fracturing effect is ensured. The condition of the crack after fracturing is observed in the fracturing hole through a three-dimensional imaging observation system, as shown in fig. 7. If the water yield of the peripheral holes is large and a large number of cracks appear on the inner walls of the holes after the observation of the three-dimensional imaging observation system, the surface fracturing effect is good.
The mine pressure monitoring station and the roadway displacement observation station are arranged on the island working face roadway to test actual pressure relief and supporting effects of the roadway, the mine pressure monitoring station adopts a hydraulic single body stress meter and an anchor rod dynamometer, the roadway displacement observation station monitors the stress deformation of surrounding rocks of the roadway by using a laser range finder, and mine pressure monitoring data of the pressure relief roadway and the roadway which is not subjected to pressure relief are compared, so that the mine pressure of the surrounding rocks of the roadway after pressure relief is obviously reduced.
The method is applied to the island working face of the Shaanxi Chengjia coal development Co., ltd 1506, the peak stress of coal pillars is reduced from 17.2MPa to 10.3MPa, the approach amount of the top and bottom plates of the tunnel is reduced from 1200mm to 400mm, the approach amount of two sides is reduced from 850mm to 350mm, and compared with monitoring data, after hydraulic fracturing pressure relief, the stress and deformation of surrounding rocks of the tunnel are obviously reduced, so that the surrounding rocks of the tunnel are effectively controlled under the synergistic effect of pressure relief and anchoring, and the safe and efficient production of the coal mine is facilitated.
Claims (4)
1. A mining-ward island working face roadway surrounding rock pressure relief anchoring cooperative control method is characterized by comprising the following specific steps:
S1, determining an area where an island working face roadway is located in a mining-facing stage, and monitoring a roadway surrounding rock mine pressure display rule, wherein the mining-facing stage comprises a unidirectional mining influence stage, a bidirectional mining influence stage and a goaf side influence stage;
S2, supporting the island working face roadway in the mining-facing stage according to the surrounding rock ore pressure showing rule to obtain an island working face system;
S3, monitoring the stress of surrounding rock of a roadway before stoping of the island working face, and determining a high-stress area of the island working face;
S4, hydraulic fracturing pressure relief is carried out on the top plate of the high-stress area of the island working face, and the mine pressure of surrounding rock of the tunnel of the island working face is monitored after the hydraulic fracturing pressure relief, so that cooperative control of the surrounding rock of the tunnel of the island working face is realized;
in the step S1, an overlapping area of an influence range of mining on a coal pillar supporting stress by a working face adjacent to a working face and tunneling on an island working face is a bidirectional mining influence stage, the rear part of the bidirectional mining influence stage is a unidirectional mining influence stage, and the front part of the bidirectional mining influence stage is a goaf side influence stage;
In the step S1, the stress and deformation characteristics of surrounding rock of an island working face roadway in the mining-facing stage are obtained through roadway mining-facing tunneling simulation, and the surrounding rock ore pressure showing rule is determined according to the stress and deformation characteristics;
In the step S2, during supporting, an anchor net rope is adopted for supporting in the unidirectional mining influence stage, and a high-flexibility grouting anchor rope is adopted for reinforcing the upper part; the bidirectional mining influence stage adopts an anchor net cable for supporting, and the upper part and the top plate are reinforced by a high-flexibility grouting anchor cable; the goaf side impact stage adopts an anchor net cable support;
in the step S4, drilling is carried out on the side of the coal pillar side when hydraulic fracturing pressure relief is carried out, the azimuth angle of the drilling is perpendicular to the coal pillar side, the inclination angle of the drilling is 70 degrees, the drilling interval is 10-20 m, and the vertical height of the drilling is the basic top height; the horizontal length and depth of the drilling hole are determined according to the inclination angle and the vertical height of the drilling hole;
In the step S4, when hydraulic fracturing pressure relief is carried out, the time of single fracturing under 15-40 Mpa pressure is 20-30 min;
in the step S4, when hydraulic fracturing pressure relief is carried out, the fracturing times are determined according to the structure and the layer thickness of the roof layer; and fracturing from the bottom of the drill hole to the orifice, wherein the fracturing interval is 3-6 m, and the final fracturing position is near the interface between the coal seam roof and the coal seam.
2. The collaborative control method for pressure relief and anchoring of roadway surrounding rock of an island-mining-face roadway according to claim 1, wherein in step S3, roadway surrounding rock stress monitoring is carried out by using an anchor rod dynamometer before the island-mining face is mined, and roadway surrounding rock deformation monitoring is carried out by using a laser range finder.
3. The collaborative control method for pressure relief and anchoring of surrounding rock of a roadway of an island-on-mining face according to claim 1, wherein in the step S4, holes are sealed when hydraulic fracturing pressure relief is carried out, and the sealing pressure is 12 Mpa-16 Mpa.
4. The collaborative control method for pressure relief and anchoring of surrounding rock of a roadway of an island-on-mining face according to claim 1, wherein in step S4, cement slurry is used for sealing a fracturing hole after hydraulic fracturing is finished.
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| CN115977637B (en) * | 2023-03-01 | 2023-08-08 | 中国矿业大学(北京) | Continuous pressure relief system and method for interior of surrounding rock of continuous large-deformation roadway |
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| CN106761742B (en) * | 2016-11-23 | 2019-04-16 | 西安科技大学 | A kind of deep island working face gob side entry driving surrounding rock stability control method |
| CN107191208B (en) * | 2017-06-26 | 2019-04-30 | 永城煤电控股集团有限公司 | Rigid protection body Support Method in the lane flexible support Ti Yu by gob side entry retaining lane |
| CN109184762B (en) * | 2018-11-07 | 2020-09-11 | 辽宁工程技术大学 | Rock bolt modified surrounding rock impact ground pressure prevention method for extra-thick coal seam |
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