Hydraulic fracturing top-cutting pressure relief method and device for coal mine collecting and working line and medium

Abstract

The invention relates to the technical field of roadway surrounding rock control, and discloses a hydraulic fracturing top-cutting pressure relief method and device for a coal mine collecting and working line and a medium. The method comprises the steps that roadway geological exploration data of roadway surrounding rock are obtained, and a geological model is constructed according to the roadway geological exploration data; dividing the roadway surrounding rock into an anchoring area and a pressure relief area according to the geologic model; and alternately controlling the anchoring area and the pressure relief area by using preset control parameters. According to the method, the self-bearing capacity of rock mass can be enhanced through high-pretightening-force strong supporting in the anchoring area, meanwhile, the overall stress of surrounding rock is reduced through blasting pressure relief outside the pressure relief area, and precise regulation and control and deformation suppression of the surrounding rock stress environment are achieved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic fracturing and roof cutting pressure relief technology, specifically a hydraulic fracturing and roof cutting pressure relief method, equipment, and medium for coal mine production lines. Background Technology

[0002] With the mining of deep coal resources, the mining-induced stress is becoming increasingly severe, especially in the working line area of ​​the longwall face. Because the roof structure in the goaf has not completely collapsed, high stress concentration zones are easily formed, leading to roadway deformation, support damage, and even triggering major disasters such as rockbursts. Traditional roof-cutting and stress-relieving methods, such as blasting and mechanical cutting, suffer from problems such as high vibration, poor control precision, and high operational risks, making them difficult to meet the requirements of safe and efficient deep mining.

[0003] In summary, existing technologies mostly focus on weakening the roof in the leading section of the working face or the two roadway areas, lacking systematic fracturing design and stress barrier construction methods for the closing line area. As a result, the main roadway behind the closing line is still affected by high stress, and the roadway deformation is difficult to control.

[0004] Therefore, improving the accuracy and safety of hydraulic fracturing and roof cutting for pressure relief in coal mine production lines has become an urgent problem to be solved. Summary of the Invention

[0005] The technical problem to be solved by this invention is how to accurately and safely carry out hydraulic fracturing, roof cutting, and pressure relief in coal mine production lines.

[0006] The present invention solves the above-mentioned technical problems through the following technical means: This invention provides a method for hydraulic fracturing and roof-cutting depressurization in a coal mine, characterized by comprising: Obtain geological exploration data of the surrounding rock of the tunnel, and construct a geological model based on the geological exploration data of the tunnel; Based on the geological model, the surrounding rock of the tunnel is divided into an anchoring zone and a pressure relief zone; The anchoring zone and the pressure relief zone are alternately controlled using preset control parameters.

[0007] The present invention also provides a processing device, characterized in that it includes at least one processor and at least one memory communicatively connected to the processor, wherein: the memory stores program instructions executable by the processor, and the processor can execute the above-described method for hydraulic fracturing and roof cutting and depressurization of a coal mine receiving line by calling the program instructions.

[0008] The present invention also provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions, the computer instructions causing the computer to execute the above-described method of hydraulic fracturing and roof-cutting depressurization in a coal mine production line.

[0009] The advantages of this invention are: This invention divides the surrounding rock of the roadway into an anchoring zone and a stress relief zone. By controlling the parameters, the high pre-tightening force and strong support in the anchoring zone enhance the self-supporting capacity of the rock mass, while the blasting stress relief outside the stress relief zone reduces the overall stress of the surrounding rock. This achieves a synergistic effect of "internal consolidation and external release" in deformation control, thereby enabling precise regulation and deformation suppression of the surrounding rock stress environment. Attached Figure Description

[0010] Figure 1 This is a schematic flowchart of a hydraulic fracturing and roof-cutting depressurization method for a coal mine receiving line according to an embodiment of the present invention. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0012] Reference Figure 1 The diagram shown is a flowchart illustrating a hydraulic fracturing roof-cutting and pressure-relief method for a coal mine operating line according to an embodiment of the present invention. In this embodiment, the hydraulic fracturing roof-cutting and pressure-relief method for a coal mine operating line includes: S1. Obtain geological exploration data of the surrounding rock of the tunnel, and construct a geological model based on the geological exploration data of the tunnel.

[0013] In this embodiment of the invention, a geological model is constructed using finite element simulation software (e.g., ANSYS) based on tunnel geological exploration data (such as borehole coring and stress monitoring).

[0014] S2. Based on the geological model, the surrounding rock of the tunnel is divided into an anchoring zone and a pressure relief zone.

[0015] In this embodiment of the invention, the distribution of surrounding rock in the tunnel can be divided into an anchoring zone (0-5m) and a stress relief zone (5-20m) based on the surrounding rock stress. The anchoring zone is a high-strength anchoring layer, and the stress relief zone is a stress-relieving layer. The evaluation parameters include the surrounding rock RMR grade (>40) and the ground stress level (>15MPa).

[0016] S3. The anchoring zone and the pressure relief zone are alternately controlled using preset control parameters.

[0017] In this embodiment of the invention, the control parameters include the parameters of the high preload strong support in the anchoring zone and the blasting parameters in the pressure relief zone.

[0018] Specifically, the alternating control of the anchoring zone and the pressure relief zone using preset control parameters includes: The anchoring zone and the pressure relief zone are alternately divided to obtain the roadway surrounding rock control sequence; Based on the control sequence of the surrounding rock of the roadway, the anchoring zone is subjected to high pre-tightening strong support and the decompression zone is subjected to blasting decompression.

[0019] In detail, support and blasting can be carried out alternately, with a cycle every 50m of tunnel advance, to avoid the negative impact of blasting disturbance on the anchoring zone.

[0020] In this embodiment of the invention, a high-strength anchor cable system can be arranged within the anchorage zone to provide high preload and strong support for the anchorage zone. The high-strength anchor cable system includes: Anchor configuration: Use steel strand anchors with a diameter of 20-25mm and a length of 2.5-4m, with a row spacing of 1.2m×1.5m. Apply an initial preload of 100-150kN (achieved through a preload multiplier, with a preload time >30min).

[0021] Anchor cable configuration: auxiliary anchor cables with a diameter of 17.8-21.8mm and a length of 6-8m are used, with a preload of 200kN or more (achieved through high preload locking devices), and resin anchoring agent (bonding strength >10MPa) is used at the anchoring end.

[0022] Furthermore, the depressurization in the depressurization zone can be achieved by constructing inclined blasting boreholes (94mm in diameter, 45°-75° angle, and 15-50m depth) 100-200m ahead of the roadway outside the depressurization zone. The blasting parameters include a single-hole charge of 0.5-1.0kg / meter, the use of emulsion explosives, and a millisecond delay blast (interval of 25-50ms) to form a pre-crack network (crack spacing of 0.5-1.0m).

[0023] The stress relief effect was verified by microseismic monitoring and borehole television imaging after blasting, ensuring that the surrounding rock stress was reduced by 20%-40% and the fracture propagation rate was <10%.

[0024] Numerical simulations have verified that, under typical deep coal roadway conditions (800m depth, 5m width), roadway convergence deformation is reduced to 8%-12%, and support costs are reduced by 15%, which is significantly better than traditional methods.

[0025] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for hydraulic fracturing and roof cutting to relieve pressure in a coal mine production line, characterized in that, include: Obtain geological exploration data of the surrounding rock of the tunnel, and construct a geological model based on the geological exploration data of the tunnel; Based on the geological model, the surrounding rock of the tunnel is divided into an anchoring zone and a pressure relief zone; The anchoring zone and the pressure relief zone are alternately controlled using preset control parameters.

2. The hydraulic fracturing and roof-cutting depressurization method for coal mine production lines as described in claim 1, characterized in that, The method of alternately controlling the anchoring zone and the pressure relief zone using preset control parameters includes: The anchoring zone and the pressure relief zone are alternately divided to obtain the roadway surrounding rock control sequence; Based on the control sequence of the surrounding rock of the roadway, the anchoring zone is subjected to high pre-tightening strong support and the decompression zone is subjected to blasting decompression.

3. A processing device, characterized in that, It includes at least one processor and at least one memory communicatively connected to the processor, wherein: the memory stores program instructions executable by the processor, and the processor can execute the method as described in any one of claims 1-2 by invoking the program instructions.

4. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause the computer to perform the method as described in any one of claims 1-2.

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