Coal mine panel mining optimization structure, ventilation optimization structure and comprehensive optimization system

Abstract

This invention discloses an optimized structure for coal mine panel mining, an optimized structure for ventilation, and a comprehensive optimization system. The coal mine panel is divided into a northern panel, a central panel, and a southern panel. The system roadway group in the northern panel is arranged along the strike within the stress relief zone formed by the goaf of the working face in the central panel. The system roadways in the northern panel are configured as strike longwalls, allowing the working face in the northern panel to be arranged along the dip of the coal seam and advance along the strike, and to be arranged along the serrated boundary line of the mine boundary. The system roadway group in the southern panel is arranged along the dip within the stress relief zone formed by the goaf of the adjacent panel. This invention achieves the technical effects of reducing maintenance costs, increasing resource recovery rate, reducing the amount of mine roadway engineering, and ensuring mining succession by adjusting the panel layout, combining strike and inclined longwalls, coordinating stress relief arrangement, resource recovery, and constructing an independent zoned ventilation system. It overcomes the limitations of existing technologies that can only solve single problems and cannot adapt to changes in the mine boundary.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, specifically to optimized structures for coal mine panel mining, optimized ventilation structures, and integrated optimization systems. Background Technology

[0002] Coal mining in East my country has generally entered the deep mining stage, with the number of wells reaching depths of over 1,000 meters increasing year by year. Deep mining faces a series of technical challenges, including high ground pressure, strong disturbance, and high ventilation resistance. Meanwhile, with the integration of mineral resources and adjustments to overall mining area planning, changes in mining rights have become commonplace.

[0003] Zhujidong Coal Mine, a typical deep mine (mining depth exceeding 900 meters), originally had its East 3C coal seam panel designed in three phases between 2018 and 2022, including the central panel (2018), the northern panel (2021), and the southern panel (2022). However, in July 2024, the group company adjusted the mining rights scope of Zhujidong Coal Mine and Pan'er Coal Mine, adjusting the southern boundary of Zhujidong Coal Mine to the F72 fault, and correspondingly expanding the scope of the East 3 panel. Simultaneously, according to the revised Panxie Mining Area Master Plan, Zhujidong Coal Mine plans to expand its boundary eastward, incorporating the area north of the F66 fault (shallow to 1200m) in the original Panxie peripheral exploration area into the mining field. Against this backdrop, the original panel design scheme faces the following technical problems:

[0004] 1. The original development and mining layout does not match the changed mining boundary. The original design for the northern panel adopted an inclined longwall layout, with the system roadways located near the F207 reverse fault and situated in solid coal sections. This resulted in significant roadway pressure and high maintenance requirements. Furthermore, the original design included protective coal pillars for the system roadways, which hindered early resource recovery. Currently, the eastern boundary of the minefield is serrated, and the inclined longwall layout is unfavorable for the recovery of triangular coal resources at this serrated boundary.

[0005] 2. Bottlenecks exist in the ventilation system of the housing complex. The central panel of the East 3C coal seam, which was developed in the early stage, has its return air mains rooted in the -895m east wing return air main and the -880m east return air main, while its track main is rooted in the -906m east track main. Among them, the -895m east wing return air main and the -880m east return air main serve as the main return air mains of the mine's east wing, serving both the East 21-2 and East 23-1 coal seam panels, and will later also serve the northern panel of the East 3C coal seam. This results in problems such as high ventilation resistance and insufficient ventilation capacity, and does not meet the requirements of coal mine safety regulations regarding zoned ventilation.

[0006] 3. Limitations of existing technology A search revealed existing technologies that utilize the stress relief zone of a goaf for roadway layout. For example, patent CN114233331A discloses a "method for preventing rockbursts by arranging stress relief roadway groups in coal seam panels." This method involves pre-mining the top layer of the coal seam to create a top-layer goaf, and then arranging the panel roadway group below the top-layer goaf, thus placing the roadways in a low-stress state. This technology primarily addresses the problem of rockburst prevention but does not address the dynamic adjustment of the layout after mine boundary changes or the optimization of resource recovery.

[0007] Another patent, CN115653620A, discloses a "method for preventing rockbursts and mine tremors through a combined preparation method for mining panels." This method employs a combined arrangement of upper and lower coal seams, utilizing the top drainage roadway within the upper coal seam for gas extraction. After the lower coal seam is mined, a mining panel is placed at the corresponding location in the upper coal seam. This technology primarily addresses the problems of rockburst, mine tremors, and gas control. However, it involves a three-dimensional combination of upper and lower coal seams and does not address the layout optimization between different panels within the same coal seam, nor does it consider the dynamic adaptability to changes in mine boundaries.

[0008] In summary, how to balance deep well ground pressure control, maximum resource recovery, and ventilation system optimization under changing mining conditions is a pressing technical challenge that needs to be addressed. Summary of the Invention

[0009] The technical problem to be solved by this invention is: how to balance deep well ground pressure control, resource recovery maximization, and ventilation system optimization under changing mining conditions.

[0010] To solve the above-mentioned technical problems, the present invention provides the following technical solution: The optimized structure of coal mine panel mining divides the coal mine panel into northern, central, and southern panels; The system roadway group of the northern panel is arranged along the strike within the pressure relief zone formed by the goaf of the working face of the central panel. The system roadway group includes the main track roadway, the conveyor belt roadway, and the return air roadway. The system roadways in the northern panel are configured with strike longwalls, so that the working faces in the northern panel are arranged along the dip of the coal seam and advance along the strike, and the working faces are arranged along the serrated boundary line of the mine boundary in a strike manner. The system roadway group in the southern panel is arranged along the dip within the pressure relief zone formed by the goaf of the adjacent panel working face.

[0011] As a further aspect of the present invention: the system roadway group acting on the central panel adopts an inclined longwall arrangement.

[0012] As a further aspect of the present invention: the system roadway group acting on the southern panel adopts an inclined longwall arrangement.

[0013] As a further aspect of the present invention: the extension direction of the system roadways in the northern panel is consistent with the direction of the main ground stress.

[0014] As a further aspect of the present invention: the northern panel is divided into multiple sections along the dip of the coal seam, and a coal mining face is arranged in each section. The transport roadway, return air roadway and track roadway of each section are respectively connected to the main roadway of the conveyor belt, the return air roadway and the track roadway of the panel.

[0015] As a further aspect of the present invention: the main track roadways of the northern panel, the central panel, and the southern panel are interconnected; the main conveyor roadways of the northern panel, the central panel, and the southern panel are interconnected; and the return air roadways of the northern panel, the central panel, and the southern panel are interconnected.

[0016] The present invention also discloses a ventilation optimization structure for coal mine panels, which is applied to the coal mine panel mining optimization structure as described above, including a return air system; The return air system includes two intake airways and four return airways, of which two return airways can serve adjacent coal seam panels; the remaining two intake airways and two return airways serve the northern panel, the central panel, and the southern panel. Among them, the intake and return airways that affect adjacent panels are independent of the intake and return airways that affect the northern, central, and southern panels.

[0017] As a further aspect of the present invention: the two return air mains acting on the adjacent coal seam panel include the -895m east wing return air main and the -880m east return air main.

[0018] As a further aspect of the present invention: the two intake airways and two return airways acting on the northern panel, the central panel and the southern panel include the East Wing No. 8 Coal Mine Roof Return Airway, the East Wing No. 13-1 Coal Mine Return Airway, the -906m East Track Roadway and the -906m East Auxiliary Track Roadway.

[0019] The present invention also discloses a coal mine panel comprehensive optimization system, including the coal mine panel mining optimization structure and / or the coal mine panel ventilation optimization structure.

[0020] Compared with the prior art, the beneficial effects of the present invention are: 1. This application adjusts the layout of the northern panel from the current inclined longwall to strike longwall, so that its system roadways are arranged in an east-west direction. After the adjustment, the working face of the northern panel is arranged along the sawtooth boundary line of the existing eastern boundary of the mine, which is used to recover the triangular coal resources at the sawtooth boundary after the mine boundary is further expanded. 2. In this application, the system roadways of the northern panel are arranged in the stress relief zone formed by the goaf of the working face of the central panel. At the same time, the extension direction of the system roadways of the northern panel is consistent with the direction of the main ground stress, so as to minimize the impact of ground pressure and reduce the cost of roadway support and maintenance. 3. This application incorporates the 1312(1) working face and the existing system roadways of the original southern panel into the central panel, so that the central panel can use the existing system roadways to start production in a timely manner and alleviate the tension of mining succession. 4. By designating the -895m East Wing Return Air Main Roadway and the -880m East Return Air Main Roadway as dedicated return air main roads for the East No. 2 Coal Seam Panel, and no longer serving the East No. 3 Panel, physical isolation of the ventilation systems of the East No. 2 Panel and the East No. 3 Panel was achieved. The outer perimeter of the East Second panel features a "three-in, three-out" ventilation pattern, while the outer perimeter of the East Third panel features a "four-in, two-out" ventilation pattern. Each panel's main intake and return air systems are relatively independent, achieving zoned ventilation and avoiding safety hazards such as high ventilation resistance and insufficient airflow. Under this independent zoned ventilation pattern, ventilation failures in individual panels (such as localized gas anomalies or fires) will not affect each other, significantly improving the overall stability and disaster resistance of the mine's ventilation system. This effect is particularly important under conditions of deep-well mining and high gas emission volumes. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the optimized structure for coal mine panel mining according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the optimized ventilation structure for coal mine panels according to an embodiment of the present invention; Explanation of reference numerals in the attached figures: 1. North District Coal Bottom Return Air Main Roadway; 2. North District Coal Bottom Track Main Roadway; 3. North District Coal Bottom Belt Conveyor Main Roadway; 4. East Wing No. 8 Coal Mine Roof Return Air Main Roadway; 5. -895m East Wing Return Air Main Roadway; 6. -880m East Wing Return Air Main Roadway; 7. East No. 2 Belt Conveyor Main Roadway; 8. -906m East Track Main Roadway; 9. East No. 13-1 Coal Mine Return Air Main Roadway; 10. -906m East Auxiliary Track Main Roadway; 11. South District Coal Bottom Track Main Roadway; 12. South District Coal Bottom Track Main Roadway; 13. South District Coal Bottom Track Main Roadway; 14. Central Coal Bottom Return Air Main Roadway; 15. Central Coal Bottom Return Air Main Roadway; 16. Central Coal Bottom Return Air Main Roadway. Detailed Implementation

[0022] 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.

[0023] Example 1 An optimized mining structure for coal mine panels, which re-divides the original panel into a northern panel, a central panel, and a southern panel based on the new mining boundary after the change of mining rights; Reference Figure 1 The southern boundary of the northern panel is adjusted to the track roadway of the 1321(1) working face, and the northern boundary is adjusted to the track roadway of the 1343(1) working face; the middle part also includes the track roadway of the 1353(1) working face and the track roadway of the 1311(1) working face.

[0024] The system roadways in the northern panel include the northern coal seam return airway 1, the northern coal seam track roadway 2, and the northern coal seam track roadway 3. The northern coal seam return airway 1, the northern coal seam track roadway 2, and the northern coal seam track roadway 3 are arranged with strike longwalls, so that the working faces in the northern panel are arranged along the dip of the coal seam and advance along the strike, and the working faces are arranged along the serrated boundary line of the mine boundary, so as to recover the triangular coal resources at the serrated boundary after the mine boundary is further expanded.

[0025] The system roadway group serving the northern panel (i.e., the northern coal seam return air main roadway 1, the northern coal seam track main roadway 2, and the northern coal seam track main roadway 3) is arranged along its strike within the pressure relief zone formed by the goaf of the central panel working face. By adjusting the northern panel system roadways to the pressure relief zone of the central panel goaf, the protective coal pillars left below the original northern panel system roadways can be recovered in advance. After the southern panel development is temporarily suspended, the coal pillar resources of its system roadways can also be recovered in advance. This effect reflects the unique design concept of synergistic pressure relief arrangement and resource recovery, breaking through the limitation of existing technologies that only focus on pressure relief and disaster prevention.

[0026] Reference Figure 1 The southern boundary of the central panel area is adjusted to the track roadway of the 1312 (1) working face, and the northern boundary is adjusted to the track roadway of the 1321 (1) working face. The middle part also includes the track roadway of the 1331 (1) working face.

[0027] The roadways in the central panel include the central coal seam return airway 14, the central coal seam return airway 15, and the north-central coal seam return airway 16. The north coal seam return airway 1, the north coal seam track roadway 2, and the north coal seam track roadway 3 are arranged in an inclined longwall configuration, allowing the working faces in the central panel to be positioned along the coal seam strike and advance along the dip. The roadways utilize the existing roadways from the central and southern panels. A total of three working faces are divided along the coal seam strike.

[0028] Reference Figure 1 The northern boundary of the southern panel area was adjusted to the transport roadway of the 1312 (1) working face, and the southern boundary was adjusted to the new boundary line of the new well field.

[0029] The system roadways in the southern panel include the South Coal Bottom Track Roadway 11, South Coal Bottom Track Roadway 12, and South Coal Bottom Track Roadway 13. The South Coal Bottom Track Roadway 11, South Coal Bottom Track Roadway 12, and South Coal Bottom Track Roadway 13 are arranged in an inclined longwall configuration. The system roadways are arranged in a north-south direction within the pressure relief zone formed by the goaf of the adjacent panel working face, and are divided into 3 working faces along the coal seam strike.

[0030] Among them, the North Coal Bottom Plate Return Air Main Roadway 1, the Central Coal Bottom Plate Return Air Main Roadway 14, and the South Coal Bottom Plate Track Main Roadway 13 are interconnected; the North Coal Bottom Plate Track Main Roadway 2, the North-Central Coal Bottom Plate Return Air Main Roadway 16, and the South Coal Bottom Plate Track Main Roadway 11 are interconnected; the North Coal Bottom Plate Track Main Roadway 3, the Central Coal Bottom Plate Return Air Main Roadway 15, and the South Coal Bottom Plate Track Main Roadway 12 are interconnected.

[0031] For ease of understanding and description, the directions "east, south, west, north" in the text are... Figure 1 Based on this, all other orientations are deduced from this. It should be understood that this orientation setting is only for the convenience of description and understanding, and should not be construed as a limitation of this application.

[0032] Example 2 Based on Example 1, this example protects a ventilation optimization structure for a coal mine panel. According to the current long-term plan for mining succession and disaster management of Zhujidong Coal Mine, the mine's mining area is concentrated in the east wing, with high mining intensity. The East Third Coal Seam Panel is the main production panel, with two coal mining faces operating simultaneously. Due to the high mining intensity, sufficient air volume must be provided to meet the needs of safe production.

[0033] Reference Figure 2In addition, the east wing of the mine successively added the -906m eastern auxiliary track roadway 10, the east wing 8 coal seam roof return air roadway 4, and the east 13-1 coal seam return air roadway 9. Thus, the east wing of the mine now has two main intake air roadways and four return air roadways leading to the East 3C coal seam panel: the -906m eastern track roadway 8, the -906m eastern auxiliary track roadway 10, the -895m east wing return air roadway 5, the -880m eastern return air roadway 6, the east wing 8 coal seam roof return air roadway 4, and the east 13-1 coal seam return air roadway 9. Among these, the -895m east wing return air roadway... 5. The -880m eastern return air main roadway 6 and the eastern wing 8 coal roof return air main roadway 4 are both connected to the northern coal floor return air main roadway 1; the -906m eastern track main roadway 8 is connected to the northern coal floor track main roadway 2; the eastern 13-1 coal return air main roadway 9 is also connected to the northern coal floor return air main roadway 1; the -906m eastern auxiliary track main roadway 10 is connected to the northern coal floor track main roadway 2; the eastern second conveyor belt main roadway 7 is located between the -880m eastern return air main roadway 6 and the -906m eastern track main roadway 8, and the eastern second conveyor belt main roadway 7 is connected to the northern coal floor conveyor belt main roadway.

[0034] Reference Figure 2 To ensure the stability and reliability of the ventilation system in the east wing of the mine, while also achieving zoned ventilation for each panel, the design of the ventilation system in the east wing of the mine was optimized and adjusted. Specifically, the -895m east wing return air main roadway 5 and the -880m east return air main roadway 6 are dedicated return air roadways for the 11-2 and 13-1 coal seam panels of East No. 2, respectively, and no longer serve the East No. 3 panel. The roof return air main roadway 4 of East No. 8 coal seam and the return air main roadway 9 of East No. 13-1 coal seam are independent return air systems, serving the northern, central and southern coal seam panels of East No. 3.

[0035] The independent return air system utilizes the newly added East Wing No. 8 coal seam roof return air main roadway 4 and East 13-1 coal seam return air main roadway 9 in the East Wing of the mine. Together with the -906m East Track Main Roadway 8 and the -906m East Auxiliary Track Main Roadway 10, it forms an intake air channel serving the East No. 3 coal seam panel. It also utilizes the return air section of East Wing No. 8 coal seam roof return air main roadway 4 and the return air section of East 13-1 coal seam return air main roadway 9 to form a return air channel serving the East No. 3 coal seam panel.

[0036] The dedicated return airways serving the East Second Coal Seam Panel include the -895m East Wing Return Airway 5 and the -880m East Return Airway 6, which serve as dedicated return airways for the East Second Coal Seam Panel and do not serve the East Third Panel. The outer perimeter of the East Second panel forms a "three-in, three-out" ventilation pattern (three inlets: -885m Eastern Track Main Roadway (not shown in the figure), -965m Eastern Track Main Roadway (not shown in the figure), East Wing Conveyor Belt Main Roadway (not shown in the figure); three outlets: -906m East Wing North Return Air Main Roadway (not shown in the figure), -906m East Wing South Return Air Main Roadway (not shown in the figure), East Wing No. 8 Coal Mine Roof Return Air Main Roadway 4). The outer perimeter of the East Third panel forms a "four-in, two-out" ventilation pattern (four inlets: -906m Eastern Track Main Roadway 8, -906m Eastern Auxiliary Track Main Roadway 10, East Second Conveyor Belt Main Roadway (not shown in the figure), -885m Gangue Conveyor Belt Main Roadway (not shown in the figure); two outlets: East Wing No. 8 Coal Mine Roof Return Air Main Roadway 4 and East 13-1 Coal Mine Return Air Main Roadway 9). The intake and return air systems of each panel are independent of each other.

[0037] Example 2 also includes the -965m eastern track roadway, which serves the deep tunneling face of the East Second Coal Seam Panel, and its air intake system is independent of the ventilation system of the East Third Coal Seam Panel at the -906m level.

[0038] The working face of the northern panel in this application is arranged along the existing eastern boundary of the mine. After the mine boundary is expanded eastward, all resources at the sawtooth boundary can be recovered, reducing the occurrence of "triangular coal" and recovering the coal pillar resources of the original northern panel system roadways ahead of schedule, resulting in the recovery of approximately 6 million tons of additional coal resources from the East C group. Development of the southern panel will be temporarily suspended. The area of ​​the East 1 South panel can be expanded to the east side of the East 3 South panel system roadways, allowing for the recovery of approximately 1.3 million tons of coal pillar resources from the system roadways ahead of schedule. After the mine boundary is expanded eastward, the East 3 North panel system roadways will be extended further eastward to serve the expanded East 3 East panel, reducing the amount of shaft and tunnel engineering by approximately 5,000 meters.

[0039] Example 3 This application protects a comprehensive optimization system for a coal mine panel, which includes the coal mine panel mining optimization structure of Embodiment 1 and the coal mine panel ventilation optimization structure of Embodiment 2.

[0040] 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. An optimized structure for coal mine panel mining, characterized in that, The coal mine panel is divided into the northern panel, the central panel, and the southern panel; The system roadway group of the northern panel is arranged along the strike within the pressure relief zone formed by the goaf of the working face of the central panel. The system roadway group includes the main track roadway, the conveyor belt roadway, and the return air roadway. The system roadways in the northern panel are configured with strike longwalls, so that the working faces in the northern panel are arranged along the dip of the coal seam and advance along the strike, and the working faces are arranged along the serrated boundary line of the mine boundary in a strike manner. The system roadway group in the southern panel is arranged along the dip within the pressure relief zone formed by the goaf of the adjacent panel working face.

2. The optimized structure for coal mine panel mining according to claim 1, characterized in that: The system roadway group that acts on the central panel adopts an inclined longwall arrangement.

3. The optimized structure for coal mine panel mining according to claim 1, characterized in that: The system roadway group that acts on the southern panel adopts an inclined longwall arrangement.

4. The optimized structure for coal mine panel mining according to claim 1, characterized in that: The direction of the system roadways in the northern panel is consistent with the direction of the main ground stress.

5. The optimized structure for coal mine panel mining according to claim 1, characterized in that: The northern panel is divided into multiple sections along the dip of the coal seam. Each section has a coal mining face. The transport roadway, return air roadway, and track roadway of each section are connected to the main roadway of the conveyor belt, the return air roadway, and the track roadway of the panel, respectively.

6. The optimized structure for coal mine panel mining according to claim 1, characterized in that: The main track roadways of the northern, central, and southern panels are interconnected; the main conveyor roadways of the northern, central, and southern panels are interconnected; and the return air roadways of the northern, central, and southern panels are interconnected.

7. A structure for optimizing ventilation in a coal mine panel, characterized in that, The optimization structure for coal mine panel mining as described in any one of claims 1-6 includes a return air system; The return air system includes two intake airways and four return airways, of which two return airways can serve adjacent coal seam panels; the remaining two intake airways and two return airways serve the northern panel, the central panel, and the southern panel. Among them, the intake and return airways that affect adjacent panels are independent of the intake and return airways that affect the northern, central, and southern panels.

8. The optimized ventilation structure for coal mine panels according to claim 7, characterized in that: The two return airways that affect the adjacent coal seam panel include the -895m East Wing Return Airway (5) and the -880m East Return Airway (6).

9. The optimized ventilation structure for coal mine panels according to claim 7, characterized in that: The two intake airways and two return airways that affect the northern, central and southern panels include the East Wing No. 8 Coal Mine Roof Return Airway (4), the East 13-1 Coal Mine Return Airway (9), the -906m East Track Roadway (8) and the -906m East Auxiliary Track Roadway (10).

10. A comprehensive optimization system for coal mine panels, characterized in that, Includes the coal mine panel mining optimization structure as described in any one of claims 1-6 and / or the coal mine panel ventilation optimization structure as described in any one of claims 7-9.

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