Integrated support method for gob-side entry driving with double roadway layout and coal mining method with multi-functional use of single roadway

Abstract

The present invention relates to the field of coal mining, and in particular to an integrated support for gob-side entry driving with double roadway layout and a coal mining method with multi-functional use of one roadway. In combination with the limitations of the existing double roadway driving technology for working faces with extremely long advancing distances and the limitation that the gob-side entry driving technology results in isolated working faces due to skip mining, which cannot guarantee the efficient production of the working face. An integrated support for gob-side entry driving with double roadway layout and a coal mining method with multi-functional use of one roadway are proposed. The present invention is applicable to mining areas with relatively large coal seam thicknesses, and the coal mining roadways can be longitudinally arranged with "one high, one low, and horizontal stagger"; in mines with relatively hard coal quality, high gas content, and dynamic disaster problems in the coal seam and roof, the function of "multi-functional use of one roadway" can be fully realized. This method achieves the following effects: improving the recovery rate of coal resources in the mine; facilitating roadway maintenance; the gob-side entry driving along the roof can be used as a pressure relief roadway, a gas drainage roadway, or to realize functions such as weakening the top coal according to the actual situation of the mine, achieving the effect of "multi-functional use of one roadway" for the gob-side entry driving along the roof.

Description

Technical Field

[0001] The present invention relates to the field of coal mining, and in particular to an integrated support for gob-side entry driving with double roadway layout and a coal mining method with multi-purpose use of one roadway. Background Art

[0002] A gob-side roadway is a roadway driven along the goaf of the upper section working face. Gob-side entry driving has the characteristics of high coal recovery rate, easy maintenance and driving of the roadway, and is widely promoted and used in China. This technology has been successfully applied in mines under conventional and complex conditions such as isolated working faces, deep coal seam groups, and impact-prone coal seams, including thin, medium-thick, and thick coal seams. However, if the gob-side entry driving technology is adopted, the movement of the overlying strata usually lasts for 1 year or even longer. Therefore, skip mining is required, that is, first mining the coal seam at a long distance, and then returning to mine the adjacent goaf area after the overlying strata of the goaf are stable. If direct continuous mining is carried out, that is, directly driving the gob-side roadway along the goaf of the previous working face and carrying out coal mining, it will be affected by the movement of the overlying strata of the previous goaf, and it is difficult to ensure the safety of the gob-side roadway.

[0003] An extra-long advancing distance working face usually refers to a working face advancing a distance of kilometers or more along the strike. And within a certain range, extending the advancing distance of the working face can achieve high-yield and high-efficiency production of the underground working face, achieving the effect of increasing efficiency and reducing the number of employees, which is conducive to promoting the development of highly concentrated coal mine production. However, when the advancing distance is too long, it is difficult for the air duct and the local fan to meet the underground ventilation requirements; and the material transportation also gradually becomes difficult. By adopting the double roadway driving technology, the problems of ventilation and auxiliary transportation can be solved. During the double roadway driving process, a coal pillar with a relatively large size needs to be left between the two coal mining roadways. This coal pillar is affected by the mining of the first working face and then has to serve the second working face. Therefore, considering the influence of multiple mining movements, a coal pillar of 30 m or even a larger size is left between the double roadway drivings, resulting in problems such as reduced coal recovery rate in the mining area and a large amount of coal loss.

[0004] In summary, for the double roadway driving technology of an extra-long advancing distance working face, a coal pillar with a suitable size needs to be left. If the coal pillar is left too large, although the normal use of the roadway can be ensured, problems such as a large amount of coal loss and serious coal damage will occur; if a coal pillar with a smaller size is left, the coal recovery rate of coal resources is improved to a certain extent, but due to the influence of multiple mining movements on the roadway, the maintenance difficulty of the roadway during driving and coal mining is extremely large, and even the roadway cannot be used normally, hindering the efficient production underground. If the gob-side entry driving technology is adopted, skip mining is required, which is likely to result in isolated working faces and cannot ensure the ventilation and transportation of materials.

[0005] In summary, aiming at the problems of long advancing distance and double - roadway layout and driving difficulties commonly existing in modern large mines, and the gob - side entry driving technology cannot be applied to the mining of long - advancing - distance working faces. Therefore, based on the above problems, this invention patent aims to form technological innovation and achieve the goals of "continuous" and "sequential" mining. It proposes an integrated support for gob - side entry driving with double - roadway layout and a coal - winning method with multiple uses of one roadway. The coal - winning method successfully solves the problems of large - size coal pillars left during the traditional double - roadway layout to ensure the safe, high - yield and efficient service of roadways, resulting in serious coal loss and a large amount of lost coal; changes the limitation that gob - side roadways need to adopt skip mining; the gob - side auxiliary roadway and the gob - side roadway can form combined anchoring, which is conducive to roadway maintenance; and the auxiliary roadway can be continuously used as the ventilation, auxiliary transportation roadway for the subsequent working face, or for pre - splitting the top coal, gas drainage, and pressure - relief process roadway for the top coal, achieving the goal of "multiple uses of one roadway". Summary of the Invention

[0006] Aiming at the above - mentioned technical problems, the purpose of the present invention is to propose an integrated support for gob - side entry driving with double - roadway layout and a coal - winning method with multiple uses of one roadway to solve the technical limitation problems existing in the prior art.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] a. On one side of the first - mined working face in a mining area or panel, double - roadway layout is adopted. A large - size coal pillar is reserved between the two roadways. The roadway closer to the working face is arranged along the coal seam floor, and the roadway farther from the working face is arranged along the coal seam roof. A connecting roadway is provided between the floor roadway and the roof roadway.

[0009] b. The connecting roadway is arranged at angles of 3°, 6°, 9°, 12°, 15° (n sections), 12°, 9°, 6°, 3° with the horizontal plane of the chute until the chute is horizontal, where the value of n is determined according to the specific difference between the coal seam thickness and the height of the roof roadway.

[0010] c. During the driving process of the floor roadway and the roof roadway on one side of the first - mined working face, the floor roadway undertakes the functions of intake air, driving and discharging coal and gangue, while the return air and feeding are completed by the roof roadway.

[0011] d. During the mining of the first - mined working face, double - roadways are arranged in the same way at the far end of the subsequent working face. After reaching the mining boundary, a cutting - eye is opened towards the first - mined working face. After reaching the gob - side entry driving position, it drives in the opposite direction towards the up - hill or main roadway side following the first - mined working face. During the driving process, a connecting roadway is arranged with the roof auxiliary transportation roadway of the first - mined working face. The layout scheme of the connecting roadway refers to patent protection right b. The coal mined from the gob - side entry driving is transported to the roof auxiliary transportation roadway through the connecting roadway or transported out from the other roadway along the cutting - eye.

[0012] e. By utilizing the spatial relationship of "one high, one low, and horizontal stagger" between the gob-side entry driving roadway and the roof-following auxiliary transportation roadway, the combined support of the two roadways is realized to ensure the stability of the gob-side entry driving roadway and the roof-following auxiliary transportation roadway during the mining of the subsequent working face.

[0013] f. During the mining of the subsequent working face, the roof-following auxiliary transportation roadway of the first mining working face can be used continuously as a ventilation roadway, an auxiliary transportation roadway, or a roadway for processes such as top coal weakening, gas drainage, and pressure relief, thus realizing "one roadway with multiple uses".

[0014] According to the method of the present invention, preferably, it is applicable to the integrated support of gob-side entry driving and the mining method of one roadway with multiple uses for double roadway layout.

[0015] Specifically, in step a, double roadways are arranged on one side of the first mining working face in the mining area or panel. A large-sized coal pillar is reserved between the double roadways. The roadway close to the working face is arranged along the coal seam floor, and the roadway far from the working face is arranged along the coal seam roof. A connecting roadway is provided between the floor roadway and the roof roadway.

[0016] In step b, the connecting roadway is arranged at angles of 3°, 6°, 9°, 12°, 15° (n sections), 12°, 9°, 6°, 3° with the horizontal plane of the chute until the chute remains horizontal, where the value of n is determined according to the specific situation of the difference between the coal seam thickness and the height of the roof roadway.

[0017] In step c, during the driving process of the floor roadway and the roof roadway on one side of the first mining working face, the floor roadway undertakes the functions of intake air and discharging coal and gangue during driving, while the return air and feeding are completed by the roof roadway.

[0018] In step d, during the mining of the first mining working face, double roadways are arranged in the same way at the far end of the subsequent working face. After reaching the mining boundary, a cutting eye is opened towards the first mining working face. After reaching the gob-side entry driving position, it is driven reversely towards the uphill or main roadway side following the first mining working face. During the driving process, a connecting roadway is arranged with the roof-following auxiliary transportation roadway of the first mining working face. The layout scheme of the connecting roadway refers to patent protection right b. The coal discharged from the gob-side entry driving is transported to the roof-following auxiliary transportation roadway through the connecting roadway or transported out from the other roadway along the cutting eye.

[0019] In step e, by utilizing the spatial relationship of "one high, one low, and horizontal stagger" between the gob-side entry driving roadway and the roof-following auxiliary transportation roadway, the combined support of the two roadways is realized to ensure the stability of the gob-side entry driving roadway and the roof-following auxiliary transportation roadway during the mining of the subsequent working face.

[0020] In step f, during the mining of the subsequent working face, the roof-following auxiliary transportation roadway of the first mining working face can be used continuously as a ventilation roadway, an auxiliary transportation roadway, or a roadway for processes such as top coal weakening, gas drainage, and pressure relief, thus realizing "one roadway with multiple uses".

[0021] Compared with the prior art, the integrated support for gob-side entry driving with double roadway layout and the coal mining method with multi-purpose use of one roadway provided by the present invention have the following advantages:

[0022] (1) The coal recovery rate is high. The gob-side entry driving technology is formed between the final working faces, and the size of the coal pillar is significantly better than that of the traditional double roadway layout and driving; by using the auxiliary roadway arranged along the top of the coal seam to play the role of "roof coal pressure relief", etc., the recovery rate of the top coal can be significantly improved.

[0023] (2) It is beneficial to roadway support. By using the spatial relationship between the gob-side entry driving roadway and the auxiliary roadway along the top, the combined support effect of one side of the roadway along the top and the roof of the roadway along the bottom can be realized, which is significantly better than the single roadway roof maintenance effect of the roadway arranged along the bottom.

[0024] (3) Ensure underground safety production. By using the roadway along the top measure, the end and the top coal can be pressure-relieved in advance; in high-gas mines, this roadway can be used as a gas drainage roadway, and this technology can comprehensively solve the safety mining problems of coal seams with dynamic disasters, high gas, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of double roadway layout for working face with ultra-long advancing distance in the prior art

[0026] Figure 2 Schematic diagram of coal mining with double roadway layout on one side of the coal mining face and the subsequent working face of the mining method of the present invention

[0027] Figure 3 Schematic diagram of A-A cross-section of double roadway layout on one side of the coal mining face and the subsequent working face of the mining method of the present invention DETAILED DESCRIPTION OF THE INVENTION

[0028] The specific embodiments of the present invention will be described with reference to the accompanying drawings.

[0029] In this embodiment, in the first step, double roadways are arranged on one side of the first mining working face in the mining area or panel. A large-sized coal pillar is reserved between the double roadways. The roadway close to the working face is arranged along the bottom of the coal seam, and the roadway far from the working face is arranged along the top of the coal seam. There is a connecting roadway between the roadway along the bottom and the roadway along the top.

[0030] In the second step, the connecting roadway is arranged at angles of 3°, 6°, 9°, 12°, 15° (n sections), 12°, 9°, 6°, 3° with the horizontal plane of the chute until the chute remains horizontal, where the value of n is determined according to the specific situation of the difference between the coal seam thickness and the height of the roadway along the top.

[0031] In the third step, during the driving process of the roadway along the bottom and the roadway along the top on one side of the first mining working face, the roadway along the bottom undertakes the functions of intake air, driving and discharging coal and gangue, and the return air and feeding are completed by the roadway along the top.

[0032] The fourth step is that during the mining of the first mining face, double tunnels are arranged in the same way at the far end of the subsequent working face. After reaching the mining boundary, a cut is made in the direction of the first mining face. After reaching the position of the tunnel along the goaf, the first mining face is pursued in the opposite direction to advance uphill or to the side of the main tunnel. During the excavation process, a connecting tunnel is arranged with the auxiliary transportation tunnel along the top of the first mining face. The layout plan of the connecting tunnel refers to patent protection right b. Coal is discharged from the tunnel along the goaf through the connecting tunnel to the auxiliary transportation tunnel along the top or transported out from the tunnel on the other side along the cut.

[0033] The fifth step is to utilize the spatial relationship of "one high, one low, and horizontally staggered" between the roadway along the goaf and the auxiliary transport roadway along the top to achieve joint support of the two roadways and ensure the stability of the roadway along the goaf and the auxiliary transport roadway along the top during the mining of the subsequent working face.

[0034] The sixth step is that during the mining of the subsequent working face, the auxiliary transportation tunnels along the top of the first mining working face can continue to be used as ventilation, auxiliary transportation, or to achieve top coal weakening, gas extraction, pressure unloading and other process tunnels, thus realizing "one tunnel for multiple uses".

Claims

1. An integrated support method for gob-side entry driving with double roadway layout and a coal mining method with multi-purpose use of one roadway is realized. It is characterized in that: It includes the following processes: a. Double roadway layout is adopted on one side of the first mining face in the mining area or panel. A large-sized coal pillar is reserved between the double roadways. The roadway close to the working face is arranged along the coal seam floor, and the roadway far from the working face is arranged along the coal seam roof. A connecting roadway is provided between the floor roadway and the roof roadway. b. The connecting roadway is arranged according to the chute angles with the horizontal plane of 3°, 6°, 9°, 12°, 15° (n sections), 12°, 9°, 6°, 3° until the chute is horizontal, where the value of n is determined according to the specific difference between the coal seam thickness and the height of the roof roadway. c. During the driving process of the floor roadway and the roof roadway on one side of the first mining face, the floor roadway undertakes the functions of intake air, driving and discharging coal and gangue, while the return air and feeding are completed by the roof roadway. d. During the mining of the first mining face, double roadways are arranged in the same way at the far end of the subsequent mining face. After reaching the mining boundary, a cutting eye is opened towards the first mining face. After reaching the gob-side entry driving position, it drives reversely towards the upper mountain or main roadway side following the first mining face. During the driving process, a connecting roadway is arranged with the roof auxiliary transportation roadway of the first mining face. The layout scheme of the connecting roadway refers to step b. The coal discharged from the gob-side entry driving is transported to the roof auxiliary transportation roadway through the connecting roadway or transported out from the other roadway along the cutting eye. e. By using the spatial relationship of "one high, one low, and horizontal stagger" between the gob-side entry driving roadway and the roof auxiliary transportation roadway, the combined support of the two roadways is realized to ensure the stability of the gob-side entry driving roadway and the roof auxiliary transportation roadway during the mining of the subsequent mining face. f. During the mining of the subsequent mining face, the roof auxiliary transportation roadway of the first mining face can be continuously used as a ventilation roadway, an auxiliary transportation roadway, or a roadway for realizing top coal weakening, gas drainage, and pressure relief technology, so as to realize "multi-purpose use of one roadway".

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