Steeply inclined coal seam crossing roadway single wing mining method

Abstract

The steeply inclined coal seam cross-road single-wing mining method of the present application comprises the following steps: dividing the coal seam into multiple mining sections in the up-down direction in turn, and dividing each mining section into multiple mining layers along the thickness direction of the coal seam; arranging a mining area transportation roadway and a mining area return air roadway below the coal seam floor; arranging an upper section return air main roadway, a lower section machine rail main roadway, a boundary return air raise, and a section return air raise below the coal seam floor; arranging an upper section yard roadway, an upper section cross-cut roadway, a lower section yard roadway, and a lower section cross-cut roadway along the horizontal direction; arranging a working face return air crossheading at the top of the mining layer; arranging a working face transportation crossheading at the bottom of the mining layer; and setting an initial coal mining working face in the mining layer through at least one of the working face return air crossheading and the working face transportation crossheading. Therefore, the steeply inclined coal seam cross-road single-wing mining method of the present application has the advantages of reducing the number of working face moving and face reversing, and improving the resource recovery rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mining, in particular to a cross-road single-wing mining method for steeply inclined coal seams. BACKGROUND

[0002] Generally, the coal seam with an inclination angle of more than 45° is referred to as a steeply inclined coal seam, and the mining method of the steeply inclined coal seam is always a difficult problem in mining technology. The reserves of the steeply inclined coal seam account for 4% of the total coal reserves in China, and 80% of the mining areas in the southern region have steeply inclined coal seams. Therefore, the research on the mining method of the steeply inclined coal seam plays a very important role in the sustainable development of the coal industry. In recent years, a large amount of research has been conducted on the fully-mechanized top coal mining technology under different large-inclination conditions in China, and certain achievements have been made in the research on the stability of the mining equipment, the fully-mechanized mining process parameters, and the mine pressure law. At present, the fully-mechanized mining technology for the large-inclination medium-thick coal seam with an inclination angle of 35° to 45° has been successful, and the steeply inclined coal seam mining technology has also been successfully tested in some mining areas. However, the steeply inclined longwall fully-mechanized mining face has complex coal seam occurrence conditions, and it is very difficult to determine the mining process and ensure safety in production in the related technology. In addition, the face length is short, the recoverable reserves of a single face are small, the number of face moving and face reversing is large, the production cost is high, and the safety management is difficult. SUMMARY

[0003] The present application aims to at least partially solve one of the technical problems in the related art. To this end, an embodiment of the present application proposes a cross-road single-wing mining method for steeply inclined coal seams.

[0004] The cross-road single-wing mining method for steeply inclined coal seams according to the embodiment of the present application comprises the following steps:

[0005] The coal seam is sequentially divided into a plurality of mining sections along the up-down direction, and each mining section is divided into a plurality of mining layers along the thickness direction of the coal seam;

[0006] A mining area transportation roadway and a mining area return air roadway are arranged below the coal seam floor, and the mining area transportation roadway and the mining area return air roadway are both arranged downwardly inclined;

[0007] An upper section return air main roadway, a lower section machine rail main roadway, a boundary return air upraise, and a section return air upraise are arranged below the coal seam floor, the upper section return air main roadway and the lower section machine rail main roadway both extend along the strike of the coal seam, the upper section return air main roadway is located at the top of the mining section, the lower section machine rail main roadway is located at the bottom of the mining section, the boundary return air upraise and the section return air upraise are both arranged downwardly inclined, the upper section return air main roadway is communicated with the lower section machine rail main roadway through the boundary return air upraise, and the upper section return air main roadway and the lower section machine rail main roadway are communicated with the mining area return air roadway through the section return air upraise;

[0008] The upper section of the roadway and the upper section of the crosscut are located at the top of the mining section, and the lower section of the roadway and the lower section of the crosscut are located at the bottom of the mining section;

[0009] A working face return air crossheading is arranged at the top of the mining layer, the working face return air crossheading extends along the strike of the coal seam, the working face return air crossheading is communicated with the mining area transportation roadway through the upper section of the roadway, and the working face return air crossheading is communicated with the upper section of the return air roadway through the upper section of the crosscut;

[0010] A working face transportation crossheading is arranged at the bottom of the mining layer, the working face transportation crossheading extends along the strike of the coal seam, the working face transportation crossheading is communicated with the mining area transportation roadway through the lower section of the roadway, and the working face transportation crossheading is communicated with the lower section of the machine rail roadway through the lower section of the crosscut;

[0011] An initial coal mining working face is arranged in the mining layer through at least one of the working face return air crossheading and the working face transportation crossheading, and the mining layer is mined along the strike of the coal seam from the initial coal mining working face.

[0012] Therefore, the steeply inclined coal seam cross-road single-wing mining method has the advantages of reducing the number of working face moving and turning over and improving the resource recovery rate.

[0013] In some embodiments, the mining layer is divided into a plurality of mining faces along the strike of the coal seam, and each of the plurality of mining faces of the mining layer is mined in sequence along the strike of the coal seam, and the air supply path of the fresh air flow is adjusted according to the position of the mining face.

[0014] In some embodiments, the mining layer is divided into a first mining face and a second mining face, the boundary of the first mining face and the second mining face is adjacent to the lower section of the roadway in the strike of the coal seam, and the initial coal mining working face is located on the side of the first mining face away from the second mining face in the strike of the coal seam.

[0015] In some embodiments, the upper section of the roadway, the upper section of the crosscut, the lower section of the roadway and the lower section of the crosscut are located on the side of the boundary of the first mining face and the second mining face away from the initial coal mining working face;

[0016] When mining is performed in the first mining face, fresh air flows from the lower section depot roadway into the working face transportation crossheading, the coal mining face, the working face return air crossheading, the upper section crosscut, the upper section return air main roadway, the section return air upraise and the mining area return air roadway in turn;

[0017] When mining is performed in the second mining face, fresh air flows from the lower section depot roadway into the lower section machine rail main roadway, the lower section crosscut, the working face transportation crossheading, the coal mining face, the working face return air crossheading, the upper section crosscut, the upper section return air main roadway, the section return air upraise and the mining area return air roadway in turn.

[0018] In some embodiments, the first mining face is mined after the lower section machine rail main roadway is arranged;

[0019] Alternatively, the lower section machine rail main roadway is arranged after the first mining face is mined.

[0020] In some embodiments, each of the upper section return air main roadway, the lower section machine rail main roadway and the boundary return air upraise is greater than or equal to 25 meters away from the coal seam.

[0021] In some embodiments, the mining area transportation roadway includes a mining area main haulage roadway and a mining area auxiliary haulage roadway, both of which are arranged in a downward inclination, and the mining area auxiliary haulage roadway communicates with the upper section depot roadway and the lower section depot roadway;

[0022] In a cross section perpendicular to the up-and-down direction, the extension direction of the projection of the upper section depot roadway and the extension direction of the projection of the lower section depot roadway are both at an angle with the extension direction of the projection of the mining area auxiliary haulage roadway.

[0023] In some embodiments, each of the mining area return air roadway, the mining area main haulage roadway and the mining area auxiliary haulage roadway is greater than or equal to 35 meters away from the coal seam;

[0024] The mining area return air roadway, the mining area main haulage roadway, the mining area auxiliary haulage roadway, the boundary return air upraise and the section return air upraise are at an angle less than or equal to 25° with the horizontal plane;

[0025] The lower section depot roadway is provided with a transshipment coal bunker, which communicates with the mining area main haulage roadway.

[0026] In some embodiments, the lower section machine rail main roadway of one of the two adjacent mining sections located above constitutes at least part of the upper section return air main roadway of one of the two adjacent mining sections located below.

[0027] In some embodiments, the plurality of mining sections are mined in sequence from top to bottom, and the plurality of mining layers in each of the mining sections are mined in sequence from top to bottom. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a side view of coal mining according to an embodiment of the present application.

[0029] Figure 2 is a plan view of coal mining according to an embodiment of the present application.

[0030] Figure 3 is a plan view of coal mining according to an embodiment of the present application.

[0031] REFERENCE NUMERALS:

[0032] 1. Mining section, 11. Mining layer, 12. First mining face, 13. Second mining face;

[0033] 2. Mining area transportation roadway, 21. Mining area return air roadway, 22. Main mining area transportation roadway, 23. Auxiliary mining area transportation roadway;

[0034] 31. Upper section return air main roadway, 32. Lower section machine rail main roadway, 33. Boundary return air upgate, 34. Section return air upgate;

[0035] 41. Upper section yard roadway, 42. Upper section crosscut roadway, 43. Lower section yard roadway, 44. Lower section crosscut roadway, 45. Transshipment coal bunker;

[0036] 51. Working face return air entry, 52. Working face transportation entry, 53. Initial coal mining working face. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described in detail below with reference to the attached drawings. The embodiments described below are examples of the present application, and are intended to explain the present application, and should not be understood as limiting the present application.

[0038] A steeply inclined coal seam cross-road single-wing mining method according to an embodiment of the present application is described below with reference to the attached drawings. As shown in FIG. 1, the steeply inclined coal seam cross-road single-wing mining method according to an embodiment of the present application includes the following steps: Figures 1 to 3

[0039] ​The coal seam is divided into a plurality of mining sections 1 in the up-down direction, and each mining section 1 is divided into a plurality of mining layers 11 in the thickness direction of the coal seam. Specifically, the plurality of mining sections 1 are mined in turn from top to bottom, and the plurality of mining layers 11 in each mining section 1 are mined in turn from top to bottom. The up-down direction is shown by the arrow in the figure, and the thickness direction of the coal seam is shown by the arrow J in the figure. After the upper layering working face is mined, the two-layered and three-layered working faces are mined in turn from top to bottom by using the system, until the mining section 1 is mined, and then the next mining section 1 is formed by using the same arrangement method.

[0040] The mining area transportation roadway 2 and the mining area return air roadway 21 are arranged below the coal seam floor (lower surface), and the mining area transportation roadway 2 and the mining area return air roadway 21 are both arranged downwardly. The tendency of the coal seam is shown by the arrow H in the figure.

[0041] The upper section return air main roadway 31, the lower section machine rail main roadway 32, the boundary return air raise 33 and the section return air raise 34 are arranged below the coal seam floor. The upper section return air main roadway 31 and the lower section machine rail main roadway 32 both extend along the strike of the coal seam, the upper section return air main roadway 31 is located at the top of the (corresponding) mining section 1, and the lower section machine rail main roadway 32 is located at the bottom of the (corresponding) mining section 1. The boundary return air raise 33 and the section return air raise 34 are both arranged downwardly, the upper section return air main roadway 31 communicates with the lower section machine rail main roadway 32 through the boundary return air raise 33, and the upper section return air main roadway 31 and the lower section machine rail main roadway 32 communicate with the mining area return air roadway 21 through the section return air raise 34. The strike of the coal seam can be the left-right direction, and the left-right direction is shown by the arrow in the figure. For example, the upper section return air main roadway 31 and the lower section machine rail main roadway 32 both extend along the left-right direction, and the boundary return air raise 33 and the section return air raise 34 are provided with air doors.

[0042] The upper section panel roadway 41, the upper section crosscut roadway 42, the lower section panel roadway 43 and the lower section crosscut roadway 44 are arranged in the horizontal direction, the upper section panel roadway 41 and the upper section crosscut roadway 42 are both located at the top of the mining section 1, and the lower section panel roadway 43 and the lower section crosscut roadway 44 are both located at the bottom of the mining section 1.

[0043] The working face return air crossheading 51 is arranged at the top of the mining layer 11, the working face return air crossheading 51 extends along the strike of the coal seam, the working face return air crossheading 51 communicates with the mining area transportation roadway 2 through the upper section panel roadway 41, and the working face return air crossheading 51 communicates with the upper section return air main roadway 31 through the upper section crosscut roadway 42. For example, the working face return air crossheading 51 extends along the left-right direction. The upper section crosscut roadway 42 extends along the front-back direction, and the front-back direction is shown by the arrow in the figure.

[0044] The working face transportation crossheading 52 is arranged at the bottom of the mining layer 11, extends along the strike of the coal seam, is communicated with the mining area transportation roadway 2 through the lower section vehicle yard roadway 43, and is communicated with the lower section machine rail main roadway 32 through the lower section crosscut roadway 44. For example, the working face transportation crossheading 52 extends along the left-right direction, and the lower section crosscut roadway 44 extends along the front-rear direction.

[0045] The initial mining working face 53 is arranged in the mining layer 11 through at least one of the working face return air crossheading 51 and the working face transportation crossheading 52, and the mining layer 11 is mined along the strike of the coal seam starting from the initial mining working face 53. Specifically, the initial mining working face 53 is located at an end (one boundary) of the mining layer 11 along the strike of the coal seam. The mining area transportation roadway 2 and the mining area return air roadway 21 are located at the middle of the mining layer 11 along the strike of the coal seam, and the mining layer 11 is mined to the other end along the strike of the coal seam starting from the initial mining working face 53, and stops at the other boundary of the mining layer 11. For example, the initial mining working face 53 is located at the right end of the mining layer 11, and the mining layer 11 is mined to the left starting from the initial mining working face 53, and stops at the left boundary of the mining layer 11.

[0046] According to the steeply inclined coal seam cross-road single-wing mining method, the upper section return air main roadway 31, the upper section crosscut roadway 42, and the working face return air crossheading 51 form a working face return air system for the coal mining working face return air, the lower section machine rail main roadway 32, the lower section crosscut roadway 44, and the working face transportation crossheading 52 form a working face transportation system for the coal mining working face coal block transportation, and the initial mining working face 53 is taken as a starting point for single-wing mining, which can reduce the production system, lengthen the strike length of the coal mining working face, reduce the working face moving and turning frequency, relieve the tension of mining and excavation connection, and increase the resource recovery rate of the upper part of the mining area roadway and the two sides of the roadway.

[0047] Therefore, the steeply inclined coal seam cross-road single-wing mining method has the advantages of reducing the working face moving and turning frequency and improving the resource recovery rate.

[0048] As Figures 1 to 3As shown in some embodiments, the mining layer 11 is divided into a plurality of mining faces along the strike of the coal seam, and the plurality of mining faces of each mining layer 11 are mined in sequence along the strike of the coal seam, and the air supply path of the fresh air flow is adjusted according to the position of the mining face. Specifically, the fresh air flow can be introduced into the working face transportation crossheading 52 from the lower section depot roadway 43, or the fresh air flow can be introduced into the lower section machine rail roadway 32 and the lower section crosscut roadway 44 and then into the working face transportation crossheading 52 from the lower section depot roadway 43, and the air supply path can be selected according to the position of the coal mining face. For example, the mining layer 11 is divided into a plurality of mining faces along the left-right direction, and the plurality of mining faces of each mining layer 11 are mined in sequence from right to left.

[0049] As shown in some embodiments, the mining layer 11 is divided into a plurality of mining faces along the strike of the coal seam, and the plurality of mining faces of each mining layer 11 are mined in sequence along the strike of the coal seam, and the air supply path of the fresh air flow is adjusted according to the position of the mining face. Specifically, the fresh air flow can be introduced into the working face transportation crossheading 52 from the lower section depot roadway 43, or the fresh air flow can be introduced into the lower section machine rail roadway 32 and the lower section crosscut roadway 44 and then into the working face transportation crossheading 52 from the lower section depot roadway 43, and the air supply path can be selected according to the position of the coal mining face. For example, the mining layer 11 is divided into a plurality of mining faces along the left-right direction, and the plurality of mining faces of each mining layer 11 are mined in sequence from right to left. Figures 1 to 3 As shown in some embodiments, the mining layer 11 is divided into a first mining face 12 and a second mining face 13, the boundary of the first mining face 12 and the second mining face 13 is adjacent to the lower section depot roadway 43 along the strike of the coal seam, and the initial coal mining face 53 is located on the side of the first mining face 12 away from the second mining face 13 along the strike of the coal seam. For example, the first mining face 12 is located on the right side of the second mining face 13, and the initial coal mining face 53 is located on the right side of the first mining face 12.

[0050] In some embodiments, the upper section depot roadway 41, the upper section crosscut roadway 42, the lower section depot roadway 43, and the lower section crosscut roadway 44 are located on the side of the boundary of the first mining face 12 and the second mining face 13 away from the initial coal mining face 53. Specifically, the upper section depot roadway 41 is located on the side of the lower section depot roadway 43 away from the first mining face 12, the upper section crosscut roadway 42 is located on the side of the second mining face 13 away from the first mining face 12, and the lower section crosscut roadway 44 is located on the side of the second mining face 13 away from the first mining face 12. For example, the upper section depot roadway 41 is located on the left side of the lower section depot roadway 43, the upper section crosscut roadway 42 is located on the left side of the second mining face 13, and the lower section crosscut roadway 44 is located on the left side of the second mining face 13.

[0051] As shown in some embodiments, the mining layer 11 is divided into a plurality of mining faces along the strike of the coal seam, and the plurality of mining faces of each mining layer 11 are mined in sequence along the strike of the coal seam, and the air supply path of the fresh air flow is adjusted according to the position of the mining face. Specifically, the fresh air flow can be introduced into the working face transportation crossheading 52 from the lower section depot roadway 43, or the fresh air flow can be introduced into the lower section machine rail roadway 32 and the lower section crosscut roadway 44 and then into the working face transportation crossheading 52 from the lower section depot roadway 43, and the air supply path can be selected according to the position of the coal mining face. For example, the mining layer 11 is divided into a plurality of mining faces along the left-right direction, and the plurality of mining faces of each mining layer 11 are mined in sequence from right to left. Figure 2 As shown in some embodiments, when the first mining face 12 is mined, the fresh air flow is introduced into the working face transportation crossheading 52, the coal mining face, the working face return air crossheading 51, the upper section crosscut roadway 42, the upper section return air main roadway 31, the section return air upper slope 34, and the mining area return air roadway 21 from the lower section depot roadway 43 in sequence. Thus, the air inlet path of the fresh air flow can be facilitated to enter the coal mining face. For example, the first mining face 12 is the A working face, and the A working face is located in the abcd region.

[0052] As shown in some embodiments, the mining layer 11 is divided into a plurality of mining faces along the strike of the coal seam, and the plurality of mining faces of each mining layer 11 are mined in sequence along the strike of the coal seam, and the air supply path of the fresh air flow is adjusted according to the position of the mining face. Specifically, the fresh air flow can be introduced into the working face transportation crossheading 52 from the lower section depot roadway 43, or the fresh air flow can be introduced into the lower section machine rail roadway 32 and the lower section crosscut roadway 44 and then into the working face transportation crossheading 52 from the lower section depot roadway 43, and the air supply path can be selected according to the position of the coal mining face. For example, the mining layer 11 is divided into a plurality of mining faces along the left-right direction, and the plurality of mining faces of each mining layer 11 are mined in sequence from right to left. Figure 3As shown, during mining operations at the second mining face 13, fresh air flows sequentially from the lower section yard roadway 43 into the lower section main track roadway 32, the lower section stone gate roadway 44, the working face transport roadway 52, the coal mining face, the working face return air roadway 51, the upper section stone gate roadway 42, the upper section return air roadway 31, the section return air incline 34, and the mining area return air roadway 21. Specifically, when mining at the second mining face 13, the first mining face 12 has already been backfilled. The air supply path can be optimized by connecting the lower section main track roadway 32 and the lower section stone gate roadway 44 to the working face transport roadway 52, making it easier for fresh air to enter the coal mining face. For example, the second mining face 13 is the B working face, located in the area def.

[0053] In some embodiments, the first mining face 12 is mined after the lower section of the main track roadway 32 is arranged. Alternatively, the lower section of the main track roadway 32 is arranged after the first mining face 12 is mined. Specifically, the timing of arranging the lower section of the main track roadway 32 can be selected according to the actual project progress.

[0054] like Figure 2 and Figure 3 As shown, in some embodiments, the distance between the connection point of the lower section roadway 43 and the working face transport roadway 52 and the boundary of the first mining face 12 and the second mining face 13 is greater than or equal to 20 meters and less than or equal to 40 meters. For example, the distance between the connection point of the lower section roadway 43 and the working face transport roadway 52 and the boundary (at line ad) of the first mining face 12 and the second mining face 13 is 30 meters.

[0055] like Figure 1 As shown, the distance (in the thickness direction of the coal seam) between each of the upper section return airway 31, the lower section machine rail roadway 32, and the boundary return air incline 33 and the coal seam (floor) is greater than or equal to 25 meters. This reduces the impact of mining on the upper section return airway 31, the lower section machine rail roadway 32, and the boundary return air incline 33. For example, the distance (in the thickness direction of the coal seam) between each of the upper section return airway 31, the lower section machine rail roadway 32, and the boundary return air incline 33 and the coal seam (floor) is 30 meters.

[0056] like Figure 2 and Figure 3As shown, in some embodiments, the mining area transport roadway 2 includes a main mining area transport roadway 22 and a secondary mining area transport roadway 23. Both the main mining area transport roadway 22 and the secondary mining area transport roadway 23 are inclined downwards. The secondary mining area transport roadway 23 is connected to the upper section yard roadway 41 and the lower section yard roadway 43. In the vertical and vertical cross-section, the extension direction of the projection of the upper section yard roadway 41 and the extension direction of the projection of the lower section yard roadway 43 are both at an angle to the extension direction of the projection of the secondary mining area transport roadway 23. For example, the projection of the upper section yard roadway 41 is inclined to the left rearward, and the projection of the lower section yard roadway 43 is inclined to the right rearward.

[0057] like Figure 1 As shown, the distance (in the thickness direction of the coal seam) between each of the mining area return airway 21, the mining area main haulage roadway 22, and the mining area auxiliary haulage roadway 23 and the coal seam (floor) is greater than or equal to 35 meters. This reduces the impact on the mining area return airway 21, the mining area main haulage roadway 22, and the mining area auxiliary haulage roadway 23 during mining. For example, the distance (in the thickness direction of the coal seam) between each of the mining area return airway 21, the mining area main haulage roadway 22, and the mining area auxiliary haulage roadway 23 and the coal seam (floor) is 40 meters.

[0058] like Figure 2 and Figure 3 As shown, in some embodiments, a transfer coal bunker 45 is provided on the lower section roadway 43, and the transfer coal bunker 45 is connected to the main haulage roadway 22 of the mining area. Specifically, the transfer coal bunker 45 can transfer coal to the belt conveyor of the main haulage roadway 22 of the mining area for transportation.

[0059] In some embodiments, the lower section track roadway 32 of the upper one of two adjacent mining sections 1 constitutes at least a portion of the upper section return air roadway 31 of the lower one of two adjacent mining sections 1.

[0060] like Figure 1 As shown, in some embodiments, the angles between the mining area return airway 21, the mining area main haulage roadway 22, the mining area auxiliary haulage roadway 23, the boundary return air incline 33, and the section return air incline 34 and the horizontal plane are less than or equal to 25°. Specifically, β is the coal seam dip angle, generally greater than 45°, and a is the mining area downhill slope, generally less than or equal to 25°. For example, the angles between the mining area return airway 21, the mining area main haulage roadway 22, the mining area auxiliary haulage roadway 23, the boundary return air incline 33, and the section return air incline 34 and the horizontal plane are 25°.

[0061] The single-wing mining method of steeply inclined coal seam across roadway according to the embodiment of the present application can pass through the working face length, relieve mining and excavation connection, reduce the working face moving frequency, reduce the production cost, provide a good working environment for the workers, and create a safe production management condition. The working face is arranged on the upper part of the mining area roadway, a certain protective coal pillar is reserved therebetween, the mining working face can mine the coal pillars on both sides of the mining area roadway and the upper part of the coal seam of the mining area roadway, the resource recovery rate is improved, good technical safety benefits and social benefits are obtained. The A working face production system can be formed for mining, the B working face production system is excavated during the mining of the A working face, and the arrangement mode can relieve the tense situation of mining and excavation connection.

[0062] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0063] In addition, the terms "first", "second" are only for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0064] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection or communication with each other; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0065] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0066] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the present application. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Moreover, the terms "first", "second", "third", etc. are used herein merely as identifiers for different elements, regions, layers, or sections, and are not intended to denote a spatial or chronological priority or order except if explicitly so defined. Also, the terms "comprises", "comprising", "includes", "including", or the like are used herein to generally mean comprising, including, or consisting of, unless otherwise indicated.

[0067] Although the above-mentioned embodiments have been shown and described, it is to be understood that the above-mentioned embodiments are exemplary, and are not to be construed as limiting the present application, and any changes, modifications, replacements, and variations of the above-mentioned embodiments made by those skilled in the art are within the scope of the present application.

Claims

1. A steeply inclined coal seam cross-road single-wing mining method, characterized in that, The method comprises the following steps: dividing the coal seam into a plurality of mining sections along the up-down direction, and dividing each mining section into a plurality of mining layers along the thickness direction of the coal seam; arranging a mining area transportation roadway and a mining area return air roadway below the coal seam floor, both of which are arranged downwardly; arranging an upper section return air main roadway, a lower section machine rail main roadway, a boundary return air upward inclined roadway and a section return air upward inclined roadway below the coal seam floor, the upper section return air main roadway and the lower section machine rail main roadway both extend along the strike of the coal seam, the upper section return air main roadway is located at the top of the mining section, the lower section machine rail main roadway is located at the bottom of the mining section, the boundary return air upward inclined roadway and the section return air upward inclined roadway are both arranged downwardly, the upper section return air main roadway is communicated with the lower section machine rail main roadway through the boundary return air upward inclined roadway, and the upper section return air main roadway and the lower section machine rail main roadway are communicated with the mining area return air roadway through the section return air upward inclined roadway; arranging an upper section yard roadway, an upper section cross-cut roadway, a lower section yard roadway and a lower section cross-cut roadway along the horizontal direction, the upper section yard roadway and the upper section cross-cut roadway are both located at the top of the mining section, and the lower section yard roadway and the lower section cross-cut roadway are both located at the bottom of the mining section; arranging a working face return air crossheading at the top of the mining layer, the working face return air crossheading extends along the strike of the coal seam, the working face return air crossheading is communicated with the mining area transportation roadway through the upper section yard roadway, and the working face return air crossheading is communicated with the upper section return air main roadway through the upper section cross-cut roadway; arranging a working face transportation crossheading at the bottom of the mining layer, the working face transportation crossheading extends along the strike of the coal seam, the working face transportation crossheading is communicated with the mining area transportation roadway through the lower section yard roadway, and the working face transportation crossheading is communicated with the lower section machine rail main roadway through the lower section cross-cut roadway; arranging an initial mining working face in the mining layer through at least one of the working face return air crossheading and the working face transportation crossheading, and mining the mining layer along the strike of the coal seam from the initial mining working face.

2. The steeply inclined coal seam mining method across the roadway single wing according to claim 1, characterized in that, dividing the mining layer into a plurality of mining faces along the strike of the coal seam, and mining the plurality of mining faces of each mining layer along the strike of the coal seam in sequence, and adjusting the air supply path of fresh air flow according to the position of the mining face.

3. The steeply inclined seam mining method across the roadway and single wing according to claim 2, characterized in that, dividing the mining layer into a first mining face and a second mining face, the boundary of the first mining face and the second mining face is adjacent to the lower section yard roadway along the strike of the coal seam, and the initial mining working face is located on the side of the first mining face away from the second mining face along the strike of the coal seam.

4. The steeply inclined coal seam cross-road single-wing mining method according to claim 3, wherein the upper section yard roadway, the upper section cross-cut roadway, the lower section yard roadway and the lower section cross-cut roadway are located on the side of the boundary of the first mining face and the second mining face away from the initial mining working face. When mining in the first mining face, fresh air flows from the lower section depot roadway into the working face transportation crossheading, the coal mining face, the working face return air crossheading, the upper section crosscut, the upper section return air main roadway, the section return air upgate and the mining area return air roadway in turn; When mining in the second mining face, fresh air flows from the lower section depot roadway into the lower section machine rail main roadway, the lower section crosscut, the working face transportation crossheading, the coal mining face, the working face return air crossheading, the upper section crosscut, the upper section return air main roadway, the section return air upgate and the mining area return air roadway.

5. The steeply inclined coal seam cross-road single-wing mining method of claim 4, wherein, the first mining face is mined after the lower section machine rail main roadway is arranged; or, the lower section machine rail main roadway is arranged after the first mining face is mined.

6. The steeply inclined coal seam cross-road single-wing mining method of claim 4, wherein, each of the upper section return air main roadway, the lower section machine rail main roadway and the boundary return air upgate is greater than or equal to 25 meters away from the coal seam.

7. The steeply inclined seam mining method across the roadway and single wing mining method according to claim 1, characterized in that, The mining area transportation roadway includes a mining area main haulage roadway and a mining area auxiliary haulage roadway, both of which are arranged in a downward inclination, and the mining area auxiliary haulage roadway is in communication with the upper section depot roadway and the lower section depot roadway. In a cross section perpendicular to the upward and downward directions, the extension direction of the projection of the upper section depot roadway and the extension direction of the projection of the lower section depot roadway are both at an angle with the extension direction of the projection of the mining area auxiliary haulage roadway.

8. The steeply inclined coal seam cross-road single-wing mining method of claim 7, wherein, each of the mining area return air roadway, the mining area main haulage roadway and the mining area auxiliary haulage roadway is greater than or equal to 35 meters away from the coal seam; the angle between the mining area return air roadway, the mining area main haulage roadway, the mining area auxiliary haulage roadway, the boundary return air upgate and the section return air upgate and the horizontal plane is less than or equal to 25°; a transshipment bunker is arranged on the lower section depot roadway, and the transshipment bunker is in communication with the mining area main haulage roadway.

9. The steeply inclined seam mining method across the roadway and single wing mining method according to claim 1, characterized in that, The lower section machine rail main roadway of an upper one of two adjacent mining sections constitutes at least part of the upper section return air main roadway of a lower one of the two adjacent mining sections.

10. The steeply inclined coal seam mining method across the roadway single wing according to any one of claims 1-9, characterized in that, A plurality of mining sections are mined in turn from top to bottom, and a plurality of mining layers in each of the mining sections are mined in turn from top to bottom.

Images