Mining method for extra-thick seams

Abstract

The application provides a mining method for a super-thick coal seam. The mining method for the super-thick coal seam comprises the following steps: dividing a mining area or a mining panel into a plurality of fully-mechanized mining faces in a horizontal direction, taking a fully-mechanized mining face far away from a mining opening as a preset fully-mechanized mining face; entering through a mining opening, an auxiliary transportation adit of the mining area or the mining panel and a panel central auxiliary transportation roadway in sequence to mine a return airway of the preset fully-mechanized mining face, and then mining auxiliary transportation roadways parallel to the cuttings of the fully-mechanized mining faces, wherein the return airway is communicated with the cuttings of the fully-mechanized mining faces through the auxiliary transportation roadways; taking the preset fully-mechanized mining face as a reference surface, and mining the fully-mechanized mining faces in a first direction S1 or a second direction S2 through the auxiliary transportation roadways, wherein the first direction S1 is a direction from the preset fully-mechanized mining face to the mining opening, and the second direction S2 is a direction from the mining opening to the preset fully-mechanized mining face. The application effectively solves the problem that the mining efficiency is low due to the complex moving and turning-over transportation route for the super-thick coal seam in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground mining, in particular to a mining method for a super-thick coal seam. BACKGROUND

[0002] At present, the traditional underground mining scheme is to divide the whole mine field into several mining levels, then divide each mining level into several mining areas or panels, and finally arrange several working faces in each mining area or panel. Specifically, a fully-mechanized working face of a mine usually adopts a double-roadway arrangement (a main haulage roadway and an auxiliary haulage roadway), the main haulage roadway is mainly used for coal transportation, and the auxiliary haulage roadway is mainly used for material, equipment and personnel transportation, and simultaneously serves as the return air roadway of the next working face.

[0003] However, with the continuous increase of the mining height of the fully-mechanized working face of the super-thick coal seam, the size of the equipment for the working face also increases, and accordingly, the cross-sectional size of the auxiliary haulage roadway as the equipment transportation roadway also increases. If the traditional fully-mechanized working face roadway arrangement is adopted, the roadway excavation cannot be completed at one time, and needs to be excavated twice, which leads to a low mining and excavation efficiency, and further increases the labor intensity of the workers. SUMMARY

[0004] The main purpose of the present application is to provide a mining method for a super-thick coal seam, so as to solve the problem of low excavation efficiency caused by the complex moving and face-inversion transportation route for the super-thick coal seam in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present application provides a mining method for a super-thick coal seam, which comprises the following steps: dividing a mining area or panel into a plurality of fully-mechanized faces along the horizontal direction, and taking a fully-mechanized face far away from a mining opening as a preset fully-mechanized face; sequentially entering through a mining opening, an auxiliary haulage adit of the mining area or panel and a panel central auxiliary haulage roadway, so as to mine a return air roadway of the preset fully-mechanized face, and then mine an auxiliary transportation roadway parallel to the open-off cut of each fully-mechanized face, wherein the return air roadway is communicated with the open-off cut of each fully-mechanized face through the auxiliary transportation roadway; taking the preset fully-mechanized face as a reference surface, and sequentially mining the fully-mechanized faces along a first direction S1 or a second direction S2 through the auxiliary transportation roadway, wherein the first direction S1 is a direction from the preset fully-mechanized face to the mining opening, and the second direction S2 is a direction from the mining opening to the preset fully-mechanized face.

[0006] Further, along the horizontal direction of the mining area or panel, the preset fully-mechanized face is located in the middle part of the mining area or panel.

[0007] Further, the method that the return air roadway is communicated with the open-off cut of each fully-mechanized face through the auxiliary transportation roadway comprises the following steps: mining a plurality of roadway groups, the plurality of roadway groups are one-to-one correspondingly arranged with the open-off cut of the plurality of fully-mechanized faces, each roadway group comprises a first roadway and a second roadway, the first roadway is communicated with the main haulage roadway of the fully-mechanized face corresponding to the roadway group, and the second roadway is communicated with the auxiliary haulage roadway of the fully-mechanized face corresponding to the roadway group.

[0008] Further, the extension direction of the first roadway is consistent with the extension direction of the main haulage roadway of the fully-mechanized mining face corresponding to the roadway group, and the second roadway is consistent with the extension direction of the auxiliary haulage roadway of the fully-mechanized mining face corresponding to the roadway group.

[0009] Further, the method for sequentially mining the fully-mechanized mining face through the auxiliary haulage roadway along the first direction S1 or the second direction S2 comprises the following steps: sequentially selecting a fully-mechanized mining face to be mined as a selected fully-mechanized mining face along the first direction S1 or the second direction S2, mining the main haulage roadway and the auxiliary haulage roadway of the selected fully-mechanized mining face through the open-off cut of the selected fully-mechanized mining face, mining the main retreat passage of the selected fully-mechanized mining face after the main haulage roadway is mined, mining the auxiliary retreat passage of the selected fully-mechanized mining face after the auxiliary haulage roadway is mined, and the main retreat passage and the auxiliary retreat passage are communicated; and then entering the return air roadway and the auxiliary haulage roadway to select another fully-mechanized mining face adjacent to the selected fully-mechanized mining face as a selected fully-mechanized mining face along the first direction S1 or the second direction S2.

[0010] Further, the auxiliary haulage roadway has a plurality of spaced-apart shunting chambers.

[0011] Further, a plurality of coal pillars are arranged between the auxiliary haulage roadway and the open-off cut.

[0012] Further, the number of the coal pillars is determined according to the mine pressure value in the mining area or the mining panel.

[0013] Further, the return air roadway is the auxiliary haulage roadway of the preset fully-mechanized mining face.

[0014] Further, taking the preset fully-mechanized mining face as a reference surface, the method for sequentially mining the fully-mechanized mining face through the auxiliary haulage roadway along the first direction S1 or the second direction S2 comprises the following steps: dividing the mining area or the mining panel into a first region and a second region through the reference surface, and the first region and the second region are respectively located on the two sides of the reference surface; along the first direction, the first region is located at the downstream of the reference surface; along the second direction, the second region is located at the downstream of the reference surface; wherein, in the first region, the fully-mechanized mining face is sequentially mined along the first direction; and in the second region, the fully-mechanized mining face is sequentially mined along the second direction.

[0015] According to the technical scheme of the present application, taking the preset fully-mechanized mining face as a reference surface, the fully-mechanized mining face is sequentially mined through the auxiliary haulage roadway along the first direction S1 or the second direction S2. In this way, when a super-thick coal seam needs to be mined, auxiliary haulage roadways parallel to the open-off cuts of the fully-mechanized mining faces are excavated at the open-off cuts of the fully-mechanized mining faces, and the auxiliary haulage roadways are communicated with the return air roadways of the preset fully-mechanized mining faces in the mining area or the mining panel, so that the auxiliary haulage roadways are used as special roadways for equipment transportation during the moving and turning of the fully-mechanized mining faces in the entire mining area or mining panel.

[0016] Compared with the secondary mining in the prior art for the extra-thick coal seam, the extra-thick coal seam mining method can complete the tunneling of the mining area at one time, thereby solving the problem of low tunneling efficiency caused by the complex moving and inverted face transportation route in the prior art for the extra-thick coal seam, improving the mining efficiency, and reducing the labor intensity of the workers. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which form a part of the present description, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the present application, and their

[0018] Figure 1 A mining schematic diagram of an embodiment of the extra-thick coal seam mining method according to the present application is shown.

[0019] Among them, the above-mentioned drawings include the following reference signs:

[0020] 10, preset fully mechanized coal mining face; 11, air return roadway; 20, auxiliary transportation adit; 30, centralized auxiliary transportation roadway of panel; 40, cut; 50, auxiliary transportation roadway; 60, roadway group; 61, first roadway; 62, second roadway; 70, main transportation roadway; 80, auxiliary transportation roadway; 90, main withdrawal channel; 100, auxiliary withdrawal channel. DETAILED DESCRIPTION

[0021] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0022] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0023] In the present application, unless otherwise specified, the orientation words such as "up, down" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions; similarly, for the convenience of understanding and description, "left, right" are generally directed to the left and right shown in the drawings; "inner, outer" refer to the inner and outer relative to the contour of each component itself, but the above orientation words are not used to limit the present application.

[0024] In order to solve the problem of low tunneling efficiency caused by the complex moving and inverted face transportation route in the prior art for the extra-thick coal seam, the present application provides an extra-thick coal seam mining method.

[0025] As shown in Figure 1 The extra-thick coal seam mining method comprises:

[0026] The mining area or the mining panel is divided into a plurality of fully mechanized faces in a horizontal direction, and a fully mechanized face far from the mining opening is taken as a preset fully mechanized face 10;

[0027] The preset fully mechanized face 10 is sequentially accessed through the mining opening, the auxiliary transportation adit 20 of the mining area or the mining panel, and the centralized auxiliary transportation roadway 30 of the panel area, the air return roadway 11 of the preset fully mechanized face 10 is mined, and the auxiliary transportation roadway 50 parallel to the open-off cut 40 of each fully mechanized face is mined, and the air return roadway 11 is communicated with the open-off cut 40 of each fully mechanized face through the auxiliary transportation roadway 50.

[0028] The fully mechanized faces are sequentially mined in the first direction S1 or the second direction S2 through the auxiliary transportation roadway 50 with the preset fully mechanized face 10 as a reference surface, wherein the first direction S1 is a direction from the preset fully mechanized face 10 to the mining opening, and the second direction S2 is a direction from the mining opening to the preset fully mechanized face 10.

[0029] In the technical scheme, the fully mechanized faces are sequentially mined in the first direction S1 or the second direction S2 through the auxiliary transportation roadway 50 with the preset fully mechanized face 10 as a reference surface. In this way, when the thick coal seam needs to be mined, the auxiliary transportation roadway 50 parallel to the open-off cut 40 of each fully mechanized face is excavated at the open-off cut 40 of each fully mechanized face, and the auxiliary transportation roadway 50 is communicated with the air return roadway 11 of the preset fully mechanized face 10 in the mining area or the mining panel, so that the auxiliary transportation roadway 50 is taken as a special roadway for equipment transportation during the moving and turning of each fully mechanized face in the whole mining area or the mining panel.

[0030] Compared with the prior art that needs to be twice mined for the thick coal seam, the thick coal seam mining method in the embodiment can complete the excavation of the mining area at one time, thereby solving the problem that the moving and turning of the thick coal seam in the prior art has a relatively complex transportation route, and improving the mining efficiency and reducing the labor intensity of the workers.

[0031] In the embodiment, the special channel is taken as the moving route, and each working face auxiliary transportation crossheading does not need to be taken as the moving route, so that a large amount of preparation cost is saved, especially for the large-height working face, the height of the auxiliary transportation crossheading is reduced, the amount of roadway maintenance is reduced, and safety production is beneficial.

[0032] In the embodiment, according to the mine field range and the planning of each horizontal mining area or panel area of the mine, the mining area or the mining panel is divided into a plurality of fully mechanized faces, and the plurality of fully mechanized faces are sequentially mined.

[0033] In the embodiment, each working face roadway of a certain level mining area or panel of a mine still adopts double-lane arrangement, but each auxiliary transportation lane 80 does not need to be used as a device transportation lane during the moving and turning of the face, the roadway height is reduced, the cross-sectional size of the working face auxiliary transportation lane 80 is reduced, the material consumption of the roadway anchor rod, anchor cable, mesh and concrete floor is reduced, and then the production cost is reduced. At the same time, the roadway cross-section can meet the requirements of once-lane excavation of the excavation equipment, and then the roadway excavation efficiency is improved.

[0034] In the embodiment, the preset fully mechanized face 10 is located in the middle of the mining area or panel in the horizontal direction of the mining area or panel. In this way, the above-mentioned arrangement can reduce the moving and turning distance of the working face, shorten the working face production time, and reduce the moving and turning cost. On the other hand, the preset fully mechanized face 10 (12412 working face) divides the panel into two independent areas (area one is 12401-12407 fully mechanized face, and area two is 12408-12412 fully mechanized face), which is beneficial to the treatment of low oxygen and fire prevention and extinguishment during the working face mining. At the same time, the above-mentioned arrangement makes the preset fully mechanized face 10 not affected by mining, and facilitates roadway maintenance.

[0035] In the embodiment, the preset fully mechanized face 10 is the 12312 fully mechanized face and is the last fully mechanized working face of the panel.

[0036] In the embodiment, the method that the return air lane 11 communicates with the open-off cut 40 of each fully mechanized face through the auxiliary transportation lane 50 includes:

[0037] A plurality of roadway groups 60 are mined, the plurality of roadway groups 60 are arranged in one-to-one correspondence with the open-off cut 40 of the plurality of fully mechanized faces, each roadway group 60 includes a first lane 61 and a second lane 62, the first lane 61 communicates with the main transportation lane 70 of the fully mechanized face corresponding to the roadway group 60, and the second lane 62 communicates with the auxiliary transportation lane 80 of the fully mechanized face corresponding to the roadway group 60.

[0038] Specifically, the above-mentioned arrangement ensures that the auxiliary transportation lane 50 can communicate with the open-off cut 40, and then ensures that the staff can smoothly mine the panel, and reduces the labor intensity of the staff.

[0039] In the embodiment, the extension direction of the first lane 61 is consistent with the extension direction of the main transportation lane 70 of the fully mechanized face corresponding to the roadway group 60, and the extension direction of the second lane 62 is consistent with the extension direction of the auxiliary transportation lane 80 of the fully mechanized face corresponding to the roadway group 60. In this way, the above-mentioned arrangement makes the mining of the first lane 61 and the second lane 62 easier and more convenient, and reduces the mining difficulty and the labor intensity of the staff.

[0040] In the embodiment, the method that the fully mechanized face is mined in the first direction S1 or the second direction S2 through the auxiliary transportation lane 50 includes:

[0041] The fully mechanized face to be mined is selected in sequence along the first direction S1 or the second direction S2 as a selected fully mechanized face, the main haulage roadway 70 and the auxiliary haulage roadway 80 of the selected fully mechanized face are mined through the open-off cut 40 of the selected fully mechanized face, the main recovery passage 90 of the selected fully mechanized face is mined after the main haulage roadway 70 is mined, the auxiliary recovery passage 100 of the selected fully mechanized face is mined after the auxiliary haulage roadway 80 is mined, and the main recovery passage 90 and the auxiliary recovery passage 100 are communicated; then another fully mechanized face adjacent to the selected fully mechanized face is selected as a selected fully mechanized face along the first direction S1 or the second direction S2 in the air return roadway 11 and the auxiliary haulage roadway 50.

[0042] In the embodiment, the width of each fully mechanized face is designed to be about 300 m in combination with the mining height of the fully mechanized face, the conveying capacity of the scraper conveyor and the conveying capacity and length of the belt conveyor, and the advancing length is about 5000 m.

[0043] Optionally, the auxiliary haulage roadway 50 has a plurality of interval arranged shunting chambers to facilitate vehicle avoidance.

[0044] Optionally, one shunting chamber is arranged in the auxiliary haulage roadway 50 every 1000 m to facilitate vehicle avoidance.

[0045] Optionally, a plurality of coal pillars are arranged between the auxiliary haulage roadway 50 and the open-off cut 40. Specifically, the auxiliary haulage roadway 50 is arranged at the panel boundary, and a 30 m coal pillar is arranged at each fully mechanized face to make the roadway only affected by mining once.

[0046] In the embodiment, the number of coal pillars is determined by the mine pressure value in the mining area or the mining panel. In this way, a reasonable coal pillar is arranged in combination with the mine pressure condition of the mining face and the open-off cut of the working face to facilitate roadway maintenance.

[0047] In the embodiment, the air return roadway 11 is the auxiliary haulage roadway 80 of the preset fully mechanized face 10.

[0048] In the embodiment, the method for mining the fully mechanized faces in sequence along the first direction S1 or the second direction S2 through the auxiliary haulage roadway 50 with the preset fully mechanized face 10 as the reference surface comprises:

[0049] The mining area or the mining panel is divided into a first region and a second region through the reference surface, and the first region and the second region are respectively located at two sides of the reference surface; along the first direction, the first region is located at the downstream of the reference surface; along the second direction, the second region is located at the downstream of the reference surface. In the first region, the fully mechanized faces are mined in sequence along the first direction; in the second region, the fully mechanized faces are mined in sequence along the second direction.

[0050] Specifically, during the recovery of the adjacent fully mechanized mining face, the auxiliary transportation roadway 80 of the previous fully mechanized mining face will be used as the air return roadway of the next fully mechanized mining face, the smaller the roadway section, the smaller the influence degree of the secondary mining, the better the stability of the roadway roof and side rock, and the easier the maintenance.

[0051] Optionally, the fully mechanized mining face has a safety exit, thereby improving the disaster resistance when a disaster occurs in the mining field, and the auxiliary transportation roadway 50 realizes annular transportation, so that the transportation efficiency and safety are further improved.

[0052] Specifically, the auxiliary transportation roadway 80 of the fully mechanized mining face in the method for mining the super-thick seam in the embodiment is designed to have a section of 5.4*4.8m from 6*5.1m. According to the average length of the auxiliary transportation roadway of the fully mechanized mining face, 5255m, the support cost of 2,087,000 yuan, the concrete floor cost of 2,705,000 yuan, 12 fully mechanized mining faces in total, and the total cost saving of 57,504,000 yuan can be saved.

[0053] The specific calculation details are as follows:

[0054] (1) The support material cost of 2,087,000 yuan = [145.28+120+102+25*(0.6+0.4)+(12*0.4)]*5255 yuan. After the size of the fully mechanized mining face roadway section is reduced, 0.6m wide lead wire mesh and a set of threaded steel anchor rod can be saved per meter of roof advance, 0.4m wide lead wire mesh and a set of glass steel anchor rod can be saved per meter of the auxiliary transportation crossheading normal side, and 0.4m wide plastic mesh and a set of threaded steel anchor rod can be saved per meter of the auxiliary transportation crossheading auxiliary side. Among them, the total cost of the threaded steel roof anchor rod man-machine material is 145.28 yuan / set, the total cost of the glass steel side anchor rod man-machine material is 120 yuan / set, the total cost of the threaded steel side anchor rod man-machine material is 102 yuan / set, the lead wire mesh is 25 yuan / m 2 , and the plastic mesh is 12 yuan / m 2 .

[0055] (2) The concrete floor material cost of 2,705,000 yuan = (6+0.6)*0.15*520*5255. The roadway width is adjusted from 6m to 5.4m, the concrete floor thickness is adjusted from 0.3m to 0.15m, and the total cost of the concrete man-machine material is 520 yuan / m 3 .

[0056] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0057] With the preset fully mechanized coal mining face as a reference face, the fully mechanized coal mining face is sequentially mined along the first direction S1 or the second direction S2 through the auxiliary transportation roadway. In this way, when the super-thick coal seam needs to be mined, the auxiliary transportation roadway parallel to each cut is excavated at the cut of each fully mechanized coal mining face, and the auxiliary transportation roadway is communicated with the return airway of the preset fully mechanized coal mining face in the mining area or panel, so as to use the auxiliary transportation roadway as a special roadway for equipment transportation during the moving and turning of each fully mechanized coal mining face in the whole mining area or panel.

[0058] Compared with the secondary mining in the prior art for the super-thick coal seam, the super-thick coal seam mining method in the present application can complete the excavation of the mining area at one time, thereby solving the problem of low excavation efficiency caused by the complex moving and turning transportation route for the super-thick coal seam in the prior art, improving the mining efficiency, and reducing the labor intensity of the workers.

[0059] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0060] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that, when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or combination thereof.

[0061] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0062] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of mining a very thick seam, characterized in that, The method comprises the following steps: dividing a mining area or a mining panel into a plurality of fully mechanized mining faces in a horizontal direction, and taking a fully mechanized mining face far away from a mining opening as a preset fully mechanized mining face (10); entering a return airway (11) of the preset fully mechanized mining face (10) through the mining opening, an auxiliary transportation adit (20) and a panel centralized auxiliary transportation roadway (30) of the mining area or the mining panel in sequence, and then mining an auxiliary transportation roadway (50) parallel to a cut of each of the fully mechanized mining faces (40); taking the preset fully mechanized mining face (10) as a reference surface, and mining fully mechanized mining faces in a first direction S1 or a second direction S2 through the auxiliary transportation roadway (50); the first direction S1 is a direction from the preset fully mechanized mining face (10) to the mining opening, and the second direction S2 is a direction from the mining opening to the preset fully mechanized mining face (10); the method for connecting the return airway (11) with the cut (40) of each of the fully mechanized mining faces (40) through the auxiliary transportation roadway (50) comprises the following steps: mining a plurality of roadway groups (60), the plurality of roadway groups (60) are arranged in one-to-one correspondence with the cuts (40) of the plurality of fully mechanized mining faces (40), each of the roadway groups (60) comprises a first roadway (61) and a second roadway (62), the first roadway (61) is connected with a main transportation roadway (70) of the fully mechanized mining face corresponding to the roadway group (60), and the second roadway (62) is connected with an auxiliary transportation roadway (80) of the fully mechanized mining face corresponding to the roadway group (60).

2. The method of mining a very thick seam according to claim 1, characterized in that, In the horizontal direction of the mining area or the mining panel, the preset fully mechanized mining face (10) is located in the middle of the mining area or the mining panel.

3. The method of mining a very thick seam as claimed in claim 1, characterized in that, The extension direction of the first roadway (61) is consistent with the extension direction of the main transportation roadway (70) of the fully mechanized mining face corresponding to the roadway group (60), and the extension direction of the second roadway (62) is consistent with the extension direction of the auxiliary transportation roadway (80) of the fully mechanized mining face corresponding to the roadway group (60).

4. The method of mining a thick seam according to claim 1, characterised by the fact that, The method for mining the fully mechanized mining faces in the first direction S1 or the second direction S2 through the auxiliary transportation roadway (50) comprises the following steps: selecting a fully mechanized mining face to be mined in the first direction S1 or the second direction S2 in sequence as a selected fully mechanized mining face, mining a main transportation roadway (70) and an auxiliary transportation roadway (80) of the selected fully mechanized mining face through a cut (40) of the selected fully mechanized mining face, mining a main return channel (90) of the selected fully mechanized mining face after the main transportation roadway (70) is mined, mining an auxiliary return channel (100) of the selected fully mechanized mining face after the auxiliary transportation roadway (80) is mined, the main return channel (90) is connected with the auxiliary return channel (100), and then entering the return airway (11) and the auxiliary transportation roadway (50) to select another fully mechanized mining face adjacent to the selected fully mechanized mining face as a selected fully mechanized mining face in the first direction S1 or the second direction S2.

5. The method of mining of extra thick seams according to claim 1, characterized in that, The auxiliary transportation roadway (50) has a plurality of spaced-apart shunting chambers.

6. The method of mining a thick seam according to claim 1, characterised by the fact that, A plurality of coal pillars are arranged between the auxiliary transportation roadway (50) and the cut (40).

7. The method of mining of extra thick seams according to claim 6, characterized in that, The number of the coal pillars is determined according to a mine pressure value in the mining area or the mining panel.

8. The method of mining of extra thick seams according to claim 1, characterized in that, The return air lane (11) is an auxiliary transportation lane (80) of the preset fully mechanized mining face (10).

9. The method of mining of extra thick seams according to claim 1, characterized in that, A method for sequentially mining fully mechanized mining faces along a first direction S1 or a second direction S2 through the auxiliary transportation lane (50) with the preset fully mechanized mining face (10) as a reference surface includes: The mining area or mining panel is divided into a first region and a second region through the reference surface, and the first region and the second region are located on two sides of the reference surface; along the first direction, the first region is located downstream of the reference surface; along the second direction, the second region is located downstream of the reference surface; Wherein, in the first region, fully mechanized mining faces are sequentially mined along the first direction; in the second region, fully mechanized mining faces are sequentially mined along the second direction.

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