Full mining and full filling drilling method for inclined thin coal seams

Abstract

The present invention relates to the technical field of thin coal seam filling mining, and in particular to a full-mining and full-filling drilling method for inclined thin coal seams, comprising: determining the length of the working face; L , arrange preparation tunnels, arrange first mining face mining tunnels, determine filling step distance l , first drilling, filling drilling, full mining and filling of the working face, arrangement of the subsequent working face return tunnel, full mining and filling of the subsequent working face, and full mining and filling of the mining area. The full mining and filling drilling method for inclined thin coal seams provided by the present invention has the following beneficial effects: the working face production equipment is simple and no support is required; by utilizing the inclination of the coal seam, the drilled and mined coal body can slide into the scraper conveyor by itself, and the filling paste can slide into the goaf by itself; the gangue aggregate is made into a paste filling material to fill the goaf, which slows down the appearance of mine pressure, prevents surface subsidence, and reduces gangue discharge; the drilling chute can leave a lane along the goaf for use by the subsequent working face, and the mining connection is fast; there is no coal pillar remaining in the working face and between the working faces, and the recovery rate is high.

Description

Technical Field

[0001] The invention relates to the technical field of thin coal seam filling mining, in particular to a full-mining and full-filling drilling method for inclined thin coal seams. Background Art

[0002] my country's thin coal seam resources are widely distributed and have abundant reserves, accounting for approximately 20.4% of the country's total recoverable coal reserves. However, current thin coal seam mining technology in my country generally suffers from problems such as difficulty in implementation, poor production efficiency, and the presence of many coal pillars. In addition, a considerable portion of thin coal seam resources are "three-down" compressed coal, making them difficult to recover. The above-mentioned thin coal seam mining problems have resulted in a large amount of thin coal seam coal resources in my country being shelved, wasting a large amount of coal resources. Thin coal seam coal production only accounts for 10% of total coal production. Therefore, the green and efficient mining of thin coal seam coal resources has always been a hot and difficult issue in the field of coal mining. It is urgent to develop a green and efficient thin coal seam mining method that has a streamlined production system, high mining and excavation efficiency, high coal resource recovery rate, low waste rock emissions, low mining-induced surface subsidence, and meets the requirements for safe recovery of "three-down" coal resources. Summary of the Invention

[0003] In view of the shortcomings of the existing thin coal seam mining technology, the purpose of the present invention is to provide a full-mining and full-filling drilling method for inclined thin coal seams. This mining method can simplify the production system of the thin coal seam working face, improve the mining and excavation connection efficiency, effectively reduce the emission of waste rock and surface subsidence, and eliminate the coal pillars within and between the working faces, thereby improving the coal resource recovery rate.

[0004] Thin coal seam refers to a coal seam with a thickness of less than 1.3m.

[0005] To achieve the above-mentioned object of the invention, the present invention provides a method for full mining and full filling drilling of inclined thin coal seams, comprising the following steps:

[0006] Step 1: Determine the length L of the working face. The length L of the working face is determined based on the inclination of the coal seam to be mined in the mining area. The working face includes the first mining face and the subsequent working face. The specific standards are as follows:

[0007]

[0008] Step 2: Arrange the preparation tunnel and arrange a mining belt along the inclination line of the coal seam in the mining area to transport it down the mountain;

[0009] Step 3: Arrange the mining roadway of the primary mining face, arrange a filling chute and a drilling chute on both wings of the primary mining face perpendicular to the belt transport downhill in the mining area, and at the end of the primary mining face, connect a return air tunnel perpendicular to the filling chute and the drilling chute along the coal seam inclination to establish a ventilation system, arrange a filling material transportation pipeline in the filling chute, and establish a filling system;

[0010] Step 4: Determine the filling step distance l. The filling step distance l is determined based on the coal seam depth and coal seam roof stability of the coal seam to be mined in the mining area. The specific standards are described in Tables a to c:

[0011] a. The coal seam to be mined in the mining area is a shallow coal seam:

[0012]

[0013] b. The coal seam to be mined in the mining area is a medium-depth coal seam:

[0014]

[0015] c. The coal seam to be mined in the mining area is a deep-buried coal seam:

[0016]

[0017] Step 5: Initial drilling and mining: arranging a spiral drilling machine and a scraper conveyor in the drilling and mining chute, drilling and mining (1+2) m along the direction of the coal seam. Due to the inclination of the coal seam, the drilled coal body slides into the scraper conveyor.

[0018] Step 6, filling drilling and mining, setting the unfilled goaf 2m behind the coal wall of the working face as the filling area, installing hard plates around the filling area to form a closed filling space with the top and bottom plates of the coal seam, opening n filling material transport pipe guide ports on one side of the filling chute on the hard plates, introducing the filling material transport pipe into the filling space through the filling material transport pipe guide ports, and injecting filling material into the filling space. Due to the inclination of the coal seam, the filling material flows downward to occupy the filling space. The injection of the filling material is stopped when the filling space is filled. At the same time, the spiral drill shearer continues to drill for 1m along the strike direction of the coal seam. Due to the inclination of the coal seam, the drilled and mined coal body slides into the scraper conveyor by itself;

[0019] Step 7: Fully mine and fill the working face. Repeat step 6 until the coal seam of the working face is completely mined and the last remaining unfilled goaf is filled.

[0020] Step 8: Arrange the mining roadway of the subsequent working face, use the drilling and mining chute of the previous working face as the filling chute of the subsequent working face, arrange a drilling and mining chute perpendicular to the belt transport downhill of the mining area on the lower wing of the subsequent working face, and connect a return air connecting roadway with the drilling and mining chute at the end of the subsequent working face along the coal seam inclination and perpendicular to the filling chute to establish a ventilation system, and arrange a filling material transportation pipeline in the filling chute of the subsequent working face to establish a filling system;

[0021] Step 9: Fully mine and fill the subsequent working surface, and repeat steps 4 to 7 for the subsequent working surface.

[0022] Step 10: The mining area is fully mined and filled, and steps 8 to 9 are repeated for subsequent working faces in the mining area until all working faces in the mining area are mined and filled.

[0023] Furthermore, in step 1, the method for determining the inclination degree of the coal seam to be mined in the mining area is:

[0024] A1. Obtain the coal seam inclination angle θ data of the coal seam to be mined in the mining area;

[0025] A2. Determine the inclination degree of the coal seam to be mined in the mining area based on the coal seam inclination angle θ: a coal seam with an inclination angle θ between 8 and 25° is a gently inclined coal seam, a coal seam with an inclination angle θ between 25 and 45° is a moderately inclined coal seam, and a coal seam with an inclination angle θ greater than 45° is a steeply inclined coal seam.

[0026] Furthermore, the belt conveyor arranged in step 2 is supported when transporting the mining area down the mountain.

[0027] Furthermore, in step 3 and step 8, the filling chute and the drilling chute are arranged below the coal seam roof, and the roadway floor elevation of the filling chute needs to be higher than the roadway floor elevation of the drilling chute.

[0028] Furthermore, the filling drift, the drilling drift and the return air tunnel arranged in step 3 are supported.

[0029] Furthermore, in step 4, the method for determining the coal seam depth is:

[0030] B1. Obtain the mining depth H data of the coal seam to be mined in the mining area;

[0031] B2. Determine the buried depth of the coal seam to be mined in the mining area based on the mining depth H: coal seams with a mining depth H < 300m are shallow coal seams, coal seams with a buried depth H between 300 and 800m are medium-deep coal seams, and coal seams with a buried depth H > 800m are deep coal seams;

[0032] Furthermore, in step 4, the method for determining the stability of the coal seam roof is:

[0033] C1. Obtain the uniaxial compressive strength σ of the roof of the coal seam to be mined in the mining area c and top plate thickness h data;

[0034] C2, according to the uniaxial compressive strength of the top plate σ c The stability coefficient k of the coal seam roof of the coal seam to be mined in the mining area is calculated by the roof thickness h. The specific calculation method is: k = σ c ·h;

[0035] C3. Determine the stability of the coal seam roof of the coal seam to be mined in the mining area based on the coal seam roof stability coefficient k: the roof with a coal seam roof stability coefficient k less than 26MPa·m is an extremely unstable roof, the roof with a coal seam roof stability coefficient k between 26 and 60MPa·m is an unstable roof, the roof with a coal seam roof stability coefficient k between 60 and 150MPa·m is a moderately stable roof, the roof with a coal seam roof stability coefficient k between 150 and 300MPa·m is a stable roof, and the roof with a coal seam roof stability coefficient k greater than 300MPa·m is an extremely stable roof.

[0036] Furthermore, in step 6, the calculation method of the number n of the guide openings of the filling material transport pipe is: n=0.21, where n is rounded up.

[0037] Furthermore, in step 6, the filling material is a paste filling material whose aggregate is underground gangue and whose auxiliary materials are fly ash and cement.

[0038] Furthermore, before step 8, windbreak walls are installed on the filling chute of the previous working face and the return air tunnel of the previous working face to close them respectively.

[0039] Furthermore, the full-mining and full-filling drilling method for inclined thin coal seams is applicable to coal seams with an inclination angle greater than 8° and a thickness less than 1.3 m.

[0040] Beneficial effects of the present invention:

[0041] The full-mining and full-filling drilling method for inclined thin coal seams provided by the present invention has the following advantages and beneficial effects compared with existing inclined thin coal seam mining technologies:

[0042] 1. Only auger shearer and scraper conveyor are needed to complete the working face mining, without the need for hydraulic supports. This avoids the disadvantages of hydraulic support layout and moving difficulties in thin coal seam mining. The working face production system is simple and the production cost is low.

[0043] 2. Taking advantage of the inclination of the coal seam, the coal mined by the spiral drilling machine can slide into the scraper conveyor by itself, and at the same time, the paste filling material can slide into the closed filling space of the goaf by itself. The filling slurry has good diffusion and filling effects. The working face mining and filling operations are carried out in parallel, the working face advances quickly, and the production efficiency is high.

[0044] 3. Filling the goaf with paste-like filling materials made from abandoned mine gangue can effectively slow down the pressure on the working face, significantly reduce ground subsidence, solve the problem of gangue discharge and accumulation in mine production, realize the utilization of underground solid waste, and promote green mining in mines;

[0045] 4. After the mining of the working face is completed, the drilling and mining channel of the working face can be left along the goaf for the use of the subsequent working face, which can quickly connect the mining between the working faces and achieve high production efficiency;

[0046] 5. The coal resources within and between the working faces can be fully mined, with no coal pillars remaining and a high coal recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a schematic diagram of the first drilling after the first mining face arrangement is completed in the embodiment of the present invention;

[0048] Figure 2 yes Figure 1 AA cross-sectional structural diagram;

[0049] Figure 3 This is a schematic diagram of the first filling drilling after the first drilling is completed on the first mining face of the embodiment of the present invention;

[0050] Figure 4 yes Figure 3 AA cross-sectional structural diagram;

[0051] Figure 5 This is a schematic diagram of the first filling drilling after the first drilling is completed on the first mining face and the subsequent working face is arranged and the first filling drilling is completed in an embodiment of the present invention;

[0052] Figure 6 yes Figure 5 The BB cross-section structure is a schematic diagram of the layout of the first mining face and the subsequent working face preparation tunnel;

[0053] Figure 7 This is a flow chart of the full-mining and full-filling drilling method for inclined thin coal seams of the present invention.

[0054] Among them: 1-belt transport down the mountain in the mining area; 2-filling chute; 3-drilling chute; 4-return air connecting tunnel; 5-first mining face; 6-scraper conveyor; 7-auger shearer; 8-filling material transport pipe; 9-hard plate; 10-filling material stone body; 11-coal seam bottom plate; 12-windbreak wall; 13-subsequent working face; 14-filling chute formed by the drilling chute of the previous working face along the empty tunnel; 15-filling material transport pipe guide port. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution, implementation steps and beneficial effects of the present invention clearer, the following is a further detailed description of the implementation methods and steps of the present invention in conjunction with the accompanying drawings and implementation cases. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0056] The railway covered area within a certain mine field is about 1.62km 2, a total of 14.07 million tons of buried coal resources are buried, of which 3.05 million tons are buried in the 9# coal seam in the second mining area. The 9# coal seam is anthracite, with an average inclination of 15°, an average thickness of 1.0m, and an average burial depth of 480m. The seam roof is composed of mudstone with an average thickness of 1.1m and a uniaxial compressive strength of 15.6MPa. The coal buried beneath the railway in the 9# coal seam in the second mining area is being mined using the full-mining, full-fill drilling method for inclined thin coal seams.

[0057] In this implementation case, the coal seam inclination θ is 15°, so the 9# coal seam is determined to be a gently inclined coal seam. According to the table below, the working face length L is determined to be 75m.

[0058]

[0059] The mining area belt conveyor is arranged along the coal seam inclination line below the coal seam roof, the mining area belt conveyor is supported, and the transportation equipment and filling material transportation pipelines are arranged.

[0060] Below the coal seam roof, a filling chute and a drilling chute were laid out along both wings of the primary mining face, perpendicular to the belt conveyor system in the mining area. The chute sections were rectangular, 2m wide and 2m high. The floor elevation of the filling chute was higher than that of the drilling chute. At the end of the primary mining face, a return air tunnel was constructed, running perpendicularly along the coal seam inclination and through the filling and drilling chute, establishing a ventilation system for the primary mining face. Filling material transport pipelines were laid in the filling chute, establishing a filling system for the primary mining face. Support was provided for the filling chute, drilling chute, and return air tunnel.

[0061] In this implementation case, the coal seam depth H is 480m, and the uniaxial compressive strength of the coal seam roof σ c The pressure is 15.6 MPa, the thickness of the coal seam roof h is 1.1 m, and the calculated stability coefficient k of the 9# coal seam roof is 17.16 MPa·m. Therefore, the 9# coal seam is determined to be a medium-depth coal seam, and the 9# coal seam roof is an extremely unstable roof. According to the table below, the filling step distance l is determined to be 2 m.

[0062]

[0063] An auger shearer and a scraper conveyor are arranged in the drilling chute of the first mining face; the auger shearer is used to drill 4m along the direction of the coal seam. Due to the inclination of the coal seam, the drilled coal body slides into the scraper conveyor, completing the first drilling and mining.

[0064] The unfilled goaf 2m behind the coal wall of the working face is set as the filling area; hard plates are installed around the filling area to form a closed filling space with the top and bottom plates of the coal seam; the number of filling material transport pipe guide ports n is calculated to be 1; a filling material transport pipe guide port is opened on the side of the filling chute on the hard plate, and the filling material transport pipeline is introduced into the filling space through the filling material transport pipe guide port. Paste filling materials are prepared using underground gangue as aggregate and fly ash and cement as auxiliary materials, and transported to the goaf filling area through the filling material transport pipeline; the filling material is injected into the filling space, and due to the inclination of the coal seam, the filling material flows downward to occupy the filling space, and the injection of the filling material is stopped until the filling space is filled. The spiral drill mining machine continues to drill 2m along the strike direction of the coal seam. Due to the inclination of the coal seam, the drilled coal body slides into the scraper conveyor by itself, completing one filling drilling. Figure 1 and Figure 2 shown.

[0065] Carry out the second filling drilling on the first mining face, such as Figure 3 and Figure 4 shown.

[0066] Repeat the backfill drilling and mining on the first mining face until the coal seam of the working face is completely mined and the last remaining unfilled goaf is filled; block the connection between the backfill material transport pipeline in the backfill chute of the first mining face and the backfill material transport pipeline in the downhill belt transport tunnel of the mining area.

[0067] The drilling chute of the first mining face is left along the empty lane as the filling chute of the subsequent working face; a drilling chute is arranged on the lower wing of the subsequent working face perpendicular to the belt transport down the mountain in the mining area, and is supported; windbreak walls are installed in the filling chute of the first mining face and the return air tunnel of the first mining face to close them; at the end of the subsequent working face, a return air tunnel is passed through the filling chute and the drilling chute along the inclination of the coal seam, perpendicular to the filling chute, and supported to establish a ventilation system for the subsequent working face; a filling material transportation pipeline is arranged in the filling chute of the subsequent working face, and a filling system for the subsequent working face is established.

[0068] An auger shearer and a scraper conveyor are arranged in the drilling chute of the subsequent working face; the auger shearer is used to drill 4m along the direction of the coal seam. Due to the inclination of the coal seam, the drilled coal body slides into the scraper conveyor, completing the first drilling.

[0069] The unfilled goaf 2m behind the coal wall of the working face is set as the filling area; hard plates are installed around the filling area to form a closed filling space with the top and bottom plates of the coal seam; the number of filling material transport pipe guide ports n is calculated to be 1; a filling material transport pipe guide port is opened on the side of the filling chute on the hard plate, and the filling material transport pipeline is introduced into the filling space through the filling material transport pipe guide port. Paste filling materials are prepared with underground gangue as aggregate and fly ash and cement as auxiliary materials, and transported to the goaf filling area through the filling material transport pipeline; the filling material is injected into the filling space. Due to the inclination of the coal seam, the filling material flows downward to occupy the filling space. The injection of the filling material is stopped until the filling space is filled. The spiral drill mining machine continues to drill 2m along the strike direction of the coal seam. Due to the inclination of the coal seam, the drilled coal body slides into the scraper conveyor, completing one filling drilling, and the second filling drilling is carried out on the subsequent working face. Figure 5 and Figure 6 shown.

[0070] Repeat the backfill drilling and mining on the subsequent working face until the coal seam of the working face is completely mined and the last remaining unfilled goaf is filled; block the connection between the backfill material transport pipeline in the filling chute of the first mining face and the backfill material transport pipeline in the downhill belt transport tunnel of the mining area.

[0071] Drilling and filling are carried out on the remaining working faces in the mining area.

[0072] Obviously, the above examples are only illustrative examples to more clearly illustrate the scheme and steps of the present invention, and are not specific limitations on the implementation scheme and steps. For professional and technical personnel in the relevant field, the above technical scheme and implementation steps can be modified and changed in various forms, which do not need to be listed here one by one. Other modifications and changes derived from this technical scheme still fall within the scope of protection of the present invention.

Claims

1. A full-mining and full-filling drilling method for inclined thin coal seams, characterized in that: The following steps are involved: Step 1: Determine the length of the working surface L , determine the length of the working face according to the inclination of the coal seam to be mined in the mining area L The working face includes the first mining face and the subsequent working face. The specific standards are as follows: When the coal seam is gently inclined, the length of the working face is L 60~90m; When the coal seam is moderately inclined, the working face length L 90~150m; When the coal seam is steeply inclined, the length of the working face L >150m; Step 2: Arrange the preparation tunnel and arrange a mining belt along the inclination line of the coal seam in the mining area to transport it down the mountain; Step 3: Arrange the mining roadway of the primary mining face, arrange a filling chute and a drilling chute on both wings of the primary mining face perpendicular to the belt transport downhill in the mining area, and at the end of the primary mining face, connect a return air tunnel perpendicular to the filling chute and the drilling chute along the coal seam inclination to establish a ventilation system, arrange a filling material transportation pipeline in the filling chute, and establish a filling system; Step 4: Determine the filling pitch l The filling step distance is determined according to the coal seam depth and coal seam roof stability of the coal seam to be mined in the mining area. l , the specific standards are as follows: When the coal seam to be mined in the mining area is a shallow buried coal seam, the filling step distance of the extremely unstable coal seam roof should be l 3m, for unstable coal seam roof filling step distance l 3 to 6 m, for medium stable coal seam roof filling step distance l 6 to 10 m, for a stable coal seam roof filling step l 10 to 15 m, for extremely stable coal seam roof filling step distance l 15 to 25 m; When the coal seam to be mined in the mining area is a medium-depth coal seam: for extremely unstable coal seam roof filling step l 2m, for unstable coal seam roof filling step distance l 2 to 4 m, for medium stable coal seam roof filling step distance l 4 to 8 m, for a stable coal seam roof filling step l 8 to 12 m, for extremely stable coal seam roof filling step l 12~20m; When the coal seam to be mined in the mining area is a deep-buried coal seam: for extremely unstable coal seam roof filling step l 1.5m, for unstable coal seam roof filling step distance l 1.5 to 3m, for medium stable coal seam roof filling step distance l 3 to 6 m, for a stable coal seam roof filling step l 6 to 9 m, for extremely stable coal seam roof filling step l 9 to 15m; Step 5: First drilling and mining: arranging a spiral drilling machine and a scraper conveyor in the drilling and mining chute, and drilling and mining along the direction of the coal seam ( l +2)m, due to the inclination of the coal seam, the drilled coal body slides into the scraper conveyor; Step 6: Backfill drilling and mining. Set the unfilled goaf 2m behind the coal wall of the working face as the backfill area. Install hard plates around the backfill area to form a closed backfill space with the top and bottom plates of the coal seam. Open the hard plates on one side of the backfill channel. n A filling material transport pipe guide port is provided, and the filling material transport pipe is introduced into the filling space through the filling material transport pipe guide port, and the filling material is injected into the filling space. Due to the inclination of the coal seam, the filling material flows downward to occupy the filling space. When the filling space is filled, the injection of the filling material is stopped, and at the same time, the spiral drill coal mining machine continues to drill along the direction of the coal seam. l m. Due to the inclination of the coal seam, the drilled coal body slides into the scraper conveyor; Step 7: Fully mine and fill the working face. Repeat step 6 until the coal seam of the working face is completely mined and the last remaining unfilled goaf is filled. Step 8: Arrange the mining roadway of the subsequent working face, use the drilling and mining chute of the previous working face as the filling chute of the subsequent working face, arrange a drilling and mining chute perpendicular to the belt transport downhill of the mining area on the lower wing of the subsequent working face, and connect a return air connecting roadway with the drilling and mining chute at the end of the subsequent working face along the coal seam inclination and perpendicular to the filling chute to establish a ventilation system, and arrange a filling material transportation pipeline in the filling chute of the subsequent working face to establish a filling system; Step 9: Fully mine and fill the subsequent working surface, and repeat steps 4 to 7 for the subsequent working surface; Step 10: The mining area is fully mined and filled, and steps 8 to 9 are repeated for subsequent working faces in the mining area until all working faces in the mining area are mined and filled.

2. The method for full mining and full filling drilling of inclined thin coal seams according to claim 1 is characterized in that: In step 1, the method for determining the inclination of the coal seam to be mined in the mining area is: A1. Obtain the inclination of the coal seam to be mined in the mining area θ data; A2. According to the inclination of coal seam θ Determine the inclination of the coal seam to be mined in the mining area: coal seam inclination θ Coal seams with an inclination of 8 to 25 degrees are called gently inclined coal seams. θ Coal seams with an inclination angle of 25 to 45 degrees are medium-inclined coal seams. θ Coal seams with an angle of >45° are steeply inclined coal seams.

3. The method for full mining and full filling drilling of inclined thin coal seams according to claim 1 is characterized in that: In step 3 and step 8, the filling chute and the drilling chute are arranged below the coal seam roof, and the roadway floor elevation of the filling chute is higher than the roadway floor elevation of the drilling chute.

4. The method for full mining and full filling drilling of inclined thin coal seams according to claim 1 is characterized in that: In step 4, the method for determining the coal seam depth is: B1. Obtain the mining depth of the coal seam to be mined in the mining area H data; B2. According to the mining depth H Determine the depth of the coal seam to be mined in the mining area: mining depth H Coal seams less than 300 m are shallow coal seams, and coal seams with a depth of H Coal seams between 300 and 800 m are classified as medium-depth coal seams. H Coal seams >800 m are deep coal seams.

5. The method for full mining and full filling drilling of inclined thin coal seams according to claim 1 is characterized in that: In step 4, the method for determining the stability of the coal seam roof is: C1. Obtain the uniaxial compressive strength of the roof of the coal seam to be mined in the mining area σ c and top plate thickness h data; C2, according to the uniaxial compressive strength of the top plate σ c and top plate thickness h Calculate the stability coefficient of the coal seam roof in the mining area k , the specific calculation method is: k = σ c · h ; C3, according to the stability coefficient of coal seam roof k Determine the coal seam roof stability of the coal seam to be mined in the mining area: coal seam roof stability coefficient k The roof with a pressure less than 26 MPa·m is considered extremely unstable and the stability coefficient of the coal seam roof is k The roof at 26-60 MPa·m is unstable roof, and the stability coefficient of coal seam roof is k The roof with a pressure between 60 and 150 MPa·m is considered to be moderately stable. k The roof pressure between 150 and 300 MPa·m is considered stable roof, and the stability coefficient of coal seam roof is k The roof with a pressure greater than 300 MPa·m is considered to be extremely stable.

6. The method for full mining and full filling drilling of inclined thin coal seams according to claim 1 is characterized in that: In step 6, the number of guide ports of the filling material transport pipe is n The calculation method is: n =0.2 l , n Round up.

7. The method for full mining and full filling drilling of inclined thin coal seams according to claim 1 is characterized in that: In step 6, the filling material is a paste filling material whose aggregate is underground gangue and whose auxiliary materials are fly ash and cement.

8. The method for full mining and full filling drilling of inclined thin coal seams according to claim 1 is characterized in that: Before step 8, windbreak walls are installed on the filling chute of the previous working face and the return air tunnel of the previous working face to close them.

9. The method for full mining and full filling drilling of inclined thin coal seams according to claim 1 is characterized in that: The coal seam has an inclination angle greater than 8° and a thickness less than 1.3m.

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