Grouting and filling mining method for different inclined coal seams

Abstract

The present application provides a kind of different inclined coal seam grouting filling mining method, comprising: step S10: the constitutive model between the inclination of coal seam and the concentration of filling slurry is constructed;Step S20: the amount of filling slurry in goaf is estimated according to the length L of working face and the coal mining height, and the concentration of filling slurry is determined according to the constitutive model and the inclination of coal seam;Step S30: laying filling pipeline on working face, and carrying out grouting filling.The present application solves the problem of low filling efficiency in the prior art of inclined coal seam grouting filling mining.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coal mining, in particular to a different inclined coal seam grouting filling mining method. BACKGROUND

[0002] Inclined coal seams account for a large proportion of coal reserves, and filling coal mining technology is one of the effective technical approaches to solving ecological environmental problems such as surface subsidence and gangue discharge. Filling mining of inclined coal seams has become an important problem that needs to be solved in the coal industry. At present, gangue self-sloughing is often used for filling mining of inclined coal seams, but this method is greatly affected by the inclination of the coal seam, the particle size of the gangue, and the conditions of the roof and floor, and has a great impact on the normal operation of the working face, and the filling efficiency is low.

[0003] In view of this, in recent years, a large-inclination coal seam goaf combined grouting filling mining method (CN108222938A) and a grouting mining method suitable for inclined coal seams (CN106869934A) have been disclosed. These patents have carefully considered the filling mining of single-inclination inclined coal seams, but the influence of different slurry concentrations on the mining operation during the grouting mining of different inclined coal seams has not been involved. Since the slurry concentration is closely related to the inclination of the coal seam, too low a slurry concentration will result in too low early strength of the filling body after filling the goaf, and too long initial and final setting times will make it difficult for the filling body to stand alone, while too high a slurry concentration will cause too large a pumping pressure, making it difficult for the slurry to flow uniformly during self-sloughing filling, resulting in poor filling effect.

[0004] That is, the existing technology has the problem of low filling efficiency in the grouting filling mining of inclined coal seams. SUMMARY

[0005] The main purpose of the present application is to provide a different inclined coal seam grouting filling mining method to solve the problem of low filling efficiency in the grouting filling mining of inclined coal seams in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a different inclined coal seam grouting filling mining method is provided, comprising: step S10: constructing a constitutive model between the inclination of the coal seam and the concentration of the filling slurry; step S20: estimating the amount of filling slurry for the goaf according to the length L of the working face and the coal mining height, and determining the concentration of the filling slurry according to the constitutive model and the inclination of the coal seam; step S30: laying a filling pipeline on the working face and performing grouting filling.

[0007] Further, in step S10, the concentration of the filling slurry and the relationship between the inclination of the coal seam are determined; the constitutive model between the inclination of the coal seam and the concentration of the filling slurry is determined according to the relationship between the concentration of the filling slurry and the inclination of the coal seam.

[0008] Further, the step S10 further comprises: obtaining formula (3-1) representing the relationship between the concentration of the filling slurry and the inclination of the coal seam according to formula (1-1) and formula (2-1),

[0009]

[0010] Q = N / a*tan a formula (2-1);

[0011]

[0012] According to formula (3-1), formula (4-1) representing the constitutive model between the inclination of the coal seam and the concentration of the filling slurry is obtained,

[0013]

[0014] wherein Q is the cumulative mass flow rate of the slurry, unit: kg; a is the self-flowing acceleration of the slurry, unit: m / s 2 ; N is the support force, unit: N; a is the inclination of the coal seam, unit: °; p is the density of the slurry, unit: kg / m 3 ; t is the grouting time, unit: s; S is the cross-sectional area of the grouting pipeline, unit: m 2 ; v is the flow rate of the slurry, unit: m / s; M is the mass of the filling material, unit: kg; C is the concentration of the filling slurry, unit: %; k is the adjustment coefficient, dimensionless.

[0015] Further, in the process of obtaining formula (4-1) representing the constitutive model between the inclination of the coal seam and the concentration of the filling slurry according to formula (3-1), the self-flowing acceleration a of the slurry and the support force N remain unchanged, the model is simplified, and formula (4-1) is obtained by introducing the adjustment coefficient k.

[0016] Further, the step S20 comprises: estimating the amount of the filling slurry in the goaf according to the length L of the working face and the mining height; determining the adjustment coefficient k according to the amount of the filling slurry in the goaf and the inclination of the coal seam; and determining the concentration of the filling slurry according to the adjustment coefficient k and formula (4-1).

[0017] Further, in the process of determining the adjustment coefficient according to the amount of the filling slurry in the goaf and the inclination of the coal seam: when the inclination of the coal seam is 5° to 25°, the adjustment coefficient k is selected from the values 2.3 to 16.3; when the inclination of the coal seam is 25° to 45°, the adjustment coefficient k is selected from the values 1.1 to 12.7; and when the inclination of the coal seam is 45° to 60°, the adjustment coefficient k is selected from the values 0.6 to 1.43.

[0018] Further, in the process of determining the concentration of the filling slurry according to the adjustment coefficient and formula (4-1), further comprising: if the concentration of the filling slurry is in the range of 70% to 90%, the adjustment coefficient does not need to be adjusted again; if the concentration of the filling slurry is less than 70% or greater than 90%, the adjustment coefficient needs to be selected again.

[0019] Further, the step S30 comprises: laying the filling pipeline on the working face; the coal cutter cuts coal, the hydraulic support pushes and moves the support, and the filling slurry reaches the working face grouting roadway through the transportation roadway; when the working face advances by a preset distance, the working face grouting pipeline and the return air roadway grouting pipeline are opened at the same time through the control of the stop valve; and the grouting and filling is started in the order from top to bottom.

[0020] Further, in the process of laying the filling pipeline on the working face, the working face grouting pipeline is laid along the bottom plate of the hydraulic support; the grouting pipeline is laid along the inclination of the coal seam at a preset interval; the return air roadway grouting pipeline is laid on the side of the gob-side entry retaining wall in the return air roadway; the gob-side entry retaining wall grouting pipeline is arranged in the gob-side entry retaining wall, and the entire gob-side entry retaining wall is tamped with the migration of the hydraulic support.

[0021] Further, in the process of opening the working face grouting pipeline and the return air roadway grouting pipeline at the same time through the control of the stop valve when the working face advances by a preset distance, the preset distance of the working face advancing is selected from the range of 25 meters to 30 meters.

[0022] The technical scheme of the present application comprises: step S10: constructing the constitutive model between the inclination of the coal seam and the concentration of the filling slurry; step S20: estimating the amount of the filling slurry in the goaf according to the length L of the working face and the coal mining height, and determining the concentration of the filling slurry according to the constitutive model and the inclination of the coal seam; and step S30: laying the filling pipeline on the working face and carrying out grouting and filling.

[0023] The constitutive model between the inclination of the coal seam and the concentration of the filling slurry is constructed through step S10, the mechanical model of filling the goaf is simplified, the various parameters in the process of grouting and filling mining of different inclined coal seams are connected, and the relationship between the inclination of the coal seam and the concentration of the filling slurry is analyzed. The constitutive model between the inclination of the coal seam and the concentration of the filling slurry is constructed, the concentration of the filling slurry can be determined according to the inclination of the coal seam, the filling process is ensured to proceed smoothly, the filling effect is ensured, and accidents such as ground subsidence are avoided.

[0024] The amount of the filling slurry for the goaf is estimated according to the length L of the working face and the coal mining height by step S20, and the concentration of the filling slurry is determined according to the constitutive model and the dip angle of the coal seam. Reasonable estimation of the amount of the filling slurry for the goaf can ensure the smooth progress of the filling process and improve the filling efficiency. The concentration of the filling slurry is determined by using the constitutive model, which ensures the uniform and smooth progress of the filling process, improves the filling efficiency, and further ensures the filling effect.

[0025] The filling pipeline is laid on the working face by step S30, and the grouting and filling are performed. The filling slurry with the determined concentration and amount is filled along the filling pipeline to realize the grouting and filling operation. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application, serve to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0027] Figure 1 A constitutive model diagram of the dip angle of the coal seam and the concentration of the filling slurry in an optional embodiment of the present application is shown;

[0028] Figure 2 A cross-sectional view of an angle of the grouting and filling area of the inclined coal seam in Figure 1 is shown;

[0029] Figure 3 A cross-sectional view of the 1-1 position in Figure 2 is shown;

[0030] Figure 4 A flowchart of the grouting and filling mining method of different inclined coal seams is shown.

[0031] In the above drawings, the following reference signs are included:

[0032] 1, coal seam; 2, goaf; 3, along-wall roadway wall; 4, return air roadway grouting pipeline; 5, grouting pipe; 6, stop valve; 7, hydraulic support; 8, along-wall roadway wall grouting pipeline; 9, return air roadway; 10, transportation roadway; 11, working face grouting pipeline; 12, lower stratum. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] In the present application, the orientation words such as "upper, lower, top, bottom" used without the opposite description are generally directed to the direction shown in the drawings, or directed to the vertical, perpendicular or gravity direction of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0036] In order to solve the problem of low filling efficiency of inclined coal seam grouting and filling mining in the prior art, the present application provides a different inclined coal seam grouting and filling mining method.

[0037] As shown in Figures 1 to 4 The different inclined coal seam grouting and filling mining method comprises the following steps: step S10, constructing a constitutive model between the inclination of the coal seam 1 and the concentration of the filling slurry; step S20, estimating the amount of filling slurry for the goaf 2 according to the length L of the working face and the coal mining height, and determining the concentration of the filling slurry according to the constitutive model and the inclination of the coal seam 1; and step S30, laying the filling pipeline on the working face and carrying out grouting and filling.

[0038] The constitutive model between the inclination of the coal seam 1 and the concentration of the filling slurry is constructed through step S10, which simplifies the mechanical model of filling the goaf 2, and is beneficial to establish the connection between various parameters in the process of grouting and filling mining of different inclined coal seams 1, and is convenient for analyzing the relationship between the inclination of the coal seam 1 and the concentration of the filling slurry. Through the construction of the constitutive model between the inclination of the coal seam 1 and the concentration of the filling slurry, the concentration of the filling slurry can be quickly determined according to the inclination of the coal seam 1 for rapid filling, while ensuring that the concentration of the filling slurry is within a reasonable range, ensuring the smooth progress of the filling process, having a good filling effect, and avoiding accidents such as ground subsidence.

[0039] The amount of filling slurry for the goaf 2 is estimated according to the length L of the working face and the coal mining height through step S20, and the concentration of the filling slurry is determined according to the constitutive model and the inclination of the coal seam 1. Reasonably estimating the amount of filling slurry for the goaf 2 can preliminarily know the approximate amount of filling material, so as to reasonably adjust the approximate amount of various coal-based solid waste materials according to the constitutive model, so as to reduce the waste of materials. The concentration of the filling slurry is determined by using the constitutive model, which ensures that the filling process is uniform and smooth, improves the filling efficiency, and can also ensure the filling effect.

[0040] The filling pipeline is laid on the working face through step S30, and grouting and filling are carried out. The filling slurry with the determined concentration and amount is filled along the filling pipeline to realize the grouting and filling operation.

[0041] Specifically, in step S10, the relationship between the concentration of the filling slurry and the dip angle of the coal seam 1 is determined, and a constitutive model between the dip angle of the coal seam 1 and the concentration of the filling slurry is determined according to the relationship between the concentration of the filling slurry and the dip angle of the coal seam 1. Since the concentration of the filling slurry required is different at different dip angles of the coal seam 1, the relationship between the dip angle of the coal seam 1 and the concentration of the filling slurry needs to be determined in order to determine the constitutive model between the dip angle of the coal seam 1 and the concentration of the filling slurry.

[0042] Specifically, in step S10, a formula (3-1) representing the relationship between the concentration of the filling slurry and the dip angle of the coal seam 1 is obtained according to formula (1-1) and formula (2-1),

[0043]

[0044] Q = N / a tan a formula (2-1);

[0045]

[0046] A formula (4-1) representing the constitutive model between the dip angle of the coal seam 1 and the concentration of the filling slurry is obtained according to formula (3-1),

[0047]

[0048] wherein Q is the cumulative mass flow rate of the slurry, in kg; a is the self-slip acceleration of the slurry, in m / s 2 ; N is the support force, in N; a is the dip angle of the coal seam, in °; p is the density of the slurry, in kg / m 3 ; t is the grouting time, in s; S is the cross-sectional area of the grouting pipe, in m 2 ; v is the flow rate of the slurry, in m / s; M is the mass of the filling material, in kg; C is the concentration of the filling slurry, in %; k is the adjustment coefficient, dimensionless.

[0049] According to the constitutive model between the dip angle of the coal seam 1 and the concentration of the filling slurry, the concentration of the filling slurry and the dip angle of the coal seam 1 are inversely related. When the dip angle of the coal seam 1 is too large, the concentration of the filling slurry needs to be reduced, and when the dip angle of the coal seam 1 is too small, the concentration of the filling slurry needs to be increased. In order to ensure uniform and smooth grouting and filling, the relationship between the dip angle of the coal seam 1 and the concentration of the filling slurry needs to be coordinated, and running and slurry collapse after grouting also needs to be prevented.

[0050] Specifically, in the process of obtaining formula (4-1) representing the constitutive model between the inclination of coal seam 1 and the concentration of the filled slurry according to formula (3-1), the following steps are included: simplifying the constitutive model by keeping the slurry self-flowing acceleration a and the support force N unchanged; introducing the adjustment coefficient k to obtain formula (4-1). By simplifying the constitutive model by keeping the slurry self-flowing acceleration a and the support force N unchanged, it is beneficial to more intuitively determine the relationship between the inclination of coal seam 1 and the concentration of the filled slurry, and by introducing the adjustment coefficient k to reduce the error, it is ensured that the concentration of the filled slurry can adapt to the inclination of coal seam 1.

[0051] It should be noted that, in formula (4-1), Qg represents the gravity of the slurry. Figure 1 In the process of simplifying the constitutive model, the acceleration a and the support force N are ideally constant, so a multiplied by N is a constant, but in actual conditions, a multiplied by N is dynamically changing, so the adjustment coefficient k is introduced to replace it, so that the adjustment coefficient k is different in different environments.

[0052] Specifically, in step S20, the following steps are included: estimating the amount of slurry filled in goaf 2 according to the length L of the working face and the mining height; determining the adjustment coefficient k according to the amount of slurry filled in goaf 2 and the inclination of coal seam 1; determining the concentration of the filled slurry according to the adjustment coefficient k and formula (4-1). According to the actual length L of the working face and the mining height, the amount of slurry required can be estimated, and then according to the inclination of coal seam 1, the adjustment coefficient k can be determined, so that the concentration of the filled slurry is obtained by using the constitutive model, and the filling process is ensured to proceed smoothly.

[0053] Specifically, in the process of determining the adjustment coefficient according to the amount of slurry filled in goaf 2 and the inclination of coal seam 1, when the inclination of coal seam 1 is 5° to 25°, the adjustment coefficient k is selected from the values 2.3 to 16.3; when the inclination of coal seam 1 is 25° to 45°, the adjustment coefficient k is selected from the values 1.1 to 12.7; when the inclination of coal seam 1 is 45° to 60°, the adjustment coefficient k is selected from the values 0.6 to 1.43. When the inclination of coal seam 1 is 5° to 25°, the slurry self-flowing condition is poor, and the slurry concentration needs to be adjusted to be smaller. Selecting different adjustment coefficients k under different inclinations of coal seam 1 facilitates the adjustment of the concentration of the filled slurry. That is, the larger the inclination of coal seam 1, the better the slurry self-flowing condition, and at this time, the adjustment coefficient k does not need to be too large, and it is ensured that the concentration of the filled slurry is within a reasonable range. According to the experience formula for adjusting the adjustment coefficient k according to the commonly used concentration of the slurry and the amount of the filling material.

[0054] Specifically, in the process of determining the concentration of the filling slurry according to the adjustment coefficient and formula (4-1), if the concentration of the filling slurry is in the range of 70% to 90%, the adjustment coefficient does not need to be adjusted; if the concentration of the filling slurry is less than 70% or greater than 90%, the adjustment coefficient needs to be reselected. Limiting the concentration of the filling slurry in a reasonable range can avoid the problem of pipe blockage in the filling process; if the concentration of the filling slurry cannot meet the actual operation requirements, the adjustment coefficient needs to be adjusted so that the filling slurry is in a reasonable range, meets the filling requirements, and ensures the smooth progress of the filling process.

[0055] Specifically, the step S30 comprises: laying the filling pipeline on the working face; the coal mining machine cuts coal, the hydraulic support 7 pushes and moves the support, and the filling slurry reaches the working face grouting roadway through the transportation roadway 10; when the working face advances by a preset distance, the working face grouting pipeline 11 and the return air roadway grouting pipeline 4 are controlled to be opened simultaneously by the stop valve 6; and the grouting and filling are started in the order from top to bottom. The whole mining operation and filling work are established on the lower rock stratum 12, the grouting pipeline is laid at the corresponding position so that the filling slurry reaches the filling position along the grouting pipeline, and after the coal mining work advances for a period of time, the stop valve 6 of the working face grouting pipeline 11 and the return air roadway grouting pipeline 4 is opened simultaneously to complete the grouting and filling work in the order from top to bottom.

[0056] Specifically, in the process of laying the filling pipeline on the working face, the working face grouting pipeline 11 is laid along the bottom plate of the hydraulic support 7; the grouting pipeline 5 is laid along the coal seam 1 at a preset interval; the return air roadway grouting pipeline 4 is laid along the empty roadway wall 3 on one side of the return air roadway 9; and the empty roadway wall grouting pipeline 8 is arranged in the empty roadway wall 3, and the whole empty roadway wall 3 is rammed with the migration of the hydraulic support 7. The pipelines are laid at the working face, the coal seam 1, the return air roadway 9 and the empty roadway, so that the filling slurry can reach the filling position along the pipeline to complete the filling work. The pipelines are laid at a certain interval, which can improve the filling efficiency and ensure the filling effect.

[0057] Specifically, in the process of controlling the working face grouting pipeline 11 and the return air roadway grouting pipeline 4 to be opened simultaneously by the stop valve 6 when the working face advances by a preset distance, the preset distance of the working face advance is selected from the range of 25 meters to 30 meters. After the working face advances by a certain range, the filling work is started, which ensures that the filling work is carried out in time without affecting the normal coal mining work, avoids the danger of the goaf 2 collapse, ensures the filling effect, and guarantees the safety in the roadway.

[0058] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0059] 1. By establishing a constitutive model of the dip angle of inclined coal seam 1 and the concentration of filling slurry, the corresponding concentration of filling slurry can be obtained for grouting mining of coal seam 1 with different dip angles, ensuring the smooth progress of the filling process.

[0060] 2. By setting the adjustment coefficient k, the concentration of the filling grout can be better controlled, ensuring the filling effect.

[0061] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0062] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0063] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for different inclined coal seam grouting and filling mining, characterized in that, The method comprises the following steps: Step S10: constructing a constitutive model between the dip angle of the coal seam (1) and the concentration of the filling slurry; Step S20: estimating the amount of filling slurry for the goaf (2) according to the length L of the working face and the mining height, and determining the concentration of the filling slurry according to the constitutive model and the dip angle of the coal seam (1); Step S30: laying the filling pipeline on the working face and performing grouting and filling; In the step S10, further comprising: determining the relationship between the concentration of the filling slurry and the dip angle of the coal seam (1); determining the constitutive model between the dip angle of the coal seam (1) and the concentration of the filling slurry according to the relationship between the concentration of the filling slurry and the dip angle of the coal seam (1); In the step S10, further comprising: obtaining formula (3-1) representing the relationship between the concentration of the filling slurry and the dip angle of the coal seam (1) according to formula (1-1) and formula (2-1), Equation (1-1); Equation (2-1); Equation (3-1); obtaining formula (4-1) representing the constitutive model between the dip angle of the coal seam (1) and the concentration of the filling slurry according to formula (3-1), Equation (4-1); Wherein, Q is the cumulative mass flow of slurry, unit is kg; a is the self-sloughing acceleration of slurry, unit is m / s 2 ; N is the supporting force, unit is N; α is the inclination of coal seam, unit is °; ρ is the density of slurry, unit is kg / m 3 ; t is the grouting time, unit is s; S is the cross-sectional area of grouting pipeline, unit is m 2 ; v is the flow rate of slurry, unit is m / s; M is the mass of filling material, unit is kg; C is the concentration of filling slurry, unit is %; k is the adjustment coefficient, dimensionless.

2. The different-inclined coal seam grouting and filling mining method according to claim 1, characterized in that, In the process of obtaining formula (4-1) representing the constitutive model between the dip angle of the coal seam (1) and the concentration of the filling slurry according to formula (3-1), comprising: keeping the slurry self-sliding acceleration a and the support force N unchanged, and simplifying the constitutive model; introducing an adjustment coefficient k to obtain the formula (4-1).

3. The method according to claim 1, wherein, In the step S20, comprising: estimating the amount of filling slurry for the goaf (2) according to the length L of the working face and the mining height; determining the adjustment coefficient k according to the amount of filling slurry for the goaf (2) and the dip angle of the coal seam (1); determining the concentration of the filling slurry according to the adjustment coefficient k and formula (4-1).

4. The different-inclined coal seam grouting and filling mining method according to claim 3, characterized in that, In the process of determining the adjustment coefficient according to the amount of filling slurry for the goaf (2) and the dip angle of the coal seam (1), comprising: when the dip angle of the coal seam (1) is 5° to 25°, the adjustment coefficient k is selected from the values 2.3 to 16.3; when the dip angle of the coal seam (1) is 25° to 45°, the adjustment coefficient k is selected from the values 1.1 to 12.7; when the dip angle of the coal seam (1) is 45° to 60°, the adjustment coefficient k is selected from the values 0.6 to 1.

43.

5. The different-inclined coal seam grouting and filling mining method according to claim 3, characterized in that, In the process of determining the concentration of the filling slurry according to the adjustment coefficient and formula (4-1), further comprising: if the concentration of the filling slurry is in the range of 70% to 90%, the adjustment coefficient does not need to be adjusted again; if the concentration of the filling slurry is less than 70% or greater than 90%, the adjustment coefficient needs to be selected again.

6. The different-inclined coal seam grouting and filling mining method according to claim 3, characterized in that, The step S30 comprises: laying the filling pipeline on the working face; the coal mining machine cuts coal, the hydraulic support (7) pushes and moves the support, and the filling slurry reaches the working face grouting roadway through the transportation roadway (10); when the working face advances a preset distance, the working face grouting pipeline (11) and the return air roadway grouting pipeline (4) are controlled to be opened simultaneously by the stop valve (6); grouting and filling is started in the order from top to bottom.

7. The different-inclined coal seam grouting and filling mining method according to claim 6, characterized in that, In the process of laying the filling pipeline on the working face, comprising: The working face grouting pipeline (11) is laid along the bottom plate of the hydraulic support (7); The grouting pipe (5) is laid along the inclination of the coal seam (1) at a preset interval; The air return roadway grouting pipeline (4) is laid on the side of the gob-side entry retaining wall (3) of the air return roadway (9); The gob-side entry retaining wall grouting pipeline (8) is arranged in the gob-side entry retaining wall (3), and the entire gob-side entry retaining wall (3) is compacted with the hydraulic support (7) moving.

8. The different-inclined coal seam grouting and filling mining method according to claim 6, characterized in that, When the working face advances by a preset distance, the working face grouting pipeline (11) and the air return roadway grouting pipeline (4) are controlled to be opened simultaneously through the stop valve (6), and the preset distance of the working face advancing is selected from the range of 25 meters to 30 meters.

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