A method of stope mining using non-pillaring supports during the stope

Abstract

The application provides a filling mining method using non-filling support in an overlying mining process. Since the non-filling hydraulic support is difficult to form a closed space after the support, the metal net and the filling cloth are laid on the top beam of the support, fixed on the coal wall of the goaf behind the support, and then the end support is modified and the side guard plate is added to top the baffle on the roadway side to form a closed space to prevent slurry leakage. Then, the goaf is filled with high-concentration cemented filling slurry. The laying of the metal net and the filling cloth is completed on the side coal wall of the recovery, the interfaces of the metal net are fixed and connected by iron wire, the interfaces of the filling cloth are connected by an anti-explosion sewing machine, and finally the filling mining of the whole goaf is completed, which relatively reduces the input cost of the coal mine, increases the economic benefit of the coal mine, solves the contradiction between the filling mining and the matching equipment, and provides a new idea for the filling mining of high-concentration cemented filling slurry using non-filling support.

Description

Technical Field

[0001] This invention relates to the field of coal mine backfilling technology, and in particular to a backfilling mining method using non-backfilling supports during overhead mining. Background Technology

[0002] Currently, many coal mines in my country face the challenge of re-mining coal resources. A significant portion of these resources are protective coal pillars left over from early "three-under" mining (underground, underground, and underground mining). Often, the mining face of these pillars is not horizontal or near-horizontal. Considering the current working face and existing technology and equipment, the difficulty of re-mining coal resources is undoubtedly increased because non-filling hydraulic supports cannot form a sealed space behind them. This is mainly reflected in two aspects: firstly, high-concentration filling slurry cannot be confined in the goaf in a short time, easily leading to slurry leakage; secondly, there is no rear roof beam behind the non-filling supports, making the roof prone to subsidence. Therefore, to solve these problems, a filling mining method using non-filling supports during overhead mining has become an effective solution.

[0003] This method increases the flexibility of equipment matching. The filling operation time can also be freely adjusted according to the filling needs, which greatly improves the utilization rate of the fillable space in the goaf, while also increasing the filling rate of the goaf, ensuring the filling effect, and providing a new approach to filling mining. Summary of the Invention

[0004] The embodiments of the present invention provide a backfilling mining method using non-backfilling supports during overhead mining, which solves the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] A backfilling mining method using non-backfilling supports during overhead mining, comprising:

[0007] S1 first opens the hole, and the filling pipe is laid from the bottom chamber through the auxiliary haulage roadway to the working face along the track transport roadway. Then, a flexible hose is laid behind the scraper conveyor baffle along the working face. After exiting the working face, the pipeline is laid along the belt conveyor roadway until the working face water release roadway. During the continuous advancement of the coal mining face, material distribution pipes are set at both ends to fill the goaf.

[0008] During the upward mining process, S2 is secured to the coal face in the goaf behind the support by a metal mesh and filling fabric laid on the top beam of the support. The end support is then modified, and side guards are added to create a sealed space against the roadway wall to prevent grout leakage. The goaf is then filled with high-concentration cemented filling grout.

[0009] The S3 metal mesh and filling fabric are laid on the side of the coal face during mining. The joints of the metal mesh are fixed with wire, and the joints of the filling fabric are connected with an explosion-proof sewing machine. The support is advanced forward, and the metal mesh and filling fabric extend to the rear of the goaf.

[0010] During the S4 filling process, the high-concentration filling slurry is first drawn into the void created during the support advancement process due to gravity. As the slurry level rises, it flows into the triangular area created in the previous cycle to complete the connection.

[0011] The S5 pusher scraper conveyor moves the hydraulic support, and the working face hose is pushed forward together. After pushing forward an appropriate distance, a section of the pipeline is disassembled at the same time to enter the next cycle.

[0012] S6 Repeat steps S3, S4 and S5 until the goaf filling operation is completed.

[0013] The backfilling operation involves supplying backfill slurry to the goaf. This slurry consists of coal gangue and fly ash, as well as cementing materials (usually cement), additives, and water. The hydraulic supports used are standard fully mechanized hydraulic supports.

[0014] Preferably, the discharge pipe in the goaf has two discharge ports spaced apart, located at two different ends.

[0015] Preferably, since it is difficult for non-filled hydraulic supports to form a closed space behind them, during the upward mining process, metal mesh and filling cloth laid above the top beam of the support are extended to the coal wall of the goaf behind the support and fixed thereafter. Then, by modifying the end support and adding side guard plates, the baffles are pushed against the roadway side to form a closed space to prevent grout leakage. Then, the goaf is filled with high-concentration cemented filling grout.

[0016] Preferably, the high-concentration filling slurry, under the influence of gravity, first flows into the empty area generated during the support advancement process. As the slurry level rises, it flows into the triangular area generated in the previous cycle to complete the connection.

[0017] Preferably, the filling branch pipeline and the discharge pipe of the goaf are detachably connected to each other via flanges.

[0018] Preferably, the metal mesh joints are secured with wire, and the filling fabric joints are connected with an explosion-proof sewing machine. The support advances forward, and the metal mesh and filling fabric extend to the rear of the goaf, enabling continuous operation.

[0019] Preferably, valves are installed at the branch points and ends of the pipeline, and tees are installed at both ends to control the slurry delivery and drainage of the cleaning pipeline.

[0020] As can be seen from the technical solutions provided by the embodiments of the present invention above, the present invention provides a backfilling mining method using non-backfilling supports during overhead mining. Since non-backfilling hydraulic supports are difficult to form a sealed space behind the supports, during overhead mining, a metal mesh and backfilling cloth are laid above the top beam of the support and extended to the coal wall of the goaf behind the support for fixation. The end supports are then modified, and side guard plates are added to push the baffles against the roadway side to form a sealed space to prevent slurry leakage. Then, the goaf is filled with high-concentration cemented backfilling slurry. The metal mesh and backfilling cloth are laid on the coal wall on the mining side. The metal mesh joints are fixed with wire, and the backfilling cloth joints are connected with an explosion-proof sewing machine, ultimately completing the backfilling mining of the entire goaf. This relatively reduces the coal mine's input costs, increases the coal mine's economic benefits, and resolves the contradiction between backfilling and equipment. It provides a new approach for backfilling mining using non-backfilling supports with high-concentration cemented backfilling materials.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This invention provides an operation flowchart of a backfilling mining method using non-backfilling supports during overhead mining;

[0024] Figure 2 A cross-sectional schematic diagram of the working face of a backfilling mining method using a non-backfilling support during the upward mining process provided by the present invention;

[0025] Figure 3 A plan view of the working face of a backfilling mining method using a non-backfilling support during the overhead mining process provided by the present invention;

[0026] In the diagram: 1. Filling fabric 2. Metal mesh 3. Coal wall of the mining sidewall 4. Roof beam 5. Goaf 6. Scraper conveyor 7. Sidewall 8. Triangular goaf roof area 9. Hydraulic support 10. Coal wall behind the support 11. Coal mining face 12. Track transport roadway 13. Belt conveyor roadway 14. Baffle 15. Three-way valve 16. Hoses 17. Conveying pipe 18. Main filling pipe Detailed Implementation

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0028] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or couplings. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0029] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0030] To facilitate understanding of the embodiments of the present invention, the following will provide further explanation and description with reference to the accompanying drawings and several specific embodiments. These embodiments do not constitute a limitation on the embodiments of the present invention.

[0031] See Figures 1 to 3 The present invention provides a backfilling mining method using a non-backfilling support during overhead mining, comprising the following steps:

[0032] S1 first makes an opening, and then fixes the metal mesh 2 and filling cloth 1 behind it. The cloth extends from the support 9 to the top beam 4 of the support and is compacted on the side coal wall 3 with the side protection plate 7. As the coal face 11 continues to advance, the filling pipe is laid from the bottom chamber through the auxiliary haulage roadway, along the track transport roadway 12 to the coal face 11. Then, a flexible hose 16 is laid behind the baffle of the scraper conveyor 6 along the working face. After exiting the working face, the pipe is laid along the belt transport roadway 13 until it reaches the water discharge roadway of the working face. At both ends, the material distribution pipe 17 is set to fill the goaf 5.

[0033] During the upward mining process, S2 is secured by a metal mesh 2 and a filling cloth 1 laid above the top beam 4 of the support, extending to the coal wall 10 in the goaf behind the support. The end support is then modified, and side guard plates are added to push the baffle 14 against the roadway wall, creating a sealed space to prevent grout leakage. Then, the goaf 5 is filled with high-concentration cemented filling grout.

[0034] The S3 metal mesh 2 and filling fabric 1 are laid on the side of the coal wall 3 of the mining side. The joints of the metal mesh 2 are fixed with wire, and the joints of the filling fabric 1 are connected with an explosion-proof sewing machine. The support is advanced forward, and the metal mesh 2 and filling fabric 1 extend to the rear of the goaf.

[0035] During the S4 filling process, the high-concentration filling slurry is first flowed into the void generated during the hydraulic support 9's advancement process due to gravity. As the filling slurry level rises, it flows into the triangular zone 8 generated in the previous cycle to complete the top connection.

[0036] The S5 pusher scraper conveyor 6 moves the hydraulic support 9, and the working face hose 16 is pushed forward together, while the filling branch pipe is disassembled to enter the next cycle.

[0037] S6 Repeat steps S3, S4 and S5 until the filling operation of goaf 5 is completed.

[0038] Figure 2 and 3 An exemplary working environment is shown for a backfilling mining method using non-backfilling supports during overhead mining. Figure 2 This is a cross-sectional view of the working environment. The metal mesh 2 and filling cloth 1 are laid on the side of the coal wall 3 of the mining side. The joints of the metal mesh 2 are fixed with wire, and the joints of the filling cloth 1 are connected with an explosion-proof sewing machine. The support moves forward, and the metal mesh 2 and filling cloth 1 extend to the rear of the goaf. During the filling process, the high-concentration filling slurry, under the influence of gravity, first flows into the goaf created during the advancement of the hydraulic support 9. As the level of the filling slurry rises, it flows into the triangular area 8 created in the previous cycle to complete the roof connection. The pusher scraper conveyor 6 moves the hydraulic support 9, and the working face hose 16 moves forward together. After advancing an appropriate distance, a section of the pipeline is disassembled to enter the next cycle. Figure 3 This is a top-down view of the working environment. The central area is the coal mining area, with the working face at its end. To the left of the working area is the track transport roadway 12, to the right is the belt conveyor roadway 13, behind is the goaf 10, and in front is the coal wall 3. The filling pipeline is laid along the track transport roadway 12 to the working face. Then, a flexible hose 16 is laid along the working face 11 behind the baffle of the scraper conveyor 6. After exiting the working face, the pipeline is laid along the belt conveyor roadway 13 until it reaches the working face drainage roadway. A material distribution pipe 17 is installed at both ends to fill the goaf 10. Valves are installed at the pipeline branching points and the pipeline ends, and three-way valves 15 are installed at both ends to control the slurry delivery and drainage of the cleaning pipeline.

[0039] In the embodiments provided by this invention, the filling operation of the goaf 5 involves conveying filling slurry to the goaf 5. The filling slurry consists of coal gangue and fly ash, as well as cementing materials (generally cement), additives, and water. The composition ratio of the slurry is determined based on the production of coal-based solid waste in the mining area. Depending on the application scenario, appropriate amounts of additives and water are added to the raw materials to prepare a high-concentration cemented slurry with certain fluidity and low bleeding. The hydraulic support used is a conventional fully mechanized mining hydraulic support.

[0040] During the upward mining process, the metal mesh 2 and filling cloth 1, laid above the support beam 4, extend to the coal wall 10 in the goaf behind the support and are then fixed. The end support is modified, and side guard plates are added to push the baffle 14 against the roadway side, forming a sealed space to prevent grout leakage. Then, the goaf 5 is filled with high-concentration cemented filling grout. The metal mesh 2 and filling cloth 1 are laid on the side coal wall of the mining section. The joints of the metal mesh 2 are fixed with wire, and the joints of the filling cloth 1 are connected with an explosion-proof sewing machine. The support 9 advances forward, and the metal mesh 2 and filling cloth 1 extend to the rear of the goaf 5.

[0041] The present invention also provides an embodiment for exemplarily illustrating the specific process of the method provided by the present invention:

[0042] Step 1.1: Determine the empty area of ​​the top triangular region based on the filling step distance.

[0043] Step 1.2: The filling height must not exceed the height of the baffle to prevent grout leakage.

[0044] Step 1.3: Design a precise slurry preparation scheme, a pipeline transportation scheme, and a full-process control scheme for filling equipment, and complete the design of a filling mining scheme for non-filling supports.

[0045] Step 2.1: Configure a slurry filling system on the ground, and connect the discharge end of the slurry filling system to the downhole trunk filling pipe 18.

[0046] Step 2.2: The main filling pipe 18 is laid along the track transport roadway 12 to the working face. Then, a flexible hose 16 is laid behind the baffle of the scraper conveyor 6 along the working face 11. After exiting the working face, the pipeline is laid along the belt conveyor roadway 13 until it reaches the working face drainage roadway. A material distribution pipe 17 is installed at both ends to fill the goaf 10. Valves are installed at the pipeline bifurcation and pipeline termination points, and three-way valves 15 are installed at both ends to control the slurry transportation and drainage of the cleaning pipeline.

[0047] Step 3.1: During the upward mining process, the metal mesh 2 and filling cloth 1, laid above the support top beam 4, are extended to the coal wall 10 in the goaf behind the support and fixed. Then, the end support is modified, and side guard plates are added to push the baffle 14 against the roadway side to form a sealed space to prevent grout leakage. Then, the goaf 5 is filled with high-concentration cemented filling grout.

[0048] Step 3.2: The metal mesh 2 and filling fabric 1 are laid on the side of the coal wall 3 of the mining area. The joints of the metal mesh 2 are fixed with wire, and the joints of the filling fabric 1 are connected with an explosion-proof sewing machine. The support is advanced forward, and the metal mesh 2 and filling fabric 1 extend to the rear of the goaf.

[0049] Step 3.3: During the filling process, the high-concentration filling slurry first flows into the void created by the hydraulic support 9 during its advancement due to gravity. As the level of the filling slurry rises, it flows into the triangular zone 8 created in the previous cycle to complete the connection.

[0050] Step 3.4: Push the scraper conveyor 6 and move the hydraulic support 9 and the working face hose 16 forward together. After advancing an appropriate distance, disassemble a section of the pipeline at the same time to enter the next cycle.

[0051] Step 3.5: Repeat the above steps until the filling operation of goaf 5 is completed.

[0052] In summary, this invention provides a backfilling mining method using non-backfilling supports during overhead mining. Since non-backfilling hydraulic supports struggle to create a sealed space behind them, during overhead mining, a metal mesh and backfilling fabric are laid above the support's top beam and extended to the coal wall in the goaf behind the support, then fixed. The end supports are modified, and side guards are added to create a sealed space against the roadway wall to prevent slurry leakage. Then, the goaf is filled with high-concentration cemented backfilling slurry. The metal mesh and backfilling fabric are laid on the coal wall on the mining side, with the metal mesh joints secured with wire and the backfilling fabric joints connected with an explosion-proof sewing machine. This method ultimately completes the backfilling mining of the entire goaf, relatively reducing coal mine input costs, increasing economic benefits, and resolving the conflict between backfilling and equipment. It provides a new approach for backfilling mining using non-backfilling supports with high-concentration cemented backfilling slurry.

[0053] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of one embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing the present invention.

[0054] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of the present invention.

[0055] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for apparatus or system embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The apparatus and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0056] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method of stope mining using non-supporting pillars in a top slicing process, characterized in that, include: S1 first opens the hole, and the filling pipe is laid from the bottom chamber through the auxiliary haulage roadway to the working face along the track transport roadway. Then, a flexible hose is laid behind the scraper conveyor baffle along the working face. After exiting the working face, the pipeline is laid along the belt conveyor roadway until the working face water release roadway. During the continuous advancement of the coal mining face, material distribution pipes are set at both ends to fill the goaf. During the upward mining process, S2 is secured to the coal face in the goaf behind the support by a metal mesh and filling fabric laid on the top beam of the support. The end support is then modified, and side guards are added to create a sealed space against the roadway wall to prevent grout leakage. The goaf is then filled with high-concentration cemented filling grout. The S3 metal mesh and filling fabric are laid on the side of the coal face during mining. The joints of the metal mesh are fixed with wire, and the joints of the filling fabric are connected with an explosion-proof sewing machine. The support is advanced forward, and the metal mesh and filling fabric extend to the rear of the goaf. During the S4 filling process, the high-concentration filling slurry is first drawn into the void created during the support advancement process due to gravity. As the slurry level rises, it flows into the triangular area created in the previous cycle to complete the connection. The S5 pusher scraper conveyor moves the hydraulic support, and the working face hose is pushed forward together. After pushing forward an appropriate distance, a section of the pipeline is disassembled at the same time to enter the next cycle. S6 Repeat steps S3, S4 and S5 until the goaf filling operation is completed. The filling operation of the goaf involves conveying filling slurry into the goaf. The filling slurry consists of coal gangue and fly ash, as well as cementing materials (usually cement), additives, and water. The hydraulic supports used are ordinary fully mechanized hydraulic supports.

2. The non-pillared, pillarless mining method according to claim 1, characterized in that, The discharge pipe of the goaf has two discharge ports spaced apart, located at two ends respectively.

3. The filling mining method for non-filling supports according to claim 1, characterized in that, Non-filled hydraulic supports are difficult to form a sealed space behind the support. During overhead mining, metal mesh and filling cloth are laid on the top beam of the support and extended to the coal wall of the goaf behind the support for fixation. The end supports are modified and side guards are added to push the baffles against the roadway side to form a sealed space to prevent grout leakage. Then, the goaf is filled with high-concentration cemented filling grout.

4. The filling mining method for non-filling supports according to claim 1, characterized in that, High-concentration filling slurry, under the influence of gravity, first flows into the void created during the support advancement process. As the slurry level rises, it flows into the triangular area created in the previous cycle to complete the connection.

5. The filling mining method for non-filling supports according to claim 1, characterized in that, The filling branch pipeline and the discharge pipe of the goaf are detachably connected to each other via flanges.

6. The filling mining method for non-filling supports according to claim 1, characterized in that, The metal mesh joints are secured with wire, while the filling fabric joints are connected with explosion-proof sewing machines. The support frame moves forward, and the metal mesh and filling fabric extend to the rear of the goaf, enabling continuous operation.

7. The filling mining method for non-filling supports according to claim 1, characterized in that, Valves are installed at the branch points and ends of the pipeline, and tees are installed at both ends. The valves are used to control the slurry delivery and drainage of the cleaning pipeline.

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