Filling mining method for coal mine stope face roof anchor rod temporary support

Abstract

According to the coal mine stope face roof anchor rod temporary support filling mining method, due to the fact that a closed space is difficult to form behind the non-filling hydraulic support, in the upward mining process, the highest layer of filling slurry does not exceed a support base, under the condition, high-concentration cemented filling slurry is filled into a goaf, and the high-concentration cemented filling slurry is filled into the goaf; after a filling step pitch, anchor rod temporary support is carried out on a top plate of the empty roof area in time, the triangular empty roof area of the previous filling cycle is filled in the filling process, and finally filling mining of the whole goaf is completed, so that the input cost of a coal mine is relatively reduced, and the economic benefit of the coal mine is increased; and the contradiction between filling mining and corollary equipment is solved. And a new thought is provided for the filling mining method for temporarily supporting the high-concentration cemented filling slurry by using the top plate anchor rod.

Description

Technical Field

[0001] This invention relates to the field of coal mine backfilling technology, and in particular to a backfilling mining method for temporary support of roof anchor bolts in coal mine longwall faces.

[0002] Backfilling mining is an effective method to prevent surface subsidence at its source, obtain coal resources with minimal ecological disturbance, and limit the impact on the ecological environment, water and soil resources, and infrastructure to a controllable range, thus promoting the coordinated and harmonious development of coal mining and the ecological environment. Currently, for the protective coal pillars left over from early "three-under" mining (underground mining, underground mining, and underground mining), if no measures are taken to completely mine the underlying coal, it will inevitably cause serious damage to surface buildings after mining, based on the laws of surface movement and deformation. For conventional backfilling processes, using this technology for some corner coal pillars and small-scale "three-under" mining requires purchasing a large number of backfilling supports, which inevitably increases the mining cost for the mine. Considering the current state of the working face and existing technology and equipment, how to conduct efficient and safe backfilling mining operations without backfilling supports has become a problem to be solved.

[0003] This technology addresses the challenge of parallel mining in backfilling operations, significantly improving efficiency and reducing equipment downtime and wasted manpower. For non-backfilling supports lacking a rear roof beam, resulting in excessive roof control distance, roof shearing, and large-scale collapse, temporary anchor bolt support is proposed. This will help control the roof and ensure the safety and feasibility of backfilling operations. Summary of the Invention

[0004] The embodiments of the present invention provide a backfilling mining method for temporary support of roof anchor bolts in coal mine longwall faces, which is used to solve 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 for temporary roof anchor bolt support in a coal mine longwall face includes:

[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 of S2, the highest layer of the backfill slurry must not exceed the base of the support. Under this condition, the goaf is filled with high-concentration cemented backfill slurry.

[0009] After S3 completes one filling step, the roof of the empty roof area should be temporarily supported by anchor bolts in a timely manner. During the filling process, the triangular empty roof area of ​​the previous filling cycle should be filled.

[0010] The S4 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.

[0011] S5 Repeat steps S3 and S4 until the goaf filling operation is completed.

[0012] 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.

[0013] Preferably, the discharge pipe in the goaf has two discharge ports spaced apart, located at two different ends.

[0014] Preferably, during the upward mining process, the highest layer of the backfill slurry should not exceed the base of the support, and under this condition, the goaf is filled with high-concentration cemented backfill slurry.

[0015] Preferably, after one filling step, the roof of the empty roof area should be temporarily supported by anchor bolts in a timely manner, and the triangular empty roof area of ​​the previous filling cycle should be filled during the filling process.

[0016] Preferably, the filling branch pipeline and the discharge pipe of the goaf are detachably connected to each other via flanges.

[0017] 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.

[0018] As can be seen from the technical solutions provided by the embodiments of the present invention, the filling mining method for temporary roof anchor bolt support in coal mine longwall faces provided by the present invention addresses the challenge of creating a closed space behind non-filling hydraulic supports during overhead mining. Since the highest layer of filling slurry must not exceed the support base during this process, the goaf is filled with high-concentration cemented filling slurry. After one filling step, temporary anchor bolt support is promptly applied to the roof of the goaf. During the filling process, the triangular goaf area from the previous filling cycle is also filled, ultimately completing the filling mining of the entire goaf. This relatively reduces the coal mine's input costs, increases its economic benefits, and resolves the conflict between filling and equipment. It provides a new approach to filling mining methods using high-concentration cemented filling slurry with temporary roof anchor bolt support.

[0019] 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

[0020] 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.

[0021] Figure 1 This invention provides an operation flowchart of a filling mining method for temporary support of roof anchor bolts in a coal mine longwall face;

[0022] Figure 2 A cross-sectional schematic diagram of the working face of a filling mining method for temporary support of roof anchor bolts in a coal mine longwall face, provided by the present invention.

[0023] Figure 3 A plan view of the working face of a backfilling mining method for temporary support of roof anchor bolts in a coal mine longwall face, as provided by the present invention.

[0024] In the diagram: 1. Coal wall of the mining sidewall; 2. Roof beam; 3. Goaf; 4. Scraper conveyor; 5. Sidewall; 6. Triangular roof area; 7. Hydraulic support; 8. Coal wall behind the support; 9. Coal face; 10. Track transport roadway; 11. Belt conveyor roadway; 12. Three-way valve; 13. Hoose; 14. Conveying pipe; 15. Main filling pipe; 16. Support base; 17. Anchor bolt. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] See Figures 1 to 3 The present invention provides a backfilling mining method for temporary support of roof anchor bolts in coal mine longwall faces, comprising the following processes:

[0030] S1 first opens the cut. As the coal face 9 continues to advance, the filling pipe is laid from the bottom chamber through the auxiliary haulage roadway, along the track transport roadway 10 to the coal face 9. Then, a flexible hose 13 is laid behind the baffle of the scraper conveyor 4 along the working face 9. After exiting the working face 9, the pipe is laid along the belt conveyor roadway 11 until it reaches the water discharge roadway of the working face. At both ends, a material distribution pipe 14 is set to fill the goaf.

[0031] During the upward mining process of S2, the highest layer of the backfill slurry must not exceed the support base 16. Under this condition, the goaf 3 is filled with high-concentration cemented backfill slurry.

[0032] After S3 completes one filling step, the roof of the empty roof area should be temporarily supported by anchor bolts 17 in a timely manner. During the filling process, the triangular empty roof area 6 of the previous filling cycle should be filled.

[0033] The S4 pusher scraper conveyor moves the hydraulic support 7 and the working face hose 13 forward together. After advancing an appropriate distance, a section of the pipeline is disassembled at the same time to enter the next cycle.

[0034] S5 Repeat steps S3 and S4 until the goaf filling operation is completed.

[0035] Figure 2 and 3 The example illustrates the working environment of a backfilling mining method for temporary support of the roof anchor bolt 17 in a coal mine longwall face. Figure 2 The diagram shows a cross-section of the working environment. The highest layer of the backfill slurry must not exceed the support base 16. Under this condition, the goaf area is filled with high-concentration cemented backfill slurry. After one filling step, the roof of the goaf area should be temporarily supported by anchor bolts 17 in a timely manner. During the filling process, the triangular goaf area 6 of the previous filling cycle is filled. The pusher and scraper conveyor moves the hydraulic support, and the working face hose 13 is pushed forward together. After advancing an appropriate distance, a section of the pipeline is disassembled at the same time 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 9 at its end. To the left of the working face is the track transport roadway 10, and to the right is the belt conveyor roadway 11. Behind it is the goaf 10, and in front is the coal wall 1 of the mining side. The filling pipeline is laid along the track transport roadway 10 to the working face. Then, a flexible hose 13 is laid along the working face 9 behind the baffle of the scraper conveyor 4. After exiting the working face, the pipeline is laid along the belt conveyor roadway 11 until it reaches the working face drainage roadway. A material distribution pipe 14 is installed at both ends to fill the goaf 3. Valves are installed at the pipeline branching points and the pipeline ends, and three-way valves 12 are installed at both ends to control the slurry delivery and drainage of the cleaning pipeline.

[0036] In the embodiments provided by this invention, the filling operation of the goaf 3 involves conveying filling slurry to the goaf 3. 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.

[0037] During the upward mining process, the highest layer of backfill slurry must not exceed the support base 16. Under this condition, the goaf is filled with high-concentration cemented backfill slurry. After one filling step, the roof of the goaf 6 should be temporarily supported by anchor bolts 17 in a timely manner. During the filling process, the triangular goaf 6 of the previous filling cycle is filled. The pusher and scraper conveyor 4 moves the hydraulic support 7, and the working face hose 13 is pushed forward together. After advancing an appropriate distance, a section of the pipeline is disassembled at the same time to enter the next cycle.

[0038] The present invention also provides an embodiment for exemplarily illustrating the specific process of the method provided by the present invention:

[0039] Step 1.1: Determine the empty area of ​​the top triangular region based on the filling step distance.

[0040] Step 1.2: The highest filling layer must not exceed the support base 16 to prevent grout leakage.

[0041] Step 1.3: Design a precise slurry preparation plan, a pipeline transportation plan, and a full-process control plan for filling equipment, and complete the design of the filling mining method plan for temporary support of roof anchor bolts.

[0042] 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 15.

[0043] Step 2.2: The main filling pipe 15 is laid along the track transport roadway 10 to the working face. Then, a flexible hose 13 is laid behind the baffle of the scraper conveyor 4 along the working face 9. After exiting the working face, the pipeline is laid along the belt conveyor roadway 11 until it reaches the working face drainage roadway. A material distribution pipe 14 is installed at both ends to fill the goaf 3. Valves are installed at the pipeline bifurcation and pipeline termination points, and three-way valves 12 are installed at both ends to control the slurry transportation and drainage of the cleaning pipeline.

[0044] Step 3.1: After one filling step, the roof of the empty roof area 6 should be temporarily supported by anchor bolts 17 in a timely manner. During the filling process, the triangular empty roof area 6 of the previous filling cycle should be filled.

[0045] Step 3.2: Push the hydraulic support 7 and working face hose 13 forward together on the scraper conveyor 4. After pushing them a suitable distance, disassemble one section of the pipeline at the same time to enter the next cycle.

[0046] Step 3.3: Repeat the above steps until the filling operation of goaf 3 is completed.

[0047] In summary, this invention provides a backfilling mining method for temporary roof anchor bolt support in coal mine longwall faces. Since non-backfilling hydraulic supports cannot form a sealed space behind them, during overhead mining, the highest layer of backfill slurry must not exceed the support base. Under this condition, the goaf is filled with high-concentration cemented backfill slurry. After one backfilling step, temporary anchor bolt support is promptly applied to the goaf roof. During the backfilling process, the triangular goaf area from the previous backfilling cycle is also backfilled. The pusher conveyor moves the hydraulic supports, and the working face hoses are advanced together. After advancing an appropriate distance, a section of the pipeline is simultaneously disassembled to enter the next cycle. This method ultimately completes the backfilling mining of the entire goaf, relatively reducing the coal mine's input costs, increasing its economic benefits, and resolving the conflict between backfilling and equipment. It provides a new approach to backfilling mining methods using high-concentration cemented backfill slurry with temporary roof anchor bolt support.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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 for backfilling mining of temporary roof anchor bolt support in a coal mine longwall face, 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 of S2, the highest layer of the backfill slurry must not exceed the base of the support. Under this condition, the goaf is filled with high-concentration cemented backfill slurry. After S3 completes one filling step, the roof of the empty roof area should be temporarily supported by anchor bolts in a timely manner. During the filling process, the triangular empty roof area of ​​the previous filling cycle should be filled. The S4 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. S5 Repeat steps S3 and S4 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 backfilling mining method for temporary roof anchor bolt support 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 backfilling mining method for temporary roof anchor bolt support according to claim 1, characterized in that, During the upward mining process, the highest layer of backfill slurry must not exceed the base of the support. Under this condition, the goaf is filled with high-concentration cemented backfill slurry.

4. The backfilling mining method for temporary roof anchor bolt support according to claim 1, characterized in that, After one filling step, the roof of the empty roof area should be temporarily supported by anchor bolts in a timely manner. During the filling process, the triangular empty roof area of ​​the previous filling cycle should be filled.

5. The backfilling mining method for temporary roof anchor bolt support 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 backfilling mining method for temporary roof anchor bolt support 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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