A single-lane isolated double-channel arrangement method for steeply inclined coal seams

Abstract

This invention discloses a method for arranging a single-roadway with dual channels for steeply inclined coal seams, comprising the following steps: excavating a single main roadway along the bottom plate of the steeply inclined coal seam to the boundary of the mining area, ensuring a suitable dip angle and meeting the needs of transportation, pedestrians, and ventilation; installing an isolation windbreak wall in the middle of the main roadway to separate the two channels; arranging conveyors, pedestrian walkways, and pipelines in the transportation and pedestrian channels, and installing a negative pressure ventilation system in the return air channel and connecting it to the return air end of the working face; after the working face retreats and advances a preset distance, moving the isolation windbreak wall forward and sealing the gap with fireproof mud to ensure the independence of the channels. Through this invention, a low-cost and high-efficiency dynamic isolation method for single-roadways is provided, effectively separating the ventilation area and transportation area within a single roadway, ensuring ventilation safety, and not affecting the normal operation of transportation. Simultaneously, it reduces excavation costs, shortens the construction period, and meets the needs of efficient, safe, and economical mining of steeply inclined coal seams.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and in particular to a method for arranging a single-roadway isolation dual-channel system for steeply inclined coal seams. Background Technology

[0002] In steeply inclined coal seam mining, ventilation safety and transportation efficiency are core prerequisites for ensuring the smooth operation of mining operations and have long been technical challenges in the industry. Traditional mining processes typically require the excavation of a dual-roadway structure to effectively separate ventilation and transportation functions. This involves excavating separate haulage and return airways. The haulage roadway is primarily used for transporting coal, equipment, and personnel, while the return airway is responsible for expelling harmful gases such as methane and dust generated during mining, preventing their accumulation and potential safety accidents. However, the dual-roadway excavation model has significant drawbacks. On the one hand, it requires substantial investment of manpower, materials, and financial resources, increasing construction costs and extending the overall construction period, leading to reduced mining efficiency and hindering the efficient development of steeply inclined coal seams. On the other hand, dual-roadway excavation can damage the surrounding rock structure, increasing the risk of roadway collapse and spalling, further raising safety risks and maintenance costs.

[0003] Based on the current state of the industry, there is an urgent need for a low-cost, high-efficiency single-roadway dynamic isolation method in the field of steeply inclined coal seam mining. Through reasonable isolation structure design, the ventilation area and transportation area in a single roadway can be effectively separated, which can not only avoid airflow short-circuiting and gas accumulation and ensure ventilation safety, but also not affect the normal operation of transportation. At the same time, it can reduce tunneling costs and shorten the construction period, thus meeting the needs of efficient, safe and economical mining of steeply inclined coal seams. Summary of the Invention

[0004] The purpose of this invention is to address the deficiencies in the existing technology and to propose a single-lane isolation dual-channel layout method for steeply inclined coal seams.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A method for arranging a single roadway with two isolated passages for steeply inclined coal seams includes the following steps: S1 roadway excavation: Excavate a single main roadway along the bottom of the steeply inclined coal seam as the base roadway for the section's transport level roadway. Excavate the main roadway to the boundary of the mining area to ensure that the main roadway is adapted to the dip angle characteristics of the steeply inclined coal seam and meets the subsequent transportation, pedestrian and ventilation needs. S2 Channel Isolation: An isolation windbreak wall is installed in the middle of the main roadway after excavation to divide the main roadway into two independent channels, namely the transport and pedestrian channel and the return air channel. The transport and pedestrian channel is connected to the section transport system, and the return air channel is connected to the section return air level. S3 Facility Layout: Conveyors, pedestrian walkways, and pipelines are arranged in the transportation and pedestrian passageway, and a negative pressure ventilation system is installed in the return air passageway so that the return air passageway is directly connected to the return air end of the coal mining face. S4 Dynamic Adjustment: When the coal mining face advances backward a preset distance, the preset length of movable isolation windbreak wall is removed, and fireproof mud is used to dynamically fill the gap between the isolation windbreak wall and the roadway roof to ensure a tight seal and prevent air leakage, thus maintaining the independent function of the two channels at all times.

[0006] Furthermore, the main roadway excavation slope described in step S1 is consistent with the dip angle of the steeply inclined coal seam, and anti-collapse support measures are taken during the excavation process to ensure the stability of the roadway.

[0007] Furthermore, the movable windbreak wall mentioned in step S2 includes bamboo damper panels and precast concrete slabs. The precast concrete slabs are detachably installed at the bottom of the tunnel, and the bamboo damper panels are detachably installed on the precast concrete slabs.

[0008] Furthermore, the ventilation intensity of the negative pressure ventilation system described in step S3 is adapted to the gas outburst of the steeply inclined coal seam, ensuring that the polluted air in the goaf can be discharged in a timely manner and preventing gas accumulation.

[0009] Furthermore, in step S4, the preset advance distance is 10m, and the gap between the forward-moving isolation windbreak wall and the roof of the main tunnel is sealed with fireproof mud.

[0010] Furthermore, the pedestrian passage described in step S3 is equipped with an anti-slip structure to adapt to the slope of the roadway in the steeply inclined coal seam and ensure the safety of workers during passage.

[0011] Beneficial effects

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a low-cost and high-efficiency dynamic isolation method for single roadways. Through a reasonable isolation structure design, the ventilation area and transportation area within a single roadway can be effectively separated. This can avoid airflow short-circuiting and gas accumulation, ensuring ventilation safety, while not affecting the normal operation of transportation. At the same time, it reduces tunneling costs and shortens the construction period, meeting the needs of efficient, safe and economical mining of steeply inclined coal seams. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0014] Figure 1 This is a schematic diagram of the tunnel structure. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0016] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0017] Reference Figure 1 A single-lane isolation dual-channel layout method for steeply inclined coal seams aims to solve the technical problems of high cost and long construction period of dual-lane excavation in traditional steeply inclined coal seam mining, as well as the inability of existing single-lane layout technology to effectively separate ventilation and transportation functions, which easily leads to airflow short-circuiting and gas accumulation. This method achieves low-cost, high-efficiency, and safe mining of steeply inclined coal seams, and specifically includes the following steps: S1 roadway excavation: A single main roadway is excavated along the bottom plate of the steeply inclined coal seam, serving as the foundation roadway for the section's transport level roadway. During the excavation process, the excavation slope of the main roadway is strictly controlled to ensure that it is consistent with the dip angle of the steeply inclined coal seam. This ensures that the main roadway can adapt to the dip angle characteristics of the steeply inclined coal seam and avoids problems such as obstruction of transport equipment operation and inconvenience to personnel passage caused by slope mismatch.

[0018] Meanwhile, the cross-sectional dimensions of the main roadway need to be designed in conjunction with subsequent transportation, pedestrian, and ventilation requirements to ensure that conveyors, pedestrian passages, and various pipelines can be reasonably arranged and meet ventilation volume requirements. After the main roadway is excavated to the boundary of the mining area, the roadway cross-section is trimmed, and loose debris and other contaminants on the inner wall of the roadway are removed to ensure that the inner wall of the roadway is flat, laying the foundation for the subsequent installation of isolation windbreaks and facility layout.

[0019] In addition, anti-collapse support measures must be taken during the tunneling process. The combination of anchor bolts and anchor cables can be used to reinforce the roof and sidewalls of the tunnel, effectively resist rock pressure, ensure the long-term stability of the tunnel, and avoid the impact of tunnel collapse on the safety of mining operations.

[0020] S2 Channel Isolation: In the middle of the main roadway after excavation and repair, a movable isolation windbreak wall is installed to divide the main roadway into two independent and non-interfering channels, namely the transportation and pedestrian channel and the return air channel.

[0021] The transport and pedestrian passage is located on the side closest to the coal seam mining face and is connected to the section transport system. It is used for transporting coal and mining equipment as well as for the passage of workers. The return air passage is located on the side furthest from the mining face and is connected to the section return air level. It is specifically used to discharge harmful gases such as methane and dust, as well as polluted air generated during the mining process.

[0022] The movable windbreak wall consists of bamboo damper panels and precast concrete slabs. The precast concrete slabs are detachably installed at the bottom of the tunnel to serve as the supporting foundation for the windbreak wall, thereby improving its stability. The bamboo damper panels are detachably installed on the precast concrete slabs. The bamboo damper panels are lightweight, flame-retardant, and corrosion-resistant, which can effectively isolate the passage and facilitate subsequent disassembly and relocation to meet dynamic adjustment needs. At the same time, the low cost of bamboo materials can further reduce mining costs.

[0023] S3 Facility Layout: Conveyors, pedestrian walkways, and various pipelines are rationally arranged within the transport and pedestrian walkway. Anti-slip conveyors adapted to the steep slope of the coal seam are selected to ensure that slippage and accumulation do not occur during coal transport. Pedestrian walkways are located on one side of the conveyors, and their surfaces are equipped with anti-slip structures such as anti-slip patterns and strips to adapt to the steep slope of the coal seam roadway, effectively preventing workers from slipping and ensuring their safety. Various pipelines (including power supply lines and water supply lines) are arranged orderly along the side walls of the transport and pedestrian walkway to avoid occupying transport and passage space. Pipelines are also securely fixed to prevent them from falling off or being damaged.

[0024] A negative pressure ventilation system is installed in the return air duct. The ventilation intensity of the negative pressure ventilation system is designed to be adapted to the gas emission of the steeply inclined coal seam, so as to ensure that the ventilation intensity can meet the timely discharge needs of the goaf and the working face, so that the return air duct is always kept in a negative pressure state, to prevent gas accumulation, airflow short circuit and other problems, and to ensure ventilation safety.

[0025] S4 Dynamic Adjustment: Since steeply inclined coal seam mining adopts a backward advance method, after the coal mining face has advanced a preset distance (the preset advance distance in this embodiment is 10m), the movable isolation windbreak wall needs to be dynamically adjusted to always maintain the independent function of the two channels and adapt to the advance requirements of the working face.

[0026] During the adjustment, first remove the fixed connection between the precast concrete slab and the bottom of the roadway, then remove the connection between the bamboo ventilation door panel and the precast concrete slab, and move the movable isolation windbreak wall forward to the corresponding new position. During the forward movement, it is necessary to ensure that the installation position of the isolation windbreak wall matches the cross-section of the roadway after the working face is advanced, so as to avoid installation deviation.

[0027] After the forward movement is completed, fireproof sealant is used to dynamically fill the gap between the isolation windbreak wall and the roadway roof. The fireproof sealant has good sealing performance and can effectively fill the gap to achieve a seal and prevent air leakage. This prevents airflow from flowing between the transport and pedestrian passage and the return air passage, ensuring that the two passages always remain independent and continue to perform their respective functions of transport, pedestrian and return air, thus ensuring the continuity and safety of mining operations.

[0028] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for arranging a single roadway with two isolated passages in a steeply inclined coal seam, characterized in that, Includes the following steps: S1 roadway excavation: Excavate a single main roadway along the bottom of the steeply inclined coal seam as the base roadway for the section's transport level roadway. Excavate the main roadway to the boundary of the mining area to ensure that the main roadway is adapted to the dip angle characteristics of the steeply inclined coal seam and meets the subsequent transportation, pedestrian and ventilation needs. S2 Channel Isolation: An isolation windbreak wall is installed in the middle of the main roadway after excavation to divide the main roadway into two independent channels, namely the transport and pedestrian channel and the return air channel. The transport and pedestrian channel is connected to the section transport system, and the return air channel is connected to the section return air level. S3 Facility Layout: Conveyors, pedestrian walkways, and pipelines are arranged in the transportation and pedestrian passageway, and a negative pressure ventilation system is installed in the return air passageway so that the return air passageway is directly connected to the return air end of the coal mining face. S4 Dynamic Adjustment: When the coal mining face advances backward a preset distance, the preset length of movable isolation windbreak wall is removed, and fireproof mud is used to dynamically fill the gap between the isolation windbreak wall and the roadway roof to ensure a tight seal and prevent air leakage, thus maintaining the independent function of the two channels at all times.

2. The method for arranging a single roadway with two isolated passages for steeply inclined coal seams according to claim 1, characterized in that, In step S1, the excavation slope of the main roadway is consistent with the dip angle of the steeply inclined coal seam. During the excavation process, anti-collapse support measures are taken to ensure the stability of the roadway.

3. The method for arranging a single roadway with two isolated channels for steeply inclined coal seams according to claim 1, characterized in that, The movable windbreak wall mentioned in step S2 includes bamboo damper panels and precast concrete slabs. The precast concrete slabs are detachably installed at the bottom of the tunnel, and the bamboo damper panels are detachably installed on the precast concrete slabs.

4. The method for arranging a single roadway with two isolated passages for steeply inclined coal seams according to claim 1, characterized in that, The ventilation intensity of the negative pressure ventilation system described in step S3 is adapted to the gas outburst of the steeply inclined coal seam, ensuring that the polluted air in the goaf can be discharged in a timely manner and preventing gas accumulation.

5. A method for arranging a single roadway with two isolated passages for steeply inclined coal seams according to claim 1, characterized in that, In step S4, the preset advance distance is 10m, and the gap between the forward-moving isolation windbreak wall and the roof of the main tunnel is sealed with fireproof mud.

6. A method for arranging a single roadway with two isolated passages for steeply inclined coal seams according to claim 1, characterized in that, The pedestrian passage described in step S3 is equipped with an anti-slip structure to adapt to the slope of the roadway in the steeply inclined coal seam and ensure the safety of workers.

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