Layout method of coal mining continuous system based on backfill type deeply-buried channel

Abstract

The invention discloses a layout method of a coal mining continuous system based on a backfill type deeply-buried channel, and relates to the technical field of strip mine coal mining transportation systems. Firstly, raw coal transportation is conducted through an original rock section inclined roadway, and an inner dumping site is formed along with advancing of a working face; secondly, a backfill type deeply-buried channel is formed in the pit bottom, a belt conveyor is arranged in the backfill type deeply-buried channel to be communicated with a belt conveyor arranged in the inclined roadway, and raw coal under the pit is conveyed to a ground surface production system; the continuous mining and transportation process is combined with the backfill type deeply-buried channel, the coal mining transportation route is optimized, and the comprehensive cost is reduced; the backfill type deeply-buried channel is utilized, the inner drainage space is fully utilized, resource waste is reduced, and the utilization rate of the inner drainage space is increased; tail gas emission is reduced, and an efficient, low-consumption and environment-friendly transportation mode is achieved; manpower is released, and hidden safety accidents in truck transportation are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of open-pit coal mining and transportation system, in particular to a layout method of a continuous coal mining system based on a backfilling deep buried channel. BACKGROUND

[0002] Most open-pit coal mining and transportation systems use single-bucket-truck intermittent process, which has good flexibility, but also has problems of high energy consumption, serious pollution and high labor cost. The economic transport distance of truck transportation intermittent process is generally 3-4 km. With the increasing depth of open-pit coal mining, the truck return distance increases year by year. When the coal mining distance is more than 5 km, the economic rationality of single-bucket-truck intermittent process has no advantage. Truck transportation also affects the progress of releasing internal discharge space. Iterative upgrading of open-pit coal mining system by replacing intermittent process with continuous process is one of the fundamental ways to solve the above problems. SUMMARY

[0003] In view of the above problems, the present application provides a layout method of a continuous coal mining system based on a backfilling deep buried channel, which solves the problems of large transport distance, high energy consumption and serious pollution of the traditional single-bucket-truck transportation method. At the same time, the innovative method of laying belt conveyors in the backfilling deep buried channel solves the problems of frequent relocation of end-slope belt conveyors and impact on truck transportation, greatly improving the production efficiency.

[0004] The technical scheme adopted by the present application is as follows: a layout method of a continuous coal mining system based on a backfilling deep buried channel, the technical key points of which are as follows: first, using the original rock section inclined shaft for original coal transportation, and forming an internal discharge site as the working face advances; second, forming a backfilling deep buried channel at the pit bottom, and laying a belt conveyor in the backfilling deep buried channel and connecting it with the belt conveyor laid in the inclined shaft to transport the underground original coal to the ground production system.

[0005] Further, the original rock section inclined shaft is arranged along the working slope according to the position of the continuous mining equipment working face.

[0006] Further, a belt conveyor is laid in the original rock inclined shaft, and the belt conveyor is connected with the ground production system after leaving the inclined shaft.

[0007] Further, the formation process of the backfilling deep buried channel is as follows: the internal discharge operation is gradually advanced from one side to the other side of the pit bottom, and after completing a section, a backfilling deep buried channel corresponding to the section is installed, and immediately after the installation is completed, backfilling operation is performed above it, and the backfilling material comes from the stripping material of the internal discharge site; the backfilling process is layered and compacted, and the formation is gradually built up as the internal discharge advances.

[0008] Further, the backfilling deep buried channel has a filling height of not more than 300 m.

[0009] The beneficial effect of the present application is that the layout method of the coal mining continuous system based on the backfilling deep buried channel first uses the original rock section inclined roadway for original coal transportation, and as the working face advances, the internal dumping site is formed; secondly, the backfilling deep buried channel is formed at the pit bottom, and the belt conveyor in the backfilling deep buried channel is connected with the belt conveyor arranged in the inclined roadway to transport the underground original coal to the surface production system; the continuous mining and transportation process is combined with the backfilling deep buried channel to optimize the coal mining and transportation route and reduce the comprehensive cost; the backfilling deep buried channel is used to fully utilize the internal dumping space, reduce resource waste, and improve the internal dumping space utilization rate; tail gas emission is reduced to realize the high-efficiency, low-consumption and environmentally-friendly transportation mode; and manpower is released to reduce the hidden safety accidents in truck transportation. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0011] Figure 1 is a specific coal mining continuous system plane layout schematic diagram of the layout method of the open-pit mine coal mining continuous system based on the backfilling deep buried channel provided by the present application; Figure 2 is a specific backfilling deep buried channel formation process schematic diagram of the layout method of the open-pit mine coal mining continuous system based on the backfilling deep buried channel provided by the present application; Figure 3 is a specific belt conveyor schematic diagram of the layout method of the open-pit mine coal mining continuous system based on the backfilling deep buried channel provided by the present application; Figure 4 is a specific backfilling deep buried channel schematic diagram of the layout method of the open-pit mine coal mining continuous system based on the backfilling deep buried channel provided by the present application.

[0012] Figure 5 is a specific backfilling deep buried channel internal structure schematic diagram provided by the present application; Figure 6 is a specific connection schematic diagram of the three-dimensional steel bar net rack and the arc-shaped H-shaped steel framework in the embodiment of the present application; Figure 7 is a specific backfilling deep buried channel structure appearance schematic diagram in the embodiment of the present application; The serial number in the figure is explained as follows: 1 arc-shaped H-shaped steel framework; 2 three-dimensional steel bar net rack; 3 high-strength concrete layer; 4 internal dumping site; 5 end slope original rock transportation inclined roadway; 6 backfilling deep buried channel. DETAILED DESCRIPTION

[0013] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the following description is provided in conjunction with the accompanying drawings. Figures 1-7 The present invention will be further described in detail below with reference to specific embodiments.

[0014] When the overall coal transport distance in the lower part of the mining area increases to more than 5km, this embodiment adopts a layout combining continuous mining technology with belt conveyor transportation. In the initial stage of mining, the original rock transport inclined roadway 5 is used to transport raw coal. As the working face advances and the internal spoil heap 4 is formed, a backfilled deep-buried channel 6 is formed at the bottom of the pit. Belt conveyors are deployed in the backfilled deep-buried channel 6 and connected to the belt conveyors in the inclined roadway to transport the raw coal from the pit to the surface production system.

[0015] When the total coal transportation distance exceeds 5km, the original intermittent truck mining process is no longer suitable, and continuous coal mining technology should be adopted.

[0016] Based on factors such as the thickness, dip angle, hardness, gangue content, and geological conditions of the coal seam, select suitable continuous coal mining equipment.

[0017] After calculating and verifying factors and conditions such as the width of the mining zone, the mining height, and the minimum working level of the continuous mining process, the continuous mining equipment transfers the raw coal to the belt conveyor.

[0018] Based on factors such as the location of the continuous equipment working face, the layout of the internal spoil heap steps, the location of the ground production system interface, and the existing conditions of the above-ground structures, the optimal route layout scheme for the belt conveyor is determined.

[0019] In the initial stage of mining, based on the working face location of the continuous mining equipment, an inclined haulage roadway for transporting original rock is set up along the working face. Belt conveyors are installed in the inclined haulage roadway and connect with the surface production system after exiting the inclined haulage roadway.

[0020] As the working face advances, a backfill-type deep-buried tunnel is laid at the bottom of the pit. In this embodiment, the backfill-type deep-buried tunnel can be understood as a structure with a certain cross-sectional space designed to accommodate linear engineering projects such as belt conveyors and roads. This application does not specifically limit the specific structure of the backfill-type deep-buried tunnel; the provided structure is for reference only. Users can use other tunnels that can be laid out in sections according to their actual needs. The backfill-type deep-buried tunnel in this embodiment includes multiple vertical oval-shaped cross-section tunnel units continuously spliced ​​along the tunnel axis. Each vertical oval-shaped cross-section tunnel unit includes longitudinally equidistantly arranged arc-shaped H-shaped steel frames 1. A three-dimensional steel mesh 2 is tied to the outside of the arc-shaped H-shaped steel frames, and a steel-concrete composite structure is formed by pouring a high-strength concrete layer 3.

[0021] In this embodiment, the tunnel is gradually constructed as the internal dumping progresses. Considering the spatiotemporal effects of the end walls, working walls, and internal dumping, the tunnel construction is completed before internal dumping backfilling. This embodiment employs a segmented backfill-type deep-buried tunnel. The backfill-type deep-buried tunnel is gradually laid out as the working face advances. For example, after a certain space is initially formed at the bottom of the open-pit mine, the axial position and starting point of the backfill-type deep-buried tunnel are determined according to the direction of the internal dumping site's advancement and the planned path of the belt conveyor. The internal dumping operation progresses gradually from one side of the pit bottom to the other. After each section is completed, the corresponding backfill-type deep-buried tunnel is installed. Backfilling is immediately carried out on top of the tunnel after installation, using stripped material from the internal dumping site. During backfilling, layered compaction is required to ensure the density of the backfill soil and prevent subsequent settlement from damaging the tunnel structure. Within the backfilled tunnel sections, a belt conveyor system is gradually installed and connected to the previously constructed inclined tunnel belt conveyor to form a continuous raw coal transportation tunnel. When the internal spoil heap is advanced to the terminal position, the backfill channel is also closed at the same time, forming a complete, continuous and closed raw coal transportation channel from the bottom of the pit to the surface production system. At the same time, auxiliary systems such as ventilation, drainage and monitoring are also installed inside the channel.

[0022] Due to the need for soil removal in the later stages, the backfill soil above the deep-buried tunnel can reach more than 300m. This ultra-high backfill soil exerts a great earth pressure on the tunnel structure, which can be improved by reducing the load and increasing the structural resistance.

[0023] The method in this embodiment uses the stripped material from the internal spoil disposal site as backfill material, which reduces the cost of external spoil disposal and realizes resource recycling; it avoids the cost and time loss caused by frequent relocation of the end-belt conveyor and improves the continuity and stability of the system.

[0024] The above description is merely a specific 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 deploying a continuous coal mining system based on a backfilled deep-buried tunnel, characterized in that, First, the original rock section inclined tunnel is used for raw coal transportation. As the working face advances, an internal spoil disposal site is formed. Second, a backfilled deep burial channel is formed at the bottom of the pit. Belt conveyors are installed in the backfilled deep burial channel and connected to the belt conveyors installed in the inclined tunnel to transport the raw coal from the pit to the surface production system.

2. The layout method of a continuous coal mining system based on a backfilled deep-buried tunnel as described in claim 1, characterized in that, The aforementioned inclined tunnel in the original rock section is set along the working face according to the working face position of the continuous mining equipment.

3. The layout method of a continuous coal mining system based on a backfilled deep-buried tunnel as described in claim 2, characterized in that, A belt conveyor is installed in the original rock inclined tunnel, and the belt conveyor connects to the ground production system after exiting the inclined tunnel.

4. The layout method of a continuous coal mining system based on a backfilled deep-buried tunnel as described in claim 1, characterized in that, The formation process of the backfill-type deep buried channel is as follows: the internal soil dumping operation is gradually advanced from one side of the pit bottom to the other side. After each section is completed, the corresponding backfill-type deep buried channel is installed in that section. After the installation is completed, backfilling is carried out immediately on top of it. The backfill material comes from the stripping material of the internal soil dumping site. During the backfilling process, it is compacted in layers and gradually erected as the internal soil dumping is advanced.

5. The layout method of a continuous coal mining system based on a backfilled deep-buried tunnel as described in claim 4, characterized in that, The backfilled deep-buried tunnel shall have a backfill depth of no more than 300m.

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