Mine underground filling system

Abstract

The invention discloses a mine underground filling system, and relates to the technical field of iron ore mining and filling, the system comprises a filling area, the filling area is divided into a plurality of filling units; a plurality of first I-shaped pipes are arranged at the top of each filling unit, the bottom ends of the first I-shaped pipes are located in the front filling units, and first openings located above the front filling units are formed in the tops of the first I-shaped pipes; a plurality of second I-shaped pipes are arranged between the adjacent filling units at the same height, the ends, without second openings, of the second I-shaped pipes are located in the front filling unit, and the ends, with the second openings, of the second I-shaped pipes are located in the rear filling unit. According to the system, through division of multiple filling units and structural design of the I-shaped pipe, filling cooperation in the vertical direction and the horizontal direction between the units is achieved, the integrity and compactness of a filling body are improved, the problem that connection between layers and the units is weak easily occurring in traditional filling is solved, and the system is suitable for mine underground goaf filling operation and particularly suitable for goaf with great depth-width ratio difference.

Description

Technical Field

[0001] This invention relates to the field of iron ore mining backfilling technology, specifically to an underground mine backfilling system. Background Technology

[0002] During mining operations, numerous goaf areas are formed. If not addressed promptly, these can easily lead to safety hazards such as surface subsidence and mine pressure manifestation. Backfilling mining methods are widely used because they can effectively control the stability of goaf areas. For goaf areas with significant height-to-width ratios, due to limitations in backfilling equipment capacity, backfill material properties, and construction space, a layered, multi-stage backfilling approach is typically adopted. This involves filling multiple layers from bottom to top, each layer reaching a certain height, and allowing the backfill material to solidify before proceeding with the next layer of backfilling.

[0003] However, existing layered multiple-filling technology has significant drawbacks: the connections between different layers of fill are mostly simple surface-to-surface contact connections, lacking effective mechanical interlocking or embedded connection structures. Due to shrinkage deformation during the solidification process of the fill material and the interval between the pouring times of the upper and lower fill layers, gaps or weak bonding zones easily form at the contact surfaces, resulting in extremely low connection strength. Furthermore, if a filling area at the same height needs to be segmented, similar insufficient connection strength problems exist between adjacent filling segments.

[0004] Insufficient connection strength leads to a significant decrease in overall support strength: under the complex ground pressure in mines, the backfill is prone to slippage, cracking, or even instability along the contact surface, failing to effectively support the goaf roof and potentially causing secondary safety accidents. To improve the connection effect, some technologies have attempted to install steel mesh or pre-embed short steel bars at the contact surface. However, the bonding area between the steel mesh and the backfill is limited, and pre-embedded short steel bars can only provide local point support, making it difficult to form an overall load-bearing system. For goafs with significant height-to-width ratios, the reinforcement effect still cannot meet the engineering safety requirements.

[0005] Furthermore, existing technologies often lack systematic planning in the division of filling units, and the provision of construction space between adjacent units is unreasonable, leading to difficulties in the subsequent installation of connection structures. The connecting components are mostly made of ordinary steel, which is prone to corrosion in the humid and corrosive underground environment, further reducing connection reliability. Therefore, developing a technical solution that can achieve efficient three-dimensional connection between filling bodies, improve overall support strength, and is adaptable to layered multiple filling of goafs with significant aspect ratios has become a critical issue urgently needing to be addressed in the mining industry. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a mine underground filling system.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a mine underground filling system, comprising a filling area divided into multiple filling units, each filling unit having multiple first I-shaped tubes at its top, the bottom end of each first I-shaped tube being located inside a front filling unit, and the top of each first I-shaped tube having a first opening located above the front filling unit; multiple second I-shaped tubes are disposed between two adjacent filling units at the same height, the end of each second I-shaped tube without a second opening being located inside the front filling unit, and the end of each second I-shaped tube with a second opening being located inside a rear filling unit.

[0008] Preferably, the first I-shaped tubes are evenly spaced along the horizontal direction at the top of each filling unit, and the distance between two adjacent first I-shaped tubes is 0.8-1.2 meters.

[0009] Preferably, the bottom end of the first I-shaped tube extends into the interior of the pre-filling unit to a depth of not less than 1 / 3 of the height of the pre-filling unit.

[0010] Preferably, the second I-shaped tubes are evenly arranged vertically between two adjacent filling units at the same height, and the vertical distance between two adjacent second I-shaped tubes is 1-1.5 meters.

[0011] Preferably, the first I-shaped tube and the second I-shaped tube are both made of high-strength alloy steel with a yield strength of not less than 345 MPa.

[0012] Preferably, the first I-shaped tube is further provided with a first connecting frame, which fixes multiple first I-shaped tubes of the same filling unit into one piece, and the first connecting frames of different heights are fixedly connected by connecting rods.

[0013] Preferably, a second connecting frame is provided in the middle of the second I-shaped tube, and multiple second connecting frames at the same height are fixedly connected as a whole by connecting rods.

[0014] Compared with the prior art, the present invention provides a mine underground filling system, which has the following beneficial effects:

[0015] 1. The first I-shaped tube enables the longitudinal connection between the upper and lower filling units, and the second I-shaped tube enables the lateral connection between adjacent units at the same height, forming a three-dimensional network. The I-shaped tube extends deep into the filling body and is fixed to the connecting frame, avoiding the defects of traditional face-to-face connection. This significantly enhances the overall shear and compressive strength of the filling body in the goaf with a large height-to-width ratio, and greatly improves the support stability.

[0016] 2. When dividing the filling units with partition plates, construction space is reserved. I-shaped tubes are installed at reasonable intervals, with a vertical spacing of 1.0 meter between adjacent first I-shaped tubes and 1.2 meters between second I-shaped tubes. This ensures the connection effect while avoiding material waste. The welding of the connecting frame to the I-shaped tubes and the connection of the connecting rods are simple, adaptable to the rhythm of layered and multiple filling construction, and improves construction efficiency.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the first I-shaped tube and the first connecting frame in this invention;

[0021] Figure 3 This is a schematic diagram of the structure of the first I-shaped tube in this invention;

[0022] Figure 4 This is a schematic diagram of the structure of the second I-shaped tube and the second connecting frame in this invention.

[0023] In the diagram: 1. Filling area; 2. Filling unit; 3. First I-shaped tube; 4. Second I-shaped tube; 5. First opening; 6. Second opening; 7. First connecting frame; 8. Second connecting frame. Detailed Implementation

[0024] Please combine Figures 1 to 4 As shown, this invention discloses an underground mine filling system, aiming to solve the technical problem of low connection strength between filling bodies in different filling stages during multiple fillings in goafs with large aspect ratios, resulting in a significant decrease in overall support strength. Its core improvement lies in achieving three-dimensional connection between filling bodies by separating filling units and setting a first I-shaped pipe and a second I-shaped pipe, thereby enhancing the overall structural stability.

[0025] First, the filling area 1 in the mine is surveyed and planned. Based on the height and width dimensions and geological conditions of the filling area 1, the filling area 1 is divided into multiple independent filling units 2 using partition plates. Construction space is reserved between adjacent filling units 2 to facilitate the subsequent installation of the second I-shaped pipe 4.

[0026] Before filling the first filling unit 2 (i.e., the pre-filling unit), multiple first I-shaped tubes 3 are installed at their designed top positions. The first I-shaped tubes 3 are made of high-strength alloy steel with a yield strength of 345 MPa. Their bottom ends extend vertically downwards into the interior of the pre-filling unit 2, with the extension depth controlled to 1 / 3 of the height of the pre-filling unit 2, ensuring a stable bond between the first I-shaped tubes 3 and the filling material of the pre-filling unit 2. The first I-shaped tubes 3 are evenly spaced horizontally at the top of the filling unit 2, with a spacing of 1.0 meter between adjacent first I-shaped tubes 3. This spacing ensures connection strength while avoiding material waste. Simultaneously, first connecting frames 7 are installed on the first I-shaped tubes 3. The first connecting frames 7 are made of the same high-strength alloy steel and are welded together to fix multiple first I-shaped tubes 3 of the same filling unit 2 into a single, stable top connecting frame.

[0027] After the installation of the first I-shaped tube 3 and the first connecting frame 7 is completed, multiple second I-shaped tubes 4 are installed between two adjacent filling units 2. The second I-shaped tubes 4 are also made of high-strength alloy steel with a yield strength of not less than 345MPa. Then, filling material is poured into the first filling unit 2. After the filling material solidifies to form the filling body of the front filling unit 2, the construction of adjacent filling units 2 (i.e., the rear filling units) at the same height is carried out. One end with the second opening 6 extends into the construction area of ​​the rear filling unit 2, and the length of the pipe section inside the rear filling unit 2 is 1 / 2 of the width of the rear filling unit 2. The second I-shaped tubes 4 are evenly arranged vertically between two adjacent filling units 2, and the vertical spacing between two adjacent second I-shaped tubes 4 is set to 1.2 meters. In addition, a second connecting frame 8 is installed in the middle of the second I-shaped tube 4. Multiple second connecting frames 8 at the same height are fixedly connected as one unit by welding connecting rods, further enhancing the overall stability of the second I-shaped tubes 4.

[0028] When multiple layers of filling are required, after the filling material in the lower filling unit 2 has solidified and before the construction of the upper filling unit 2, the upper first connecting frame 7 and the lower first connecting frame 7 are fixedly connected by connecting rods, so that the first I-shaped tubes 3 at different heights form a continuous support system. Subsequently, during the construction of the upper filling unit 2, the filling material enters the interior of the first I-shaped tube 3 through the first opening 5 at the top of the lower filling unit 2. After the filling material solidifies, the upper and lower filling units 2 are three-dimensionally connected through the first I-shaped tube 3, rather than the traditional surface-to-surface connection, which greatly improves the connection strength between the upper and lower filling materials.

[0029] In this embodiment, the longitudinal connection between the upper and lower filling units 2 is realized through the first I-shaped tube 3, and the lateral connection between adjacent filling units 2 at the same height is realized through the second I-shaped tube 4, forming a crisscrossing three-dimensional connection network, which effectively improves the overall support strength of the entire filling area 1 and solves the technical problem of layered filling in goaf areas with large height-to-width ratios.

[0030] Through the above-described embodiments, the underground mine filling system of the present invention can effectively improve the connection strength between filling bodies, ensure the overall support stability of goaf areas with large aspect ratios, and has the advantages of simple structure, convenient construction, and good support effect. It is suitable for filling operations in goaf areas with large aspect ratios in various mines.

[0031] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A mine underground filling system, comprising a filling area (1), characterized in that: The filling area (1) is divided into multiple filling units (2). Each filling unit (2) has multiple first I-shaped tubes (3) at its top. The bottom end of the first I-shaped tube (3) is located inside the front filling unit (2). The top of the first I-shaped tube (3) has a first opening (5) located above the front filling unit (2). Multiple second I-shaped tubes (4) are arranged between two adjacent filling units (2) at the same height. The end of the second I-shaped tube (4) without a second opening (6) is located inside the front filling unit (2). The end of the second I-shaped tube (4) with a second opening (6) is located inside the rear filling unit (2).

2. The underground filling system for mines according to claim 1, characterized in that: The first I-shaped tubes (3) are evenly spaced along the horizontal direction at the top of each filling unit (2), and the distance between two adjacent first I-shaped tubes (3) is 0.8-1.2 meters.

3. The underground filling system for mines according to claim 1, characterized in that: The bottom end of the first I-shaped tube (3) extends into the interior of the pre-filling unit (2) to a depth not less than 1 / 3 of the height of the pre-filling unit (2).

4. A mine underground filling system according to claim 1, characterized in that: The second I-shaped tube (4) is evenly arranged vertically between two adjacent filling units (2) at the same height, and the vertical distance between two adjacent second I-shaped tubes (4) is 1-1.5 meters.

5. A mine underground filling system according to claim 1, characterized in that: The first I-shaped tube (3) and the second I-shaped tube (4) are both made of high-strength alloy steel, and their yield strength is not less than 345MPa.

6. A mine underground filling system according to claim 1, characterized in that: The first I-shaped tube (3) is also provided with a first connecting frame (7). The first connecting frame (7) fixes multiple first I-shaped tubes (3) of the same filling unit (2) into one unit. The first connecting frames (7) of different heights are fixedly connected by connecting rods.

7. A mine underground filling system according to claim 1, characterized in that: The second I-shaped tube (4) is provided with a second connecting frame (8) in the middle. Multiple second connecting frames (8) at the same height are fixedly connected as one unit by connecting rods.

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