Local thick vein mining method

Abstract

The invention provides a local thick vein mining method which comprises the following steps: S1, arranging a working face along the vein trend, horizontally erecting a bracket in the working face, arranging a top beam of the bracket along a top plate, supporting a shield beam vertical to the top plate and supporting a bottom plate, and when the vein thickness exceeds the maximum length of the support shield beam, stopping the support shield beam; the front end of the supporting shield beam is supported in an auxiliary mode through an auxiliary part; s2, the ore blocks are mined downwards along the tendency of the vein, after two or more cycles of mining in the scaffold are conducted, the vein outside the scaffold is mined at a time, the vein outside the scaffold is mined to the same horizontal height as the vein inside the scaffold, and meanwhile supporting is conducted in the mining process; s3, ore is recycled, after ore recycling is completed, a layered metal net is laid along the ground of the goaf outside the frame, and the layered metal net is anchored to the peripheral rock wall; and S4, rapid hardening filling is conducted on the vein bottom plate side of the area outside the support, a working face regeneration bottom plate is formed, and the distance between the regeneration bottom plate and the top plate is between the minimum length and the maximum length of a supporting shield beam of the support.

Description

Technical Field

[0001] The invention belongs to the technical field of mining, and relates to a vein mining method, in particular to a local thick vein mining method. Background Art

[0002] Gold and other metal veins belong to igneous rocks, and their formation process is gradually formed with volcanic eruptions or crustal compression. Affected by their formation process, these veins have the characteristics of strong up-down continuity, poor left-right and front-back continuity, small blocks, and mostly extending obliquely upward and downward.

[0003] During the mining process of this type of ore vein, the maximum ore vein thickness applicable to the special support used is generally between 2.2 meters and 2.8 meters. When the local ore vein thickness exceeds the length of the support's protective beam, that is, when the local ore vein thickness is greater than the maximum ore vein thickness applicable to the special support, it is necessary to mine outside the support's protective space, that is, to carry out off-frame mining. However, when the special support and the existing mining method are applied to the mining method, there will be a greater mining risk in the space outside the frame, and the safety of off-frame mining cannot be guaranteed. Therefore, it is necessary to provide a mining method that can provide a safe off-frame mining space during the mining process of local thick ore veins to ensure the safety of mining. Summary of the invention

[0004] The purpose of the present invention is to provide a method for mining local thick ore veins to solve the technical problem that when the thickness of the ore vein exceeds the maximum ore vein thickness applicable to the support, the existing mining method has a high safety risk in mining outside the support and is not suitable for application in local thick ore veins.

[0005] To achieve the above purpose, the specific technical solutions of the present invention are as follows:

[0006] A local thick vein mining method, comprising the following steps:

[0007] S1, arrange the working face along the direction of the ore vein, set up the support horizontally in the working face, arrange the top beam of the support along the roof, support the shielding beam vertically to the roof and the bottom plate, and use the auxiliary parts to support the front end of the support shielding beam when the thickness of the ore vein exceeds the maximum length of the support shielding beam;

[0008] S2, the ore block is mined downward along the inclination of the ore vein. After two or more cycles of mining inside the frame, the ore vein outside the frame is mined at one time, and the ore vein outside the frame is mined to the same level as the inside of the frame. At the same time, support is provided during the mining process;

[0009] S3, recovering the ore. After the ore is recovered, a layered metal mesh is laid along the ground of the goaf outside the frame, and the layered metal mesh is anchored to the surrounding rock wall;

[0010] S4, the side of the vein floor in the goaf outside the frame is quickly solidified and filled to form a regenerated floor of the working face. The distance between the regenerated floor and the top plate is between the minimum and maximum lengths of the support shield beam of the support, which is consistent with the inclination of the vein.

[0011] In the step S2, each time the vertical height of the mining inside the frame reaches between 1.8m and 2.4m, the ore vein outside the frame is mined at one time, and the ore vein outside the frame is mined horizontally toward the bottom plate side.

[0012] The metal mesh composite filling body in step S3 and step S4 is the regenerated roof for the next off-frame filling.

[0013] In step S4, the filling body is a high-strength filling body, and after rapid setting and filling for 2 hours, the strength is 2 MPa.

[0014] The beneficial effects of the present invention are as follows: the present invention provides a method for mining local thick ore veins, provides stable support for the support by setting up auxiliary supports, lays a metal mesh outside the support and performs rapid-setting filling, and utilizes the solidified filling body to serve as the regenerated bottom plate of the working face and the regenerated top plate for the next mining outside the support, thereby providing stable support for the support to ensure the safety of mining inside the support. At the same time, the regenerated top plate and the supporting shielding beam of the support work together to provide a safe environment outside the support for mining the ore veins outside the support, thereby ensuring the safety of filling outside the support.

[0015] The technical solution provided by the present invention can achieve safe and efficient resource recovery when the metal ore body is locally thick, and is suitable for promotion and application in the mining of locally thick metal ore bodies. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main structure of the bracket used in the present invention;

[0017] Figure 2 This is a schematic diagram of the state in the mine at step S1 of the present invention;

[0018] Figure 3 This is a schematic diagram of the state in the mine at step S3 of the present invention;

[0019] Figure 4 It is a schematic diagram of the state inside the mine at step S4 of the present invention.

[0020] Explanation of marks in the figure: 1. Support, 101. Top beam, 102. Support and shield beam, 2. Ore vein, 3. Top plate, 4. Filling body of this cycle, 5. Chisel, 6. Filling body of the previous cycle, 7. Ore vein outside the frame, 8. Goaf outside the frame, 9. Regenerated bottom plate, 10. Regenerated top plate, 11. Short flat beam, 12. Auxiliary support rod, 13. Anchoring metal mesh, 14. Ore vein bottom plate. DETAILED DESCRIPTION

[0021] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0022] like Figures 1 to 4 As shown, the present invention provides a local thick vein mining method, which comprises the following steps:

[0023] S1, arrange the working face along the direction of vein 2, and set up horizontally in the working face such as Figure 1 The bracket 1 shown in the figure has a top beam 101 arranged along the top plate 3, and a supporting shield beam 102 vertically supporting the top plate 3 and the bottom plate. Figure 2 As shown; when the thickness of the ore vein 2 exceeds the maximum length of the supporting shielding beam 102, that is, the width in the working face exceeds the maximum supporting length applicable to the support 1, the mining space in the frame formed below the support 1 cannot fully mine the ore vein 2 of the entire thickness. At this time, it is necessary to use auxiliary parts such as short flat beams 11 and auxiliary support rods 12 to assist in supporting the front end of the supporting shielding beam 102;

[0024] S2, using the chiseling machine 5 to mine the ore block downward along the inclination of the ore vein 2, after two or more cycles of mining in the frame, when the vertical height of mining in the frame reaches between 1.8m and 2.4m, the ore vein 7 outside the frame is mined at one time. In this embodiment, when the vertical height of mining in the frame is preferably 2m, the ore vein 7 outside the frame is mined horizontally toward the side of the ore vein bottom plate 14, and the ore vein 7 outside the frame is mined to the same level as the inside of the frame, and support is provided during the mining process;

[0025] S3, recovering the ore. After the ore is recovered, a layered metal mesh is laid along the ground of the goaf 8 outside the frame, and the layered metal mesh is anchored to the surrounding rock wall to form an anchoring metal mesh 13, such as Figure 3 As shown;

[0026] S4, the side of the ore vein floor 14 of the goaf 8 outside the frame is quickly filled with high-strength filling body. After 2 hours of rapid filling, the strength of the filling body reaches 2MPa, and the side close to the support 1 forms the regenerated floor 9 of the working surface. Figures 2 to 4 As shown in the previous cycle filling body 6 and the current cycle filling body 4, the previous cycle filling body 6 is the regenerated bottom plate 9 with the side of the current cycle filling body 4, and the distance between the regenerated bottom plate 9 and the top plate 3 is between the minimum length and the maximum length of the support shield beam 102 of the support 1, which is consistent with the inclination of the ore vein 2; the anchoring metal mesh 13 composite filling body is the regenerated top plate 10 of the next external mining, as shown in FIG. Figure 4 shown.

[0027] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A local thick vein mining method, characterized in that: It includes the following steps: S1, a working face is arranged along the direction of the ore vein (2), a support (1) is horizontally erected in the working face, a top beam (101) of the support (1) is arranged along the top plate (3), a supporting shielding beam (102) is vertically supported by the top plate (3) and the bottom plate, and when the thickness of the ore vein (2) exceeds the maximum length of the supporting shielding beam (102), an auxiliary component is used to provide auxiliary support to the front end of the supporting shielding beam (102); S2, the ore block is mined downward along the inclination of the ore vein (2), and after two or more cycles of mining inside the frame, the ore vein (7) outside the frame is mined once, and the ore vein (7) outside the frame is mined to the same level as the inside of the frame, and support is provided during the mining process; S3, recovering the ore. After the ore is recovered, a layered metal mesh is laid along the ground of the goaf (8) outside the frame, and the layered metal mesh is anchored to the surrounding rock wall; S4, the side of the ore vein floor (14) of the goaf (8) outside the frame is quickly filled to form a regenerated floor (9) of the working face. The distance between the regenerated floor (9) and the top plate (3) is between the minimum length and the maximum length of the support shield beam (102) of the support (1), which is consistent with the inclination of the ore vein (2).

2. A local thick vein mining method according to claim 1, characterized in that: In the step S2, each time the vertical height of the mining inside the frame reaches between 1.8m and 2.4m, the ore vein (7) outside the frame is mined once, and the ore vein (7) outside the frame is mined horizontally toward the side of the ore vein bottom plate (14).

3. A local thick vein mining method according to claim 1, characterized in that: The metal mesh composite filling body in step S3 and step S4 is the regenerated roof (10) for the next external filling.

4. A local thick vein mining method according to claim 1, characterized in that: In step S4, the filling body is a high-strength filling body, and after rapid setting and filling for 2 hours, the strength is 2 MPa.

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