Double-slope stope bottom structure with gently inclined ore body and arrangement method thereof

Abstract

The application discloses a double-slope stope bottom structure with gently inclined ore body and a layout method thereof, which comprises the following steps: arranging the whole stope bottom structure along the boundary of the ore body bottom; determining the starting slope point and the flat slope point according to the inclined direction of the stope boundary and the ore body boundary; and adopting double-slope arrangement for the main project of the bottom structure, that is, the ore drawing connection slope and the ore receiving trench are both slopes, the slope is generally 10-12 degrees, and the maximum is not more than 12 degrees, and the two are arranged in parallel with the same slope and are generally parallel to the inclined direction of the ore body. The application has the beneficial effect that, compared with the conventional flat-slope bottom structure, the distance between the bottom structure and the boundary of the ore body bottom is reduced on the whole, and the balance between the ore recovery and the waste rock mixing caused by the position of the bottom structure can be effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground metal mine mining, in particular to a stope bottom structure arrangement method for reducing the amount of waste rock mixed into an inclined ore body. BACKGROUND

[0002] The stope bottom structure is a passageway for ore transportation from the stope to the outside, which is usually composed of ore drawing roadway, ore drawing access, ore receiving trench and other engineering, and is an important part of the stope structure. It largely determines the production capacity of the stope and technical and economic indicators such as ore loss, dilution and waste rock mixing. Therefore, designing a reasonable stope bottom structure for different ore body conditions is an important part of the mining process.

[0003] At present, the related roadway engineering of the stope bottom structure in underground mines is usually arranged in a flat slope, and the roadway engineering is basically a flat roadway. For the upper and middle parts of the ore body, the flat slope of the bottom structure can simply realize the ore drawing function, but for the lower part of the ore body adjacent to the ore-rock contact zone, especially when the bottom boundary of the ore body is inclined, the arrangement height of the bottom structure is too high, which will cause ore loss, and the arrangement height is too low, which will increase a large amount of waste rock mixing, thereby affecting the economic benefit of the mine. SUMMARY

[0004] The technical problem to be solved by the present application is that for the lower part of the ore body adjacent to the ore-rock contact zone, the arrangement height of the bottom structure is too high, which will cause ore loss, and the arrangement height is too low, which will increase a large amount of waste rock mixing, thereby affecting the economic benefit of the mine. Therefore, a double-inclined slope stope bottom structure with a gently inclined bottom and its arrangement method are provided.

[0005] The technical scheme of the present application is: a double-inclined slope stope bottom structure with a gently inclined bottom, comprising: a rock drilling chamber arranged at the upper part of the stope; a rock drilling horizontal pillar reserved between adjacent rock drilling chambers; a top boundary of the bottom structure; a downward blast hole arranged from the rock drilling chamber downward to the top boundary of the bottom structure; an ore drawing communication slope arranged along the long axis direction of the stope; an ore receiving trench arranged in parallel with the ore drawing communication slope; and an ore drawing access arranged in a flat slope to connect the ore drawing communication slope and the ore receiving trench.

[0006] In the above scheme, the slope of the ore drawing communication slope and the ore receiving trench is 10°-12°.

[0007] In the above scheme, the plane included angle between the ore drawing communication slope and the ore receiving trench is 40°-50°.

[0008] In the above scheme, the net length of the ore drawing access is 1.5 times the length of the ore drawing equipment.

[0009] In the above scheme, the interval between two adjacent ore exit routes is 6 m to 10 m.

[0010] The arrangement method of the bottom structure of a double-slope stope with a gently sloping bottom includes the following steps: the upper part of the stope is arranged as drilling chambers, horizontal drilling pillars are reserved between the drilling chambers, downward blast holes are arranged, the bottom boundary of the downward blast holes extends to the top boundary of the bottom structure of the ore extraction, and the bottom structure is formed by the ore receiving trench and cutting riser; Along the long axis of the mining area, ore-exiting connecting slopes and receiving trenches are arranged. The ore-exiting connecting slopes and receiving trenches start from the starting point and end at the leveling point, with an overall slope of 10°-12°. Ore-exiting access roads are arranged between the ore-exiting connecting slopes and receiving trenches, and the ore-exiting access roads are arranged with a level slope. After the ore-exiting connecting slopes, ore-exiting access roads and receiving trenches are formed, a groove is dug from the cutting well, and the bottom ore-exiting funnel is formed using the receiving trench. The net height of the bottom ore-exiting funnel is 12m-20m, and the top boundary of the bottom structure is arranged with the same slope as the ore-exiting trench.

[0011] The advantages of this invention are that it is easy to arrange the mining site and facilitates on-site construction. It is suitable for irregular, gently dipping ore bodies with a bottom boundary dip angle of 5° to 10°, and can effectively balance the ore recovery and waste rock mixing. Attached Figure Description

[0012] Figure 1 This is an AA cross-sectional orthographic projection of the bottom structure of a double-slope stope suitable for gently inclined ore bodies according to the present invention.

[0013] Figure 2 yes Figure 1 BB section side projection view;

[0014] Figure 3 yes Figure 2 CC section top view projection;

[0015] In the diagram, 1. Mine access slope, 2. Mine access road, 3. Mine receiving trench, 4. Bottom structure top boundary, 5. Drilling horizontal pillar, 6. Drilling chamber, 7. Stope boundary, 8. Ore body boundary, 9. Intermediate level roadway, 10. Starting point, 11. Slope, 12. Cutting riser, 13. Downward blast hole. Detailed Implementation

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments implemented by those skilled in the art without creative effort are within the protection scope of the present invention.

[0017] like Figure 1As shown, the bottom boundary 8 of the ore body is inclined, and the top boundary 4 of the bottom structure is also inclined. The stope is divided into two parts: the upper part is the main part of the stope, and the lower part is the bottom structure of the stope. The main engineering works of the bottom structure of the lower stope, such as the ore-exit connecting slope 1, the ore-exit access road 2, and the ore-receiving trench 3, are all arranged in the rock mass to reduce ore loss, but should not be too far from the boundary of the ore body. The ratio of ore to rock in the bottom structure is determined comprehensively based on the grade of the ore body itself and the grade requirements of the ore extraction.

[0018] like Figure 2 As shown, the upper part of the stope is mined by downward blast holes 13 arranged in the rock drilling chamber 6, and the lower part of the stope is formed by upward fan-shaped blast holes arranged in the trench 3. The height of the bottom structure is 12m~20m, and the specific height is determined by the drilling depth of the rock drilling equipment.

[0019] The specific layout of the main projects is combined Figure 3 As shown, at the mid-section level roadway 9, a suitable starting point 10 is selected based on the stope boundary 7 to arrange the ore-exit connecting slope. The specific length is determined according to the mining length. A leveling point 11 is arranged at the other end boundary of the stope. The overall slope of the ore-exit connecting slope 1 is 10°–12°. The receiving trench 3 is arranged parallel to the ore-exit connecting slope, also using a slope arrangement, starting from the starting point 10 and ending at the leveling point 11, with an overall slope of 10°–12°. An ore-exit access road 2 is arranged between the ore-exit connecting slope 1 and the receiving trench 3, using a level slope (i=0). The spacing between ore-exit access roads 2 is generally 6m–10m, the length of ore-exit access road 2 is generally 1.5 times the length of the ore-exit equipment (such as a loader), and the plane angle between ore-exit access road 2 and ore-exit connecting slope 1 is generally 40°–50°, etc. The specific parameters are adjusted according to the size of the ore-exit equipment.

[0020] The arrangement method of the bottom structure of a double-slope stope with a gently sloping bottom includes the following steps: the bottom structure of the stope is arranged inclinedly along the boundary of the bottom of the ore body. The upper part of the stope is arranged as drilling chambers, and horizontal drilling pillars are reserved between the drilling chambers. Downward blast holes are arranged, and the bottom boundary of the downward blast holes extends to the top boundary of the bottom structure of the ore extraction. The bottom structure is formed by the receiving trench and the cutting riser 12. The ore extraction connecting slope and the receiving trench are arranged along the long axis of the stope. The ore extraction connecting slope and the receiving trench start from the starting point 10 and end at the leveling point 11, with an overall slope of 10°-12°. The starting point 10 and the leveling point 11 of the ore extraction connecting slope 1 and the receiving trench 3 are determined according to the stope boundary. Usually, the starting point is arranged at one end of the stope (the lower end of the ore body), and the leveling point is arranged at the other end. An ore-exit access road is arranged between the ore-exit connecting slope and the ore-receiving trench. The ore-exit access road is arranged on a flat slope. After the ore-exit connecting slope, ore-exit access road and ore-receiving trench are formed, a groove is dug from the cutting well, and a bottom ore-exit funnel is formed using the ore-receiving trench. The net height of the bottom ore-exit funnel is 12m to 20m. Half of the ore-exit funnel formed by the bottom structure is ore body and half is rock. The top boundary of the bottom structure is arranged with the same slope as the ore-exit trench.

[0021] Compared to conventional flat-slope bottom structures, which vary in distance from the ore body boundary and result in excessive ore loss if the structure is too high or excessive waste rock contamination if the structure is too low, this invention reduces the average distance between the bottom structure and the bottom boundary of the ore body, effectively solving the balance problem between ore recovery and waste rock contamination caused by the location of the bottom structure.

Claims

1. A method for arranging the bottom structure of a double-slope stope with a gently sloping ore body, characterized by: The bottom structure of the double-slope stope with a gently sloping bottom includes: a drilling chamber (6), which is located in the upper part of the stope; a horizontal drilling pillar (5), which is reserved between adjacent drilling chambers; a top boundary of the bottom structure (4); downward blast holes (13), which are arranged from the drilling chambers downwards to the top boundary of the bottom structure; an ore-exit connecting slope (1), which is arranged along the long axis of the stope; a receiving trench (3), which is arranged parallel to the ore-exit connecting slope; and an ore-exit access road (2), which is set with a flat slope to connect the ore-exit connecting slope and the receiving trench. The arrangement method includes the following steps: the upper part of the stope is arranged as drilling chambers, horizontal drilling pillars are reserved between the drilling chambers, downward blast holes are arranged downwards, and the bottom boundary of the downward blast holes extends to the top boundary of the ore-exit bottom structure. The bottom structure is formed by the receiving trench and the cutting well (12); the ore-exporting connecting slope and the receiving trench are arranged along the long axis of the mining area. The ore-exporting connecting slope and the receiving trench start from the starting point (10) and end at the leveling point (11), with an overall slope of 10°-12°. The ore-exporting access road is arranged between the ore-exporting connecting slope and the receiving trench. The ore-exporting access road is arranged on a level slope. After the ore-exporting connecting slope, the ore-exporting access road and the receiving trench are formed, a groove is pulled from the cutting well, and the bottom ore-exporting funnel is formed by the receiving trench. The net height of the bottom ore-exporting funnel is 12m~20m. The top boundary of the bottom structure is arranged with the same slope as the ore-exporting trench.

2. The arrangement method of the bottom structure of a double-slope stope with a gently sloping bottom as described in claim 1, characterized in that: The slope of the ore-exit connecting slope and the ore-receiving trench is 10°-12°.

3. The arrangement method of the bottom structure of a double-slope stope with a gently sloping bottom as described in claim 1, characterized in that: The included angle between the ore-exit connecting slope and the ore-receiving trench is 40°~50°.

4. The method for arranging the bottom structure of a double-slope stope with a gently sloping bottom as described in claim 1, characterized in that: The net length of the ore outlet access route is 1.5 times the length of the ore outlet equipment.

5. The arrangement method of the bottom structure of a double-slope stope with a gently sloping bottom as described in claim 1, characterized in that: The interval between two adjacent ore exits is 6 m to 10 m.

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