Sectional rock drilling stage mining method

1) Arrangement of nuggets - According to the thickness of the ore body, the long axis of the mine can be arranged in a vertical direction along the strike. Generally, when the thickness of the ore body is less than 15 meters, the mine room is arranged along the strike. When the ore and surrounding rock are extremely stable, this limit can be increased to 20 to 30 meters. Generally, if the thickness of the ore body is greater than 20 to 30 meters, the ore blocks should be arranged vertically.

2) Stage height - generally 50 to 70 meters. The stage height is limited by the stability of the surrounding rock, the stability of the ore body and the high patio excavation technology. The stage height of the step-by-step rock-rock mining method is generally 50-70 meters. Since the goaf of this method is gradually exposed, the height of the stage can be larger.

3) Mine length

The length of the mine is determined by the stability of the surrounding rock and the allowable exposed area of ​​the ore body. At the same time, the length of the mine is related to the inclination of the ore body. The slower the inclination of the ore body, the greater the pressure on the pillar of the rock. At this time, the length of the mine should be reduced.

Under normal circumstances, the length of the mine is 40 to 60 meters.

※ If you use electric tweezers to mine, you should also improve the effective transportation distance of electric tweezers.

4) Mine width

When the mine is arranged along the strike, the width of the mine = the thickness of the ore body

When the mine is cut and arranged, it is generally 15 to 25 meters (mainly improving the stability of the rock).

5) Section height

The height of the section is related to the way the rock is drilled and the capacity of the rock drilling equipment used.

1 When drilling shallow holes, the height is not more than 6 meters.

2 When drilling in deep hole drilling, it can be divided into heights of 8 to 10 meters (YG-80, YG-60)

3 When drilling deep holes, the height can be 15-20 meters, or larger.

(The height of the sectioned rock roadway depends on the external dimensions of the rock drilling equipment. The working time is generally not less than 2 to 2.5 meters, and the width is generally not less than 2 meters).

6) pillar size

1 Top column thickness - The thickness of the top column is determined by the stability of the rock and the thickness of the ore body. Usually 6 to 10 meters.

The width of 2 columns—when arranged along the strike, is generally 8 to 12 meters. When the cutting is arranged, it is generally 10 to 14 meters. Why is the width of the vertical alignment time column larger than that of the cutting direction? Because the thickness of the ore body is subject to greater pressure. When the ore body is steeply inclined, the thickness is not large, and the ore is very stable, the width of the column

Can take a small value.

3 The height of the bottom column - the height of the bottom column depends mainly on the form of the bottom structure and the stability of the rock.

Since the recovery of the bottom column is the most difficult, the ore loss and depletion are relatively large, so the conditions of the bottom column should be lowered as far as possible.

When using the electric bottom structure, the height of the bottom column can be 7 to 11 meters.

When loading and unloading directly from the mine hopper, the height of the bottom column can be 4-6 meters.

7) Funnel spacing - generally 5.5 to 6 meters, also 7 meters. Some books are 5 to 7 meters.

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