The mining work of the stage mining method in the horizontal deep hole mining

1) Stage transportation flat roadway and cross-track – generally arranged outside the vein, each of the upper and lower plates is opened along the vein roadway, and the middle side is separated by a certain distance to open the vein edge to form a circular transportation.

(Because this mining method is mostly suitable for thick ore bodies)

For example iron ore is Gongchangling endless conveyor, through pulse spacing of 100 m.

2) Electric roadway (secondary broken roadway)

Generally, the electric ramp is placed at a height of 4 to 5 meters above the transportation level.

The ore is thrown into the mine by electric shovel and then loaded at the transport level.

The electric ramp of this typical scheme is located on the roof of the transportation roadway, and the ore is directly transported into the mine car for shipment.

For electric ramps, there should be a special return air system.

3) Rock drilling patio.

The rock drilling patio is tunneled by the transport crossroads, connecting it to the upper return airway. The location of the rock drilling patio is important, and it has a greater impact on improving rock drilling efficiency and ore recovery. Therefore, when arranging the rock drilling patio, it is necessary to reduce the amount of mining work and make the deep hole arrangement reasonable. According to the actual experience, it is better to arrange the rocking patio at the corner of the mine. It solves the boundary of the mine well and can prevent the phenomenon of residual ore.

If the rock-filled patio is placed in the center of the mine, the free surface of the part due to the proximity of the column and the lower part is insufficient, and the “cannon” (residual mine) is easily generated in these places, and the upper part of the mine is gradually reduced.

The distance to arrange the rock drilling patio should meet the requirements of reasonable blasthole depth.

[Modification] When using a medium-depth hole, the hole depth should not exceed 10 to 12 meters. (some 3 to 15 meters deep)

When using deep holes, the hole depth should not exceed 20 meters (some 15 to 40 meters deep)

In the range of reasonable hole depth, the rock drilling efficiency is relatively high.

4) Rock drilling chamber

When drilling with the YQ-100 deep hole rig , it is generally necessary to cut a special rock drilling chamber. The diameter of the diverticulum is 3.5 to 4.0 meters and the height is 2 to 2.2 meters. In order to ensure sufficient stability of the bottom plate of the upper and lower adjacent rock drilling chambers, the following arrangements are available.

※The distance between the upper and lower rock drilling chambers should not be too small and should be greater than the minimum resistance line.

L>minimum resistance line

â–³>(W)

1 The chambers of the two rock-filled patios are staggered. The diverticulum of the first rock-filled patio bears a layered deep hole.

2 Increase the spacing of the stone chambers so that each chamber can be used to make two rows of holes.

3 The upper and lower collar rock drill chambers in a patio are staggered to avoid overlapping at the same position.

â–³ From the overall point of view, the following points should be noted when arranging the rock chamber:

1 Make the depth of the blasthole reasonable. (Do not make individual holes feature long)

2 to make the blasthole solution enough to control the boundary of the mine;

3 Excavation of rock drilling chambers, patios and connecting roads should not weaken the stability of the columns as much as possible;

4 The ore between the upper and lower collar chambers must have a certain height to maintain the stability of the chamber. (refers to the upper and lower. The Dajishan multi-mine uses a 6-meter spacing.)

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Medical devices alone or in combination refers to any instrument, apparatus, appliances, materials or other articles, including the required software. For in vivo therapeutic effect of the human body surface and not by pharmacological, immunological or metabolic means to obtain, but the medical device products played a supporting role. During use, it is expected to achieve the following purposes: disease prevention, diagnosis, treatment, monitoring, mitigation; injury or disability diagnosis, treatment, monitoring, mitigation, compensation; anatomical or physiological process of research, replacement or modification; pregnancy control.

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