What are the layout methods for the deep hole in the underground?

The main layout methods are: fan-shaped arrangement, parallel arrangement and bundle arrangement. As shown in Figure 1.

Schematic diagram of the arrangement of deep holes in Figure 1.

(É‘) scalloped hole arrangement; (b) parallel hole arrangement; (c) bundled hole arrangement

The arrangement of the fan-shaped hole in the rock-boring roadway is small, the arrangement of the blasthole is flexible, the number of movements of the drilling equipment is small, the fan-shaped holes are arranged radially, the spacing of the holes is small, the hole bottom distance is large, the blockage of the ore is uneven, and the blasthole is utilized. The rate is not high; the parallel hole arrangement is mainly used for ore body regularization, where the ore block is required to be uniform.

The scalloped holes are arranged horizontally, vertically, and obliquely, with horizontal scallops and vertical scallops being used more.

The common arrangement of horizontal fan-shaped holes is shown in Figure 2: (1) the rock drilling patio is located in the center of the lower part of the ore block; (2) the rock drilling patio is arranged at the diagonal of the ore block; (3) the rock drilling patio is located in the mine. In the middle of the block, the ore is required to be stable. (4) The rock drilling patio is located on both sides of the center of the ore block, and the ore is also required to be stable. Among the above four methods, the (2) method is the most widely used.

Figure 2 Schematic diagram of the arrangement of horizontal, vertical and inclined fan-shaped holes

Vertical and inclined fan-shaped holes are drilled from the rock drilling alley. The common form is shown in Figure 2.

When the beam-shaped hole is arranged to fall into ore, the thickness of the falling ore layer is 10-20 m. Compared with the deep hole of the fan-shaped arrangement, the total length of the deep hole is increased by 50%, and the unevenness of the deep hole is more different. This method is rarely used in mining mining, but mainly used to return to the mining column.

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