Method for treating hanging arch through medium-length hole blasting
A technology of deep hole blasting and fan-shaped medium and deep holes, which is applied in earth drilling, ground mining, underground mining, etc., and can solve problems such as safety production hazards, high mining loss rate, and waste of resources, so as to ensure operation safety and improve mining efficiency. The effect of recovery
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[0019] Such as Figure 1 to Figure 3 Shown: On the top rock layer of the mining roadway 1, the first row of medium-deep holes 3, the second row of medium-deep holes 4, and the third row of medium-deep holes 5 are set in sequence from the suspended roof area 2 to the mining roadway. Each row of medium-deep holes The fan-shaped deep holes are arranged in a fan shape, and the adjacent rows of deep holes are arranged alternately. The first row of three rows of deep holes has a face angle of 60°, the second row of four rows of deep holes has a face angle of 70°, and the third row of deep holes has a face angle of 70°. The 5 rows of middle and deep holes have a face angle of 90°. The first row of middle and deep holes 3 and the second row of middle and deep holes 4 extend to the suspended roof area 2; The nonel is used to fill the medium-deep hole with explosives, which will cause the suspended roof to collapse when the explosives are detonated.
[0020] The fan-shaped middle and...
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