A Method for Suspended Roof Treatment of Medium and Deep Hole Blasting in Subsection Caving Method
A segmented caving method and deep hole blasting technology, which is applied in the field of medium and deep hole blasting suspended roof treatment, can solve the problems of uncontrollable roof height and required row number, large ore loss, and cumbersome construction, etc., and is easy to promote and application, the effect of less charge and wide range of effective action
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[0040] see figure 1 and figure 2 , the layout of blastholes in the illustration is the blasting treatment method of the present invention for the suspended roof phenomenon caused by the sub-level caving method. In this segmented caving method, the upward vertical parallel blast holes drilled by the upward drilling jumbo to the upper ore body are used in the rock drilling route 42 of the ore body, and the blast holes arranged in all the blasting sections are drilled. After the completion, the suspended roof area 1 was produced when the ore body in a certain area was blasted and dropped ore.
[0041] The method of the present embodiment to solve the suspended roof area 1 is to add the first encrypted blast hole 31 between the two rows of normal blast hole rows 2 close to the suspended roof area 1, and each outside of the two rows of normal blast hole rows 2 Refill the second encrypted blast hole 32. After the encrypted blast hole is drilled, according to the height difference...
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