Medium-deep hole blasting suspended top treatment method in sublevel caving method

Abstract

The invention discloses a medium-deep hole blasting suspended top treatment method in a sublevel caving method. The medium-deep hole blasting suspended top treatment method comprises the following steps that first encrypted blast holes are additionally perforated between two rows of normal blast holes close to the suspended top area, second encrypted blast holes are additionally perforated in theouter sides of the two rows of normal blast holes, and the first encrypted blast holes and the second encrypted blast holes are then exploded together through blast holes in a rear-section normal blast hole row. The medium-deep hole blasting suspended top treatment method has the advantages that the operation process is simple, safe, efficient and reliable, under the condition that the normal sidecaving row blasting is not affected, only a small amount of vertical holes need to be additionally perforated to serve as the encryption blast holes, then the suspended top problem can be solved, a series of processes of new digging projects and high-difficulty construction hole sites are reduced, the phenomenon that the construction period is prolonged due to the suspended top is effectively shortened, the operation technology is simple, the requirement for the hole position of the encrypted blast holes is low, and the method is easy to popularize and apply.

Description

technical field [0001] The invention belongs to the technical field of mining, and in particular relates to a method for treating the suspended roof of medium and deep hole blasting. Background technique [0002] Pillarless segmented caving method is the most commonly used mining technology in segmented caving method. This method also leads to new types of upward mechanized medium and deep hole layered filling method, layered rock drilling followed by filling method and many other methods. . But the substantive characteristics of these methods all are to excavate the rock-drilling approach in the ore body, and then utilize upward fan-shaped hole blasting in the rock-drilling approach to carry out the method for back mining. [0003] However, in the process of mining operations, sometimes due to structural planes such as geological horizontal faults, inaccurate drawings, or inaccurate construction positions, the hole depth design is not in place, the holes are not drilled in...

AI Technical Summary

Problems solved by technology

There is no new engineering quantity in this method, but due to the constraints of geological conditions and the height of the suspended roof, the height of the roof and the number of required rows cannot be controlled, and only one row of blastholes can be blasted each time. The construction is cumbersome and time-consuming, and the ore Large loss

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