Method for improving bench blasting quality of deep-hole of super-hard rocks

Abstract

The invention discloses a method for improving the bench blasting quality of a deep-hole of super-hard rocks. The method includes the following steps that blast holes are formed in a step of a blast area, hole mesh parameters are determined, and perpendicular drilling is conducted; explosive loading structures are determined, and the explosive loading structures for segmented explosive loading and mixed explosive loading are adopted in the blast holes at the same time; explosives are determined, wherein the explosives are selected according to according to matching coefficients of explosive wave impedance and rock wave impedance; blasting parameters are determined and include the length W of a resistance line of a base plate, the hole pitch a, the row distance b, the super depth h and the blast hole filling length l; and blasting is conducted, wherein the explosives are loaded, the blast holes are filled with stemming on the tops of the blast holes, reverse blasting is conducted from the bottoms of the blast holes, and blasting is conducted in an inter-hole elementary error sequence. According to the method for improving the bench blasting quality of the deep-hole of super-hard rocks, due to the fact that the hole mesh parameters, the explosive loading structures, the explosives, the blasting parameters, the blasting position and the blasting sequence are reasonably selected, multi-way comprehensive functions are achieved, the performance of the explosives is fully achieved, the sufficient reaction of the explosives is ensured, the utilization rate of the blast holes is increased, and the boulder frequency and bedrocks of rock blasting are reduced.

Description

technical field [0001] The invention belongs to the technical field of mine blasting, and in particular relates to a method for improving the quality of deep hole step blasting in extremely hard rocks. Background technique [0002] The quality of the blasting directly affects the mining, transportation, primary crushing, earthquake and safety, and directly affects the economic benefits of the mine. Therefore, how to improve the blasting quality of open-pit mines has become one of the more prominent problems in current open-pit mine production. Improving the quality of blasting is essentially to reduce large pieces and roots. [0003] In recent years, with the development of the mining industry, some large deposits of skarn mineralization have been gradually developed, but because of the extremely high firmness coefficient of ore rocks (f=16-22), problems such as whether the slope is Safety, uneven blasting fragmentation, high percentage of large fragments, low mining effic...

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Problems solved by technology

[0003] In recent years, with the development of the mining industry, some large deposits of skarn mineralization have been gradually developed, but because of the extremely high firmness coefficient of ore rocks (f=16-22), problems such as whether the slope is Issues such as safety, uneven blasting block size, high large block rate, low mining efficiency, serious equipment wear, high cost, and low economic benefit

[0004] Existing blasting technologies are often implemented based on experience. From the perspective of external factors, perceptual optimization measures are lacking in pertinence. Many experiences are no longer suitable for blasting of extremely hard rocks. The quality of blasting for extremely hard rocks is not good. The generation of lumps and roots will affect the efficiency of mining and installation equipment, and secondary blasting is still required to increase the cost of blasting

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