Blasting method for complex rock masses of open pit coal mine in arid area

Abstract

The invention discloses a blasting method for complex rock masses of an open pit coal mine in an arid area. The blasting method comprises the following steps of blast hole arrangement, detonating network connection, inspection before detonating, detonating and treatment after detonating. According to the method, a low-detonation-force expanded ammonium nitrate fuel oil explosive with a wave impedance value similar to that of bed rocks is selected, so that the crushing effect of detonation gas on heterogeneous complex rock masses with joints and fracture development can be enhanced, and the crushing effect time of the detonation gas on the rocks is prolonged; small explosive bags are adopted for non-coupling segmented charging, so that when the explosive explodes, the crest value of the compression stress can be sharply reduced along with the increase of the distance from the charging surface to a blast hole wall, the blast hole gap effect is obvious, and the blasting effect is more sufficient; therefore, the volume of the blasted rock masses is small, the blasting muck pile is regular, and convenience is brought to safe operation of mining, loading and transportation; and meanwhile, the impact pressure of impact waves on blast hole rocks and the positive pressure acting time on the hole wall can be reduced, the number of blasting flying rocks is reduced, and the safety of coal mining is improved.

Description

technical field [0001] The invention relates to the technical field of mining blasting, in particular to a method for blasting complex rock mass in an open-pit coal mine in an arid area. Background technique [0002] The characteristics of my country's energy structure determine that coal will be the main energy source in my country for a long period of time, and the demand for energy is also increasing with the rapid economic and social development. In order to effectively improve the service life of each coal mine , it is necessary to adopt efficient coal mining methods. In modern times when mineral resources are becoming more and more scarce, how to extract the ore in the mine economically and safely has become a common problem. The advantages of high recovery rate have become the preferred coal mining method, while the mining method of open-pit coal mines in arid areas mainly adopts blasting mining; [0003] Most of the traditional blasting methods in open-pit coal mines ...

AI Technical Summary

Problems solved by technology

[0003] Most of the traditional blasting methods in open-pit coal mines are complicated in process and difficult to operate, and the blasting energy cannot be evenly distributed. In addition, since most open-pit coal mines in arid areas have heterogeneous and complex rock mass structures, traditional blasting methods are prone to large explosions after blasting. The large rock masses and irregular blast piles will affect the safe operation of mining, loading and transportation. In addition, the traditional blasting method is also prone to produce a large number of blasting flying rocks, which will bring harm to the safety facilities and equipment in the mining site and reduce the Therefore, the present invention proposes a complex rock mass blasting method in an open-pit coal mine in an arid area to solve the problems existing in the prior art

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