Open bench inter-hole differential control blasting method

Abstract

An embodiment of the invention discloses an open bench inter-hole differential control blasting method, which relates to the technical field of mining and is invented for solving the problems that resulting fragmentation degree needs to be better, blast vibration damage needs to be reduced, and large-scale blasting needs to be implemented effectively. The method includes: subjecting blast holes in a same row to inter-hole differential accumulation according to delay time of 1-5ms per hole-pitch meter, and performing inter-hole differential interval blasting; subjecting the blast holes in all rows to inter-hole differential accumulation according to the delay time of 10-30ms per row-spacing meter, and performing inter-row differential interval blasting; and filling at least one of the blast holes with a plurality of priming bombs or spaced charged explosive, and performing intra-hole differential interval blasting. The method is applicable to open-pit mining, and also applicable to large-scale earth-rock excavation engineering, large-scale hydropower engineering, large-scale civil engineering, large-scale underground workshop excavation and the like.

Description

technical field [0001] The invention relates to the technical field of mining engineering, in particular to a blasting method with differential control between open-pit step holes. Background technique [0002] Step blasting, also known as step blasting, refers to the blasting method in which drilling is carried out on pre-designed steps and loaded with columnar charges. It is the most widely used blasting method in modern blasting engineering. Large-scale excavations such as open-pit mining, railway and road cutting engineering, hydropower engineering, trench foundation pit excavation, and underground cavern excavation are inseparable from step blasting. [0003] Millisecond blasting, also known as millisecond blasting, is a method of using millisecond detonators or other millisecond delayed initiation devices to achieve sequential detonation of charges. Due to the extremely short time interval between the explosions of the front and rear adjacent charge packs, the energy ...

AI Technical Summary

Problems solved by technology

[0006] The delay time of the high-precision nonel detonator is fixed, and the interval between the holes is very limited. Usually, multiple blastholes detonate at the same time, which not only leads to the increase of seismic waves, but also causes damage to the slope and the surrounding environment to a certain extent. , and the crushing effect is poor, and the large block rate is high

Especially when blasting with multiple rows of holes, this phenomenon is more obvious, which limits the number of blasting rows and limits the blasting scale to a certain extent.

The application of digital electronic detonators has just started, and a systematic blasting method has not yet been formed

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