ChemInform Abstract: The Explosive Properties of Hydroperoxides of m- and p-Diisopropylbenzenes.

This paper aims at providing a sound theoretical solution to auxiliary central hole and the cutting parameters. For this purpose, the forming mechanism of V-cut cavity for cutting blasting was performed based on the hypothetical rock breaking mechanism of V-cut blasting. A theoretical solution for increasing the critical depth of the auxiliary center cuthole and the criteria for increasing the cuthole diameter of various types of cutholes when the rock attributes, explosive properties, and cuthole dip angle are constant are proposed. (1) If charging length le < 0.75H/sin θ, no auxiliary cuthole is needed. (2) If 0.75H/sin θ < le < 0.75H/sin θ + (2∼4) × 0.1, a central vertical auxiliary hole is needed. (3) If 0.75H/sin θ + (2∼4) × 0.1 < le < 0.75(H/sin θ + Hi/sin θi), a shallow inclined hole is needed. (4) If le > 0.75(H/sin θ + Hi/sin θi), both the central vertical cuthole and the shallow inclined cuthole are needed. Meanwhile, the theoretical solution was verified by numerical modelling with ANSYS/LS-DYNA. Moreover, the field implementation of the V-cut and the auxiliary hole effectively improved the blasting effect in both efficiency and economy.

Download Full-text

Influence of structural and textural features of ores and rocks on mine dust explosion hazard during development of pyrite deposits

E3S Web of Conferences ◽

10.1051/e3sconf/202019203017 ◽

2020 ◽

Vol 192 ◽

pp. 03017

Author(s):

Marina Rylnikova ◽

Viktor Fedotenko ◽

Natalia Mitishova

Keyword(s):

Sulfur Content ◽

Underground Mining ◽

Environmental Safety ◽

Ore Deposits ◽

Dust Explosion ◽

Explosion Hazard ◽

Mining Operations ◽

Mine Dust ◽

Mining Works ◽

Explosive Properties

In the practice of mining works, sulfide-dust explosions often occur during underground development of pyrite ore deposits: copper-zinc, lead-zinc, copper-nickel, antimony, and others. This makes it necessary to conduct researches aimed at improvement of methods for studying the explosive properties of sulfide dust and development of industrial and environmental safety requirements for mining operations. Currently, there is no generally accepted state-approved regulatory procedure for assessment of sulfide dust explosion hazards during underground mining operations in Russia. Assessment of the type and concentration of mine sulfide dust in the underground mine atmosphere is vitally important for solving this problem. In practice, ores even with a sulfur content of less than 35% can constitute a sulfide dust explosion hazard, although mine dust with a sulfur content of less than 35% does not explode in laboratory conditions. To identify the cause of this phenomenon and develop technical solutions for ensuring safety of underground mining operations, change in the sulfur content of various mine dust fractions obtained from primary disintegration of sulfides was studied.

Download Full-text

Theoretical analysis of the effects of nitration of the explosive properties of triazoles: 4-nitro-2H-1,2,3-triazole and 4,5-dinitro-2H-1,2,3-triazole

Journal of Molecular Structure THEOCHEM ◽

10.1016/0166-1280(95)04131-o ◽

1995 ◽

Vol 337 (2) ◽

pp. 189-197 ◽

Cited By ~ 6

Author(s):

V.N. Gamézo ◽

S. Odiot ◽

M. Blain ◽

S. Fliszár ◽

A. Delpuech

Keyword(s):

Theoretical Analysis ◽

Explosive Properties

Download Full-text

A prediction model for amplitude-frequency characteristics of blast-induced seismic waves

Geophysics ◽

10.1190/geo2017-0228.1 ◽

2018 ◽

Vol 83 (3) ◽

pp. T159-T173 ◽

Cited By ~ 1

Author(s):

Chenglong Yu ◽

Zhongqi Wang ◽

Wengong Han

Keyword(s):

Prediction Model ◽

Field Experiment ◽

Seismic Waves ◽

Initial Pressure ◽

Dominant Frequency ◽

Frequency Characteristics ◽

Adiabatic Exponent ◽

The Difference ◽

Explosive Properties

We have developed a prediction model for dominant frequency and amplitude of blast-induced seismic waves. A blast expansion cavity is used to establish a relationship between the explosive properties and amplitude frequency of blast-induced seismic waves. In this model, the dominant frequency and amplitude of blast-induced seismic waves are mainly influenced by the initial pressure and the adiabatic exponent of explosives in the same medium. The dominant frequency increases with the decreasing initial pressure or the increasing adiabatic exponent. This prediction model is compared with the experiments. The difference in the blast cavity between the prediction model and the field experiment is in the range of 5%–9%, and the difference in the dominant frequency is within 18.8%–46.0%. The comparison indicates that the model can reasonably predict the frequency and amplitude of blast-induced seismic waves.

Download Full-text