Fundamentos para simulação dos desmontes de rocha por explosivos

Morais, Juarez Lopes de; Gripp, Maria de Fátima Andrade

doi:10.1590/s0370-44672004000400005

Cited by 5 publications

(6 citation statements)

References 1 publication

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“…The study area is located in the São Paulo State in the central eastern part of the Paraná Sedimentary Basin (Zalán et al 1990). Sedimentary rocks that compose the geological setting in the area vary in age from Carboniferous to Permian (Itararé Group, Tatuí Group, and Irati Formation), Upper Cretaceous including the basaltic lava flows, and diabase dykes and sills intruded into the sedimentary rocks (Mio and Gandolfi 1995). According to Bacci (2000), the rock mass is represented by diabase sills that originated from intrusions in the permocarbon sediments present in the Paraná Basin and is strongly diaclased, with subvertical to subhorizontal principal fracture directions.…”

Section: Geological Settingmentioning

confidence: 99%

Influence of rock blast advance direction on boulder generation: a case study

et al. 2020

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In quarries, rock blasting is important for mining and transportation, being the first step in the comminution. Discontinuities present in a rock mass can interrupt the propagation of the shock wave and evacuate gases, thereby reducing the efficiency of the explosives. Differences in the orientation of joint sets and the advancing direction of the mine produce different fragmentation results. In this study, the blastability of a rock mass was evaluated as a function of mining advance direction relative to the direction of the main joint set using particle size curves generated by photo-analysis. The data were analysed for each bench, and the optimal direction of advance was determined as the one to generate the smallest boulders. The particle size curves reveal optimal fragmentation when the mining direction is orthogonal to the main joint set, reducing the number of boulders by 64.40%.

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Section: Geological Settingmentioning

confidence: 99%

Influence of rock blast advance direction on boulder generation: a case study

et al. 2020

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“…A third explosive is widely used, which is the mixture between ANFO and emulsion, the well-known heavy ANFO or blended emulsion. Mixing can occur in different proportions of each explosive so that the properties of the explosive vary with the balance variation (de MORAES, 2004). For example, ŽGANEC et al (2016) showed that the higher the emulsion percentage, the higher the detonation velocity (VoD).…”

Section: Introductionmentioning

confidence: 99%

Characterization of explosive performance parameters: ANFO and explosive emulsion

Vieira¹,

Braga²

2023

ISMJ

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The most commonly used explosives, for civil purposes, in construction and mining are Ammonium Nitrate Fuel Oil (ANFO) and explosive emulsions. Both are ammonium nitrate-based and detonate under the same chemical reaction between nitrate and mineral oil, given that the ANFO is composed of tiny grains of porous nitrate with diffused oil, and the emulsion is in the form of a liquid, continuous, viscous phase oily and the discontinuous aqueous phase. The study of parameters that measure explosive performance is fundamental to understanding the behavior of the explosion. Important parameters are the speed and pressure of detonation, the heat of the blast (energy), and the volume of gas produced. These properties help judge whether a particular explosive is convenient or not for the situation in question because, in some applications, high speed is required to increase the capacity of fragmentation, for example, when you want to fragment hard rocks. However, there is no need to fragment in some moments but to displace. Other properties, such as gas volume, become more relevant in such cases.

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“…A avaliação global de um sistema produtivo como a mineração pode resultar em redução de custos, aumento de produtividade e incremento na qualidade do produto, que dificilmente seriam alcançadas caso o sistema fosse examinado com uma visão fragmentada dos processos (MORAIS, 2004…”

Section: Introductionunclassified

“…Consequentemente, a fração de rocha que se rompe por tração ao longo das descontinuidades preexistentes é 1 -F c* . Graças aos diferentes mecanismos de ruptura, cada subconjunto de fragmentos de rochas deve ser representado como uma função distinta de distribuição granulométrica (MORAIS, 2004).…”

Section: Introductionunclassified