Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of Different Filling Media Between Explosive and Blast-Hole Wall on Rock Blasting
https://orcid.org/0000-0002-9218-3902
Abstract Filling medium between explosive and blast-hole wall has significant impact on the rock blasting result. In this study, four types of filling media were adopted: gas (air), solid (sand), liquid (water), and solid–liquid mixed (sand and water). We established three-dimensional reconstruction model of a “rock-explosion crack” subjected to explosion in different filling media, accurately describe the location and shape spatial distribution of an explosion crack. By combining this with fractal theory, we obtained the fractal dimension and degree of explosion-crack damage in rock material. When solid–liquid state was used as the filling medium, the explosion-crack density was highest. When air was used as the filling medium, the explosion-crack density was the lowest. Radial explosion cracks ran through the entire blast-hole area, whereas tangential cracks were concentrated in the charge area. A conical explosive crack angle formed at the borehole bottom and increased as the filling medium changed from gaseous state to solid–liquid mixed state. The volume-fractal dimension of the rock sample and degree of damage to the internal fracture network was determined. The fractal dimensions of the explosion cracks tended to increase, and the corresponding degree of damage gradually increased. The three-dimensional degree of damage with solid–liquid state as the filling medium increased by 44.3% compared to that of the air as filling medium. A numerical simulation was conducted to analyze the explosion energy transfer efficiencies of air, sand, and water. When water was used as the filling medium, the total energy received and the energy-accumulation rate were the highest. The total energy accumulated by an explosion was 2.36 and 1.18 times that of air and sand, respectively.
Highlights Highlights In this study, four types of filling media were adopted: gas (air), solid (sand), liquid (water), and solid–liquid mixed (sand and water). We established three-dimensional reconstruction model of a “rock-explosion crack” subjected to explosion in different filling media, accurately describe the location and shape spatial distribution of an explosion crack. Obtained the fractal dimension and degree of explosion-crack damage in rock material. When solid–liquid state was used as the filling medium, the explosion-crack density was highest. A conical explosive crack angle formed at the borehole bottom and increased as the filling medium changed from gaseous state to solid–liquid mixed state. When water was used as the filling medium, the total energy received and the energy accumulation rate were the highest. The total energy accumulated by an explosion was 2.36 and 1.18 times that of air and sand.
Effect of Different Filling Media Between Explosive and Blast-Hole Wall on Rock Blasting
https://orcid.org/0000-0002-9218-3902
Abstract Filling medium between explosive and blast-hole wall has significant impact on the rock blasting result. In this study, four types of filling media were adopted: gas (air), solid (sand), liquid (water), and solid–liquid mixed (sand and water). We established three-dimensional reconstruction model of a “rock-explosion crack” subjected to explosion in different filling media, accurately describe the location and shape spatial distribution of an explosion crack. By combining this with fractal theory, we obtained the fractal dimension and degree of explosion-crack damage in rock material. When solid–liquid state was used as the filling medium, the explosion-crack density was highest. When air was used as the filling medium, the explosion-crack density was the lowest. Radial explosion cracks ran through the entire blast-hole area, whereas tangential cracks were concentrated in the charge area. A conical explosive crack angle formed at the borehole bottom and increased as the filling medium changed from gaseous state to solid–liquid mixed state. The volume-fractal dimension of the rock sample and degree of damage to the internal fracture network was determined. The fractal dimensions of the explosion cracks tended to increase, and the corresponding degree of damage gradually increased. The three-dimensional degree of damage with solid–liquid state as the filling medium increased by 44.3% compared to that of the air as filling medium. A numerical simulation was conducted to analyze the explosion energy transfer efficiencies of air, sand, and water. When water was used as the filling medium, the total energy received and the energy-accumulation rate were the highest. The total energy accumulated by an explosion was 2.36 and 1.18 times that of air and sand, respectively.
Highlights Highlights In this study, four types of filling media were adopted: gas (air), solid (sand), liquid (water), and solid–liquid mixed (sand and water). We established three-dimensional reconstruction model of a “rock-explosion crack” subjected to explosion in different filling media, accurately describe the location and shape spatial distribution of an explosion crack. Obtained the fractal dimension and degree of explosion-crack damage in rock material. When solid–liquid state was used as the filling medium, the explosion-crack density was highest. A conical explosive crack angle formed at the borehole bottom and increased as the filling medium changed from gaseous state to solid–liquid mixed state. When water was used as the filling medium, the total energy received and the energy accumulation rate were the highest. The total energy accumulated by an explosion was 2.36 and 1.18 times that of air and sand.
Effect of Different Filling Media Between Explosive and Blast-Hole Wall on Rock Blasting
https://orcid.org/0000-0002-9218-3902
Abstract Filling medium between explosive and blast-hole wall has significant impact on the rock blasting result. In this study, four types of filling media were adopted: gas (air), solid (sand), liquid (water), and solid–liquid mixed (sand and water). We established three-dimensional reconstruction model of a “rock-explosion crack” subjected to explosion in different filling media, accurately describe the location and shape spatial distribution of an explosion crack. By combining this with fractal theory, we obtained the fractal dimension and degree of explosion-crack damage in rock material. When solid–liquid state was used as the filling medium, the explosion-crack density was highest. When air was used as the filling medium, the explosion-crack density was the lowest. Radial explosion cracks ran through the entire blast-hole area, whereas tangential cracks were concentrated in the charge area. A conical explosive crack angle formed at the borehole bottom and increased as the filling medium changed from gaseous state to solid–liquid mixed state. The volume-fractal dimension of the rock sample and degree of damage to the internal fracture network was determined. The fractal dimensions of the explosion cracks tended to increase, and the corresponding degree of damage gradually increased. The three-dimensional degree of damage with solid–liquid state as the filling medium increased by 44.3% compared to that of the air as filling medium. A numerical simulation was conducted to analyze the explosion energy transfer efficiencies of air, sand, and water. When water was used as the filling medium, the total energy received and the energy-accumulation rate were the highest. The total energy accumulated by an explosion was 2.36 and 1.18 times that of air and sand, respectively.
Highlights Highlights In this study, four types of filling media were adopted: gas (air), solid (sand), liquid (water), and solid–liquid mixed (sand and water). We established three-dimensional reconstruction model of a “rock-explosion crack” subjected to explosion in different filling media, accurately describe the location and shape spatial distribution of an explosion crack. Obtained the fractal dimension and degree of explosion-crack damage in rock material. When solid–liquid state was used as the filling medium, the explosion-crack density was highest. A conical explosive crack angle formed at the borehole bottom and increased as the filling medium changed from gaseous state to solid–liquid mixed state. When water was used as the filling medium, the total energy received and the energy accumulation rate were the highest. The total energy accumulated by an explosion was 2.36 and 1.18 times that of air and sand.
Effect of Different Filling Media Between Explosive and Blast-Hole Wall on Rock Blasting
Zuo, Jinjing (Autor:in) / Yang, Renshu (Autor:in) / Gong, Min (Autor:in) / Ge, Fengyuan (Autor:in)
2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
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