التفاصيل البيبلوغرافية
| العنوان: |
Modelling of Bottom Air-Deck Blasting in a Single Hole, Using the SPH–FEM Method. |
| المؤلفون: |
Moradi, Mehrdad, Mansouri, Hamid, Ebrahimi Farsangi, Mohamad Ali, Saffari Pour, Mohsen |
| المصدر: |
Geotechnical & Geological Engineering; Aug2024, Vol. 42 Issue 6, p4891-4911, 21p |
| مصطلحات موضوعية: |
BLASTING, BLAST waves, SHOCK waves, TIME pressure |
| مستخلص: |
Experimental and analytical researches have shown that the use of the bottom air-deck blasting improves fragmentation and reduces toe problems. In this research modelling of bottom air-deck blasting in a single hole, using numerical methods was taken into account. Considering the advantages of the Smoothed Particle Hydrodynamics (SPH) method, this method was used for modelling. In order to reduce the runtime of the process, the SPH–FEM coupled method was applied, using LS-DYNA software. To validate the modelling, the results of an experimental modelling of a single blast hole, in Barre granite was used. The results have shown that at the start of detonation, as the first free face is the bottom air-deck, hence, the blasting shock wave and explosive products move toward the air-deck area at a speed of 2.5 km/s and pressure on the wall of the blast hole in the air-deck area is more than the one at the starting point of detonation. Also, in conventional blasting, initial induced pressures are more than ones induced by air-deck blasting, but regarding the high attenuation of waves in conventional blasting, the applying time of pressures is very small. In bottom air-deck blasting, although the level of initial pressures are low, however, multiple impacts of blast waves in the air-deck area can transform compressive stress to tensile stress and produce higher and longer duration waves. These phenomena can contribute to an increase in the creation of fractures and improve the fragmentation at the bottom of the blast hole. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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