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  • 1.
    Petropoulos, Nikolaos
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Beyglou, Ali
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Johansson, Daniel
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Nyberg, Ulf
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Novikov, Evgeny
    Boliden Mineral AB.
    Fragmentation by blasting through precise initiation: Full scale trials at the Aitik Copper mine2014In: Blasting and Fragmentation, ISSN 1937-6359, Vol. 8, no 2, p. 87-100Article in journal (Refereed)
    Abstract [en]

    Fragmentation is an important factor for improving downstream processes in mine operations. Six trials have been conducted at the Aitik copper mine to investigate the effect of ultra-short inter-hole delay times, i.e. smaller than 1 ms/m of burden, on fragmentation. Swelling, MWD data and crusher efficiency were also evaluated for trials. According to the results, the effect of examined short inter-hole delay times, i.e. 0.14 to 0.86 ms/m of burden, on fragmentation was found to be marginal. Delay time of 0.43 ms/m of burden resulted in slightly finer fragmentation and larger swell; however, the effect of short delays was overshadowed by the effect of small variations in specific charge.

  • 2. Tesarik, D.R.
    et al.
    Hustrulid, W.A.
    Nyberg, Ulf
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Assessment and application of a single-charge blast test at the Kiruna mine, Sweden2011In: Blasting and Fragmentation, ISSN 1937-6359, Vol. 5, no 1, p. 47-72Article in journal (Refereed)
    Abstract [sv]

    Partikelhastighet (PPV) och avståndsmätningar utförda av svenska forskare presenteras för enskottsladdningar i järnmalm i Kiruna gruvan i norra Sverige. De används tillsammans med teoretiska PPV-värden som beräknats med hjälp av en formel baserad på hydrodynamik för att bestämma skadornas omfattning orsakas av en enda laddning. Denna ekvation, som relaterar PPV till explosiva egenskaper, laddningsgeometri och avstånd från en laddning, tillämpades sedan på en laddning av olika geometri som användes i ortdrivning. En jämförelse mellan beräknade och uppmätta PPV tyder på att strosshålen sannolikt skada läget för hjälparhålen, och att hjälparhålen ger skador där konturhålen sitter. Den praktiska konsekvensen är att typiska skadeberäkningar baserade på mätningar utförda i oskadat berg är konservativa. Detta tyder på att även när begränsningar av sprängskador inte tillämpas för drivning (dvs konturhålen är fulladdade), kan den resulterande skadan bli mindre än förväntat på grund av den vågdämpande effekten som det förspräckta berget utgör. På grund av den dämpande effekten, kommer dålig kontroll av kontursprängning att till vis del vara sälvkorrigerande. Det måste dock starkt betonas att väl en utvecklad utformning av sprängning med kontroll av konturen är mycket fördelaktig i förhållande till både ekonomiska och säkerhetsmässiga aspekter.

  • 3.
    Yi, Changping
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Johansson, Daniel
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Nyberg, Ulf
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Numerical modelling on short delay blast-induced fragmentation and vibration2018In: Blasting and Fragmentation, ISSN 1937-6359, Vol. 12, no 2, p. 105-116Article in journal (Refereed)
    Abstract [en]

    Blasting operations can fragment rock mass into smaller pieces and meanwhile induce vibration anddamage in remaining rock mass. A series of small-scale laboratory tests were carried out to investigatethe effects of short delay times on fragmentation. These tests were modeled using a coupledFEM-BPM-PBM model in the LS-DYNA code. In the model, the remaining rock is representedby a finite element model (FEM) and the rock to be blasted is represented by a bonded particlemodel (BPM). The detonation of explosives is described with a particle blast method (PBM). Thefragment size distribution was obtained with a code developed in Perl programming language. Theblast-induced vibration and damage in the remaining rock mass were evaluated. The results showthat the coupled FEM-BPM-PBM model can be employed to evaluate both fragmentation in theblasted domain and the blast-induced damage and vibration in the remaining rock mass.

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