Numerical modelling of fragmentation by blasting and gravity flow in sublevel caving mines

Yi, Changping; Johansson, Daniel; Wimmer, Matthias; Nordqvist, Anders; Miguel, Carlota Rodriguez San

doi:10.36487/acg_repo/2205_66

Cited by 4 publications

(6 citation statements)

References 5 publications

(5 reference statements)

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Section: Explosive and Stemming Materials Modelsmentioning

confidence: 99%

“…A high explosive burn (HEB) material card was used to simulate the detonation of the explosives. The input values for JWL EOS and HEB for an emulsion material are provided in Table 2 [35]. Stemming is a material used to prevent the release of detonation gases by filling the remaining areas in the blast hole, and it helps the pressure generated by the explosives to crush the rock efficiently.…”

Section: Explosive and Stemming Materials Modelsmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of the Blasting Efficiency of a Long and Large-Diameter Uncharged Hole Boring Method in Tunnel Blasting Using 3D Numerical Analysis

Kim

Song

et al. 2022

Sustainability

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Cut blasting is one of the most essential processes to reduce blast-induced vibration in tunnel blasting. The long and large-diameter uncharged hole boring (LLB) method is an example of one of the cut blasting methods, which utilizes large-diameter uncharged holes drilled in the tunnel face. In this study, blasting simulations were performed to analyze its blasting mechanism, and the LLB method and the traditional burn-cut method were simulated to compare their blasting efficiency. A 3D numerical analysis using LS-DYNA code, a highly non-linear transient dynamic finite element analysis using explicit time integration, was used to simulate the blasting process, and a Johnson–Holmquist constitutive material model, which is optimal for simulating brittle materials under dynamic conditions, was used to simulate the rock behavior under blasting. The modified LLB method showed a 3.75-fold increase in the advance per round compared to the burn-cut method, due to the increased formation of long and large-diameter uncharged holes compared to blast holes. This modified LLB method used 30% less explosives, so its failure range was approximately 1.25 times less than that of the burn-cut method, but its advance was approximately 4 times larger than the burn-cut method, which was similar to the original LLB method. This confirmed that the modified LLB method is significantly more efficient in terms of increased blasting efficiency (particularly the advance per round) as well as reduced blast-induced vibration, compared to the traditional cut blasting method.

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Section: Explosive and Stemming Materials Modelsmentioning

confidence: 99%

Section: Explosive and Stemming Materials Modelsmentioning

confidence: 99%

Assessment of the Blasting Efficiency of a Long and Large-Diameter Uncharged Hole Boring Method in Tunnel Blasting Using 3D Numerical Analysis

Kim

Song

et al. 2022

Sustainability

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“…The Yade code was employed to investigate the influence of caved rock mass friction on gravity flow formation in sublevel caving mines [22]. Both fragmentation by blasting and gravity flow of SLC was modeled in one model using the LS-DYNA code [23].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Gravity Flow in Sublevel Caving Based on Polyhedron DEM

Yi,

Johansson,

Wimmer

et al. 2023

Mining, Metallurgy & Exploration

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The gravity flow behavior of blasted ore and caved waste in sublevel caving (SLC) mines is complex. The shape of fragmented ore and caved waste is identified as one of the principal factors influencing the gravity flow of ore. To investigate the effect of the particle shapes on the gravity flow, a code was developed to generate polyhedral fragments in different shapes and divide them into internal elements. Then these fragments were imported in the LS-DYNA code to generate SLC models containing blasted ore and caved waste and model the extraction process. To model the non-continuous loading process, the gravity flow was considered to be an intermittent process by setting a switcher at the extraction point. The flow behavior of ore from the numerical modeling is in agreement with the experimental results. The cumulative dilution of ore by waste is up to around 30%, which agrees with the results of the field survey.

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“…Blasting and HE interactions with rock or other brittle materials are challenging but important topics of research. Numerous experimental and numerical studies of varying scales have been conducted to understand these complicated phenomena including blasting and material [1][2][3][4][5][6][7][8][9]. However, large-scale and field tests are relatively costly and difficult to conduct.…”

Section: Introductionmentioning

confidence: 99%

“…HE material properties of the HEB model with the JWL EOS Detonation energy per unit volume*, E 0 2.718 J/mm3 …”

mentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Baranowski

Kucewicz

Pytlik

et al. 2022

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A study of dolomite rock material failure using a simple small-scale blast setup is presented. Laboratory tests were conducted using disc specimens drilled with a borehole in the center. A detonation cord and a blasting cap were fitted inside the borehole to induce cracking and fracturing of the specimens. The specimens were inserted between two steel plates, which were compressed against the specimen using bolt screws. Prior to testing, the most suitable screw torque for constraining the vertical displacement of the specimen surfaces without compressing the specimen was selected based on numerical simulations. Then, the experimental tests with the blasting cap were simulated using the Johnson-Holmquist II (JH-2) material model, and the properties of the blasting cap were determined and verified in two special tests with a lead specimen. Possessing the validated model, the influence of specimen thickness on the cracking patterns was finally analyzed. This paper presents a relatively easy method for studying rock material behavior under blast loading and for validating the numerical and constitutive models used for rock simulations.

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Numerical modelling of fragmentation by blasting and gravity flow in sublevel caving mines

Cited by 4 publications

References 5 publications

Assessment of the Blasting Efficiency of a Long and Large-Diameter Uncharged Hole Boring Method in Tunnel Blasting Using 3D Numerical Analysis

Assessment of the Blasting Efficiency of a Long and Large-Diameter Uncharged Hole Boring Method in Tunnel Blasting Using 3D Numerical Analysis

Numerical Simulation of Gravity Flow in Sublevel Caving Based on Polyhedron DEM

Bulletin of the Polish Academy of Sciences: Technical Sciences

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