Towards New Swedish Recommendations for Cautious Perimeter Blasting

Ouchterlony, Finn; Olsson, Mats; Bergqvist, I.

doi:10.1076/frag.6.2.235.8666

Cited by 19 publications

(8 citation statements)

References 4 publications

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“…where γ is an isotropic exponent for a specific explosive (1.254-2.154), ρ 0 denotes the explosive density, D stands for VOD, and d e /d h represents the ratio of explosive diameter to borehole diameter called the decoupling ratio. Later, Ouchterlony et al [68] provided the following correction coefficients to improve the given method:…”

Section: Svebefo Modelmentioning

confidence: 99%

Estimation of Damage Induced by Single-Hole Rock Blasting: A Review on Analytical, Numerical, and Experimental Solutions

et al. 2020

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This paper presents a review of the existing models for the estimation of explosion-induced crushed and cracked zones. The control of these zones is of utmost importance in the rock explosion design, since it aims at optimizing the fragmentation and, as a result, minimizing the fine grain production and recovery cycle. Moreover, this optimization can reduce the damage beyond the set border and align the excavation plan with the geometric design. The models are categorized into three groups based on the approach, i.e., analytical, numerical, and experimental approaches, and for each group, the relevant studies are classified and presented in a comprehensive manner. More specifically, in the analytical methods, the assumptions and results are described and discussed in order to provide a useful reference to judge the applicability of each model. Considering the numerical models, all commonly-used algorithms along with the simulation details and the influential parameters are reported and discussed. Finally, considering the experimental models, the emphasis is given here on presenting the most practical and widely employed laboratory models. The empirical equations derived from the models and their applications are examined in detail. In the Discussion section, the most common methods are selected and used to estimate the damage size of 13 case study problems. The results are then utilized to compare the accuracy and applicability of each selected method. Furthermore, the probabilistic analysis of the explosion-induced failure is reviewed using several structural reliability models. The selection, classification, and discussion of the models presented in this paper can be used as a reference in real engineering projects.

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Section: Svebefo Modelmentioning

confidence: 99%

Estimation of Damage Induced by Single-Hole Rock Blasting: A Review on Analytical, Numerical, and Experimental Solutions

et al. 2020

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“…Zhang derived the analytical expressions for the crushed zone generated by two charge forms based on the theory of explosion shock wave and suggested that the size of the crushed zone was related to the initial charge radius [7]. Holmberg and Persson [8], Ouchterlony [9], Kanchibolta et al [10], and Ouchterlony et al [11] predicted the size of the broken area by a semiempirical formula that is broadly used in engineering fields. However, this formula is utilized for quantitative analysis with poor accuracy and cannot distinguish the types of geotechnical media.…”

Section: Introductionmentioning

confidence: 99%

The Comparative Study on the Damage Zones of Cylindrical and Spherical Charges in Rock and Soil

Wang

2021

Shock and Vibration

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To compare the damage zones of spherical and cylindrical charges in rock and soil, a quasistatic spherical model was established to predict the characteristic dimension of the cavity. The results indicated that the damage zones of cylindrical charges were larger than those of spherical charges. Furthermore, the cavity development of two charges with different shapes was obtained by numerical simulation, and a comparison of the prediction results between the quasistatic model and numerical simulation was made. The comparison showed that the model could predict the damage zones exactly and faster than numerical simulation. Ultimately, the influence of explosions and soil media was discussed by the quasistatic model. It was observed that larger damage zones were generated by smaller values of the product of pressure and exponential expansion. However, the influence of soil media was complex, and larger damage zones were usually generated by the harder soil media.

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“…Detonation of explosive induces tension cracks in the rock and depending on the quality of the blasting pattern, these cracks are more or less long and may have an impact on stability and support load. Many researchers have been investigating this problem and nowadays there are a number of reports and models available (Kwon, et al, 2009;Torbica and Lapčević, 2016;Ouchterlony, et al, 2002;Hustrulid and Lu, 2002).…”

Section: Introductionmentioning

confidence: 99%

Rock fracturing mechanisms by blasting

Torbica

Lapčević

2018

Podzemni radovi

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Optimizing blast fragmentation and reducing the damage from it are two important research subjects in this field. Detonation and explosive charge induces three sets of tension cracks in the monolith rock. Radial tension cracks are formed under the influence of the pressure wave whose cylindrical propagation induces tension. Along with the explanation of how radial cracks are formed, formulation is given as to how their length can be calculated using laboratory and drill and blast parameters. Cracks subparallel with the free surface (face) are related with amounts of absorbed and recoverable strain energies. The distance between subsequent cracks can be calculated using the results of simple load-unload laboratory tests. Third sets of tension cracks are formed as a result of excessive deformation of the beam or cantilever formed by radial cracks. Once the length of the cracks and the distance between them are known, it is possible to apply these results for estimation of fragment sizes and blasting pattern design.

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Towards New Swedish Recommendations for Cautious Perimeter Blasting

Cited by 19 publications

References 4 publications

Estimation of Damage Induced by Single-Hole Rock Blasting: A Review on Analytical, Numerical, and Experimental Solutions

Estimation of Damage Induced by Single-Hole Rock Blasting: A Review on Analytical, Numerical, and Experimental Solutions

The Comparative Study on the Damage Zones of Cylindrical and Spherical Charges in Rock and Soil

Rock fracturing mechanisms by blasting

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