Fragmentation mechanism in crater blasting

Fourney, W.L.; Dick, Richard D.; Wang, X.J.; Wei, Yuan

doi:10.1016/0148-9062(93)91723-v

Cited by 54 publications

(24 citation statements)

References 2 publications

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“…More recently, finite element methods [4] have been applied to simulate wave propagation and spallation. Fourney et al [5] used a finite element method to study the fragmentation mechanism in carter blasting. They obtained the displacements of several points in the crater region which are in accord with the measured displacements.…”

Section: Introductionmentioning

confidence: 99%

A non-oscillatory method for spallation studies

Xiao

2006

Int. J. Numer. Meth. Engng

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SUMMARYThis paper introduces a non-oscillatory method, the finite element flux-corrected transport (FE-FCT) method for spallation studies. This method includes the implementation of a one-dimensional FCT algorithm into a total Lagrangian finite element method. Consequently, the FE-FCT method can efficiently eliminate fluctuations behind shock wave fronts without smearing them. In multidimensional simulations, the one-dimensional FCT algorithm is used on each grid line of the structured meshes to correct the corresponding component of nodal velocities separately. The requirement of structured meshes is satisfied by using an implicit function so that arbitrary boundaries of the simulated object can be described. In this paper, the proposed FE-FCT method is applied in spallation studies. Oneand two-dimensional examples show this non-oscillatory method could be one of the candidates to accurately predict spallation and the spall thickness.

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Section: Introductionmentioning

confidence: 99%

A non-oscillatory method for spallation studies

Xiao

2006

Int. J. Numer. Meth. Engng

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“…Dynamics of stress waves, such as stress wave propagation in solid media, reflection and transmittance at the solid boundary, is one of the fundamental research problems which are related to interesting applications in blasting (Fourney et al, 1993). Especially, fracture control in blasting is very important in underground excavation and demolition of concrete structures.…”

Section: Introductionmentioning

confidence: 99%

Visualization and numerical analysis of stress waves in blasting process

Matsumoto

Nakamura²,

Itoh

2003

J Vis

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Abs ract : Visualization studies were performed both experimentally and theoretically to observe stress wave propagation in a material and its interaction with the free surface of the material in a blasting process. PMMA (polymethyl-methacrylate) plates were used as a transparent material. The stress wave was generated by initiation of an electric detonator. The stress waves in the PMMA specimen with the right-angled corner were observed by means of the shadowgraph system using a Q switched ruby laser as a light source. In addition to the experiment, a numerical analysis using smoothed particle hydrodynamics (SPH) was also carried out to clarify the dynamic behavior of stress waves in the blasting process. Transmittance and reflection of the stress wave at the free surface could be visualized by both the experiment and the numerical analysis.t

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“…The surrounding rock types have also moderate influence on ground vibration as compared to blast design [7]. Besides, the geological discontinuity plays a important role in the transmission of ground vibration [8,9].…”

Section: Introductionmentioning

confidence: 99%

Blast-induced ground vibration management in deep open pit mines using GIS - A case study

Balamadeswaran¹,

Mishra²,

Sen³

et al. 2016

Proceedings of the Conference on Recent Advances in Rock Engineering (RARE 2016)

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Abstract-Blasting is considered to be one of the significant unit operations in the open pit mines for achieving higher production and productivity. As the blasting operation has been carried out frequently in deep open pit mines, the disturbance in the form of structural damages or psychological issues are also gradually exaggerated with increasing depth and change in the rock characteristics. Safety in terms of environmental effects is one of the significant aspects of a good blasting which can be accomplished possibly through advanced blasting practices and innovative approaches. Generally, the ground vibrations arising from the blasting operation is one of the fundamental reasons for creating unpleasant environmental issues for the mines situated near the population area or any sensitive structures. Similarly, the control of vibration is much helpful to deep open pit operators to achieve their operational objectives closer to the final limits such as wall control and sensitive infrastructure like crusher plant, shaft, buildings, pump house, pipelines and haul roads. Hence, prediction of the ground vibration components is very crucial for designing the safe blast. The intensity of the blastinduced ground vibration is affected by the parameters such as the physical and mechanical properties of the rock mass, characteristics of explosives and the blast design. Based on the plethora of research activity on the subject, different criteria have been designed to specify limits of blast-induced ground vibrations. In spite of the significant research, the criteria vary from one place to another and are not foolproof. This is primarily because of varied rock and blasting conditions. The rock characteristics can vary greatly from one part of a bench to another part, and also can have the directional variability according to discontinuities in the geological formation and structure. In this study, field measurements were carried out at the different benches of a deep open pit copper mine where dissimilar structural lithological characteristics exists and their results were analysed to evaluate blast-induced vibrations according to the type of rock formation. Finally, a thematic mapping indicating the blast-induced vibration level (ppv) for the different rock formations incorporating the structural geological features are prepared using Geographical Information System (GIS) technique. This thematic mapping can be used as effective tool in providing an interesting insight into the influence of rock characteristics on blast-induced vibration level while designing a blast in order to protect the pit slopes and surrounding structures in future.

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Fragmentation mechanism in crater blasting

Cited by 54 publications

References 2 publications

A non-oscillatory method for spallation studies

A non-oscillatory method for spallation studies

Visualization and numerical analysis of stress waves in blasting process

Blast-induced ground vibration management in deep open pit mines using GIS - A case study

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