Two-dimensional dynamic finite element simulation of rock blasting
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ORIGINAL PAPER
Two-dimensional dynamic finite element simulation of rock blasting M Sazid & T N Singh
Received: 10 May 2012 / Accepted: 12 July 2012 # Saudi Society for Geosciences 2012
Abstract In the present study, the two-dimensional blast model has been simulated using finite element software Abaqus/CAE. The John–Wilkins–Lee equation of state has been used to calculate the pressure caused by the release of the chemical energy of the explosive. Detonation point from center of hole has been defined for the traveling path of explosive energy. Elastoplastic dynamic failure constitutive with kinematic hardening model was adopted for rock mass responses under high explosive pressure to understand the mechanism of blast phenomena. In this model, it is assumed that failure of rock occurs under tensile failure when yield plastic stress exceeded to its static tensile strength. The hydrostatic pressure was used as a failure measure to model dynamic spall or a pressure cut off. Variation of detonation velocity has been measured in terms of simulation blast output energies index results. Keywords Finite element method . Abaqus . Rock blasting
Introduction Application of blasting to breakage of rock mass and overburden is increasing day by day due to the faster rate of tunneling, mining, and other civil construction work worldwide. Explosives are the key source of concentrated chemical energy for either breaking the rock or displacing the rock mass for various uses. Performance and efficiency of explosive energy can be assessed by various modes like vibration measurement, fragmentation, rock movement, etc. (Sanchidrian et al. 2007). The performance of explosive M. Sazid (*) : T. N. Singh Department of Earth Sciences, Indian Institute of Technology-Mumbai, Mumbai 400076, India e-mail: [email protected]
and to control its effect, various precautionary measures have been taken by users, but it is still not clear about the internal changes in the phenomena. The large-scale experimentation in the field may not be feasible due to various uncontrolled parameters as well as time consumed to understand the mechanism. The fast computational tools which can be able to simulate the real-time phenomena attract many researchers to resolve the complicated and complex phenomena like blasting (Yang et al. 1996; Liu and Katsabanis 1998; Taylor et al. 1986; Paine and Please 1994). This will certainly improve the understanding of mechanism which is not available by any other means. Blasting creates number of problems in the surrounding area if not properly designed and executed. Numerical simulation can provide basic understanding to increase the effective and efficient use of explosive energy for better fragmentation and to control the damage to surroundings. If fragmentation is better, then replacement by many other side effect of the blast abuse like ground vibration, fly rock, back breaks, etc. can be minimize simultaneously (Monjezi et al. 2011; Monjezi et al. 2012). Numerical simulations can be of great help for better understandin
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