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Lab Report

Decent Essays

There is considerable interest in predicting the permeability arising from the detonation of explosives emplaced in low permeability geological formations. These predictions would be useful for applications such as hydrogeology (Sarbhukan, 1990), massive explosive stimulation of tight gas reservoirs (Li and Xue, 2000), shale gas formations (Guo et al, 2014), coal gasification (Zhu et al, 2013), stimulation of geothermal reservoirs (Austin et al, 1973), and fracturing oil shale with explosives (Miller and Johansen, 1976). It is well known that energy released during blasting causes damage in the surrounding rocks in the form of micro to macro cracks, which increases the permeability of rocks. It is therefore of prime importance in reservoir …show more content…

Sometimes certain physical characteristics related to explosion cannot be scaled to practical experimental set up.
On the other hand, computational methods have been broadly applied to study blast-induced fractures in rocks. The finite element method (FEM) (Zhu et al. 2008), discrete element method (DEM) (Potyondy et al. 1996), combined finite-discrete element method (FEM-DEM) (Trivino and Mohanty, 2015), combined discrete element method-smoothed particle hydrodynamics (DEM-SPH) (Fakhimi and Lanari, 2015) and combined finite element method-smoothed particle hydrodynamics (FEM-SPH) method (Gharehdash et al, 2016) have been successfully adopted to investigate the blasting-induced fracture patterns in rocks. The approaches hold promise for this class of rock fracture problems. Numerical predictions of these methods could provide useful knowledge for blast induced fracture problems. However, dealing with the large deformation and post-failure is generally a difficult task for FEM since this method is a grid-based technique. It thus suffers from grid distortions, which lead to inaccuracies in the solution or even to failure of the computation. DEM simulation does not have that limitation; however, specification of DEM parameters is somewhat ambiguous, and reliable guidelines have not yet been clearly established. Combined FEM-DEM, DEM-SPH and FEM-SPH

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