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Type: Conference paper
Title: Distinct element modeling of coupled chemo-mechanical compaction of rock salt
Author: Min, Ki-Bok
Niemeijer, A.
Elsworth, Derek
Marone, C.
Citation: Euro-conference of Rock Physics and thermo-hydro-mechanical processes in rocks / Ettore Majorana Foundation and Centre for Scientific Culture, 25–30 September, 2007: pp.45-46
Issue Date: 2007
Conference Name: Euro-conference of Rock Physics and thermo-hydro-mechanical processes in rocks (29th : 2007 : Erice, Italy)
School/Discipline: School of Civil, Environmental and Mining Engineering
Abstract: The chemically-mediated compaction of rock salt is represented as a problem in granular mechanics using a distinct element model. The model follows the motion of the interacting particles by combining conservation of momentum with a contact law between particles, which accounts for the time dependent closure due to pressure solution via a viscous resistance (Fig.1a for verification). Attributes of the model are explored through a variety of studies to explore the effect of packing, (i.e., regular versus random packing), and size distribution of granular particles. The results show that random packing, which is typically the case for natural compaction, allows for significantly larger pressure solution-induced viscoelastic displacement than regular packing, a frequently-used generic model for pressure solution, due mainly to the increased contact areas between particles (Fig.1b). A range of diameter distributions of the particles tested to investigate the dependency on size distribution show that size distribution is an important factor in inducing and triggering pressure solution. The code is used to explore effects apparent in laboratory experiments on granular mixtures of salt, in which pressure solution is known to operate at rapid rates under room temperature conditions. The rock salt was crushed and sieved to obtain 6 grain size fraction ranging from 38 – 212 μm to investigate the effects of grain size and grain size distribution. The experiments were performed in a steel pressure vessel inside a biaxial loading frame under both constant stress and constant strain (stress relaxation) conditions with controlled pore pressure and confining pressure.
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Appears in Collections:Civil and Environmental Engineering publications

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