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Experimental and model data of aggregate compaction by pressure solution

Cite as:

van den Ende, Martijn (2017): Experimental and model data of aggregate compaction by pressure solution. GFZ Data Services. http://doi.org/10.5880/fidgeo.2017.018

Status

I   N       R   E   V   I   E   W : van den Ende, Martijn (2017): Experimental and model data of aggregate compaction by pressure solution. GFZ Data Services. http://doi.org/10.5880/fidgeo.2017.018

Abstract

Intergranular pressure solution creep is an important deformation mechanism in the Earth’s crust. The phenomenon has been frequently studied and several analytical models have been proposed that describe its constitutive behavior. These models require assumptions regarding the geometry of the aggregate and the grain size distribution in order to solve for the contact stresses, and often neglect shear tractions. Furthermore, analytical models tend to overestimate experimental compaction rates at low porosities, an observation for which the underlying mechanisms remain to be elucidated.

Here we present a conceptually simple, 3D Discrete Element Method (DEM) approach for simulating intergranular pressure solution creep that explicitly models individual grains, relaxing many of the assumptions that are required by analytical models. The DEM model is validated against experiments by direct comparison of macroscopic sample compaction rates. Furthermore, the sensitivity of the overall DEM compaction rate to the grain size and applied stress is tested. The effects of the interparticle friction and of a distributed grain size on macroscopic strain rates are subsequently investigated.

Overall, we find that the DEM model is capable of reproducing realistic compaction behavior, and that the strain rates produced by the model are in good agreement with uniaxial compaction experiments. Characteristic features, such as the dependence of the strain rate on grain size and applied stress, as predicted by analytical models, are also observed in the simulations. DEM results show that interparticle friction and a distributed grain size affect the compaction rates by less than half an order of magnitude.
The zip-file Van-den-Ende_2017.018.zip contains several folders with raw data from the laboratory experiments, output data from Discrete Element Method simulations, and Python 2.7 script files that read and process these data. All data are stored in ASCII format.

Contact

Contributors

Experimental rock deformation/HPT-lab

Keywords

Compaction, Pressure solution, Discrete Element Method, Halite, Granular mechanics, EPOS, multi-scale laboratories, rock and melt physical properties, Strain gauge > Axial strain gauge, Strength > Uniaxial Compressive Strength, Thermocouple, Uniaxial, fault_related_material, salt

GCMD Science Keywords

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        • Dataset_Title: Experimental and model data of aggregate compaction by pressure solution
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      • Summary
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License

CC BY 4.0

Dataset Description

Supplement to