Digital image based numerical micromechanics of geocomposites with application to chemical grouting

0444238 - ÚGN 2016 RIV GB eng J - Journal Article
Blaheta, Radim - Kohut, Roman - Kolcun, Alexej - Souček, Kamil - Staš, Lubomír - Vavro, Leona
Digital image based numerical micromechanics of geocomposites with application to chemical grouting.
International Journal of Rock Mechanics and Mining Sciences. Roč. 77, July 2015 (2015), s. 77-88. ISSN 1365-1609. E-ISSN 1873-4545
R&D Projects: GA ČR(CZ) GA105/09/1830; GA MŠMT ED1.1.00/02.0070
Institutional support: RVO:68145535
Keywords : geocomposites * upscaling * digital CT image based FEM * identification of material parameters
Subject RIV: DB - Geology ; Mineralogy
Impact factor: 2.010, year: 2015
https://www.sciencedirect.com/science/article/pii/S1365160915000623?via%3Dihub

The presented paper describes procedures of numerical upscaling and experience with X-ray CT based finite element (FEM) analysis of properties of geocomposites. The upscaling technique is used for obtaining the macro-level response of material by loading test (representative) volumes with described micro-level structure. The application is focused on geocomposites arising from chemical grouting of coal substances. The obtained (homogenized) macro-level properties serve for solving stability problems by numerical modeling in geotechnical engineering. The paper touches several interacting topics – numerical upscaling and understanding to its results; application of X-ray computed tomography (CT) for visualization of structure of geomaterials; processing the digital image data for constructing FEM models of test volumes; numerical testing of digitalized samples for obtaining homogenized properties and clearing up sensitivity to changes in local material properties, micro-level structure and FE mesh; validation of numerical results by comparison with laboratory testing of samples; use of identification technique for refining the local material properties and calibration of the upscaling procedure.
Permanent Link: http://hdl.handle.net/11104/0246805