An advanced assessment of mechanical fracture parameters of sandstones depending on the internal rock texture features

0503886 - ÚGN 2020 RIV CZ eng J - Journal Article
Vavro, Leona - Malíková, L. - Frantík, P. - Kubeš, P. - Keršner, Z. - Vavro, Martin
An advanced assessment of mechanical fracture parameters of sandstones depending on the internal rock texture features.
Acta geodynamica et geomaterialia. Roč. 16, č. 2 (2019), s. 157-168. ISSN 1214-9705. E-ISSN 2336-4351
R&D Projects: GA MŠMT(CZ) LO1406
Institutional support: RVO:68145535
Keywords : sandstone * mode I fracture toughness * bending Young's modulus * fracture energy * load–displacement diagram
OECD category: Mechanical engineering
Impact factor: 1.227, year: 2019
Method of publishing: Open access
https://www.irsm.cas.cz/materialy/acta_content/2019_doi/Vavro_AGG_2019_0013.pdf

In this paper, sandstones from three Czech localities were subjected to mechanical fracture testsin order to obtain their properties. Carboniferous sandstone from the Staříč site was primarilydifferent from the two other Cretaceous sandstones from Podhorní Újezd and Javorka localitiesin the type of grain contact, as well as in their mineralogical composition of the rock matrix andcement. These differences were primarily reflected in different rock porosities. An advancedassessment of the fracture response of the chevron notch specimens made of sandstonessubjected to three-point bending test was carried out by means of the GTDiPS programsuggested for processing the loading diagrams. Bending Young's modulus, mode I fracturetoughness and fracture energy were subsequently calculated for all tested sandstone samples.Obtained outcomes show that the sandstone from the Staříč mine exhibits several times highervalues of investigated properties than the Podhorní Újezd and Javorka sandstones. This wasa result of a higher degree of rock compaction, siliciferous rock cement and, therefore, relativelylow total porosity. Internal rock texture and mineralogical composition of matrix or cement arethus one of the most important factors influencing the values of mechanical fracture parametersof sandstones.
Permanent Link: http://hdl.handle.net/11104/0295655