Naslov
Influence of specimen shape deviations on uniaxial compressive strength of limestone and similar rocks

Autori
Štambuk Cvitanović, Nataša ; Nikolić, Mijo ; Ibrahimbegović, Adnan

Izvornik
International journal of rock mechanics and mining sciences (1365-1609) 80 (2015); 357-372

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
uniaxial compressive strength; intact rock core specimens; specimens shape deviations; shape tolerances; experimental investigation; numerical model
(uniaxial compressive strength; intact rock core specimens; specimens shape deviations; shape tolerances; experimental investigation; nNumerical model)

Sažetak
The results of experimental research program on ninety intact rock cylindrical test specimens are presented. The main goal is to examine the effect of typical specimens shape deviations (i.e. 'micro' deviations from flatness, parallelism of ends and specimen axis perpendicularity) on uniaxial compressive strength (UCS) for the limestone and similar rocks (rocks of similar or medium strength of approximately 100-150 MPa). The analysis of the results shows that in the case of the modern testing equipment there are no significant effects on the UCS value of neither parallelism nor axis perpendicularity for angle deviations up to 2. The new proposed tolerance for flatness of specimen end (expressed as total height of the surface profile) is 0.08 mm, to be used with the aim of optimization and control over the aforementioned influences of test specimens in further compressive testing. The experimental research results related to the UCS were further re-examined by recently proposed numerical model based on Embedded Discontinuity Finite Element Method (ED-FEM) which proves a reliable interpretation of complex 3D failure mechanisms. We show an excellent correlation between the experiments and our numerical results, as a further confirmation of our findings.

Izvorni jezik
Engleski

Znanstvena područja
Matematika, Građevinarstvo, Rudarstvo, nafta i geološko inženjerstvo

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