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AN INVESTIGATION ON THE EFFECTS OF MICRO-PARAMETERS ON THE STRENGTH PROPERTIES OF ROCK
- Source :
- Rudarsko-geološko-naftni zbornik, Volume 36, Issue 1, Rudarsko-geološko-naftni Zbornik, Vol 36, Iss 1, Pp 111-119 (2021)
- Publication Year :
- 2021
- Publisher :
- Faculty of Mining, Geology and Petroleum Engineering University of Zagreb, 2021.
-
Abstract
- Rocks are formed from particles and the interaction between those particles controls the behaviour of a rock’s mechanical properties. Since it is very important to conduct extensive studies about the relationship between the micro-parameters and macro-parameters of rock, this paper investigates the effects of some micro-parameters on strength properties and the behaviour of cracks in rock. This is carried out by using numerical simulation of an extensive series of Uniaxial Compressive Strength (UCS) and Brazilian Tensile Strength (BTS) tests. The micro-parameters included the particles’ contact modulus, the contact stiff ness ratio, bond cohesion, bond tensile strength, the friction coefficient and the friction angle, and the mechanical properties of chromite rock have been considered as base values of the investigation. Based on the obtained results, it was found that the most important micro-parameters on the behaviour of rock in the compressive state are bond cohesion, bond tensile strength, and the friction coefficient. Also, the bond tensile strength showed the largest effect under tensile conditions. The micro-parameter of bond tensile strength increased the rock tensile strength (up to 5 times), minimized destructive cracks and increased the corresponding strain (almost 2.5 times) during critical stress.<br />Svaka je stijena stvorena od čestica čijim se međudjelovanjem određuju njezina mehanička svojstva. Budući da je vrlo važno provesti opsežne studije o povezanosti mikroparametara i makroparametara stijene, u ovome su radu istraživani učinci nekih mikroparametara na svojstva čvrstoće i ponašanje pukotina stijene numeričkim simulacijama jednoosne tlačne čvrstoće (UCS) i brazilske vlačne čvrstoće (BTS). Ispitivani mikroparametri uključivali su kontakt čestica, omjer kontaktne krutosti, koheziju veze, vlačnu čvrstoću, koeficijent trenja i kut trenja, a mehanička svojstva stijene bogate kromitom bile su osnovne vrijednosti ispitivanih mikroparametara. Utvrđeno je kako su najvažniji mikroparametri na ponašanje stijene kod tlačenja kohezija veze, vlačna čvrstoća veze i koeficijent trenja. Također, vlačna čvrstoća ima najveći učinak u vlačnim uvjetima. Ovaj mikroparametar povećava vlačnu čvrstoću (do 5 puta), minimalizira destruktivne pukotine i povećava odgovarajuće naprezanje (gotovo 2,5 puta) pri kritičnome naprezanju.
- Subjects :
- lcsh:TN1-997
Materials science
Critical stress
crack
Modulus
destructive crack
Friction angle
Ultimate tensile strength
medicine
Cohesion (geology)
micro-parameter
Composite material
Micro-parameter
rock
bond strength
uniaxial compressive strength (UCS)
Brazilian tensile strength (BTS)
lcsh:Mining engineering. Metallurgy
Water Science and Technology
Bond strength
lcsh:QE1-996.5
Mikroparametar
stijena
pukotina
snaga veze
jednoosna tlačna čvrstoća
brazilska vlačna čvrstoća
destruktivna pukotina
Stiffness
Geology
Geotechnical Engineering and Engineering Geology
brazilian tensile strength (bts)
lcsh:Geology
General Energy
Compressive strength
uniaxial compressive strength (ucs)
General Earth and Planetary Sciences
medicine.symptom
Subjects
Details
- Language :
- English
- ISSN :
- 18490409 and 03534529
- Volume :
- 36
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Rudarsko-geološko-naftni zbornik
- Accession number :
- edsair.doi.dedup.....f84ae6cc8a6c06ef2d6c7f3cb2b88342