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.
Highlights
One of the most important factors that affects the behaviour of rocks is their mechanical properties, such as compressive and tensile 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
The aim of this paper is to investigate the effects of micro-parameters on strength properties and micro-crack behaviour of rock materials
Summary
One of the most important factors that affects the behaviour of rocks is their mechanical properties, such as compressive and tensile properties. These properties, which play a dominant role in the mechanism of rock failure, usually attract special attention in rock engineering projects. Crack density and propagation show a significant impact on the behaviour and strength properties of rocks. The mechanical behaviour of rock materials is controlled by the grain aggregate and the cementation (bond) between the grains (Delenne et al, 2011; Gao and Kang, 2017; Bahaaddini and Rahimi, 2018; Bahaaddini et al, 2019). A few researchers have studied the relations of these mechanical properties of rocks (Huang, 1999; Yang et al, 2006; Xu et al, 2016; Bahaaddini and Rahimi, 2018; Yari and Bagherpour, 2018a; Yari and Bagherpour, 2018b; Yari et al, 2019; Khoshouei et al, 2020), more studies are required to
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