Micro-mechanical and micro-structural aspects of strength variation in rocks under various loading conditions

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Tarih

2015

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

TMMOB Maden Muhendisleri Odasi

Erişim Hakkı

info:eu-repo/semantics/closedAccess

Özet

This research focuses on the micro-mechanical and micro-structural aspects of strength variation in macro-scale rock structures, because final failure of rocks comes about through a process of interaction/coalescence among the many load-parallel or load-inclined tensile fractures that are generated by micro pre-existing cracks. Provide major contributions to the understanding of stress-induced micro-fracturing of rock under various loading conditions, static and dynamic, resulting in the degradation of macro-scale rock strength, or possibly strain-hardening, of rocks. The outcome of this research is expected to provide rock cutting, civil-geotechnical and mining design engineers with access to new, more accurate rock strength estimation methods, of high value for minimising the risks associated with rock strength uncertainty. A brittle rock type Brisbane tuff specimens were tested. Through the combined use of laboratory tests, Scanning Electron Microscope (SEM) techniques, and Computed Tomography (CT) scan technique, the damage mechanism of rocks under various loading conditions, including static and cyclic, were examined in nano-scale and the results were compared with each other for the first time in literature. Moreover, the sub-critical crack propagation phenomena , which is used to explain the premature failure of ceramics and metals and Fracture Process Zone (FPZ) phenomena, are explained in this research in terms of micro-mechanical strength reduction due to rock fatigue. Thus, modelling and understanding the crack propagation behaviour depending on different amplitude and frequencies are believed very important for the dynamic rock cutting researches and rock cutting machine manufacturers.

Açıklama

24th International Mining Congress of Turkey, IMCET 2015 -- 14 April 2015 through 17 April 2015 -- Antalya -- 112347

Anahtar Kelimeler

Damage mechanism, Micro-mechanical, Micro-structural, Rock strength

Kaynak

Proceedings of the 24th International Mining Congress of Turkey, IMCET 2015

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Scopus Q Değeri

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