Issue 42

M. Davydova et alii, Frattura ed Integrità Strutturale, 42 (2017) 170-180; DOI: 10.3221/IGF-ESIS.42.18 170 Fragmentation of Mansurov granite under quasi-static compression Marina Davydova, Ivan Panteleev, Oleg Naimark Institute of Continuous Media Mechanics Ural Branch Russian Academy of Sciences 1, Ac. Korolev str., Perm 614013, Russia. http://lab13.icmm.ru/index.php/en/ 1957davydova@gmail.com, pia@icmm.ru, naimark@icmm.ru A BSTRACT . The fragmentation statistics was studied in the quasi-static compression experiments conducted on prismatic specimens of Mansurov granite. The statistical analysis showed that the cumulative fragment mass distribution for granite specimens is well described by a power law function, but the fragment number-sieve size distribution deviates from the power law in the range of are equal to about 1 mm. In order to explain this fact, we investigated the structure of fractured material (Computed Tomography and microstructures study in thin sections). A sharp increase the number of grains in the range of size from to 0.5 mm to 1 mm and a change in the fragment shape (from splinter to oval) allow us to suppose that there is an addition fracture mechanism associated with disintegration of feldspar and amphiboles grains. K EYWORDS . Fragmentation statistics; Granite fracture; Power law distribution. Citation: Davydova, M., Panteleev, I., Naimark, O., Fragmentation of Mansurov granite under quasi-static compression, Frattura ed Integrità Strutturale, 42 (2017) 170-180. Received: 25.06.2016 Accepted: 12.08.2017 Published: 01.10.2017 Copyright: © 2017 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION ragmentation plays an important role in a variety of geological phenomena, which is the main is due to the fact that rock fragmentation involves the initiation and propagation of fracture, and interaction between defects (pores, cracks) over a wide range of scales [1]. There exist many works devoted to different types and aspects of rock fragmentation. This phenomenon has been discussed by Grady [2,3]. Bowman [4] used the concepts introduced by Grady to study the dynamic fragmentation of rock during rock avalanches. Apart from the studies of natural process, there are many investigations on rock fracture under dynamic and quasi-static loading in laboratory conditions. A variety of methods and techniques are used to gain a complete understanding of the fracture mechanisms in rock: acoustic emission [5,6], fractolumiscence [7-9], digital image correlation [6,10], image analysis [11], electromagnetic emission [9,12-15] and nuclear emission [16,17]. In this work, along with the definition of fragmentation statistics laws, we study the granite structure of fragmented sample by using: X-ray Computed Tomography (CT), petrography–analysis of rocks in thin section, granulometric analysis and imaging particle analysis. F