Universal criteria for rock brittleness estimation under triaxial compression

Analysis on brittleness characteristics of tight oil siltstones

“…According to the factors that the rock with the lower peak strain has a higher brittleness, the order about rock brittleness of the 5 samples from high to low is 96H-113-H, 21-T-1, 21-H, 113H-83-H, 21-T-2. On the basis of the previous brittleness index studies, we calculate the 6 different brittleness indicators. As is shown in Table 1, B1 (Rickman et al 2008) and B2 (Guo et al 2015) are proposed according to Young's modulus (E) and Poisson's ratio (υ), B3 (Altindag, 2010) is a brittleness indicator which consider the post-peak stress state, and B4, B5 (Tarasov and Potvin, 2013) and B6 (Xia et al 2016) consider both pre-peak and post-peak state of the complete stress-strain curves. It is shown in Figure 2 that B2 of the 5 samples is consistent with the conclusions from the figure 1.…”

“…The brittleness indexes were also established by Rickman et al (2008), Guo et al (2013) and Liu et al (2015) based on the Young's modulus (E) and Poisson's ratio (υ). Some other researchers (Altindag, 2010;Tarasov and Potvin, 2013;Xia et al, 2016) evaluated the rock brittleness characteristics from the perspective of the rock failure strength, strain, and energy. However, there is no unified or standard evaluation criterion for rock brittleness in the academic and industrial communities.…”

A step towards combating rockburst damage by using sacrificial support

“…According to the scale, the index value k 1 = 0 indicates absolute brittleness, whereas k 1 = 1 (E = M) on the other hand also represents absolute brittleness. The positive slope of the postpeak curve shows that the rock exhibits Class II behaviour, and rocks in this class are generally brittle (Tarasov and Potvin, 2013). This is evident in the complete stress-strain curve inserted above the brittleness index scale.…”

“…According to Tarasov and Potvin (2013), the brittleness of rock material dictates its ability to violently release the elastic strain energy stored within the rock. In the laboratory, this can be tested by conducting servo-controlled tests.…”

Experimental Research on Energy Release Characteristics of Water-Bearing Sandstone Alongshore Wharf

“…J. P. Zuo et al analyzed the stress drop of rock specimens in post-peak range from energy view, the coefficient of energydrop was presented to discuss the variation of rock failure from brittle to ductile and the confining pressure effect on it [13]. B. Tarasov and Y. Potvin estimated rock brittleness based on the elastic energy accumulated and released within the loaded specimen and analyzed the confining pressure effect on rock brittleness [14]. W. Sukplum investigated the mechanical deformation properties of sandstone with cyclic loading in uniaxial and triaxial compression tests, and they found that the confining pressure has a significant effect on deformation, higher confining pressure results in larger strains [19].…”