New weathering classifications for granitic rocks based on geomechanical parameters

Petrographic features as an effective indicator for the variation in strength of granites

“…7.5). The relationship of alteration degree with void space and dry density of the studied samples is depicted in Figure 7.6, which emphasis the higher degree of alteration of MG. Heidari et al (2013) described the classification of granitic rocks from western Iran on the basis of degree of weathering using different physical and mechanical properties including porosity, tensile strength, ultrasonic velocities etc. According to these classifications, MG samples exhibit higher alteration grade due to higher voids spaces, lower tensile strength and lower p-wave velocity than other studied granites (Table 7. (Table 7.4).…”

“…Various physical and mechanical properties of rocks including ultrasonic velocity, porosity, uniaxial and tensile strength and point load index are used for weathering classification by Heidari et al (2013). Simple regression analysis of properties against each other were used to describe the classification diagrams (e.g.…”

On the reliability of the strength retention ratio for estimating the strength of weathered rocks

“…Although R s has become a popular tool to classify the degree of weathering of granitic rocks (Heidari et al, 2013;Momeni et al, 2015) and rock mass (Ramamurthy, 2004), there are still some concerns regarding its use. In particular, a) the value of R s strongly depends on the strength of fresh rocks.…”

Saprolitologia aplicada à gênese e às implicações ambientais de regolitos do Estado de Pernambuco

“…(5) os mecanismos de dissolução, reprecipitação e formação de pseudomorfos durante o intemperismo das rochas e (6) a influência da temperatura sobre a taxa de alteração do feldspato (VELBEL, 1983(VELBEL, , 1986(VELBEL, , 1988VELBEL;LONG;GOODING, 1991;VELBEL;BASSO;ZIEG, 1996 4. Classificação estrutural de saprolitos: (NORBURY et al, 1995;RAO, 1998RAO, , 2001ARIKAN;ULUSAY;AYDIN, 2007;GOKCEOGLU et al, 2009;NASERI, 2013;MOMENI et al, 2015 Amsterdam,v. 35, n. 4, p. 559-567, 1984a.…”

“…Mesmo oficialmente inexistente, a saprolitologia pode ser implicitamente encontrada em estudos publicados em todo o mundo (BECKER, 1895;BAKER, 1994;NORBURY et al, 1995;BRAND;BUTT, 2001;BUTT, 2010;NASERI, 2013;MOMENI et al, 2015), inclusive em estudos desenvolvidos na região Nordeste do Brasil (JACOMINE et al, 1973;ARAÚJO FILHO;CARVALHO, 1996;JACOMINE, 1996;BÉTARD, 2012).…”