Physical and mechanical characterization of phyllites and metagreywackes in central Portugal

Lithologic control on soil texture heterogeneity

“…The geotechnical characterization of phyllites and metagreywackes of the studied region was provided by Andrade and Saraiva (2010). The characterization of the weathering properties of the regional granites can be found in Sequeira Braga et al (2002).…”

Geological - geotechnical characterization of different lithotypes in an underground mine

“…The DORO's data were the most homogeneous and those from the BXD the most dispersed. Leão (2017) analyzing phyllites with different degrees of alteration in the region of Ouro Preto / Minas Gerais State found mean Is 50 values ranging from 0.2 to 1.15 Andrade and Saraiva (2010) reported values between 0.6 and 3.9 MPa for Is 50 of phyllites in the central region of Portugal. The phyllite samples analyzed in the present study presented values slightly higher than those obtained by these authors.…”

“…Nogueira (2000) obtained for two types of phyllites, sericitic and dolomitic, from the region of Quadrilátero Ferrífero, values of longitudinal wave speed from 2484 to 4122 m/s and 4806 to 6753 m/s, respectively. Andrade and Saraiva (2010), have obtained values between 1530 and 5323 m/s. Quinta-Ferreira et al, (2015), in a study of a phyllite in Vila Velha de Rodão, also in Portugal, obtained a mean wave propagation velocity of 1657 m/s.…”

“…Nogueira 2000obtained, for two types of different phyllites, sericitic and dolomitic, from the region of Quadrilátero Ferrífero, values of UCS strength in a range between 10.4 to 33.7 MPa and 100.0 to 294.8 MPa, respectively. Andrade and Saraiva (2010), studying physical and mechanical characteristics of phyllites in the central region of Portugal, has obtained UCS strength values between 24.0 and 52.2 MPa. However, Quinta-Ferreira et al, (2015), study-ing a phyllite also in Portugal, found that an average UCS strength equal to 38.9 MPa.…”

Mikaşistlerin deformabilite, modül oranı ve anizotropik davranışlarının belirlenmesi; Burgaz baraj sahasından (İzmir-Türkiye) örnek bir çalışma

“…In this work, loading was vertically applied on the core specimens with different schistosity plane orientations (α = 0 -3°, α = 28°-30°, and α = 90°). In addition, the relationship between UCS and sonic wave velocity was investigated previously in the literature for various rock types (Mc Cann et al, 1990in Entwisle et al, 2005Gupta and Seshagiri Rao, 1998;Sharma and Singh 2008;Andrade and Saraiva 2010). In this paper, a large number of ultrasonic pulse velocity tests were conducted on the micaschist intact core specimens obtained from ASK-1 borehole drilled in the Burgaz dam site.…”