Evaluation of rock mechanical behaviors under uniaxial compression with reference to assessed weathering grades
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
18/10/2012
18/10/2012
2009
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Resumo |
A weathering classification for granitic rock materials from southeastern Brazil was framed based on core characteristics. The classification was substantiated by a detailed petrographic study. Indirect assessment of weathering grades by density, ultrasonic and Schmidt hammer index tests was performed. Rebound values due to Schmidt hammer multiple impacts at one representative point were more efficient in predicting weathering grades than averaged single impact rebound values, P-wave velocities and densities. Uniaxial compression tests revealed that a large range of uniaxial compressive strength (214-153 MPa) exists in Grade I category where weathering does not seem to have played any role. It was concluded that variability in occurrences of quartz intragranular cracks and in biotite percentage, distribution and orientation might have played a key role in accelerating or decelerating the failure processes of the Grade I specimens. Deterioration of uniaxial compressive strength and elastic modulus and increase in Poisson`s ratio with increasing weathering intensity could be attributed to alteration of minerals, disruption of rock skeleton and microcrack augmentation. A crude relation between failure modes and weathering grades also emerged. Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) |
Identificador |
ROCK MECHANICS AND ROCK ENGINEERING, v.42, n.1, p.73-93, 2009 0723-2632 http://producao.usp.br/handle/BDPI/17907 10.1007/s00603-008-0170-2 |
Idioma(s) |
eng |
Publicador |
SPRINGER WIEN |
Relação |
Rock Mechanics and Rock Engineering |
Direitos |
restrictedAccess Copyright SPRINGER WIEN |
Palavras-Chave | #Weathering classification #granite #index tests #uniaxial compressive strength #Young`s modulus #Poisson`s ratio #failure modes #SCHMIDT HAMMER #HONG-KONG #MICROCRACKS #GRANITE #Engineering, Geological #Geosciences, Multidisciplinary |
Tipo |
article original article publishedVersion |