19.05.2013 Views

Roca matriz, comport.mec.

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Factores que afectan al ensayo de<br />

compresión uniaxial<br />

b) Geometría de la probeta<br />

– forma:<br />

normalmente cilíndrica<br />

para evitar concentraciones:<br />

– caras paralelas y perpendiculares al eje (±0.001 rad =<br />

0.05 mm/50 mm)<br />

– sin irregularidades (< 0.3 mm)<br />

– relación altura – diámetro (ℓ/d)<br />

ℓ/d pequeño estado triaxial de tensiones<br />

ℓ/d grande pandeo<br />

normalmente, ℓ/d ≈ 2.5 a 3

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