Some existing experimental data on the uniaxial compressive strength of porous rocks have been re-examined in relation to the suction of the specimens. It is shown that from pF 0 to pF 5 the rock strength is little affected but from pF 5 to pF 7 the strength depends markedly on suction. It is suggested that at low moisture contents, suction contributes to rock strength in a similar way to its well known contribution to soil strength.

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