Preface of the special issue on 'poromechanics in honour of Arnold Verruijt'. (4th August 2015) - de Borst, René; Borja, Ronaldo; Darve, Félix; Pijaudier‐Cabot, Gilles; Whittle, Andrew; de Borst, R.; Borja, R. I.; Darve, F.; Pijaudier‐Cabot, G.; Whittle, A. J.