elastic material.3.1.2 Volumetric ResponseDrained and undrained responseA key feature of the response of?uid-in?ltrated porousmaterial is the di?erence between undrained and drained deformation. These two modes ofresponse represent limiting behaviors of the material: the undrained response characterizes thecondition where the?uid is trapped in the porous solid such thatζ=0, while the drainedresponse corresponds to zero pore pressurep=0?.?H0andR0were originally denoted asHandRin Biot’s 1941 paper.4Since the same symbols were laterrede?ned,18the prime superscripts have been added here to avoid any confusion; see Appendix A.?For the time being, the drained conditions will be assumed to correspond top=0; this can however berelaxed to include any initial pore pressure?eldthatisinequilibrium.9
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