Abstract
Rock Dilatancy in Uniaxial Tests A procedure to find an elastic/viscoplastic constitutive equation able to describe rock dilatancy in uniaxial unconfined creep tests is given starting from experimental data. The influence of the loading rate on the rock dilatancy can also be described with this model. It is shown that a creep of the volume takes place during tests and that this volume creep has the following property: the volume strain is oscillating before ariving at its final stable value. This property is described by the proposed mathematical model using a variable viscosity coefficient which may change sign. According to the model the volume creep takes place during loading only.
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