Creep of granular clay is studied by one-step loading up to 1000 kPa in oedometers. Dry and loose specimens were used. Two phases of creep were found. The first one, up to 104 min., represents a regular secondary compression of semilogarithmic nature and is ascribed to the transformation of inborn fabric (produced by the specimen preparation) into the compression fabric. The other one is formed by a periodic variation of the s-creep and g-creep. S-creep is produced by the diffusion of the oedometric compression from the loaded plate downwards, g-creep results from the nonhomogeneity of the specimen. Granular clay is supposed to model waste clayey (double-porosity) material of open coal mines. Complexity of the creep process even in uniaxial compression points to the difficulty of numerically modelling of problematic soils.
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