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A micro-structured continuum modelling compacting fluid-saturated grounds: the effects of pore-size scale parameter. Acta Mechanica, Springer Verlag, 1998, pp.18. A micro-structured continuum modelling compacting fluid-saturated grounds: the effects of pore-size scale parameter F. dell'Isola and L. Rosa, Rome, Italy, and C. Wo~niak, Warsaw, Poland (Received May 10, 1996; revised September 20, 1996) Summary. The effect of a "pore-size" length-scale parameter 1 on compaction of grounds with fluid inclusions is studied. They are modelled as continua endowed with micro-structure by means of the macro-modelling procedure proposed in [2]. We show the dependence of field evolution equations on the micro-structure parameter l and compare our model with the homogenized asymptotic ones. The consideration of the pore size 1 allows us to forecast the onset of micro-displacement waves as a consequence of a ground settling and to suggest a possible description of the genesis of certain microearthquakes [5] [6].

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