Modelling of Soil Behaviour with Hypoplasticity by David Mašín

Author:David Mašín
Language: eng
Format: epub
ISBN: 9783030039769
Publisher: Springer International Publishing

Parameter : Parameter specifies the position of the theoretical isotropic normal compression line. In clays, this line may easily be determined experimentally using isotropic compression experiments. In granular soils, however, its direct experimental investigation is difficult, as the initial void ratio is typically below and the state converges towards -line very slowly during isotropic compression. In fact, -line is a theoretical limit of the maximum void ratio corresponding to the loosest assembly of grains in the gravity-free space (for its determination using the discrete element method, see [9]). An empirical equation for was investigated by Herle and Gudehus [2], who studied idealised packing of spherical particles at a state of minimum density (Fig. 5.9). They proposed the following empirical relationship for , which is recommended for calibration:

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