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The paper deals with the at-rest earth pressure coefficient K0NC and Poisson's ratio ν prediction for normally consolidated soils based on the connection between the effective friction angle φ′ and its mobilized proportion φ′mob in the process of one-dimensional compression. After considering the existing correlations between these two parameters, the comparison with experimental data leads to both the validation of the existing theoretical K0NC equation coming from the BRICK model and the proposal of an equivalent empirical K0NC equation, derived without any assumptions. The same connection between φ′ and φ′mob leads to interesting correlations, one theoretical and one empirical, between φ′ and ν for normally consolidated soils. No laboratory data in terms of pairs (φ′,ν) have been found at all in literature, and, therefore, experimental validation of these correlations is necessary.
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