Soil shear strength in earth works - some concepts and definitions
DOI:
https://doi.org/10.24849/j.geot.2015.133.08Keywords:
Shear strength, Cohesion intercept, Undrained shear strength, Drained and undrained behaviourAbstract
The shear strength in earth works is approached with the Mohr-Coulomb model and with the critical state concepts. Drained and undrained analyses are considered in the response of a soil to loading taking into consideration the build-up and dissipation of pore water pressure. The cohesion intercept c′ is discussed in the context of volume change and particle aggregation. The Hvorslev parameters are presented. Some results of the granite saprolite from Guarda are shown. The undrained shear resistance cu for cohesive soils, which permits an undrained behaviour, is considered and debated. The laboratory and field evaluation of the undrained shear strength is discussed and some empirical and deduced relations are put forward in function of the index soil parameters. The normalized behaviour is presented for the soft soils from the alluvia of river Mondego, obtained from a laboratory triaxial test program using reconstituted samples.
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