Stiffness parameters defined from “rough” in situ tests in relation to “noble” reference values on saprolitic soils from granite
DOI:
https://doi.org/10.14195/2184-8394_106_1Abstract
The bonded structure and fabric of residual saprolitic soils from granite has significant influence on their geomechanical behaviour. Typical profiles of Porto urban area have been intensely studied, with extensive in situ testing which included SPT, CPT, DP, PMT, CH (seismic tests) and PLT (under different loading areas). The identification of stiffness properties for geotechnical design based on such field testing methods is much dependent on several factors, from which the strain level will be focused in this paper. The structural particularities of these residual soils influence their pattern of non-linear constitutive behaviour. Deformability moduli derived from robust but relatively “rough” tests (such as SPT, CPT, DP or even PMT) are compared with reference values taken from seismic survey (CH) and load tests (such as PLT) and are situated in the corresponding stress-strain levels defined from laboratory triaxial tests over high quality undisturbed samples.
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