Shear lab tests to determine residual shear strength of overconsolidated clays
DOI:
https://doi.org/10.24849/j.geot.2020.150.03Keywords:
residual shear strength, overconsolidated clays, shear lab testsAbstract
During landslides of overconsolidated clay soils, the strength that really acts in discontinuities, shear zones, fissures, and clay reorientation zones is the residual shear strength. The strength parameters achieved through different shear strength lab tests and by means of back analysis, considered to be the most reliable value along the failure surface, are compared in this research. Thus, the lab test that can be used to provide the strength values more similar to the ones obtained by back-analysis is ascertained. Thanks to the high effective stresses applied in the tests, a new range of brittleness indexes of the material studied is included. Additionally, an alternative ring shear test procedure is proposed, combining the methods proposed
in the European (EN ISO 17892-10:2018), British (BS 1377-7:1990) and north American (ASTM D6467-
06a:2006) standards
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