Theories of soil mechanics were concerned with calculating soil loads on masonry retaining walls. Both the cohesive and non-cohesive soils require determinations of soil behavior in the conditions of application of compression strengths, cutting deformation, shear, and penetration. For the Soil Science, mainly for soil survey, has been elaborated in the course of the year 1980, 2003 and 2012 the new Romanian Taxonomy Soil System (SRTS), which are similar with the World Reference Base for Soil resources (WRB), 2014, but not identic. In accordance with SRTS-2012, Vertisols class comprises soil with shrinkage - swelling properties (z), which are manifested from the first 25 cm pending above to 100 cm, and contain ≥ 45% clay. There are two soil types in this class: Vertosol and Pelosol, both of them with z horizon – shrinking and swelling and a vertic horizon, Bzy, namely Vertosol but also Pelosol. For a better identification of the two soil types from the Vertisols Class, respectively Vertosol and Pelosol, the present thesis proposes some rheological indices. we have selected only these indexes which don't need special equipment: Free swelling (UL), (vertic horizon >140%, pelic horizon 100 - 140%); Plastic index, (Ip), (Ip=25-45 pellic horizon, Ip≥45 vertic horizon); lower plastic limit (wp); indexes: volume contraction, Cv, (Cv = 75 - 100 – pellic horizon, Cv > 100 – vertic horizon); activity index, IA, (IA 1,00 – 1,25 – pellic horizon, IA > 1,25 – vertic horizon).

smectites, slickenside, Vertisols, Rheological index

agronomy

Presentation: poster