ANALIZA PARAMETRÓW SKURCZALNOŚCI GRUNTÓW SPOISTYCH WEDŁUG RÓŻNYCH NORM

Abstract

ANALYSIS OF CLAY SOILS SHRINKAGE PARAMETERS ACCORDING TO VARIOUS METHODS

Abstract. The article presents the results of shrinkage parameters research according to Polish standard PN-88/B-04481, British standard BS1377: Part 2: 1990: 6.3 and Krabbe’s equation from 1958 (Schultze, Muhs, 1967). Mio-Pliocene clays, glacial tills and alluvial soils were tested, as the most typical subsoils in Poland. Shrinkage limit w_s, volumetric shrinkage V_s, relative volumetric shrinkage V_p were determined and correlated with soils properties such as moisture content, shrinkage range, plasticity index and clay content. No significant relationships between shrinkage limit and clay content or plasticity index were found. Linear regression of high correlation coefficient was found between volumetric shrinkage V_s, V_p and moisture content, shrinkage range, plasticity index, clay content . However, the most important result of the analyses was the determination of the relationship between volumetric shrinkage V_p and moisture content (w₀) and plasticity index (I_p) – parameters commonly tested in geological engineering practice: V_p = 0,629w₀ + 0,191I_p–1,659 ± 3,166; (R = 0,968).