ANALIZA PARAMETRÓW SKURCZALNOŚCI GRUNTÓW SPOISTYCH WEDŁUG RÓŻNYCH NORM

Abstract

ANALYSIS OF CLAY SOILS SHRINKAGE PARAMETERS ACCORDING TO VARIOUS METHODSAbstract. 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 ws, volumetric shrinkage Vs, relative volumetric shrinkage Vp 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 Vs, Vp 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 Vp and moisture content (w0) and plasticity index (Ip) – parameters commonly tested in geological engineering practice: Vp = 0,629w0 + 0,191Ip–1,659 ± 3,166; (R = 0,968).