EEMSKIE GYTIE I KREDA JEZIORNA Z WARSZAWY JAKO PRZYKŁAD „MOCNYCH” GRUNTÓW ORGANICZNYCH

Abstract

EEMIAN GYTTJA AND LACUSTRINE CHALK FROM WARSAW AS AN EXAMPLE OF “HARD” ORGANIC SOILSAbstract. Gyttja and lacustrine chalk are commonly considered as soft soils, inappropriate as a subsoil of buildings. This opinion concerns „young” Holocene sediments characterized by low values of strength parameters and large compressibility. The Eemian age and preconsolidation processes of Warsaw gyttja and lacustrine chalk caused that tested soils behave like mineral sediments. The analysis of selected geotechnical parameters presented in the paper is based on author’s field investigations and laboratory tests supported by archival data from documentary works. The collected results locate calcareous sediments from “Żoliborz glacial tunnel valley” away from “soft” organic sediments and allow to treat them like “harder” subsoil for engineering constructions.