PĘCZNIENIE MIOPLIOCEŃSKICH IŁÓW SERII POZNAŃSKIEJ Z REJONU BYDGOSZCZY NA TLE ICH LITOLOGII

Abstract

SWELLING OF MIO-PLIOCENE CLAYS FROM THE REGION OF BYDGOSZCZ IN COMPARISON TO THEIR LITHOLOGYAbstract. The article presents the characteristics of expansive features of Mio-Pliocene clays from the area of Bydgoszcz on the basis of selected pits. Determination of basic lithological and genetic features such as grain-size and mineralogy, specifi c surface, the composition of exchangeable cations in the natural complex of absorbent and microstructure was carried out. Physical properties compared with statistical values from the area of Bydgoszcz were presented. Expansive features i.e. swelling index and swelling pressure were presented in relation to initial moisture content and bulk density within the range of variation of these parameters in the subsoil, controlled by natural climatic and biotic factors. The results were commented in relation to deformations in expansive massive observed in Bydgoszcz.