DBPapers
DOI: 10.5593/SGEM2014/B12/S2.111

SUFFOSION HAZARD FOR BUILDING AND INFRASTRUCTURE IN THE HIGH LOMBARDY PLAIN (NORTHERN ITALY)

L. Colombo, V. Francani, P. Gattinoni
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-08-7 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 2, 869-876 pp

ABSTRACT
Suffosion is a geological hazard in which soils particles are removed by groundwater flow or chemicals-typical dissolution processes. The voids enlargement involved in the phenomenon brings about a wide range of landforms (i.e. caves, subsidence hallows, collapse sinks, swallow holes). These suffosional features are well known to be dangerous for infrastructures and buildings, both during their construction and life-time. In the present paper a description of suffosion features is given with reference to a case study in the Upper Lombardy Plain, where detailed surveys were carried out in order to design an important road infrastructure. The results of in situ surveys (SPT, geoelectrical tomographies, drillings) are discussed in order to make out caves and voids distribution in the study area, to define indexes useful for detecting their presence, and finally to quantify the effects of the phenomenon on structure design.

Keywords: geophysical survey, geological hazard, SPT, suffosion