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Characterisation of weathered clayey soils responsible for shallow landslides
Nat. Hazards Earth Syst. Sci., 6, 825–838, 2006
/6/825/2006/
? Author(s) 2006. This work is licensed
under a Creative Commons License.
Natural Hazards
and Earth
System Sciences
Characterisation of weathered clayey soils responsible for shallow
landslides
C. Meisina
Department of Earth Sciences, Pavia, Italy
Received: 6 June 2006 – Revised: 10 August 2006 – Accepted: 4 September 2006 – Published: 25 September 2006
Abstract. Shallow earth translational slides and earth flows,
affecting colluvial soils derived by the weathering of the
clayey bedrock, are a recurrent problem causing damage to
buildings and roads in many areas of Apennines. The sus-
ceptibility assessment, e.g. slope stability models, requires
the preliminary characterization of these superficial covers
(lithology, geotechnical and hydraulic parameters).
The aim of the work is to develop and test a methodology
for the identification and mapping of weathered clayey soils
responsible for shallow landslides.
A test site in Northern Apennines (Province of Pavia) was
selected. Argillaceous and marly successions characterize
the area. Shallow landslides occurred periodically due to
high intensity rainfalls. Trench pits were used for the soil
profile description (lithology, structure, grade of weathering,
thickness) and sampling. The main geological, topographic
and geomorphologic parameters of shallow landslides were
analysed. Field surveys were integrated with some geotech-
nical laboratory tests (index properties, suction and volumet-
ric characteristic determination, methylene blue adsorption
test, linear shrinkage, swell strain).
Engineering geological zoning was carried out by group-
ing the superficial soils on the basis of the following at-
tributes: topographic conditions (slope angle), landslide oc-
currence, lithology (grain size), geometry (thickness), lithol-
ogy of the bedrock, hydrogeological and geotechnical char-
acteristics. The resulting engineering-geological units (areas
that may be regarde
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