Geoscience Reference
In-Depth Information
Displacement Monitoring at Verrand
High Reinforced Soil Structure
G. Sembenelli and P. Sembenelli
SC Sembenelli Consulting, Milan, Italy
1 INTRODUCTION
The Verrand high reinforced soil structure (HRSS) was built within the
construction works for a new highway, which will connect the Monte Bianco
tunnel with the city of Aosta, in the Italian Alps. The first aim of the
structure was providing a stabilizing weight at the toe of a 35
steep
and unstable slope, which forms the left bank of the Dora River. About 10m
above the top of the stabilizing embankment, a shaft foundation of a 30-m-
high pier will be placed. The pier is one of the four supports of a 600-m-long
bridge.
Additional purposes of the Verrand RSS were the disposal for about
120,000 m
3
of material from nearby tunnel excavations and providing access to
construction fronts beyond the embankment.
The slope is basically formed by a glacial till, which can be described
as a silty sand matrix containing gravel and large boulders. The glacial till
is overconsolidated and slightly cemented. Both effects vanish within the
surficial part of the mass, so that the slope can be considered close to
limit conditions. The water table daylights about 10m above the toe of the
slope.
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