Environmental Engineering Reference
In-Depth Information
The total length of this set of structures totals
around 2750 m in length, with foundations based
both directly and indirectly on the β 1 and β 2 vol-
canic complexes.
of the civil works constructed the following
could be emphasise, four anchored walls and three
retaining walls set on jet-grouting columns.
at the Terça Viaduct the depth of slope depos-
its ranged from about 3 m on the northern side to
14 m on the southern side. This accentuated dif-
ference implicated that this viaducts foundations
had to be mixed, with the northern abutment and
central pillar sated directly on footings while the
southern abutment was sated on pilings of about
15 m length.
in the western portal of the caniçal double Tun-
nel, the thickness of the slope deposits lead to the
construction of an anchored wall, with 65 m in
length and 7 m in height, at the top of the front
slope ( Fig. 4 ) .
it also allowed the resolution of situations
impossible to predict at initial stages and to carry
out the necessary design adjustments, in useful
time, as well as enabling an optimisation of human
and material resources and an increased reliability
of the constructed works.
acknoWleDGeMenTs
The authors are grateful to the Regional Direc-
torate of infrastructures and equipment of the
Regional Government of Madeira and to the
Tamega & Zagope & Tecnorocha & somague con-
struction consortium for the authorisation and
help provided.
ReFeRences
cenor & Grid. 2002-2003. Machico-Caniçal highway .
Final project (in Portuguese).
Pereira, a.F., Baião, c.J., Freitas, a.R., sousa, F.M., &
Brito, J.M., 2004. support structures and slope
consolidation at south Machico interchange of
Machico-caniçal highway in Madeira island. 9th
National Congress on Geothecnics; Proceedings. Coimbra
University. Coimbra. Portugal (in Portuguese) .
Rosa, s.P., Brito, J.M., & Baptista, J.P., 1995. Geological
and geotechnical conditions of Boa nova-cancela
stretch of Funchal-airport highway. 5th National
Congress on Geothecnics; Proceedings. Coimbra
University. Coimbra. Portugal (in Portuguese).
Rosa, s.P., Brito, J.M., & Baptista, J.P., 1997. Geological
and geotechnical conditions of civil works on new
highways of Madeira island eastern region. 6th
National
5
conclUsions
The extremely rough geomorphology of the zone
where this highway stretch was constructed,
together with the occurrence of deep slope depos-
its with stability conditions close to the limit equi-
librium, introduced substantial constraints to the
surveying and mechanical characterisation, as well
as to the establishment of basic criteria for the civil
works design.
These problems required an important devel-
opment of the geological and geotechnical stud-
ies, since the surveying phase, until the conclusion
of the civil works, as well as the involvement of a
multi-disciplinary group of technicians.
The technical support provided by geotechnical
experts revealed to be essential, enabling not only
the optimisation of the civil works design, but also
the improvement off the safety procedures, in the
light of the better understanding of the encoun-
tered conditions.
Congress
on
Geothecnics;
Proceedings.
LNEC. Lisboa. Portugal (in Portuguese).
Rosa, s.P., Brito, J.M., Baião, c.J., & Freitas, Rodrigues,
V.c., 2004. Geological and geotechnical conditions of
the Machico-caniçal highway. 9th National Congress
on Geothecnics; Proceedings. Coimbra University.
Coimbra. Portugal (in Portuguese) .
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