Environmental Engineering Reference
In-Depth Information
terms of geometry, thickness, jointing, weathering,
etc.) in these cases, classic methods for rock masses
characterization are ineffective, and detailed geo-
logical studies are the best way to define and evalu-
ate unstable zones on the slopes and to design the
most convenient stabilization methods.
ReFeRences
Blyth, F.G.h. & de Freitas, M.h. 1984. a Geology for
engineers. london: edgard arnold.
del Potro, R. & hürlimann, M. 2007. strength of vol-
canic rock masses in edifice instability: insights from
Teide, Tenerife. in a.M. Malheiro & J.c. nunes (eds),
Volcanic Rocks
: 175-184. london: Taylor & Francis
Group.
erichsen, c. 2002. Geotechnical models or classification
of the bedrock as a basis for the design and for the
construction of rock structures: 15-26. in c. Dinis da
Gama and l. Ribeiro e sousa (eds),
Workshop on vol-
canic rocks, Eurock 2002
, Funchal, 27 november, 2002.
González de Vallejo, l.i., hijazo, T., Ferrer, M. &
seisdedos, J. 2007. Geomechanical characterization
of volcanic materials in Tenerife. in a.M. Malheiro &
J.c. nunes (eds),
Volcanic Rocks
: 21-28. london:
Taylor & Francis Group.
kwasniewsky 2002. a note on the triaxial strenght on
volcanic rocks: 27-36. in c. Dinis da Gama and
l. Ribeiro e sousa (eds),
Workshop on volcanic
rocks, Eurock 2002
, Funchal, 27 november, 2002.
lomoschitz, a. 1996.
Caracterización geotécnica del ter-
reno, con ejemplos de Gran Canaria y Tenerife.
escuela
Técnica superior de arquitectura, Universidad de las
Palmas de Gran canaria.
Rodríguez-losada, J.a. hernández-Gutiérrez, l.e. olalla,
c. Perucho, a. serrano, a. & del Potro, R. et al. 2007a.
The volcanic rocks of the canary islands. Geotechnical
properties. in a.M. Malheiro & J.c. nunes (eds),
Vol-
canic Rocks
: 53-58. london: Taylor & Francis Group.
Rodríguez-losada, J.a., hernández-Gutiérrez, l.e.
lomoschitz, a. 2007b. Geotechnical features of
the welded ignimbrites of the canary islands. in
a.M. Malheiro & J.c. nunes (eds),
Volcanic Rocks
:
29-34. london: Taylor & Francis Group.
schmincke, h-U. 2004.
Volcanism
. Berlin: springer.
serrano, a., olalla, c. & Perucho, a. 2002. evaluation
of non-linear strength laws for volcanic agglomerates:
53-60. in c. Dinis da Gama and l. Ribeiro e sousa
(eds),
Workshop on volcanic rocks, EUROCK 2002
,
Funchal, 27 november, 2002.
serrano, a., olalla, c. & Perucho, a. 2008. estabilidad de
taludes en materiales heterogéneos.
II Jornadas Canar-
ias de Geotecnia, Tacoronte, Tenerife, 21-23 May 2008.
serrano, a., olalla, c., Perucho, a. & hernández-
Gutiérrez, l.e. 2007. strength and deformability of
low density pyroclasts: 35-44. in c. Dinis da Gama
and l. Ribeiro e sousa (eds),
Workshop on volcanic
rocks, EUROCK 2002
, Funchal, 27 november, 2002.
simic, D. 2007. Foundation of the “los Tilos” arch bridge
in la Palma island: 113-122. in c. Dinis da Gama and
l. Ribeiro e sousa (eds),
Workshop on volcanic rocks,
EUROCK 2002
, Funchal, 27 november, 2002.
Figure 7.
Designed footpath structure.
The cliff includes three groups of materials: (a)
irregular layers of basaltic breccia of scoria and
lapilli in the first one third part of the cliff wall; (b)
basaltic lava flows, massive and extensive, which
compound the upper two thirds of the cliff, and
(c) a number of volcanic dikes, of basaltic and tra-
chytic composition, that intrude the country rock.
all rocks correspond to the Miocene volcanic edi-
fice of Jandía.
it was done a geological and geomechanical
description of every material, which included an
evaluation of the bearing capacity at each support
however, along the shore there are many haz-
ardous zones for the project of the coast footpath:
- 2 zones afected by large landslides: the irst is
60 m long and 20 m high and has had big rock
topple and fall movements, and the second is
40 m long and 18 m high and has produced a
huge debris flow deposit on the shore platform.
- 7 potentially unstable zones at diferent points
of the cliff wall.
- 9 zones with caverns and caves at the base of the
cliff.
- 3 zones on the clif with a high degree of
erodibility.
every zone has been studied individually, hav-
ing searched a building solution for each one. For
instance: concrete buttresses and stone walls to sup-
port rock above caverns and caves; rock removal at
some places; concrete injection inside open joints;
tensioned rock bolts; reinforced cable net and bolts
on unstable rock wedges and columns, etc.
3
conclUsion
in many occasions, slopes on volcanic formations
do not follow homogeneous or simple patterns (in
