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Preservation of slope stability along the by-pass Vlora
Maintien de la stabilité des pentes dans le contournement de « vlora »
Bozo L.
POLIS University
Allkja S.
ALTEA& GEOSTODIO 2000 Shpk
ABSTRACT
:
The development of the tourism in Albania is a very profitable branch of the economy. For this reason we have
request to construct much new roads. One of them is the road to Jonian sea side which is with rarely beautiful nature. In this
zone has constructed much restaurants, hotels, touristic resorts, but the access to them is difficult because the low quality of
the existing roads. In these conditions is decided construction of the by-pass Vlora, and we have accomplished the geological
and geotechnical study along the track of the new road. By this study we have in evidence : a) all dangerous phenomena’s
which can appear during the construction of the road, b) the sites where the road will passes by viaducts and bridges, c) the
zones where the road will passes by cuts, d) the zones where the road will passes by embankments. In this paper we would
like to present our study about the road’s section which passes by cuts in hills terrain. By in situ tests and laboratory tests we
have determined the kind of cuts, their geometrical forms in manner to protect environment and stability of slopes. Also we
have take some classifications of cuts in this road regarding real conditions of the terrain.
RESUME: Le tourisme en Albanie est l’une des activités les plus profitable pour l’économie du pays. Afin d’en accélérer le
développement, le pays à souhaiter construire un grand nombre de nouvelles routes. L’une d’entre elle est la route qui
conduit au littoral de Jonian, site naturel d’une grande beauté. Dans cette zone ont été construits beaucoup d’hôtels, de
restaurants et des stations touristiques. Malheureusement, l’accès au site de Jonian est difficile à cause des routes de qualité
médiocres. Aussi, a été décidé la construction du coutournement de “Vlora” et à cette occasion, de nombreuses études
géologique et géotechnique ont été effectué. Grace à ces études in-situ, nous avons pu a) détecter les phénomènes dangereux
qui sont susceptibles d’apparaitre pendant de la construction de la route, b) identifier les sites où la construction de la route
Allait induire la construction de viaducs et de ponts, c) les zones des excavations seraient nécessaires, d) les zones où des
remblais devraient être édifier. Dans cet article, nous souhaitons présenter notre étude sur la portion de route pour laquelle
des excavations ont été réalisées. Par le biais d’essais in-situ et d’essais de laboratoire, nous avons pu dimensionner les
excavations à effectuer en tenant compte de la problématique de la stabilité des talus.
KEYWORDS: cutting, slope, stability, geological study, geotechnical study, environment, classification.
1. INTRODUCTION
The new road “By-pass Vlora” passes in the hill’s and
mountain’s zones, which intersects several small streams
and rivers. In the 29 km of their length 80% of the road
passes in cutting and 20% in embankment. The hills of
east part of the city Vlora are longitudinal of the direction
of the Vlora By-pass. These hills are built from
sedimentary rocks and they form steep rocky slopes. The
soft slopes of these hills are transformed into agricultural
lands, while the deep slopes are covertures with small
trees. The intention of the study is the determination of
the physical and mechanical properties of the soils and
rocks encountered in the area where will passes the new
road. The data taken from field and laboratory works will
be useful to made the detailed road project for
embankments, cutting, new bridges, or viaducts etc. Also
from geological and geotechnical study can judge for the
dangerous phenomena’s which can appear during the
construction and exploitation of road and for the
selection of the construction material. These properties
are determined by specimens from bore-holes, trial pits,
refraction seismic tests, field tests, and laboratory tests.
We wont to present in our study the following problems:
The evidence of the dangerous phenomena’s for the road
and environment.
Determination of the physical and mechanical properties
of the soils and rocks in this zone.
The evidence of the zones where the road passes in
cutting and their calculation.
Classification of the different cutting’s types.
Engineering measures for the protection of the
equilibrium of the slopes and environment in the zone of
the new road.
2. PHYSICALGEOLOGICALAND
GEODYNAMICAL PHENOMENA’S
By Albanian geological map, existing investigations and
new information from our study, in the zone where
will passes the new road, we have evidenced or observed
the following geological phenomena’s:[1]
2.1.
Erosion Phenomenon
This phenomenon is visible in all hilly part of the road’s
axis. The heavy rainfall, the current of the surface water,
the inclination of the slopes, the type of the soils and
weathered part of core formation are causes of this
phenomenon. The body of road is at the middle part of
the valley and it is exposed to this phenomenon and
negative action of the erosion. For this we recommended
not only remove the water by means of ditches, but
during excavation, the road must protected in the upper
and bottom part, to not allow erode of the slope’s
material, small surface slides and detaching of the mass
rock.
