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GEOTECHNICAL CHARACTERISTICS OF THE FORMATION OF “TOURKOVOUNIA” LIMESTONES AND THEIR INFLUENCE ON URBAN CONSTRUCTION - CITY OF ATHENS, GREECE (2006)

All the hilltops of the city of Athens are occupied by the formation of "Tourkovounia" Limestones. Some of the most important monuments in the city and also many residential areas are founded on these formations. The world renowned monument of Acropolis, the ancient Supreme Court (Arios Pagos), and the Pnika are prime examples of monuments founded on these limestones. A detailed knowledge of the geotectonic data and geotechnical characteristics regarding these formations are clearly important for construction work in these areas. From the evaluation of engineering-geological maps and tectonic data, from both recent and older studies, it can be determined that these formations are intersected by faults, mainly normal, which in some locations have been subject to intensive karstic weathering. This weathering turns those faults into wide karstic fissures. The karstic voids formed by this mechanism are often 0.5 to 2 m wide and can be infilled or partially infilled with clay or stalagmitic materials. When the karstic fissures intersect the voids can get extremely wide and in some places the voids were up to 15m across. The influence of Karst structures on the geotechnical behaviour of the limestones is significant and this must be taken into account at design stage. This paper aims to present data regarding the engineering geological setting and properties of the Tourkovounia limestones. In particular, the paper presents data about the stress field that caused the main neotectonic structures, the distribution and the geotechnical characteristics of the karstic fissures, the orientation and the geometry of the joint sets and finally the geotechnical parameters of the limestones.
Reference:
The 10th IAEG International Congress, Nottingham, United Kingdom, 6-10 September 2006, Paper number 794
Organization:
Institute of Geology and Mineral Exploration
Greece
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