Digital Engineering Geological Map of the Athens Prefecture Area and Related Database Management System

Kynigalaki, M.; Nikolaou, N.; Karfakis, J.; Koutsouveli, A.; Poyiadji, Eleftheria; Pyrgiotis, Lambros; Konstantopoulou, Garyfalia; Bellas, Michael; Apostolidis, Emmanuel; Loupasakis, K.; Spanou, N.; Sabatakakis, N.; Koukis, G.

doi:10.12681/bgsg.11336

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…This information, along with details on the excavation and its associated risks, was publicized by [30]. A representative cross section of the tunnel is given in Figure 8 (based on [31]). Furthermore, according to the official records, the excavation front progress was at a constant rate of ≈5 m per day and no changes to the support measures or any other modifications to the excavation procedure were reported.…”

Section: Evidence From the Athens Metro Linementioning

confidence: 99%

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Ground Loss and Static Soil–Structure Interaction during Urban Tunnel Excavation: Evidence from the Excavation of the Athens Metro

Kontogianni

Stiros

2020

Infrastructures

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Ground settlement above urban tunnels is a threat for nearby buildings, because it may lead to their differential settlement, tilting, and damage, depending on their structural characteristics, on ground conditions, and on the excavation procedure. Still, for few cases only details on ground settlement are known. In this article we analyze ground subsidence data during the excavation of Lines 2 and 3 of the Athens Metro. Based on this evidence, and in comparison with previous studies, we show that observations of elevation changes and of tilting of buildings may underestimate the amount of ground loss; this is because part of the ground deformation may be compensated by the stiffness of buildings or accommodated by internal deformation of sizeable buildings hosting measuring benchmarks. This effect can be described as static soil–structure interaction (sSSI), in analogy to the dynamic SSI produced during earthquakes. sSSI can produce bias in monitoring data above an advancing tunnel front, leading to skew and not to symmetric subsidence curves if observations are made on one side on buildings and on the other side in open spaces (‘greenfields’). Furthermore, we show that ‘bowls’ of increased subsidence are observed along subsidence troughs during excavation; such ‘bowls’, not infrequently underestimated because of sSSI, may conceal a potential for sinkholes and other types of failure. Isolated towers on the contrary describe well ground subsidence and tilting.

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Section: Evidence From the Athens Metro Linementioning

confidence: 99%

“…A sketch of the tunnel cross section beneath Panagi Tsaldari Ave (geology taken from[31]). The excavated diameter is 9.5 m and crown is at 15-20 m below ground surface.…”

mentioning

confidence: 99%

Ground Loss and Static Soil–Structure Interaction during Urban Tunnel Excavation: Evidence from the Excavation of the Athens Metro

Kontogianni

Stiros

2020

Infrastructures

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Ground Subsidence Triggered by the Overexploitation of Aquifers Affecting Urban Sites: The Case of Athens Coastal Zone along Faliro Bay (Greece)

et al. 2020

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Land subsidence in the coastal zone of the Neo Faliro, Moschato, and Kallithea municipalities, along the Faliro bay, has been recorded since the mid 1960’s. This phenomenon has caused damage to buildings, pavements, and roads. Aiming to identify the main causes of the observed ground deformations, data referring to the geological, geotechnical, and hydrogeological settings of the study area has been evaluated. Subsidence has been quantified by the use of space-born Synthetic Aperture Radar interferometry (InSAR) techniques. SVD (Singular Value Decomposition) and IPTA (Interferometric Point Target Analysis) techniques have been applied for the production of deformation maps, referring to the time period between 2002 and 2010. Furthermore, aiming to extend the study of the phenomenon further to the past, Persistent Scatterer Interferometry (PSI) data for the time period from 1992 to 2001 were also evaluated. Finally, the results of the InSAR analysis have been crosschecked with measurements acquired by a vertical geodetic control network as well as by ground truth data, referring to damage inventory of the site. The current research presents an interesting case study of an urban site affected for a long-lasting period by the activities of a neighboring industrial zone. The development of an extensive depression cone, mainly due to the overexploitation of the aquifers for industrial use, is the main cause of the land subsidence phenomenon, without excluding a component of motion due to the natural compaction of the compressible soil in the area of interest. The complexity of the geological, hydrogeological, and geotechnical conditions and the interaction of the numerous land use activities make this study far more interesting.

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Engineering-geological conditions of the formations in the Western Thessaly basin, Greece

Apostolidis

Koukis

2013

Open Geosciences

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An engineering-geological map of the Western Thessaly basin has been compiled, providing a valuable guide to both urban planning and industrial development of the wider area. This map contributes significantly to the optimization of land use and improved planning of technical work. Additionally, the engineering-geological conditions of the formations encountered in the Western Thessaly basin are examined. The formations are grouped into thirteen (13) engineering-geological entities, with regard to their geotechnical behaviour. This entire study was based on both in situ investigations and geotechnical information extracted from 1,039 boreholes. Furthermore, a landslide inventory map of the Western Thessaly basin has been compiled. In addition, the surface subsidence ruptures, due to ground-water overexploitation, have been examined in the eastern part of the study area.

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Digital Engineering Geological Map of the Athens Prefecture Area and Related Database Management System

Abstract: A digital engineering-geological map of the Athens Prefecture area was compiled at an original

Cited by 3 publications

References 2 publications

Ground Loss and Static Soil–Structure Interaction during Urban Tunnel Excavation: Evidence from the Excavation of the Athens Metro

Ground Loss and Static Soil–Structure Interaction during Urban Tunnel Excavation: Evidence from the Excavation of the Athens Metro

Ground Subsidence Triggered by the Overexploitation of Aquifers Affecting Urban Sites: The Case of Athens Coastal Zone along Faliro Bay (Greece)

Engineering-geological conditions of the formations in the Western Thessaly basin, Greece

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