The Experts below are selected from a list of 2619 Experts worldwide ranked by ideXlab platform
Benjamin P Horton - One of the best experts on this subject based on the ideXlab platform.
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a new quaternary stratigraphy of the kallang river basin singapore implications for urban development and geotechnical engineering in singapore
Journal of Asian Earth Sciences, 2020Co-Authors: Stephen Chua, Adam D Switzer, Timothy I Kearsey, Michael I Bird, Cassandra Rowe, Kiefer Chiam, Benjamin P HortonAbstract:The Quaternary stratigraphy of many coastal areas in Southeast Asia is poorly understood. Developing a detailed framework is important as many coastal cities are built on these unconsolidated coastal-marine sediments. This study reviews the current understanding of Quaternary deposits in the Kallang River Basin, Singapore, using 161 boreholes to create 14 cross-sections and a 3D geological model. The dataset is augmented with a similar to 38.5 m long sediment core obtained from Marina South (1.2726 degrees N, 103.8653 degrees E), and a previous record from Geylang (1.3137 degrees N; 103.8917 degrees E), to provide age constraints and stratigraphic reference. A new Quaternary stratigraphic framework for Singapore is presented here, constrained by new radiocarbon and Optically Stimulated Luminescence (OSL) dating, and identify palaeo-features that record the geomorphic and sedimentary evolution of the basin. Fluvial deposits of Pleistocene age are uncomfortably overlain by littoral/tidal sands and subsequently marine Clay possibly during Marine Isotope Stage (MIS) 5e (similar to 125 ka BP). Subsequent subaerial exposure and weathering of the marine Clay during the last interglacial produced a 'Stiff Clay' layer. The Stiff Clay is unconformably overlain by Holocene transgressive sands and pears from similar to 9.5 ka BP, followed by marine Clays with a maximum basal age of similar to 9.2 ka BP. Regressive sandy/peat units were subsequently deposited beginning similar to 6 ka BP. Here the new Quaternary stratigraphic framework for Singapore is presented, as well as provide important constraints on the regional sea-level history and geomorphological evolution of Singapore's southern coast from MIS 5e to present. The work also highlights the complexities of geoengineering work in such subsurface terranes.
Matteo Rompato - One of the best experts on this subject based on the ideXlab platform.
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transport infrastructure shm using integrated sar data and on site vibrational acquisitions ponte della musica armando trovajoli case study
Applied Sciences, 2021Co-Authors: Felice Carlo Ponzo, Chiara Iacovino, Rocco Ditommaso, Manuela Bonano, R Lanari, Francesco Soldovieri, V Cuomo, Francesca Bozzano, Paolo Ciampi, Matteo RompatoAbstract:This work presents the first results obtained by applying in situ and remote-sensing methodologies to monitor the Ponte della Musica-Armando Trovajoli located in Rome, within the activities of the WP6 “Structural Health Monitoring and Satellite Data” 2019-21 Reluis Project. In particular, the use of remote-sensing Differential Synthetic Aperture Radar (SAR) Interferometry (DInSAR) measurements provided a spatial map of the displacement of the investigated infrastructure and the corresponding time-series, with the aim of monitoring deformation phenomena, focusing on the local scale analysis, which produces suitable results for urban monitoring and damage assessment. The DInSAR results have been integrated with the identification of the dynamic characteristics of the bridge, performed through an experimental campaign of ambient vibration measurements carried out in October 2020 and with the local-scale definition of the engineering geological setting of the foundation soil. The subsoil of the bridge is constituted by more than 50 m of recent alluvial deposits resting on Pliocene Stiff Clay acting as a geological bedrock. A substantially stable behavior of the bridge structural elements has been observed based on the analysis of both satellite and velocimetric data. This case represents a good example about how the integration of in situ sensors with remotely sensed data and the exploitation of a detailed knowledge regarding the on-site conditions represent a key factor for a sustainable structural and infrastructural monitoring and can support the planning both of maintenance and safety management.
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Transport Infrastructure SHM Using Integrated SAR Data and On-Site Vibrational Acquisitions: “Ponte Della Musica–Armando Trovajoli” Case Study
'MDPI AG', 2021Co-Authors: Felice Carlo Ponzo, Chiara Iacovino, Rocco Ditommaso, Manuela Bonano, R Lanari, Francesco Soldovieri, V Cuomo, Francesca Bozzano, Paolo Ciampi, Matteo RompatoAbstract:This work presents the first results obtained by applying in situ and remote-sensing methodologies to monitor the Ponte della Musica-Armando Trovajoli located in Rome, within the activities of the WP6 “Structural Health Monitoring and Satellite Data” 2019-21 Reluis Project. In particular, the use of remote-sensing Differential Synthetic Aperture Radar (SAR) Interferometry (DInSAR) measurements provided a spatial map of the displacement of the investigated infrastructure and the corresponding time-series, with the aim of monitoring deformation phenomena, focusing on the local scale analysis, which produces suitable results for urban monitoring and damage assessment. The DInSAR results have been integrated with the identification of the dynamic characteristics of the bridge, performed through an experimental campaign of ambient vibration measurements carried out in October 2020 and with the local-scale definition of the engineering geological setting of the foundation soil. The subsoil of the bridge is constituted by more than 50 m of recent alluvial deposits resting on Pliocene Stiff Clay acting as a geological bedrock. A substantially stable behavior of the bridge structural elements has been observed based on the analysis of both satellite and velocimetric data. This case represents a good example about how the integration of in situ sensors with remotely sensed data and the exploitation of a detailed knowledge regarding the on-site conditions represent a key factor for a sustainable structural and infrastructural monitoring and can support the planning both of maintenance and safety management
Stephen Chua - One of the best experts on this subject based on the ideXlab platform.
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a new quaternary stratigraphy of the kallang river basin singapore implications for urban development and geotechnical engineering in singapore
Journal of Asian Earth Sciences, 2020Co-Authors: Stephen Chua, Adam D Switzer, Timothy I Kearsey, Michael I Bird, Cassandra Rowe, Kiefer Chiam, Benjamin P HortonAbstract:The Quaternary stratigraphy of many coastal areas in Southeast Asia is poorly understood. Developing a detailed framework is important as many coastal cities are built on these unconsolidated coastal-marine sediments. This study reviews the current understanding of Quaternary deposits in the Kallang River Basin, Singapore, using 161 boreholes to create 14 cross-sections and a 3D geological model. The dataset is augmented with a similar to 38.5 m long sediment core obtained from Marina South (1.2726 degrees N, 103.8653 degrees E), and a previous record from Geylang (1.3137 degrees N; 103.8917 degrees E), to provide age constraints and stratigraphic reference. A new Quaternary stratigraphic framework for Singapore is presented here, constrained by new radiocarbon and Optically Stimulated Luminescence (OSL) dating, and identify palaeo-features that record the geomorphic and sedimentary evolution of the basin. Fluvial deposits of Pleistocene age are uncomfortably overlain by littoral/tidal sands and subsequently marine Clay possibly during Marine Isotope Stage (MIS) 5e (similar to 125 ka BP). Subsequent subaerial exposure and weathering of the marine Clay during the last interglacial produced a 'Stiff Clay' layer. The Stiff Clay is unconformably overlain by Holocene transgressive sands and pears from similar to 9.5 ka BP, followed by marine Clays with a maximum basal age of similar to 9.2 ka BP. Regressive sandy/peat units were subsequently deposited beginning similar to 6 ka BP. Here the new Quaternary stratigraphic framework for Singapore is presented, as well as provide important constraints on the regional sea-level history and geomorphological evolution of Singapore's southern coast from MIS 5e to present. The work also highlights the complexities of geoengineering work in such subsurface terranes.
Filippo Vinale - One of the best experts on this subject based on the ideXlab platform.
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strain rate dependent behaviour of a natural Stiff Clay
Soils and Foundations, 1999Co-Authors: A Donofrio, Francesco Silvestri, Filippo VinaleAbstract:The experimental results reported in this paper were obtained performing monotonic, cyclic and dynamic torsional shear tests on a Stiff Italian Clay in the pre-failure stress-strain range. The experimental clearly demonstrate that the small strain values of shear Stiffness and damping ratio are significantly affected by strain rate : while the initial shear modulus G0 continuously increases with strain rate, the equivalent viscous damping ratio D0 initially decreases with strain rate, then it reaches a minimum constant value and thereafter it increases significantly. The experimental data also demonstrate that, if the strain rate is properly accounted for, a linear behaviour for the soil is no longer distinguishable, even at strain levels as low as 10-4%. As a whole, these effects could have meaningful practical implications, thus requiring to be accounted for in modelling soil behaviour in those problems where the rate of loading varies significantly.
Vidal Romaní, Juan Ramón - One of the best experts on this subject based on the ideXlab platform.
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Los bolos residuales ¿se deben a la meteorización o a la tectónica? Problemas y sugerencias
'Universidade da Coruna', 2020Co-Authors: Twidale, Charles Rowland, Vidal Romaní, Juan RamónAbstract:Many of the so-called corestones have been developed from rocky blocks that have been apparently affected by subsurface physicochemical weathering that results in lamination, granulation, and eventually a puggy or Stiff Clay. The truth is that weathering takes advantage of a previous deformation structure and does not create it by weathering.Muchas de los llamados bolos residuales se han desarrollado a partir de bloques rocosos que han sido aparentemente afectados por la meteorización fisicoquímica del subsuelo que da lugar a la laminación, la granulación y, finalmente, a una arcilla rugosa o rígida. Lo cierto es que el desgaste aprovecha una estructura de deformación previa y no la crea por el desgaste
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Los bolos residuales ¿se deben a la meteorización o a la tectónica? Problemas y sugerencias
'Universidade da Coruna', 2020Co-Authors: Twidale, Charles Rowland, Vidal Romaní, Juan RamónAbstract:[Abstract] Many of the so-called corestones have been developed from rocky blocks that have been apparently affected by subsurface physicochemical weathering that results in lamination, granulation, and eventually a puggy or Stiff Clay. The truth is that weathering takes advantage of a previous deformation structure and does not create it by weathering.[Resumen] Muchas de los llamados bolos residuales se han desarrollado a partir de bloques rocosos que han sido aparentemente afectados por la meteorización fisicoquímica del subsuelo que da lugar a la laminación, la granulación y, finalmente, a una arcilla rugosa o rígida. Lo cierto es que el desgaste aprovecha una estructura de deformación previa y no la crea por el desgaste