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Seismic site response analysis of Indo-Bangla railway site at Agartala incorporating site-specific dynamic soil properties
Abstract Site-specific dynamic soil properties, such as nonlinear stiffness and damping of subsoil, play a crucial role in assessment of vulnerability of structures incorporating seismic soil structure interaction (SSSI). The present study aims at the evaluation of dynamic parameters of subsoil samples collected from a case study railway construction site at Agartala, capital of Tripura, a North Eastern (NE) state of India, which is situated in an active seismic zone. Soil samples extracted from the site were mainly constituted of peat clay and very soft clay at shallow depth followed by silty fine sand layer at moderate to higher depth below existing ground level (EGL). A series of small strain and large strain element tests were conducted using bender element (BE) and cyclic triaxial (CTX) apparatus to obtain the shear modulus and damping ratio. Then, implications of dynamic properties of soil are studied through one-dimensional ground response analysis (1D GRA) using site-specific synthetic ground motions attributing scenario earthquakes. This study provides valuable inputs on importance of consideration of local site effect while performing the seismic design of structures embedded in soft alluvial deposits. Besides, the stiffness contrast of subsoil layers and ground motion are found to be key influential parameters. Finally, a case study analysis on seismic response of railway embankment also validates the importance of local site effect.
Seismic site response analysis of Indo-Bangla railway site at Agartala incorporating site-specific dynamic soil properties
Abstract Site-specific dynamic soil properties, such as nonlinear stiffness and damping of subsoil, play a crucial role in assessment of vulnerability of structures incorporating seismic soil structure interaction (SSSI). The present study aims at the evaluation of dynamic parameters of subsoil samples collected from a case study railway construction site at Agartala, capital of Tripura, a North Eastern (NE) state of India, which is situated in an active seismic zone. Soil samples extracted from the site were mainly constituted of peat clay and very soft clay at shallow depth followed by silty fine sand layer at moderate to higher depth below existing ground level (EGL). A series of small strain and large strain element tests were conducted using bender element (BE) and cyclic triaxial (CTX) apparatus to obtain the shear modulus and damping ratio. Then, implications of dynamic properties of soil are studied through one-dimensional ground response analysis (1D GRA) using site-specific synthetic ground motions attributing scenario earthquakes. This study provides valuable inputs on importance of consideration of local site effect while performing the seismic design of structures embedded in soft alluvial deposits. Besides, the stiffness contrast of subsoil layers and ground motion are found to be key influential parameters. Finally, a case study analysis on seismic response of railway embankment also validates the importance of local site effect.
Seismic site response analysis of Indo-Bangla railway site at Agartala incorporating site-specific dynamic soil properties
Debnath, Rajat (author) / Saha, Rajib (author) / Haldar, Sumanta (author) / Patra, Sangeet Kumar (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
Site Response Evaluation of Agartala City Using Geophysical and Geotechnical Data
| Tema Archive | 2013
Characterization of Soft Soil Deposit of Indo-Bangla Railway Project
| Springer Verlag | 2021
Dynamic Characterization of Sand of Indo-Bangla Border for Seismic Design
| Springer Verlag | 2021