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Sarkar, Rajib
- Seismic Behaviour of RC Building with Raft Foundation in the Ganges Basin, India
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Authors
Affiliations
1 Department of Civil Engineering, Indian Institute of Technology (ISM), Dhanbad 826 004, IN
2 Jharkhand Urja Sancharan Nigam Limited, Ranchi 834 004, IN
3 Water Resources Department Madhya Pradesh, Bhopal 462 003, IN
1 Department of Civil Engineering, Indian Institute of Technology (ISM), Dhanbad 826 004, IN
2 Jharkhand Urja Sancharan Nigam Limited, Ranchi 834 004, IN
3 Water Resources Department Madhya Pradesh, Bhopal 462 003, IN
Source
Current Science, Vol 118, No 5 (2020), Pagination: 759-770Abstract
Many highly populated and important cities of India are situated in the Ganges basin. Deep alluvium deposit of this basin enhances the earthquake vulnerability of these cities due to amplification of seismic energies in the case of an earthquake. Raft foundations are generally provided for critical facility buildings due to their perceived effectiveness against differential settlement during earthquakes. However, the literature available on seismic behaviour of buildings with raft foundation considering soil deformability is relatively limited. In this context, a full three-dimensional finite element model of a four-storeyed building with raft foundation considering the typical layered soil profile of the Ganges basin has been developed in this study. The effects of different seismic parameters on the structural responses and moments induced in the raft have been studied with ground motions from 10 different earthquakes. Since the alluvium deposit of the Ganges basin is prone to get liquefied, effects of liquefaction of soil on the building with raft foundation have been considered simplistically. The results show that the raft foundation reduces the lateral displacement of the structure considerably. However, an increase in the vertical settlement of the raft in case of liquefiable soil is a matter of concern.Keywords
Layered Soil Profile, Raft Footing, River Basin, Soil–Structure Interaction.References
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- Bearing capacity of spatially variable unsaturated fly ash deposit using random field theory
Abstract Views :209 |
PDF Views:109
Authors
Affiliations
1 Department of Civil Engineering, Indian Institute of Technology (Indian School of Mines) Dhanbad, Dhanbad 826 004, IN
2 Department of Civil Engineering, Indian Institute of Technology (Indian School of Mines) Dhanbad, Dhanbad 826 004, IN
1 Department of Civil Engineering, Indian Institute of Technology (Indian School of Mines) Dhanbad, Dhanbad 826 004, IN
2 Department of Civil Engineering, Indian Institute of Technology (Indian School of Mines) Dhanbad, Dhanbad 826 004, IN
Source
Current Science, Vol 122, No 5 (2022), Pagination: 542-556Abstract
The aim of the present study is to examine the bearing capacity of a spatially variable, unsaturated fly ash deposit, based on finite element limit analyses. Strength nonlinearity of fly ash, arising due to partial saturation, has been modelled based on the well-known van Genuchten (vG) fitting parameters, obtained from the water retention characteristics curve (WRCC). For the probabilistic study, WRCC fitting parameters and angle of internal friction of the fly ash deposit have been considered as stationary Gaussian random fields within a practicable range of coefficient of variation and anisotropic correlation lengths. Random field has been generated based on the Karhunen–Loeve expansion method. Adequate numbers of Monte-Carlo simulations have been executed to evaluate the probabilistic distribution of the bearing capacity, considering strength nonlinearity as well as the random distribution of the input parameters. Influence of stationary spatial variation of WRCC fitting parameters and friction angle on the probability of failure of a footing resting on the fly ash deposit is presented and observations are duly explained. The results of this study would be useful for practising engineers to design a safe fly ash fill and therefore offer a sustainable solution for the bulk utilization of fly ash in geotechnical engineering applications.Keywords
Bearing capacity, finite element limit analysis, geotechnical engineering applications, probabilistic analysis, strength nonlinearity, unsaturated fly ash.References
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- Assessment of Overburden Dump and Highwall Slope Stability for Jambad Open Cast Coal Mine, West Bengal, India, using in Situ and Laboratory Testing
Abstract Views :234 |
PDF Views:99
Authors
Affiliations
1 Department of Civil Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, IN
1 Department of Civil Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad 826 004, IN
Source
Current Science, Vol 123, No 2 (2022), Pagination: 184-193Abstract
In this study, in situ multichannel analysis of surface waves was performed to characterize the overburden (OB) layers for Jambad open cast coal mine, West Bengal, India. OB dump samples were also collected and laboratory tests were carried out to evaluate the compaction and strength characteristics. Stability anal-yses of the OB dump slope and highwall were carried out using the finite element-based software Optum G2 considering the configurations suggested by the Eastern Coalfield Limited, India. The stability was also assessed for seismic loading conditions considering pseudo-static loading. This study concludes with recommenda-tions for geometric configurations of the OB dump and highwall slope.Keywords
Coal Mine Overburden, Dump Slope, High-wall, Laboratory Tests, Surface WaveReferences
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