Faculty Publications
Permanent URI for this communityhttps://idr.nitk.ac.in/handle/123456789/18736
Publications by NITK Faculty
Browse
2 results
Search Results
Item Three dimensional modeling of geocell using membrane elements by considering the actual curvature(American Institute of Physics Inc., 2021) Vibhoosha, M.P.; Bhasi, A.Railway Networks are popular world wide because of its ride quality and low cost. In order to meet the ever growing demand, the track operational efficiency has to be improved with minimal maintenance and infrastructure cost. By providing a three dimensional honey comb structure known as geocell on track substructure, the lateral deformation of the ballast and sub ballast can be effectively reduced and the overall stability is improved. The 3D modeling of geocell is complex as it involves interaction between geocell walls and the fill material inside. Different constitutive models were used for both geocell and infill material with suitable interaction properties. By using the membrane elements the hexagonal shape of geocell was simulated. In this paper, full 3-d finite element analyses were carried out using developed numerical model to study the lateral deflection of geocell reinforced subballast system. Also a comparison was made between 3D and 2D numerical models. © 2021 American Institute of Physics Inc.. All rights reserved.Item Analysis of Geocell-Reinforced Stone Column-Supported Embankment Considering Soil-Structure Interaction(Springer, 2022) Vibhoosha, M.P.; Bhasi, A.; Nayak, S.Geocells are a superior form of reinforcement due to their cost-effectiveness and three-dimensional confining properties. The effect of the basal geocell layer on the performance of the stone column-supported embankment was evaluated in this paper by carrying out time-dependent coupled analyses considering the geocell-infill soil interactions. The various parameters, such as arching, stress concentration ratio, surface settlement, column bulging characteristics, and the influence of various types of infill materials and drainage blanket thickness on column-supported embankment behavior, were analyzed. The load transfer mechanism was quantified using the term stress concentration ratio, and with the use of geocell mattress above stone columns, the stress concentration ratio increased by 1.5 times that of ordinary stone columns. Also, it was observed that compared to ordinary stone column-supported embankment, the combination of stone columns with geocell-sand mattress resulted in a further reduction of the foundation settlement by 15%. Analysis results showed that the arching behavior is not predominant in geocell-reinforced columnar structures. The various analytical methods like Guido et al. (1987), Low et al. (1994), and Abusharar et al. (2009), which were developed for geosynthetic reinforced columnar embankments, were found to significantly under-predict the stress reduction ratio values with geocells. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.