Conference Papers
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Item A novel cross-linked PVA-Chitosan composite membrane for heavy metal filtration applications(Elsevier Ltd, 2022) Deekshitha, K.; Rao, M.S.; Rebello, N.; Ramaprasad, A.T.; Arasalike, A.; Pinto, R.A novel glutaraldehyde cross-linked Chitosan-PVA (GCP) polymer composite membrane is used to create a water filtration device. The GCP polymer membrane is synthesised using the solution casting process. GCP membranes are characterised using different techniques. The results showed that this filtration unit developed using GCP membrane is effective in reducing the Lead, Cadmium, Sodium and Iron content by 99.32%, 98.1, 88.21% and 78.9% respectively. The creation of nano-pores in GCP membrane, the adsorbent property of GCP and the thermal and chemical stability of GCP are the key factors leading to high performance filtration of major metal contaminants in ground water. © 2022Item Finite Element Modelling of Foundation on Soft Clay Improved by Geocell and Boulder-Sand Layer: A Comparative Study(Springer Science and Business Media Deutschland GmbH, 2025) Rao, M.S.; Sridhar, G.Rapid infrastructure development urges for sufficient competent ground, which is currently scarce. Thus, the major focus of geotechnical engineers is the development of techniques for improving poor soil. A variety of strategies are used to reduce post-construction settlement, increase the shear strength of the soil, enhance the bearing capacity of the soil system, and improve the stability of superstructures. Among these, soil replacement is the simplest and most widely used method, while geocell reinforcement has been found to be an effective methodology. The three-dimensional structure of geocell provides better lateral confinement to the infill soil, improving its ability to support loads. However, because of its intricate honeycomb structure, numerical modelling of geocell has always proven difficult. Thus, an attempt has been made to generate a three-dimensional model of geocell using PLAXIS 3D. Finite element model was validated using laboratory model test results. A numerical analysis of footing resting over unimproved soft soil and soft soil improved by boulder-sand replacement and geocell reinforcement has been carried out. It was found that by replacement and reinforcement techniques, the performance of the footing can be doubled. The influence of width and depth of the boulder-sand layer and depth of the first geocell layer on bearing capacity improvement has been studied. The effect of the depth of boulder-sand bed on the influence factor was found to be higher compared to the effect of width. Maximum improvement by the inclusion of geocell was observed when it was placed in the middle of the sand layer with an improvement factor of 2.25. Further, using soil investigation data from in situ and laboratory tests, the concept has been extended to a field problem. © Deep Foundations Institute 2025.Item Comparative Study of Analytical and Numerical Modelling of Bearing Pressure of Shallow Foundation(Springer Science and Business Media Deutschland GmbH, 2025) Rao, M.S.; Sridhar, S.Settlement is the predominant criterion that governs the design of footing on frictional and cohesive frictional soil. Hence bearing pressure plays a key role in design of footing. To evaluate the bearing pressure, Teng, Meyerhof and other researchers proposed empirical formula and charts in terms of N values obtained from Standard Penetration Test (SPT). In the present study, soil investigation data obtained from four sites have been used to estimate the bearing pressure through empirical formula and finite element analysis. Finite element model is validated through the case studies available in the literature. Bearing pressure values for strip footing of width varying from 1.5 to 5.5 m were estimated. Further, an attempt has been made to check the reliability of empirical formula by comparing it with values obtained through numerical analysis. It is observed that if the SPT-N values are directly taken from the field tests, the results from Meyerhof expression were found to be in good agreement with the numerical model. Whereas, if only shear strength parameters are obtained from site, SPT-N value calculated indirectly using friction angle excludes the effect of cohesion. Hence, Meyerhof expression resulted in comparatively lower bearing pressure values. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.