Faculty Publications
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Item Model Footing Tests on Sand Bed to Evaluate Efficiency of Tire Crumb as Infill Materials in Geocells(Springer Science and Business Media Deutschland GmbH, 2022) Kolathayar, S.; Chitrachedu, R.K.This paper presents the results of model footing tests on sand bed reinforced with HDPE and coir geocells. The infill material influences the performance of geocells. The potential of sand tire crumb (STC) mixture as infill material is evaluated in the study in comparison with pure sand as infill materials. To select the appropriate blend of sand and tire crumb, the shear properties and density properties were analyzed by performing direct shear and density tests. The mix which has shown the highest shear strength and density properties has been selected, and plate load tests were carried to analyze the mechanism and effectiveness of tire crumb as infill material in geocell pockets. From the results, it is clear that the sand tire crumb mix is effective as infill materials, especially for coir geocells. The surface heave was found to reduce significantly with sand tire crumb mix as infill material. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.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.Item Comparative Study for Performance of Soil Bed Reinforced with Jute and Sisal Geocells as Alternatives to HDPE Geocells(Springer Science and Business Media Deutschland GmbH, 2020) Kolathayar, S.; Sowmya, S.; Priyanka, E.This paper presents the performance of soil bed reinforced with jute and sisal geocells compared to HDPE geocells. The bearing pressure–settlement behaviour of the soil bed reinforced with natural geocells, soil bed reinforced with HDPE geocells and of unreinforced soil bed are discussed. The soil bed reinforced with jute cell and sisal cell showed a uniform increase in the settlement with increase in the applied pressure. The soil reinforced with HDPE geocell, however, showed a sudden rise in the settlement at higher pressure. Sisal mat used for developing the geocell was found to have greater tensile strength, followed by jute mat over HDPE material. Soil reinforced with sisal cells could bear larger stresses at lower strain compared to HDPE geocell. Analytical studies on jute and sisal geocells also were carried out considering the load transfer mechanism of geocell-reinforced soil. © 2020, Springer Nature Switzerland AG.Item Performance Evaluation of Jute Geocell-Reinforced Sand Subgrade with an Integrated Wooden Anchor Grid(Springer Science and Business Media Deutschland GmbH, 2025) Kumar, P.; Kumar, D.H.; Bandyopadhyay, T.S.; Raveendran, D.; Kolathayar, S.; Mulangi, R.H.The efficient confinement capabilities of geocells make them a popular reinforcement technique for improving soil stability and load-bearing capacity. However, the high costs of synthetic geocells and environmental concerns have driven interest in more sustainable and natural alternatives. This study presents a novel approach to subgrade reinforcement using a jute geocell (JG) made from jute fabric, further improved with a wooden anchor grid (WAG). The newly developed jute geocell with wooden anchor grid (JGWAG) consists of a natural wooden grid integrated with anchor pins placed at the center of each JG pocket, aiming to enhance load-bearing capacity. The effectiveness of this innovative reinforcement system was evaluated through static plate load tests on sand subgrade reinforced with JG mattresses of varying widths (1.33D, 2D, and 3.33D, where D is the loading plate diameter) and a WAG placed beneath the 2D-width geocell. The results demonstrated significant performance enhancements: load-bearing capacity increased by 41%, 83.8%, and 116% for 1.33D, 2D, and 3.33D, respectively, compared to unreinforced subgrade. Notably, adding WAG under the 2D-width geocell achieved a remarkable 186% improvement over the unreinforced case. Settlement reduction was also significant, with the JGWAG system decreasing settlement by 84.6% as compared to the unreinforced case, showcasing its superior effectiveness. This system improves load-bearing performance and provides a cost-effective solution by reducing the width of JG. Furthermore, the surface roughness of the JG was analyzed using a 3D surface profilometer, ensuring optimal contact and friction between the soil and reinforcement for improved load transfer. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.