Faculty Publications

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Author: search.filters.author.Shivashankar, R.Subject: search.filters.subject.Finite element analysis

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    Seismic Behaviour of Soil Nailed Wall
    (Springer Science and Business Media Deutschland GmbH, 2021) Amrita; Jayalekshmi, B.R.; Shivashankar, R.
    Soil nailing is a technique used to stabilise steep cut slopes and to retain excavations. The method consists of inserting nail bars into the ground either by drilling or by grouting. The present study evaluates the seismic behaviour of a soil nailed wall supporting a vertical cut of height 6 m. The finite element analysis has been carried out to study the stability and performance of the soil nailed wall using ANSYS software. The seismic resistance of the wall is analysed under the El-Centro ground motion. The seismic response variation for different parameters such as angle of inclination of nails and soil strength properties are studied. The maximum lateral displacements and acceleration response of soil nailed wall are evaluated under static as well as dynamic conditions. The results of the study indicate that soil nailed system imparts stability to the retaining system under dynamic conditions. © 2021, Springer Nature Singapore Pte Ltd.
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    Dynamic Response of Soil Nailed Wall
    (Springer Science and Business Media Deutschland GmbH, 2021) Amrita; Jayalekshmi, B.R.; Shivashankar, R.
    Soil nailing is a technique used to stabilize steep cut slopes and to retain excavations. The method consists of inserting nail bars into the ground to stabilize the soil mass. The present study evaluates the dynamic response of a soil nailed wall supporting a vertical cut of height 6 m. The finite element analysis has been carried out to study the stability and performance of the soil nailed wall using PLAXIS 2D software. The seismic resistance and failure mechanism of the wall are analyzed under the El Centro ground motion. The seismic response variation for different parameters such as angle of inclination of nail and length of nail is studied. The results are observed in terms of maximum lateral displacement, development of maximum tensile force in nails and failure mechanism of soil nailed wall under static and dynamic conditions. The results of the study indicate that the soil nailed structure is an effective method which imparts stability to the retaining system under dynamic conditions. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
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    Behaviour of Prestressed Geosynthetic Reinforced Granular Beds Overlying Weak Soil
    (2014) Shivashankar, R.; Jayamohan, J.
    This paper presents an analytical model for predicting the improvement in bearing capacity of geosynthetic reinforced granular beds overlying weak soil due to prestressing the reinforcement. A punching shear failure mechanism is envisaged in the analytical model. Results obtained from a series of laboratory scale bearing capacity tests and finite element analyses are used to validate the model. The addition of prestress to the reinforcement results in significant improvement of the settlement response and the load-bearing capacity of the foundation. The parameters studied are strength of underlying weak soil, thickness of granular bed, magnitude of prestressing force, direction of prestressing forces, type of reinforcement and number of layers of reinforcement. The bearing capacity ratios (BCRs) values predicted by the analytical model are found to be in good agreement with the experimentally obtained BCR values. Finite element analysis are carried out using the FE program PLAXIS to study the effect of prestressing the reinforcement. Results obtained from finite element analysis are found to be in reasonably good agreement with the experimental results. © 2013 Indian Geotechnical Society.
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    Shear Strength Behaviour of Pervious Concrete Column Improved Soft Clay Bed: A Numerical Study
    (Springer, 2022) Rashma, R.S.V.; Jayalekshmi, B.R.; Shivashankar, R.
    In this study, the shear strength of plain and reinforced stone column improved weak soil is presented by numerically analysing direct shear test models. The reinforced stone column considered is pervious concrete column. The objective is to compare the shear behaviour of ordinary stone column improved weak soil with pervious concrete column improved weak soil. A total of 378 direct shear test models were analysed to study the effect of normal pressure, effect of diameter, effect of reinforcement and lateral deformation of columns. Inclined direct shear tests were also analysed by varying the slope (±) of potential failure surface with horizontal to represent the actual practical conditions and findings are presented. The ultimate shear strength of pervious concrete column improved soil bed is found to be higher than ordinary stone column improved soil bed. It is found that the pervious concrete column improved weak soil under zero normal pressure has significant shear resistance than ordinary stone column improved weak soil. It is concluded that pervious concrete columns could be provided beneath the toe of the embankment for better shear performance. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.