Author
Rajagopal Karpurapu
Other affiliations: Royal Military College of Canada
Bio: Rajagopal Karpurapu is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Geosynthetics & Finite element method. The author has an hindex of 8, co-authored 26 publications receiving 509 citations. Previous affiliations of Rajagopal Karpurapu include Royal Military College of Canada.
Papers
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TL;DR: In this paper, the results of a series of large-scale triaxial tests carried out on 200mm-high isolated geocell-soil composite specimens and unreinforced soil specimens were described.
Abstract: The paper describes the results of a series of large-scale triaxial tests carried out on 200-mm-high isolated geocell-soil composite specimens and unreinforced soil specimens. Two different aggregate soils were used in the test program. The reinforced specimens were tested with a height-to-diameter ratio of unity, which matches the dimensions of these systems in a typical base reinforcement application. The results illustrate the stiffening effect and strength increase imparted to the soil by the enhanced confinement effect. Comparison of reinforced and unreinforced soil specimens shows that the frictional resistance described by the peak friction angle of the soil infill is applicable to the composite structure as well. A simple elastic membrane model can be used to estimate the additional apparent cohesion present in the composite structure.
196 citations
TL;DR: In this article, the authors used finite element models to simulate the behaviour of two carefully constructed and monitored large-scale geosynthetic reinforced soil retaining walls, which were taken to collapse using a series of uniform surcharge loads applied at the sand fill surface.
155 citations
TL;DR: In this paper, the authors describe two sets of numerical simulations that were carried out to model the controlled yielding concept, using a finite element method together with a hyperbolic constitutive soil model, and generate preliminary design charts for the selection of stiffness and thickness of compressible layers placed against rigid walls retaining well-graded sand backfills compacted to a range of densities.
77 citations
TL;DR: In this article, the authors evaluated the interlayer bond strength between the asphalt pavement layers that is reinforced with a geosynthetic product impregnated with asphalt as a tack coat material.
34 citations
Journal Article•
25 citations
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TL;DR: In this paper, a numerical model was developed to simulate the response of three instrumented, full-scale, geosynthetic-reinforced soil walls under working stress conditions.
Abstract: The paper describes a numerical model that was developed to simulate the response of three instrumented, full-scale, geosynthetic-reinforced soil walls under working stress conditions. The walls we...
276 citations
TL;DR: In this article, the authors investigated the qualitative and quantitative improvement in load capacity of the stone column by encasement through a comprehensive parametric study using the finite element analysis and found that the encased stone columns have much higher load carrying capacities and undergo lesser compressions and lesser lateral bulging as compared to conventional stone columns.
264 citations
TL;DR: In this article, the construction and surcharge loading response of four full-scale reinforced-soil segmental retaining walls is simulated using the program FLAC, and the numerical model implementation is described and constitutive models for the component materials (i.e., modular block facing units, backfill and four different reinforcement materials) are presented.
Abstract: The construction and surcharge loading response of four full-scale reinforced-soil segmental retaining walls is simulated using the program FLAC. The numerical model implementation is described and constitutive models for the component materials (i.e., modular block facing units, backfill, and four different reinforcement materials) are presented. The influence of backfill compaction and reinforcement type on end-of-construction and surcharge loading response is investigated. Predicted response features of each test wall are compared against measured boundary loads, wall displacements, and reinforcement strain values. Physical test measurements are unique in the literature because they include a careful estimate of the reliability of measured data. Predictions capture important qualitative features of each of the four walls and in many instances the quantitative predictions are within measurement accuracy. Where predictions are poor, explanations are provided. The comprehensive and high quality physical data reported in this paper and the lessons learned by the writers are of value to researchers engaged in the development of numerical models to extend the limited available database of physical data for reinforced soil wall response.
258 citations
TL;DR: In this article, a large number of triaxial compression tests were performed on granular soil encased in single and multiple geocells to investigate the effect of the stiffness of the geocell on the overall performance of geocell-soil composite.
212 citations
TL;DR: In this paper, the effects of reinforcement form on strength improvement of geosynthetic-reinforced sand through triaxial compression tests were analyzed to understand the strength improvement due to reinforcement in different forms.
209 citations