Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
Browse
4 results
Search Results
Item Design and Development of Efficient Under-Drainage System for Lined Canals(Springer Science and Business Media Deutschland GmbH, 2021) Sharma, A.; Das, B.B.Under-drainage system for lined canal is present beneath the canal bed to drain off the water present over there. It consists of longitudinal and transverse perforated drain pipes along with the arrangement of pressure relief valves. Cases of failure of lining of canal are there due to inconsistency in under-drainage system. Performance of geocell is exceptionally well in soil compaction, slope stabilization, earth retention and as reinforcement in case of retaining structure, road construction and railway embankments. Contrary to other researches, here performance of geocell as reinforcement of buried pipe under canal bed is investigated. Experimental study is carried out on canal model and on an under-drainage system. Strain in the buried pipe is observed due to application of various loading patterns on canal model. For sustained loading, 29% increase in strain is observed in pipe buried in unreinforced soil as compared to 18% in pipe buried in reinforced soil. For maximum loading almost three times more strain is stored in pipe in unreinforced soil. Yield is also observed in pipe without geocell, whereas at same loading no such behaviour is observed in pipe with geocell. It is reported that geocell can act as reinforcement for buried drain pipes under canal bed, and this helps in making under-drainage system efficient. © 2021, Springer Nature Singapore Pte Ltd.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 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 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.