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A framework for geotechnical characterization of dredged reservoir sediments and its sustainable reuse after stabilization

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Abstract

This paper presents the salient features of a study undertaken to characterize the geotechnical properties of dredged sediments from a typical reservoir in India by preparing GIS maps of geotechnical data based on the Inverse Distance Weighted technique. Potential of using the fine sediments (< 425 µm) of the dredged material after stabilization in earth work applications is subsequently examined through a series of compaction tests, UCC and CBR tests. The stabilizers used are Class C fly ash, hydrated lime and Ca-lignosulfonate. Results of the study indicate that the prepared spatial maps can serve as useful tools in proper planning of cost-effective dredging operation. The study also indicates that Class C fly ash, in general is a superior stabilizer among the various stabilizers considered for improving fine reservoir sediments, improvement in undrained shear strength and unsoaked CBR value being about fourfold and sixfold, respectively. However, hydrated lime is seen to be a more effective stabilizer than fly ash under sustained rainfall (soaked) condition. Addition of lignosulphonate is seen to improve the ductile nature of the stabilized dredged sediment without much loss of shear strength. SEM analysis provided deep insight into the flocculation and agglomeration mechanism and nature of the stabilized material.

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No funding was received for the research presented in this manuscript.

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The authors gratefully acknowledge the financial support by the AICTE under the National Doctoral Fellowship (NDF) scheme.

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Correspondence to S. Athira.

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Athira, S., Subaida, E.A. & Vinod, P. A framework for geotechnical characterization of dredged reservoir sediments and its sustainable reuse after stabilization. Environ Earth Sci 83, 152 (2024). https://doi.org/10.1007/s12665-024-11448-x

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  • DOI: https://doi.org/10.1007/s12665-024-11448-x

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