OasisLMS

This study presents Class-A prediction of the behavior of a railway embankment constructed over an improved soft organic clay soil of Khulna, southwestern part of Bangladesh. The embankment has been constructed for Khulna-Mongla port railway project which is single line broad-gauge track; the height of the embankment ranges from 5 to 13m and construction time is more than 1000 days. To capture accurate prediction of the embankment behavior, actual filling sequence with monitored settlement data has been be employed in numerical modelling. For the prediction of Class-A, the geotechnical investigation data have used for KUET-2022 and ircon-2017. The soft soil creep (SSC) model has been employed for the organic clay layers, the soft soil (SS) model for soft clay layers and Mohr-Coulomb (MC) model for sand layers in PLAXIS 2D. The material parameters of constitutive models have been derived based on the laboratory, field tests and the well-established correlations. From the numerical modelling, the discrepancies have been observed only 13% from the field data and laboratory tests data in 2022. The outcomes lead to confirm that the validity of well-established co-relations, appropriate selection of constitutive models and soil stratigraphy thickness etc.

Mahabub Sadiq, Khulna University of Engineering & Technology (KUET),Bangladesh; Tirthankar Jana, Ircon International Limited; Mohammad Shahidul Islam, Bangladesh University of Engineering & Technology

International Conference Proceedings