The Necessity of The Consideration of Permeability Modifier in Simulations of Clay Treatment Systems Incorporating PVDs and Surcharge

Document Type : Original Article

Authors

1 Ph.D. candidate, Department of geotechnical engineering, Estahban Branch, Islamic Azad University, Estahban, Iran.

2 Associate professor, Department of Water Engineering, Faculty of Agriculture, Shiraz University, Shiraz, Iran.

3 Associate professor, Department of geotechnical engineering, Estahban Branch, Islamic Azad University, Estahban, Iran.

4 M.Sc. student, Department of geotechnical engineering, Estahban Branch, Islamic Azad University, Estahban, Iran.

Abstract

Three trial embankments as TS1, TS2, and TS3 that were built for the investigation of a soil treatment project in Bangkok were modeled and verified based on the reported data. To clarify the importance of integration of the hydraulic modifier function vs stress, in the verified models, the modifier functions were omitted and the FEM models were run in the absence of the function. It was shown that after the omission of the hydraulic modifier, the results were overestimated especially for the TS1 and TS2, which had smaller PVDs (prefabricated vertical drains) distance. For the TS1 embankment, the settlement increased from 0.78 m to 0.87 m in 210 days. In 365 days, the settlement increased from 1.27 m to 1.44 m. For the TS2 embankment, the settlement increased from 0.93 m to 1.67 m in 230 days. In 410 days, the settlement increased from 1.36 m to 2.27 m. For the TS3 embankment, the settlement increased from 1.15 m to 1.79 m in 230 days. In 410 days, the settlement increased from 1.52 m to 2.24 m. The inclusion of the hydraulic function that calibrates the model for every step of loading is essential in the modelling such problems. For the design phase, this function should be calculated from lab tests, preferably undisturbed samples that were bored from the site, and the resultant function be used as an inseparable part of modeling and calculations.

Keywords

Main Subjects

Copyright © 2023  Mohammad Mehdi Pardsouie. This is an open access paper distributed under the Creative Commons Attribution License. Journal of Civil Engineering and Materials Application is published by Pendar Pub; Journal p-ISSN 2676-332X; Journal e-ISSN 2588-2880.

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Journal of Civil Engineering and Materials Application
Volume 7, Issue 2
June 2023
Pages 95-108

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History

  • Receive Date: 30 July 2022
  • Revise Date: 23 February 2023
  • Accept Date: 03 May 2023

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