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Stability analysis of a railway embankment on a collapsible-dispersive stratum under transient flow

Ahmadi, M. M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. Publisher: Asian Regional Conference on Soil Mechanics and Geotechnical Engineering , 2020
  3. Abstract:
  4. Collapsible-dispersive soil is one of the most challenging types of problematic soils having the adverse effects of both collapsible and dispersive soils for construction. A natural occurrence of this type of soil was recently encountered along some part of the Chabahar-Zahedan railway line in Southeast of Iran. Indeed, the construction phase was stopped after facing several geotechnical problems along the railway embankment partly constructed such as local and general subsidence, non-uniform settlements of structural elements, etc. Relatively high natural porosity as well as pore water salinity were found responsible for those problems. Therefore, this study aims to conduct a three-phase numerical study to investigate the effect of dispersion potential on the stability of the railway embankment. Results of numerical simulations are compared and discussed for two types of collapsible soil with and without dispersion potential. Results reveal a notable reduction in factor of safety with an increase in pore water salinity. It is postulated that the reduced factor of safety in the saline soil can be attributed to its higher unsaturated hydraulic conductivity compared with that of desalinated the soil. Copyright © Soil Mechanics and Geotechnical Engineering, ARC 2019.All rights reserved
  5. Keywords:
  6. Collapsible ; Dispersive ; Numerical modeling ; Slope stability ; Unsaturated soils ; Dispersions ; Embankments ; Geotechnical engineering ; Railroads ; Safety factor ; Soil mechanics ; Water ; Construction phase ; Dispersive soils ; Geotechnical problems ; Pore water salinities ; Railway embankment ; Stability analysis ; Structural elements ; Unsaturated hydraulic conductivity ; Soils
  7. Source: 16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2019, 14 October 2019 through 18 October 2019 ; 2020
  8. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85084944732&partnerID=40&md5=c50d959908f7876cd35c288741bf3d10