Elasto-plastic analysis of a multi-stage excavation in bonded geomaterials

Hamed Moghaddasi*, Arman Khoshghalb

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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Abstract

The deformation characteristics of braced and unbraced excavations in a dry structured soil are investigated numerically. A constitutive model based on the theory of bounding surface plasticity is used to predict the plastic deformation of the soil. A plastic cementation index is introduced in the hardening modules to capture soil degradation. In the model, the progress of the degradation is associated with the stress magnitude and the accumulated plastic deformation. The constitutive model is implemented in a finite difference code to analyse the lateral deformation of braced and unbraced excavations. The implemented model captures the strength increase of soils due to cementation, and predicts the subsequent debonding and strength degradation due to excavation. It is shown that soil cementation significantly influences the compression and tensile strengths of soils, and alters the deformation profile of the excavated face.

Original languageEnglish
Title of host publication7th International Symposium on Deformation Characteristics of Geomaterials, IS-Glasgow 2019
EditorsErdin Ibraim, Alessandro Tarantino
PublisherEDP Sciences
Number of pages6
Volume92
ISBN (Electronic)9782759890644
DOIs
Publication statusPublished - 25 Jun 2019
Event7th International Symposium on Deformation Characteristics of Geomaterials, IS-Glasgow 2019 - Glasgow, United Kingdom
Duration: 26 Jun 201928 Jun 2019

Publication series

NameE3S Web of Conferences
Volume92
ISSN (Print)2555-0403
ISSN (Electronic)2267-1242

Conference

Conference7th International Symposium on Deformation Characteristics of Geomaterials, IS-Glasgow 2019
Country/TerritoryUnited Kingdom
CityGlasgow
Period26/06/1928/06/19

Keywords

  • numerical modelling
  • THCM coupling
  • localisation
  • boundary value problems
  • bonded geomaterials
  • plastic cementation index
  • unbraced excavations
  • braced excavations
  • debonding
  • strength degradation

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