Volume 1, Issue 1 — Year 2024 — Article e100010

ISSN (Online): 3115-8129 Biannually

A Numerical Investigation on the Surface Settlement due to Tunneling in Structured Fine-grained Soils

Article Type: Research
Pages: e100010
DOI: https://doi.org/10.22034/CGEL.1.1.e100010
Crossmark
Open Access
Authors
Affiliations
  1. Department of Civil Engineering, University of Roshdiyeh, Tabriz 5158464918, Iran
  2. Department of Civil Engineering, University of Roshdiyeh, Tabriz 5158464918, Iran
Corresponding author
Email: dr.h.azizi@roshdiyeh.ac.ir
ORCID: 0000-0002-2679-5003
Received: 5 July 2024 / Accepted: 20 July 2024 / Published: 25 August 2024
Abstract

Soil behavior can be categorized into two types: on-site soil behavior and reconstituted soil behavior in the lab. The stronger the soil structure, the greater the difference between these two behaviors. This structural strength results in a higher porosity at the same stress levels and divides soil behavior into elastic and plastic parts. To model structured soil behavior, various constitutive models have been developed, with many based on the cam-clay and modified cam-clay models. However, these models differ in integration and lack accuracy under varying stress levels. In this study, a modified cam-clay model is used to simulate structured clays. The model incorporates unstructured soil parameters and introduces modifications to account for hardening-softening behavior using initial yield pressure and other structured soil parameters. Simulations of triaxial tests show that the proposed model provides accurate predictions of structured soil behavior. Since most existing models in commercial software focus on unstructured soils, there has been limited research on practical problems involving structured soils. This paper applies the proposed model to 3D finite element software to study settlement due to tunnel drilling, showing excellent accuracy compared to other analytical methods.

Keywords

Structured soil, Cam-clay model, Finite element method, Tunnel drilling

Data availability statement

The data supporting the findings of this study are available within article. No publicly archived dataset was generated.

Funding

This research received no external funding.

Highlights
  • Modified cam-clay models structured soil behavior
  • Model captures hardening and softening effects
  • Accurate results for triaxial tests and tunnel settlement
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How to cite
Alamdari, N. S., & Pestehbaglo, H. R. A. (2024). A Numerical Investigation on the Surface Settlement due to Tunneling in Structured Fine-grained Soils. Civil and Geoengineering Letters, 1(1), e100010. https://doi.org/10.22034/CGEL.1.1.e100010
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