Numerical modeling and laboratory study of layered Gypsum-Concrete specimens with joints

Articles in Press

Document Type : Article

Author

Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran

10.24200/sci.2025.65020.9254

Abstract

The presence of joints and defects around openings contributes to the instability of these flaws. In nature, rocks and concrete materials are often layered, anisotropic, and contain numerous joints. This article discusses laboratory preparation and testing of layered gypsum-concrete specimens with varying geometries. Specifically, single joints above the openings were created at different angles and subsequently tested. The study focused on the instability and failure of the specimens in relation to the angularity of joints, anisotropy, and the geometry of the openings. Additionally, numerical modeling of the tested specimens was conducted using ABAQUS software to analyze the behavior of the openings when interacting with joints or faults. To ensure accuracy, ABAQUS was calibrated using data from uniaxial compression tests. The modeled specimens were then examined under uniaxial compression conditions, incorporating various opening configurations with joints. The findings indicated that tensile cracks were the most prevalent mode of failure in these modeled specimens. Notably, as the distance from the tunnel roof to the joint increased, its impact on tunnel instability diminished due to an increase in failure stress.

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Scientia Iranica

Articles in Press, Accepted Manuscript
Available Online from 27 January 2025

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History

  • Receive Date: 27 July 2024
  • Revise Date: 11 December 2024
  • Accept Date: 27 January 2025

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