International Journal of Nonlinear Analysis and Applications

Designing the nonlinear Moore-Coulomb model and constant barometric module in the stabilization of deep excavation

Document Type : Research Paper

Author

Department of Structures, Earthquake and Geotechnics, Faculty of Civil Engineering, Architecture and Art, Science and Research Branch, Islamic Azad University, Tehran, Iran

Abstract

Determining the modulus of elasticity for soil is crucial in geotechnical engineering when conducting stress-deformation analyses. However, due to the difficulty involved in calculating this parameter, as well as the fact that the modulus of elasticity for soil is nonlinear in nature, there is often uncertainty surrounding its value. A study was therefore conducted to investigate these uncertainties and their impact on geotechnical analyses and plans. The study involved modeling and numerically analyzing a deep drilling guard structure using the anchoring method. To obtain the necessary information, two projects – depth and guard structure, which were both undertaken by Jahan Mall and Baran - in Mashhad were selected as case studies. In this study, the Jahan Mall project pit was analyzed using both two- and three-dimensional numerical models. Four different models were used: Moore-Coulomb (MC), hardening soil (HS), hardening soil with small strain stiffness (Cysoil HSS), and a newly developed nonlinear model based on the Moore-Coulomb model. To carry out the analysis, information obtained from barometric tests, standard penetration tests, and shear wave propagation was used. The results of the analysis were compared with each other and with the monitoring data. It was found that for the Moore-Coulomb behavior model, the pressure modulus (Ep) should be corrected to three to five times its original value in order to obtain accurate results. However, for the Cysoil HSS, HS models, and the newly developed model, there was no need to correct the pressurometric data or shear wave propagation. Additionally, it was determined that while no correction is necessary when using standard penetration numbers, an appropriate relationship should be used to convert them into the modulus of elasticity. Based on these findings, the Gud Baran project was analyzed, and it was concluded that the newly developed model and method for converting standard penetration numbers can be applied broadly and produce desirable results.

Keywords

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International Journal of Nonlinear Analysis and Applications
Volume 15, Issue 7
July 2024
Pages 215-226
  • Receive Date: 11 February 2023
  • Revise Date: 19 June 2023
  • Accept Date: 24 June 2023