Determination of Shear Strength Parameters Using Back Analysis and Comparing with Physical and Numerical Modeling

Document Type : Original Research Paper

Authors

1 School of Mining Engineering, College of Engineering, University of Tehran,

2 School of Mining Engineering, College of Engineering, University of Tehran

Abstract

Analyzing slope stability is one of the most important issues in civil engineering. Sliding failure is a common mode of instability that may occur in geotechnical projects. In this study, sliding failure is investigated using physical modeling, limit equilibrium, and finite element approaches. Phase2, as software written based on the finite element method (FEM), was used in this research. The GLE method for slope stability analysis, which is the most comprehensive method, has been employed. Three experimental tests were carried out through a tilting table device. The geotechnical properties such as cohesion and internal friction angle were achieved via back analysis. These parameters were obtained at 550 Pa and 28.5 degrees, applying sensitivity analyses, respectively. In the subsequent phase, the compromised slope underwent modeling employing the finite element method (FEM) with Phase2 software, wherein the back-calculated values of shear strength parameters were integrated. The comparison between numerical modeling and physical tests revealed a maximum error of 14 percent, a tolerable margin attributable to the intricacies inherent in the failure mechanism. The results unequivocally indicated that the failure was primarily governed by the shear mechanism. These findings attest to the efficacy of the proposed approach in examining slope stability and recommending investigating stabilization measures.

Keywords


Volume 1, Issue 1
March 2025
Pages 68-78
  • Receive Date: 23 January 2025
  • Revise Date: 19 February 2025
  • Accept Date: 22 March 2025
  • First Publish Date: 22 March 2025
  • Publish Date: 29 March 2025