This twenty-third manual in the GEO5 engineering series provides a detailed guide to analyzing the lining response of a mined collector using the Finite Element Method (FEM). The manual focuses on assessing the internal forces acting on the collector lining and evaluating its structural behavior under geostatic stress conditions. Available for download, this manual is an essential resource for geotechnical engineers involved in underground construction and tunnel lining design.

Learning Objective:

The goal of this manual is to teach users how to perform a comprehensive analysis of a mined collector’s lining using the FEM program in GEO5. Users will learn how to model the geometry of the collector, apply geostatic stress, and assess the internal forces and displacements in the lining to ensure its stability and structural integrity.

Assignment Description:

In this assignment, users are tasked with analyzing the lining of a mined collector located at a depth of 12.0 meters. The collector has a lining thickness of 0.1 meters made from reinforced concrete. The analysis includes setting up the problem with appropriate soil parameters, generating a finite element mesh, and evaluating the internal forces such as bending moments, shear forces, and normal compressive forces. The manual guides users through each step, including the verification of the yield condition using the Mohr-Coulomb material model.

Outcome:

Upon completing this assignment, users will be able to accurately model and analyze the internal forces and structural behavior of a mined collector’s lining using GEO5 FEM software. They will gain practical experience in refining the finite element mesh, interpreting results for internal forces, and ensuring that the collector’s lining meets the required safety and performance standards.

Conclusions:

The manual concludes that local refinement of the finite element mesh around the collector significantly improves the accuracy of the analysis results. The results also indicate that if the lining behaves elastically, as demonstrated by the zero values of equivalent plastic strains in the Mohr-Coulomb model, the internal forces and displacements are identical for both elastic and non-linear models. The manual emphasizes the importance of considering realistic construction stages to avoid unrealistic assumptions in the analysis.

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