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Large strain correction for tunnel analyses considering hydromechanical coupling and ground anisotropy
Matteo Natale1, Alexandros N Nordas2, Seraina Kopp1
1ETH Zurich, Stefano-Franscini-Platz 5, 8093, Zurich, Switzerland.
Scientific Reports
|September 26, 2023
Summary
Tunnel analyses for squeezing ground can use a simple correction equation to accurately estimate large deformations. This method is effective for preliminary design calculations, even with complex material behaviors and coupled analyses.
Area of Science:
- Geotechnical Engineering
- Tunneling Engineering
- Computational Geomechanics
Background:
- Large ground deformations in tunnels necessitate advanced numerical methods considering geometric nonlinearity.
- Small strain analyses offer a simpler alternative but require corrections for significant deformations.
Purpose of the Study:
- To validate the accuracy of a hyperbolic correction equation for large strain tunnel analyses.
- To assess the equation's applicability to anisotropic materials and coupled hydro-mechanical conditions.
Main Methods:
- Numerical analysis of tunnels in squeezing ground.
- Application and evaluation of a hyperbolic correction for large strain estimation.
- Comparison of corrected small strain results with large strain predictions.
Main Results:
- The hyperbolic correction equation provides sufficiently accurate results for practical tunnel deformation prediction.
- The equation remains accurate for anisotropic material behavior.
- Satisfactory accuracy was observed for steady-state and transient hydromechanically coupled analyses.
Conclusions:
- The hyperbolic correction equation is a valuable tool for preliminary tunnel design, simplifying the analysis of large deformations.
- The method's accuracy is broadly applicable across various complex tunneling scenarios.
- This approach enhances the efficiency of preliminary design calculations for tunnels in squeezing ground.
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