1. Two-dimensional tunnel heading stability factors Fc, Fs and Fγ.
- Author
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Shiau, Jim and Al-Asadi, Fadhil
- Subjects
- *
BEARING capacity of soils , *TUNNELS , *FINITE element method , *INTERNAL friction , *FINITE differences - Abstract
This paper investigates the use of stability factors to estimate tunnel heading pressures. The primary method adopted is a conventional equation based on the soil property and stability factors, analogous to the bearing capacity factors (N c , N s and N γ) of strip footings. The finite element limit analysis (FELA) is employed to determine rigorous upper bound (UB) and lower bound (LB) solutions of stability factors (F c , F s and F γ), which are functions of the depth ratio (C/D) and soil internal friction angle (Ø). The obtained results are compared and validated by using the finite difference analysis as well as other available published results in the literature. A number of examples are illustrated on how to use the factors to estimate tunnel heading pressures. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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