Abstract
This paper presents a numerical analysis of swelling deformations in the
Pfaendertunnel near Bregenz/Austria, which is a well-known example for swelling in
claystones. The constitutive model used in this study employs a semi-logarithmic
reduction of swelling strains with stress level and exponential convergence with final
swelling strains over time. Input swelling parameters for the analysis were derived
from laboratory swelling tests. Due to the wide range of experimental results, upper
and lower bounds of swelling parameters were used in the analysis. Calculated invert
heave was in particular sensitive to the choice of the maximum swelling pressure,
which governs both the swelling strain at stress point level and the size of the swelling
zone below the tunnel invert. Good match with the in situ measurements was obtained
for a maximum swelling pressure of 1500 kPa, which represents the upper edge of the
experimental values and is significantly lower than the overburden pressure of about
4900 kPa.
Pfaendertunnel near Bregenz/Austria, which is a well-known example for swelling in
claystones. The constitutive model used in this study employs a semi-logarithmic
reduction of swelling strains with stress level and exponential convergence with final
swelling strains over time. Input swelling parameters for the analysis were derived
from laboratory swelling tests. Due to the wide range of experimental results, upper
and lower bounds of swelling parameters were used in the analysis. Calculated invert
heave was in particular sensitive to the choice of the maximum swelling pressure,
which governs both the swelling strain at stress point level and the size of the swelling
zone below the tunnel invert. Good match with the in situ measurements was obtained
for a maximum swelling pressure of 1500 kPa, which represents the upper edge of the
experimental values and is significantly lower than the overburden pressure of about
4900 kPa.
| Original language | English |
|---|---|
| Title of host publication | Computational Methods in Tunnelling and Subsurface Engineering |
| Subtitle of host publication | proceedings of the Third International Conference on Computational Methods in Tunnelling and Subsurface Engineering, Ruhr University Bochum, April 17 - 19, 2013 |
| Place of Publication | Freiburg |
| Publisher | Aedificatio Publishers |
| Pages | 429-436 |
| ISBN (Print) | 978-3-942052-01-6 |
| Publication status | Published - 2013 |
| Event | 3rd International Conference on Computational Methods in Tunnelling and Subsurface Engineering : Euro:Tun 2013 - Bochum, Germany Duration: 17 Apr 2013 → 19 Apr 2013 |
Conference
| Conference | 3rd International Conference on Computational Methods in Tunnelling and Subsurface Engineering |
|---|---|
| Abbreviated title | Euro:Tun 2013 |
| Country/Territory | Germany |
| City | Bochum |
| Period | 17/04/13 → 19/04/13 |
Fields of Expertise
- Advanced Materials Science
Treatment code (Nähere Zuordnung)
- Theoretical