Abstract
In weak rock or under high overburden, considerable displacements occur during excavation of tunnels and galleries. The strains developing in many cases exceed the deformability of standard linings, frequently leading to severe damages and the necessity of costly repairs. To allow for a safe and economical tunnel construction, strategies have to be used, which
guarantee support characteristics compatible with the strains, and at the same time utilize the supports as much as possible.
After a review of traditional methods, mainly used in mining in the past recent developments to deal with high displacements in combination with modern standard supports, such as shotcrete and rock bolts are shown. The different systems currently available
are critically reviewed. For the design of such supports the development of the expected displacements must be predicted and the time dependent properties of shotcrete considered. Special tools have been developed to predict displacements.
A relatively simple analysis method to design shotcrete linings with integrated steel elements, based on predicted displacements and the transient lining properties is used to demonstrate the effectiveness and practical applicability of the various systems available
guarantee support characteristics compatible with the strains, and at the same time utilize the supports as much as possible.
After a review of traditional methods, mainly used in mining in the past recent developments to deal with high displacements in combination with modern standard supports, such as shotcrete and rock bolts are shown. The different systems currently available
are critically reviewed. For the design of such supports the development of the expected displacements must be predicted and the time dependent properties of shotcrete considered. Special tools have been developed to predict displacements.
A relatively simple analysis method to design shotcrete linings with integrated steel elements, based on predicted displacements and the transient lining properties is used to demonstrate the effectiveness and practical applicability of the various systems available
| Original language | English |
|---|---|
| Title of host publication | San Francisco 2008, 42nd US Rock Mechanics Symposium, 2nd US-Canada Rock Mechanics Symposium, June 29-July2, 2008, Westin San Francisco Market Street |
| Subtitle of host publication | Proceedings CD |
| Place of Publication | San Francisco |
| Publisher | American Rock Mechanics Association |
| Number of pages | 7 |
| Publication status | Published - 2008 |
| Event | 42nd U.S. Rock Mechanics Conference - San Francisco, United States Duration: 29 Jun 2008 → 3 Jul 2008 |
Conference
| Conference | 42nd U.S. Rock Mechanics Conference |
|---|---|
| Country/Territory | United States |
| City | San Francisco |
| Period | 29/06/08 → 3/07/08 |
Treatment code (Nähere Zuordnung)
- Application
- Theoretical
- Experimental