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Abstract
2 D discontinuum analyses were performed with UDEC to investigate the influence
of block sizes and shapes on the deformation behaviour and stress development around tunnels. As the block shape changes different failure modes around the tunnel are observed. The block size and joint residual friction angle are other factors determining the failure mode. Within the same failure mode a decrease in the block size and slenderness of the block result in an increase in the displacements. A decrease in the residual friction angle of the joints increases displacements considerably. At high joint friction angles block wedging determines the displacement vector orientations. As the joint friction angle decreases the influence of shearing along the joints become more dominant. The effect of the block size on the displacement orientation is not significant for the same block shape up to a certain limit. Tangential stresses close to the sidewall generally are lower than those determined with the closed form solution. Tangential stresses at the crown are generally higher compared to the closed form solution due to a wedging effect between the blocks
of block sizes and shapes on the deformation behaviour and stress development around tunnels. As the block shape changes different failure modes around the tunnel are observed. The block size and joint residual friction angle are other factors determining the failure mode. Within the same failure mode a decrease in the block size and slenderness of the block result in an increase in the displacements. A decrease in the residual friction angle of the joints increases displacements considerably. At high joint friction angles block wedging determines the displacement vector orientations. As the joint friction angle decreases the influence of shearing along the joints become more dominant. The effect of the block size on the displacement orientation is not significant for the same block shape up to a certain limit. Tangential stresses close to the sidewall generally are lower than those determined with the closed form solution. Tangential stresses at the crown are generally higher compared to the closed form solution due to a wedging effect between the blocks
| Originalsprache | englisch |
|---|---|
| Titel | Rock Engineering - Theory and Practice |
| Untertitel | proceedings of the ISRM Regional Symposium EUROCK 2004 & 53rd Geomechanics Colloquy, October 7 - 9, 2004, Salzburg/Austria |
| Erscheinungsort | Essen |
| Herausgeber (Verlag) | VGE |
| Seiten | 695-700 |
| ISBN (Print) | 3-7739-5995-8 |
| Publikationsstatus | Veröffentlicht - 2004 |
| Veranstaltung | 2004 ISRM Regional Symposium Eurock: EUROCK 2004 - Salzburg, Österreich Dauer: 7 Okt. 2004 → 9 Okt. 2004 |
Konferenz
| Konferenz | 2004 ISRM Regional Symposium Eurock |
|---|---|
| Kurztitel | EUROCK 2004 |
| Land/Gebiet | Österreich |
| Ort | Salzburg |
| Zeitraum | 7/10/04 → 9/10/04 |
| Anderes |
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