Abstract
The paper deals with the determination of the optimum round length for weak rock tunneling in shallow or medium depth. The behaviour modes of the face and unsupported span were investigated by small scale model tests and PFC3D analyses. Using the concept of relative shear stress, FDM analyses were performed to formulate the safety factor for the face stability. This safety factor is also adopted as an indicator for the behaviour modes of the unsupported span. A conditional chart was established to determine the behaviour modes as the round length varies. By use of this conditional chart and detail construction information, the optimization of the round length can be performed in the design stage
| Original language | English |
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| Title of host publication | Rock Mechanics in Underground Construction |
| Subtitle of host publication | ISRM International Symposium 2006; 4th Asian Rock Mechanics Symposium, 8 - 10 November 2006, Singapore |
| Place of Publication | Singapore |
| Publisher | World Scientific |
| Pages | 118-118 |
| ISBN (Electronic) | 981270437X |
| Publication status | Published - 2006 |
| Event | 2006 ISRM International Symposium: ISRM 2006 - Singapur, Singapore Duration: 8 Nov 2006 → 10 Nov 2006 |
Conference
| Conference | 2006 ISRM International Symposium |
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| Abbreviated title | ISRM 2006 |
| Country/Territory | Singapore |
| City | Singapur |
| Period | 8/11/06 → 10/11/06 |