December 2007
The increasing availability of computers running a 64-bit architecture is beginning to be felt in the world of numerical modeling. We are pleased to announce that the upcoming releases of 3DEC 4.1, PFC2D 4.0 and PFC3D 4.0 will all provide 64-bit versions alongside the 32-bit code. Since the new architecture provides models of practically unlimited size, one previous restriction on modeling capability is removed although processing speed is still a factor that might prevent contemplation of gigantic models. For an example of work done using the pre-release of PFC3D 4.0, see the writeup on our web site.
Roger Hart, Director of Software Services
The Gotthard Base Tunnel (GBT) in Switzerland, a double tube single track railway tunnel with a length of 57 km, is currently under construction. In addition to the northern and southern portals, the tunnel is being excavated from three intermediate approaches. Two of these intermediate approaches are constructed as so-called multifunction stations (MFS) for the purpose of containing facilities for operation control and emergency stations. The tunnels' crossovers and the galleries for ventilation and rescue form a complex tunnel system (Fig. 1). ITASCA Consultants GmbH, Germany, has contributed with numerical modelling to investigate the static and dynamic behaviour of the MFS Faido in co-operation with AMBERG ENGINEERING AG (Switzerland).
During the construction an unexpected fault zone was encountered giving rise to high loads and small dynamic events. To investigate these phenomena AMBERG ENGINEERING AG has performed 2D numerical modeling with UDEC. These simulations were later extended into 3D by ITASCA Consultants GmbH using 3DEC. Figure 2 shows the model layout indicating the geological layering and the critical fault zone. The location of the seismic source is indicated in Fig. 3
The modeling has given deeper insight into the origin of heavy support loading and dynamic events and has demonstrated that the applied support measures are sufficient.
In addition to a complete description of the new features available in PFC2D/PFC3D 4.0, there is now additional information available on some of the codes' most important new features. Visit the pages on the 64-bit version, the PFC3D-CCFD fluid analysis option, smooth-joint contact model, and the Enhanced Fishtank to get a full overview of the advancements these new features bring to the codes.
Itasca Australia is holding a FLAC Training Course on December 3-5, 2007 and a FLAC3D Training Course on December 6-7, 2007. Both training courses will occur in Melbourne, Australia, and will include discussions on the basic concepts and modeling principles for geotechnical numerical analysis including: grid generation, application of boundary conditions, selection of appropriate constitutive (material) models, solution of the static equilibrium state, simulation of construction stages, installation of structural support, and inclusion of either transient or steady groundwater flow states. Example applications of FLAC and FLAC3D for analysis of practical geotechnical problems will also be illustrated. Both courses will be taught by Dr. Roger Hart. For more information, please contact Itasca Australia.
FLAC | April 7-9, 2008 |
FLAC3D* | April 14-16, 2008 |
3DShop | April 21-23, 2008 |
UDEC | April 28-30, 2008 |
3DEC* | May 5-7, 2008 |
PFC | May 12-15, 2008 |
Literature by HCItasca personnel recently published or acquired in the HCItasca library.
Aglawe, J. P., and A. G. Corkum. "Application of Distinct Element Analysis in Slope Stability Problems," presented at the Indo-Norwegian Workshop on Seismic Hazard and Risk Assessment (New Delhi, India, March 2006).
Gaffney, E. S., B. Damjanac and G. A. Valentine. "Localization of Volcanic Activity: 2. Effects of Pre-Existing Structure," EPSL, 263, 323-338 (2007).
Hausdorf, A., F. Heinrich, H. Konietzky and N. Mocka. "Numerische Untersuchungen zur Stabilität Geschichteter und Geankerter Kammerfirsten im Kalibergbau (Numerical Studies on the Stability of Bedded and Anchored Roofs in Potash Mining, in German)," Kali & Steinsalz, 1, 20-25 (2007).
Lorig, L. J., A. D. Watson and C. D. Martin. "Rockslide Run-Out Prediction from Distinct Element Analysis," in DEM 07, CD Proceedings of the Discrete Element Model-ling Conference (Brisbane, August 27-29, 2007). Minerals Engineering International, 2007.
Mas Ivars, D., M. Pierce, D. O. Potyondy and P. A. Cundall. "A New Modelling Approach for the Study of Deformation, Yield and Failure of Jointed Rock Masses," in Bergmekanikdag 2007 (Swedish Rock Mechanics Day 2007), pp. 33-41. Stockholm: SveBeFo, 2007.
Potyondy, D. O. "The Effect of Voids on the Mechanical Properties of Rock," in DEM 07, CD Proceedings of the Discrete Element Modelling Conference (Brisbane, August 27-29, 2007). Minerals Engineering International, 2007.
Sainsbury, D. P., and M. B. Revell. "Executive Summary: Advancing Paste-Fill Bulk-head Design Using Numerical Modeling," CIM Mag., 2(5), 81 (2007).
Shimizu, Y. "The DEM Simulations Including Natural and Forced Convection Heat Transfer and Conduction Heat Transfer," in DEM 07, CD Proceedings of the Discrete Element Modelling Conference (Brisbane, August 27-29, 2007).