10 PLAXIS Bulletin (S) - PLAXIS PLAXIS PLAXIS Editorial N...

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P LAXIS Bulletin of the PLAXIS Users Association (NL) Plaxis bulletin Plaxis B.V. P.O. Box 572 2600 AN Delft The Netherlands E-mail: [email protected] IN THIS ISSUE: Editorial Column Vermeer New developments Improved user services support Recent activities Plaxis Practice The role of OCR 12 Users forum 14 Agenda 16 P LAXIS Nº 10 - MARCH 2001 Editorial In April the newly developed 3D Tunnel program will officially be released . Many months were spent in testing the program, not only at the Delftech park office, but also by a group of Beta testers. The 3D Tunnel program is specifically intended to model tunnels such as shield tunnels (second Heinenoord Tunnel, see New Developments) and NATM tunnels. But the 3D Tunnel program allows other 3D situations to be modelled as well, such as the 3D excavation and installation of a diaphragm wall (M. de Kant, see Plaxis Practice). A short description of the 3D Tunnel program is provided in this bulletin. L ast year, in September, a Beta release of the 3D Tunnel program was presented at a users meeting. Besides a lecture on the (theoretical) background of the 3D Tunnel program, a hands-on exercise was given on a simple example problem. Further more it was shown that the PLAXIS 3D Tunnel program is certainly capable of other analyses beyond tunnelling. A case about the indentation of a tractor wheel in soft soil (University of Wageningen) and the excavation of a slurry wall were presented. Partial geometry of NATM tunnel Since the release of the Dynamics module last year users have been running dynamic analyses. As this is a new module of Plaxis, many users have to gain experience with it. Therefore, the Plaxis Users Association (NL) organised a well attended ‘Dynamics day’ with guest speakers Prof. dr. ir. A. Verruijt and T.K. Muller from IFCO. After these interesting lectures, hands-on exercises were conducted in the afternoon to exchange practical experience. Last January, during the course ‘Computational Geotechnics’ at Berkeley University (USA) a one day Dynamics course was introduced. Some 30 participants from this earthquake sensitive area were present. The analysis of flexible soil retaining walls is taken a step further. From Blum’s analysis and Winkler spring type models to an analysis in Plaxis. The approach of using a Finite Element method with an adequate soil model to analyse flexible soil retaining walls shows that some interesting results can be obtained (Column Vermeer). Since the Soft Soil Creep model has been implemented, questions have been asked about the role of OCR in the model. A practical example is given and preliminary conclusions are drawn in ‘The role of OCR in the SSC model’ see Plaxis Practice. Editorial staff: Martin de Kant, Plaxis Users Association (NL) Marco Hutteman, Plaxis Users Association (NL) Peter Brand, Plaxis bv Jan Gabe van der Weide, Plaxis bv Scientific Committee: Prof. Pieter Vermeer, Stuttgart University Dr. Ronald Brinkgreve, Plaxis bv 1
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P LAXIS Figure 1 Single-anchored wall with free earth support with 3 stages of
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