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Kick-off meeting Amsterdam 1516-04-2002


									GEOTECHNET : 2nd Network Meeting : Madrid 25/26-11-2002 Short description of the results of the WP3 session on FEM & OM Members present at the WP3-Session G. Bachmann( TU Darmstadt), M. De Vos (BBRI), R. Frank (ENCP-CERMES),M. Fritsch (TU Braunschweig), J. Gatterman (IGB-TUBS), Gauthey (EFFC & Spie Fondations), P.B. Hansen (GEO), N. Huybrechts (BBRI), L. Jendeby (NCC), B. Klosinski (IBDiM), J. Maertens (Jan Maertens bvba), K. Nübel (Züblin), D. Patel (Arup), C. Sagaseta (Cantabria Univ.) 1. Introduction As introduction of the WP 3 session a short summary has been presented about the discussed items at the WP3-session of the Amsterdam kick-off meeting, which was organised in April 2002. Based on these discussions the work plan and the time schedule have been adopted.

2. Workplan & time schedule The new work plan approach can be summarised as follows: STEP 1  Collecting, analysing and summarizing data on: - Recommendations and guidelines FEM & OM use - Reports - Literature - Outcome of benchmarks - well documented case studies - websites, links, databases - organisations, working groups, activities - research activities  Drafting basic documents: - Part 1: Use of FEM in geotechnical engineering - Part 1: Use of OM in geotechnical engineering  Determining priorities for supplementary actions (see step 2). In order to support this an Inquiry will be organised. STEP 2  Based on priorities determined in STEP 1, organising focussed supplementary action (e.g. design exercise(s), benchmark(s))  Drafting of the final reports (part 1 and part 2) and formulation of recommendations for the use of FEM and OM in geotechnical engineering and needs for further research activities

Important aspects to realise these tasks are - to have a good and active cooperation within the WP3 mirror group, which is a group of WP3-interested Geotechnet members and associated members, and who wants to be informed about the WP3 activities, but who will also preferably be active in the WP3 work (providing information, comments on draft reports, …) - to have an efficient communication network in order to collect a maximum of data addressing WP3. Therefore a list with National Contact Points (NCPs) in Europe is being established. These national contact points can be network members themselves or other persons suggested by the network members (or possibly proposed by ISSMGE’s national member organisations). It will be asked to the NCP’s (and to all the GeoTechNet partners, and especially the WP3 mirror group) to look around in their country and to provide as much as possible information on existing reports and guidelines, literature, research, well-documented case studies, … addressing FEM and OM. The NCP’s will also be asked to distribute the WP3 inquiry in their country. - In order to control the quality of the collected and the analysed data, it was asked to prof. J. Maertens (B) and prof. C. Sagaseta (ES) to review in detail the established reports. The planning and time schedule of the WP3 activities is schematically presented in the next figure.
2002 Step 1 NCP's Collect & summarise data Organisation inquiry Basc doc. Part 1 - FEM Basic doc. Part 2 - OM Determining priorities Step 2 Suppl. Action (benchmarks, …) Final report 2003 2004 2005


Important milestones for 2003 are the Mid term draft reports Part 1 and Part 2, as well as the outcome of the inquiry.

3. Finite Element Methods 3.1. Presentation of the draft of the report “WP3 –Part 1 – use of FEM in geotechnical engineering – Basic document” M. De Vos (BBRI) presents this document that has been established based on the information available at the BBRI, and the information received from some colleagues. This report is a basic document, which should be elaborated further based on the information input from the network. The report is available on the website in the document exchange area of WP 3. To have access to this area members should apply for logon via the website!

3.2 Proposal for the organisation of an Inquiry It is proposed to organise an inquiry, in order to map the use of numerical programs in Europe, and the problems encountered by the users. The inquiry should first of all give information about the software which is commonly used and the soil models and ground parameters that are involved in these programs. The analysis of such an inquiry can be an important helping tool to determine priorities for further WP3 actions. A possible content of such an inquiry is proposed. The following questions are arised : - Should all numerical programs be considered or only FEM? - What about mixed programs? It is generally agreed to focus on FEM and finite differences method, but to include an extra clause on other programs, like subgrade reaction models. It is mentioned to include a question in the inquiry about the purpose of the use of FEM (ULS, SLS, back calculations) and to make the difference between design and research applications. It is also proposed to distribute the inquiry via the national contact points (NCP’s) after sending it for advice to the mirror group.

4. Observational Method 4.1. Proposition WP3 – Part 2: Use of OM in Geotechnical engineering – Basic document Similar to the document on FEM, a basic document on the use of OM in geotechnical engineering is being elaborated, and that based on the available information. An important starting document, which contains already a huge amount of information, is the CIRIA report 185 – “The observational method in ground engineering” The WP3-Part 2 basic document can start from the basic procedures in this report, and elaborate it with other reference documents. Furthermore, there will also be focussed on : - Instrumentation techniques (database WP1) - case studies (developing database?) - Interaction with other activities

4.2. Practical use of OM, recent case study D. Patel (Ove Arup) gives a presentation of a successful OM application in the UK, which led to important time and cost savings. The following points are mentioned: - A close link between OM and FEM should lead to a better understanding of FEM. - The observational method is not only about performing measurements; it is about taking engineering risks, which involves a lot of partners; - There is a need to assemble good case examples of use of OM (with FEM) from European partners in different geotechnical applications. This can stimulate the application of OM. - It is important to present case examples in a fixed (well structured) format. D. Patel proposes the (powerpoint) format he used his presentation.


As starting point Arup can pull together some examples (4 to 5) from own experience in this format. These examples will be put on the geotechnet website.

As the next Network meeting will be organised in November 2003, it will be necessary to organise an intermediate WP3 meeting. It is proposed to combine this possibly with the international BAP IV conference in June 2003 (Ghent, Belgium) and/or during the ECSMGE conference in Prague (August 2003). Possibly this meeting can be combined with a session of WP 2 on EC7.

5. Varia In Germany, a new recommendation document for the use of FEM will be published in January 2003. The German network partners M. Fritsch and J. Gatterman (IGB-TUBS) proposed to play an active role in the WP3 work, and to be involved in the databases addressing WP3

Actions on the short term - Establishment (complete) list of NCP’s - Examples OM-applications in fixed format on the website - Reviewing and completing basic document part 1 on FEM (continuous action) - Reviewing first draft of the basic document part 2 on OM and uploading it on the website - Organisation of an inquiry – to be distributed via Geotechnet network and NCP’s - Providing information : all Geotechnet partners, associated partners, NCP’s

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