- Numerical Applications -

18, 19, 20 February 1998 in INNSBRUCK, Tirol, Austria.

Developments and Perspectives of Hypoplasticity


The announced Euroconference (to be followed by a meeting in 1999) aims to exchange information mainly on numerical applications of hypoplastic constitutive equations. This information refers to calibration, discretization, boundary conditions, FEM codes, equation solvers, time integration, meshes, localization, etc.

The meeting is planned to take place in the workers union's guest-house at Innsbruck. This guest-house is situated in a mountain forest in a distance of only 5 km from Innsbruck down-town. The meeting will be kept as far as possible informal in order to guarantee a free exchange of opinions. The number of participants is limited to ca. 40.

The last meeting in 1999 will be given a larger publicity and participation and is conceived as a state-of-the-art presentation of our co-ordinated efforts and results to the scientific community. It is planned to take place in the Greek village of Horton (where several scientific and cultural meetings have already been successfully held).

The EU encourages the participation of the following groups:
- researchers aged 35 years or under
- researchers whose place of work is in a less-favoured EU-region
- women researchers
- researchers who work in industry


The mechanical behaviour of geomaterials and granular materials governs many problems not only in civil engineering (geotechnics, tunnelling, coastal engineering, off-shore constructions) but also in petroleum engineering and mining as well as in the chemical industry (silos and transportation equipment). In the 80s a new type of models to describe this behaviour has emerged. This model has been given the name Hypoplasticity. In the meanwhile, many scientists have improved the original model and investigated particular aspects.

Hypoplasticity has been formulated based on the principles of rational mechanics and lacks the several superstructure notions of the classical theory of plasticity (such as yield and bound surfaces, normality rule etc.). Instead, it represents the mathematical model as a single tensorial equation holding equally for loading and unloading. Its main advantages are simplicity and easy calibration. A series of works has been carried out referring to experimental corroboration, finite-element applications, prediction of localisation, extensions for viscous and Cosserat-materials, implications on controllability and stability of tests, cyclic phenomena, wave propagation and hidden relations to classical elastoplasticity.


(tentative programme)

Bauer: Influence of density on plane strain problems
Bliem: Applications in tunnelling
Charlier: Strain localisation modelling with the CLoE constitutive law
Cudmani: Cavity expansion in cohesionless soil
Darve + Roguiez + Pal: Finite elements computations with a new incrementally non-linear constitutive relation
Desrues: Strategies for parameter determination for the application of a CLoE model to real geomaterials
Fiedler: Soil structure interaction for footings
Gudehus: Asymptotic state fields of granular bodies
Hügel: FEM-prediction of a sheet pile wall behaviour
Karcher: Slope stability analysis
Mayer: FEM-calculation of a slurry wall with embedded sheet piles
Roddeman: Direct shear test-numerical simulation
Schünemann: Numerical simulation of resonant column tests with multigrid method
Tamagnini: Application of CLoE to the analysis of soil-structure interaction in an excavation in sand supported by concrete retaining wall
Viggiani: Performance of different stress point algorithms for the integration of hypoplastic constitutive equations for geomaterials
Wehr: Sand anchors - numerical simulations
v. Wolffersdorff: FEM-prediction of retaining walls
Wu: Investigation of rapid cavity expansion


The accomodation in the workers union's guest house in Innsbruck from 17.02.98 evening to 21.02.98 evening including breakfast, lunch and dinner costs ATS 2.400.- (ATS 600,--/night).


The participition fee amounts ATS 1.000.-. The fee must be transferred after acceptance of participation.


Owing to the status of a EUROCONFERENCE funded by the European Commission (TMR-Programme) we can envisage to reimbourse a large part of travel and accommodation costs of EU-citizens working in an EU-country if they are not elder than 35. The final amount of support can be determined after completion of the participation list. In addition we will be able to reimbourse the travel and accomodation expenses of the speakers if they are EU-citizens and work in an EU-country.

Reimboursement of travel costs can be only undertaken if the tickets (cheapest economy class air fare or second class train fare or bus fare) will be presented or if the actual costs do not exceed the aforementioned costs


30. November 1997


Professor Dimitrios Kolymbas
Institute of Geotechnics and Tunnelling
Innsbruck University
Techniker Str. 13
A-6020 Innsbruck, AUSTRIA

fax: +43/512/507-2296