Under Central European climatic conditions, soils
are usually either saturated or partially saturated.
For this reason, geotechnical questions always concern the coupled deformation
and flow processes between the pore fluids water and gas and the
soil skeleton. These questions are of great practical geotechnical interest and
play an important role in, for example, coastal protection facilities,
swelling and shrinkage behaviour of soils or the investigation of
the stability of embankments; they are treated in general by constitutive
models. These models take into account the mechanical effects of the
fluid phases without, however, considering their individual motion
functions. Although the standard models in soil mechanics suffice to treat
many of the practically relevant geotechnical tasks quantitatively, there are still large
deficits in theoretical knowledge, preventing the use
of modern simulation methods for solving practical questions in
geotechnics and tunneling.
The research group Mechanics of Partially Saturated Soils has set itself the goal of
treating partially saturated soils as a triphasic material consisting of a
deformable solid skeleton whose pore space is filled with pore water and
pore gas. To describe the influence of the pore fluids on the mechanical
behaviour of the soil, experiments need to be carried out. The
experimental results are used both for the identification of the material
parameters of constitutive models as well as for the verification of the material
models generated in the scope of the Theory of Porous Media (TPM).
Beside the description of elasto-plastic or elasto-viscoplastic solid
deformations, the models describe phase-exchange processes between the
pore fluids as well as swelling and shrinkage effects of the skeleton.
- Project I
Soils as a Triphasic Model Based on the Theory of Porous Media
Prof. Dr.-Ing. Wolfgang Ehlers, Dipl.-Ing. Tobias Graf
University of Stuttgart, Institute of Applied Mechanics (CE)
- Project II
Experimental and Theoretical Investigation of Partially Saturated Granular
- Project III
Modelling of Non-Isothermal Gas-Water
Flow and Transport Processes in Cohesive Soils
Prof. Dr.-Ing. Rainer Helmig, Dr.-Ing. Holger Class, Dipl.-Geoökol.
University of Stuttgart, Institute of Hydraulic Engineering
- Project IV
Model of Partially Saturated Cohesive Soils with Time-Dependent Humidity
and Temperature Flow
Prof. Dr.-Ing. Helmut Meißner, Dr.-Ing. Andreas Becker, Dipl.-Ing.
Markus Dobrowolsky, Dipl.-Ing. Peter Kierzkowski, Dipl.-Ing. Viktoria
University of Kaiserslautern, Institute of Soil Mechanics and Foundation
Dates & Events