Experimentelle Untersuchungen zum Stoffverhalten von konditionierten Mehrphasengemischen mit organischen Bestandteilen

This dissertation deals with the continuum-mechanical behavior of multi-phase mixtures, untreated soils with organic matters and treated soils with organic matters. Organic matter content in soils can determine the deformation behavior of soils totally. Soils with organic components such as peat are well known for their high compressibility. Depending on the content and degradation of the organic matter, as well as the resulting water content a correlation to the bearing capacity of the soil can be established. The aim of the performed investigations on multi-phase mixtures (soil/soil with bonding agent) within the scope of this dissertation is to establish the compression and shear behavior of soils with organic content after adding different fractions of binding agent. The ultimate target is to develop a high-performance building material/soil that can be utilized. Hence, three peats with different soil-mechanical properties were investigated to cover a wide range of parameters and to gain trusted results. The results show that it is possible to stabilize the peats by conditioning with cement, thus a peat layer can be stabilized through special ground engineering methods (e.g. Mixed-in-Place- or Mixed-in-Plant-Methods) to become stable construction ground. However, the precondition for the success is to carry out laboratory investigations on the conditioned soils to obtain their precise soil-mechanical properties. In doing so, the selection of the initial stress and the timing for load increase are of eminent importance for the future deformation behavior of the improved soils.In this dissertation a new far-reaching approach in construction ground design for soils with organic content is introduced – till now it was possible to apply such concepts on granular soils using Mixed-in-Place and other methods – utilizing conditioning methods to stabilize soils with organic content instead of excavating and depositing the soil on landfills for replacement or instead of constructing deep foundations. This would minimize the pressure on the cycle of materials.