Abstract:
The interaction between pile and soil in open-ended piles and a derivation of the resulting influences on
plug formation up to now is only discussed in isolated cases. Especially, the water content related soil
mechanics with respect to cohesive soils show a special challenge to empirical investigations for both insitu and laboratory conditions. However, the quality of such investigations is the basis for a reliable
theoretical material model formulation. This study discusses the needs and gaps of the pile-soil interaction
by means of theoretical models, empirical studies and numerical as well as analytical methods quantifying
the stress-dependency with respect to plug formation in cohesive soils. In addition, a suggested laboratory
method quantifies the stress-dependent pile-soil interaction by measuring the torsional moment and axial
stresses. The study discusses the surface friction between soil and smooth steel as a function of water
content and consolidation in granular and cohesive soils. The results allow a trend between surface friction
and soil mechanics. The test apparatus and procedure will be further developed in future studies.