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The influence of different stress states on soil liquefaction under a building

Abstract:

Liquefaction of soil depends on the state and type of soil, loading function and the initial stress state of a soil element prior to a dynamic event. Most studies focus on an initial stress state from the free field while assuming s2 = s3. Therefore, this stress state can be studied in a triaxial apparatus. With a hollow cylinder apparatus, it is possible to apply any possible combination of s1, s2 and s3 in the soil prior to testing and thus enables the reproduction of boundary conditions e.g. as given for different soil elements under a building. Underneath a building different initial stress states need to be taken into account to judge the safety and the behavior of the building during and after an earthquake. The focus in this contribution is to study the influence of these stress states. For a typical building the initial stress states were chosen at three locations in a depth of 5 m. Experiments with fine sand are carried out under these initial stress states with combined cyclic shear and axial loading. The results are presented and discussed in terms of the influence of stress state on liquefaction susceptibility and potential failures modes of a building type to be considered in soil structure interaction. Keywords: soil liquefaction, hollow cylinder apparatus, initial stress state, fine sand, soil structure interaction

Authors:

Buchheister, Juliane and Laue, Jan

Index Terms:

SoilGroup; soil liquefaction; hollow cylinder apparatus; initial stress state; fine sand; soil structure interaction; Buchheister, Juliane; Laue, Jan

Further Information:

Date published: 25.06.2007