Deformation Properties of Stabilized Soil Columns

The quantitative assessment of the deformation behaviour of fine-grained soils, improved by deep mixing, is important for the analysis of many geotechnical and earthquake engineering problems. Only limited information is available on the dynamic and static deformation properties, in spite of their importance for geotechnical design. The paper presents the results of extensive seismic and static investigations on soil improved by dry mixing. Seismic methods are described, which can be used in the field and in the laboratory for the determination of the shear wave velocity at small strains. The effects of strain rate and shear strain level on the soil modulus are discussed. Based on the results of extensive field and laboratory tests, recommendations are given regarding the assessment of the deformation modulus at static and dynamic loading.