Characteristic of small-strain stiffness of fine-grained soils based on advanced laboratory tests
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Department of Building Structures, Geotechnics and Concrete, Building Research Institute, Filtrowa 1 St., 00-611 Warsaw, Poland
Building Research Institute, 21 Ksawerów St., 02-656 Warsaw
Department of Construction Materials Engineering and Geoengineering, Lublin University of Technology, Nadbystrzycka 40 St., 20-618 Lublin, Poland
Submission date: 2023-02-03
Acceptance date: 2023-03-21
Publication date: 2023-12-20
Archives of Civil Engineering 2023;4(4):73-88
The non-linearity of the modulus in the zone of small deformations has become one of the three basic concepts of modern soil mechanics, together with “effective stresses” or “critical state”. It is therefore necessary to obtain suitable parameters to describe these phenomena through the development of modern measuring equipment and newresearch methods. Limitations in the availability of the research area or research equipment indicate the need to create a data set, in the formula of regional assessments. The article presents a compilation of data on the deformation characteristics of soils covering about 75% of the country’s area, which are the most common subsoils for building. Descriptions, images of microstructures, and a record of mechanical parameters are presented for various age-old glacial clays and marginal clays and loesses. Emphasis is placed on parameters obtained from triaxial tests, including the determination of the shear modulus at small deformations obtained from BET measurements. In combination with the patented solution of sample strain measurement, complete deformability curves of the tested samples were obtained, indicating model reference curves developed for the above soil types. The statistically significant amount of data collected allowed the creation of a specific portfolio for selected soils as a starting point for assessing deformability. This corresponds to the current expectations regarding the characteristics of the behaviour of the substrate in the full spectrum of stresses and deformations, obtained from different types of tests, which, as in the case of soil stiffness degradation, together allow the correct determination of the necessary parameters.
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