Abstract
This paper presents the findings of a laboratory study of the shear strength and yielding behavior of two glacial till soil deposits from the area of Heiligenhafen, northern Germany. The tests were conducted on reconstituted forms of the soils using a triaxial cell capable of controlling the temperature of the specimens. The experimental program included a series of multi-stage consolidated drained (CD) compression triaxial tests at temperature ranges between 20 and 60 °C. For the temperature range considered in this study, a mild reduction in the effective friction angle of the two till soils of less than 1° was observed due to an increase in temperature from 20 to 60 °C. All the results were carefully assessed in view of the intrinsic soil behavior and fabric, and existing trends are highlighted. The findings of this study provide valuable insights into the shearing properties of till deposits, and can contribute to the enhancement of existing soil constitutive models as well as the development of new models that are particularly suited to the behavior of glacial tills under elevated temperatures.
Highlights
Deposits from Northern Germany.Glacial deposits are important for soil mechanics and geotechnical engineers working with soil deposits in areas of northern Europe, North American and northern Asia, because large portions of these areas were historically covered with ice, which led to the formation of various till deposits
The research presented in this paper focuses on providing new information on the experimental temperature-dependent shear strength and yielding behavior of two glacial till soils from northern Germany to supplement the existing body of work on the geomechanical behavior of till deposits
The experimental results of the consolidated drained (CD) triaxial tests on the two glacial tills are presented
Summary
Glacial deposits are important for soil mechanics and geotechnical engineers working with soil deposits in areas of northern Europe, North American and northern Asia, because large portions of these areas were historically covered with ice, which led to the formation of various till deposits. The sedimentary glacial deposits generally show a wide range of variations, from weak plastic clay tills to highly dense non-plastic tills. This high degree of variation is accredited to factors such as variations in the composing minerals, the modes by which the minerals were integrated in the ice, and by their modes of transportation and deposition, etc. Existing work on the shear strength properties, and in particular the effect of temperature, on the behavior of glacial till deposits is limited, despite the large areas covered by such deposits
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