Abstract
Most of the observations in literature so far discussed on time effects had focused on the determination of time-dependent behavior of natural soils, whereas the reported experimental studies of embankment soils are few. Therefore, with an aim to clarify the behaviour of embankment soils with time, sampling of the undisturbed soil was made from about a 40-year old highway embankment. Unconfined compression tests, consolidated undrained (CU) triaxial compression tests with small strain cyclic loading and bender element tests were performed for determining small strain Young’s modulus (E) and shear modulus (G). These mechanical properties were compared with the remolded fresh and undisturbed specimens. Besides undisturbed and remolded fresh specimens, some specimens were also allowed to age in a mold under a constant overburden stress of 50 kPa in a specially designed consolidometer to observe the change in the mechanical properties within relatively short period up to a few weeks. The outcome of the research revealed that the strength and stiffness of embankment soils also increase with time.
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