Some remarks on the coefficient of earth pressure at rest in compacted sandy gravel |
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| Authors: | S Lirer A Flora M V Nicotera |
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| Institution: | (1) Department of Hydraulic, Geotechnical and Environmental Engineering, University of Napoli Federico II, Naples, Italy |
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| Abstract: | In compacted coarse-grained materials, the stress state is largely influenced by the compaction procedure and by the characteristics
of the single grains (mineralogy, shape). In this work, two compacted sandy gravels with the same grading but different grain
properties have been tested in a large soft oedometer to highlight this influence. In the first part of the paper, the effect
of oedometric ring deformability on the stress state is quantified in the framework of elastoplasticity. It is then shown
that, for the adopted apparatus and for the tests carried out, the error in the measurement of the coefficient of earth pressure
at rest K
0 caused by ring deformability is very small. The two tested materials, compacted by wet tamping, behave differently because
of their different grain properties, showing, respectively, small and large grain breakage. In primary loading, the more crushable
material has values of K
0 that compare well with Jaky’s (J Soc Hungarian Archit Eng 355–358, 1944) equation at any stress level and for every tested
soil density. For the material with stronger grains, only very loose specimens that have undergone little or no compaction
have a similar behaviour, while the denser specimens show the typical behaviour of overconsolidated soils, with values of
K
0 initially larger than that suggested by Jaky (J Soc Hungarian Archit Eng 355–358, 1944) for normally consolidated soils,
tending to it only at the largest applied stress values. By considering the complex combined effect of tamping and grain crushing
on the stress state and on the overconsolidation ratio of the soil at the end of compaction, these experimental evidences
have been qualitatively explained. |
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