| ATTRIBUTE | VALUE |
|---|
| type | A |
| database id | 5264 |
| title | Elasto-plastic interpretation of oedometric test |
| authors | Sawicki A.1 |
| affiliations | |
| pages | 111 — 131 |
| full text link | http://www.ibwpan.gda.pl/storage/app/media/ahem/ahem41no12str111.pdf |
| abstracts | The paper deals with a new interpretation of oedometric tests that is based on the elasto-plastic approach including such phenomena as compaction and dilation. The analysis starts with a presentation of empirical results obtained from oedometric tests performed on sands with additional measurement of lateral stresses. Three types of sand response were identified during a single cycle of loading and subsequent unloading. During the loading, both reversible and irreversible strains develop in the soil sample. During the unloading one can distinguish two phases. The first one is characterized by a purely elastic response. A characteristic feature of this phase is that the sand deformation takes place in the vertical direction only. The horizontal elastic strain remains constant during the first phase of unloading, and is opposite to the permanent horizontal strain that has developed during the loading (the total lateral strain is zero in oedometric conditions). It is shown that the reversible response of the sand sample obeys the Hooke's linear law for practically important stress levels. The second stage of unloading is characterized by elastic and irreversible (dilation) responses. During that phase the stress deviator remains constant and only the mean pressure is reduced. The second stage of unloading begins when the Failure in Extension Line is attained in the stress space. Elastic constants are determined from the analysis of the first phase of unloading, which is different from the methods of determination of elastic moduli commonly accepted in soil mechanics. A respective discussion on this problem is also presented. The assumption concerning a linear reversible response allows for the extraction of irreversible strains from experimental data. Subsequently the law of compaction is proposed in order to describe irreversible strains developed during the loading. The phenomena of dilation during the second phase of unloading and the "compaction induced lateral stresses" are also discussed in the light of the approach proposed in this paper. Some useful practical formulae enabling a simple analysis of oedometric tests are derived. The general conclusion which follows from the considerations presented in this paper is that the classical oedometric test, with additional measurement of lateral stresses, is a powerful experimental method in soil mechanics investigations. |
| attributes | [reviewed] [scientific] |
| language | en |
| points | 6 |
| PART OF |
|---|
| type | C |
| database id | 5265 |
| year | 1994 |
| series | Archives of Hydro-Engineering and Environmental Mechanics |
| issue | Vol. 41, No. 1-2 |
| publisher | Wydawnictwo IBW PAN |
| place | Gdańsk |