الفهرس 
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Abstract
In static problems of soil mechanics, the rheological prop¬erties of sand are usually ignored in the analysis. However, in some special problems, e.g. capacity of driven piles, cap¬acity of prestressed anchorsetc., the rheological properties of sand may have a significant effect. Relaxation and creep phenomena take place in soils, as well as in materials, exhibiting rheological properties, i.e. time dependent stress-strain relationships. Previous inv~stigat¬ions of these phenomena in soil have been mainly devoted to clays. The subject study aims to investigate relaxation and creep phenomena in sand.
Rl?laxatiop. of stress under constant strain iiestsand creep strain under constant stress tests were performed on samples of sand in the laboratory. A sum of 98 samples were tested in confined as well as in triaxial conditions. A special apparatus for testing confined sand samples in relaxation and creep was designed and constructed. A conventional tr¬iaxial cell was used to perform three diamensional relaxa¬tion and creep tests. The testing programme was set up to investigate the stress relaxation-time and the creep strain-time relationship in confined and triaxial conditions. The effect of relative densi ty, size of sand particles, stress level and repi ti tion of stress on the investigat~d relationships for confined sand was studied. For sand in triaxial conditions, the effect of cell pressure, deviator stress and relative density was inv¬estigated.