有効応力からみた粘性土のクリープ現象

Abstract

Two series of drained creep tests on saturated remolded clay, a series on the nor-mally consolidated state (σc = 2kg/cm2) and other reries on the over-consolidated state(0. C. R=5. 6), were performed. The water content of both series after consolidationwas controled to be equal. And possible change of water content during creep durationto be minimum, creep stress condition of each specimen was to come a point on thevector curve which was obtained from undrained strain controled triaxial compressiontest of another specimen subjected to corresponding consolidation. Creep stress wasapplied about one week under 20℃ of room temperature.Test results are as follows:I) Linear relationship between creep-strain, ε, and loading time in logalismic scale, logτ was not obtained.Ii) Rate of creep, (Δε/Δlogτ), which is measured between 100 minuts and 5000 minutsof loading time is not infuluenced by (σ1'-σ3')/2 when (σ1-σ3)≦0.7kg/cm2 (about 40%of (σ1-σ3)max), iii) but it is controled by (σ1'-σ3')/2 when (σ1-σ3)>0.7kg/cm2.