Modelling soil distortion during compaction for cylindrical stress load paths

Autor: C. T. Petersen
Rok vydání: 1994
Předmět:
Zdroj: European Journal of Soil Science. 45:117-126
ISSN: 1365-2389
1351-0754
DOI: 10.1111/j.1365-2389.1994.tb00492.x
Popis: Summary A slightly modified critical-state model was formulated in order to account for the volume-change behaviour at yield and failure observed in triaxial tests on unsaturated soils. Model parameters were specified for two soils (a sandy loam and a loam), each at three different soil-moisture contents. Maximum shear strain was integrated numerically for 36 cylindrical load paths with constant confining pressure (type I) or constant mean normal stress (type II). Predicted stress-strain relationships for load paths bringing soils from a normally-consolidated to a critical state were compared with stress-strain relationships observed for identical load paths in triaxial tests of the lubricated ends variety. The agreement between predicted and observed maximum shear strain depended on type of load path and soil-moisture content. The model failed to predict maximum shear strain at stress states close to critical. The absolute difference between observed and predicted strain was on average ≤0.05 for deviatoric stresses smaller than 90% of the critical-state values. The comparable maximum differences were 0.11 and 0.07 for load-path types I and II, respectively. The largest differences were found for the largest soil-moisture contents. The type of load path had a considerable effect on sample distortion, type I giving rise to larger (predicted and observed) maximum shear strain at common stress states.
Databáze: OpenAIRE
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