Adoptability of Double Hardening Constitutive Model for Compacted Decomposed Granite Soil

The nature of stress path dependency, the principle that governs deformations in compacted decomposed granite soil, and the use of Lade's double work-hardening model for predicting soil response for a variety of stress paths have been investigated, and are examined. The test results and the analyses presented show that under some conditions compacted decomposed granite soil exhibit stress path dependent behavior. nine simple stress paths and two complex stress paths are tested using conventional triaxial compression test. The axial strains calculated from Lade's double work-hardening model are in reasonable agreement with those measured, and the volume strain agrees very well althrough high stress level is slightly underestimated. It is known that stress behavior under constant stress level is only occured elastic strain. In reality, however, plastic strain is occured. For stress paths involving unloading or reloading, the stress path with the higher average stress level produces the larger strains, whereas all stress paths having the same intial states of stress, and involving only primary loading conditions, produce strains of similar magnitudes.