THE INFLUENCE OF ANISOTROPIC STIFFNESS ON THE CONSOLIDATION OF PEAT

[摘要] References(21)An analytical solution for the consolidation problem of an axially loaded triaxial sample including anisotropy in stiffness is presented. The solution shows that anisotropy in stiffness strongly influences the consolidation process. The influence of anisotropy in stiffness is found in the initial pore pressure reaction, in the Mandel-Cryer effect and in the consolidation coefficient. Measurements on conventional sized peat samples appear not to correspond to the analytical solution. Besides drain resistance, literature presents two other explanations for this fact. These explanations are tested in a large scale test set-up. It is found that induced permeability changes have a strong influence. The possibility of using the Mandel-Cryer effect for assessment of stiffness parameters of peat introduces extra parameters to describe the variations in permeability. For strongly over-consolidated samples, leading to a nearly constant permeability the analytical solution fits perfectly to measurements.

[学科分类] 建筑学

[关键词] anisotropy;elasticity;laboratory test;organic soil;pore pressure (IGC:D5)