Finite Element Analysis of One Dimention Large Strain Consolidation of Clays with Variable Compressibility and Permeability

摘要

The coefficient of compressibility a_v and the coefficient of permeability k_v of clays decrease during the one dimention consolidation process, especially when the strain of clays in the process are large. This paper studies the effects of large strain, decreasing compressibility and decreasing permeability during the one dimention large strain consolidation process by analyzing results obtained from the nonlinear finite element method and comparing with results from the conventional consolidation theory. The research results of this paper shows that the compression index C_c and the permeability change index C_k are two important clay parameters which influence one dimention large strain consolidation process. When the instantaneous load increment remains unchanged, the larger the value of the C_c, the larger the value of the final settlement and the slower the settlement development; the larger the value of the C_k, the faster the dissipation of excess pore water pressure in one dimention large strain consolidation process.