Abstract
The coefficient of consolidation is traditionally considered as a constant value in soil consolidation calculations. This paper uses compression and recompression indexes to calculate the solution-dependent nonlinear compressibility, thus overconsolidation and normal consolidation are separated during the calculations. Moreover, the complex nonlinear consolidation can be described using the nonlinear compressibility and a nonlinear permeability. Then, the finite element discrete equation with consideration of the time-dependent load is derived, and a corresponding program is developed. Subsequently, a case history is conducted for verifying the proposed method and the program. The results show that the method is sufficiently accurate, indicating the necessity of considering nonlinearity for consolidation calculations. Finally, three cases are compared to reveal the importance of separating the overconsolidation and normal consolidation. Overall, this study concluded that it is inadequate to consider just one consolidation status in calculations, and that the proposed method is more reasonable for guiding construction.
Highlights
Consolidation behavior is a complex phenomenon in clays and is of great importance to most construction activities
Using the finite element method, the discrete equation in space and time domains is of settlement, are used for evaluating the nonlinear compressibility
2.303 σ where de is the increment of void ratio, Cs is the recompression index, Cc is the compression index, where de is the increment of void ratio, Cs is the recompression index, Cc is the compression index, and and dσ′ is the increment of effective stress
Summary
Consolidation behavior is a complex phenomenon in clays and is of great importance to most construction activities. The coefficient of consolidation used in calculation is usually considered as a constant value in aforementioned studies (i.e., a constant ratio of permeability to compressibility), and such a simplification may not be reasonable in some situations. The coefficient of consolidation used in calculation is usually considered as a constant available about the solution-dependent behavior of the compressibility, which significantly affects value in aforementioned studies (i.e., a constant ratio of permeability to compressibility), and such the coefficient of consolidation. Using the finite element method, the discrete equation in space and time domains is of settlement, are used for evaluating the nonlinear compressibility. Using the finite element method, the discrete equation in space and time domains is derived and the significance of the separation of overconsolidation and normal consolidation are conducted corresponding program with consideration of the time-dependent load is developed. For verifying the proposed method and three comparative cases for proving the significance of the separation of overconsolidation and normal consolidation are conducted subsequently
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