Abstract
To investigate the characteristics of the non-Darcian water flow through saturated clay and one-dimensional rheological consolidation behaviors of the soil in the Henan Province, we conducted constant-head permeability and one-dimensional rheological consolidation tests with one-way drainage using improved permeameter and oedometer tests, respectively. We then used Hansbo’s flow equation to classify the permeability test results and one-dimensional rheological consolidation equation combined with unified hardening (UH) constitutive model considering time effect was introduced to simulate the oedometer test results. The obtained results showed that the improved constant-head permeability test device was suitable for saturated clays, and that the UH constitutive model and Hansbo’s flow equation had good applications for the saturated clays investigated in this experiment.
Highlights
Terzaghi’s [1] one-dimensional consolidation theory has been widely employed by researchers since its introduction
In areas with saturated clay, researchers have found that settlement values predicted by Terzaghi’s theory have large deviations from measured values, mainly because this theory ignores the influence of non-Darcian flow of pore water seepage and the rheological properties of saturated clays
As early as 1898, King [2] found a deviation from Darcy flow in saturated clays, which was unrecognized by the academic community at the time
Summary
Terzaghi’s [1] one-dimensional consolidation theory has been widely employed by researchers since its introduction. The non-Darcian flow phenomenon in saturated clays was subsequently confirmed by many researchers around the world, and different mathematical equations were proposed for it. Consolidations, as well as sand drains [17], further confirming the necessity of considering non-Darcian flow in the analysis of saturated clay consolidation. All these previous studies related to clay consolidation mostly focused on non-linearity [18,19], anisotropy [20], large-strain [21], time-dependent loading [22], and so on, while relatively few studies are related to the rheological properties of clay. A series of permeability and rheological consolidation tests were carried out, and their results were compared with fitting results obtained from Hansbo’s flow model and theoretical prediction results from the UH rheological consolidation model in order to verify the applicability of both models to saturated clay
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