Model for large strain consolidation with non‐Darcian flow described by a flow exponent and threshold gradient

Abstract

Summary Many pieces of evidence have confirmed that the seepage in fine‐grained soils can deviate from traditional Darcy's law that contributes to the consolidation theory. In this paper, a numerical model, referred to as consolidation with non‐Darcian flow 2 (CNDF2), is developed for the 1D large strain consolidation of a saturated porous medium with the non‐Darcian flow. The algorithm accounts for vertical strain, general constitutive relationships, the relative velocity of the fluid and solid phases, variable compressibility and permeability relation during consolidation, time‐dependent loading, and unload/reload effects. Compared with the CS2 model proposed in previous studies, some parts of the CNDF2 model are modified in order to adapt to the non‐Darcian flow, especially the equivalent series hydraulic conductivity and fluid flow. The verification examples of the CNDF2 model demonstrate excellent accuracy for both small strain and large strain consolidation. According to the applicable conditions of non‐Darcian flow law, the CNDF2 model is most suitable for the fine‐grained soil. The development of CNDF2 is first presented, followed by examples to analyze the influences of the non‐Darcian flow on the consolidation behavior.

A general analytical solution for axisymmetric electro‐osmotic consolidation of unsaturated soil with semi‐permeable boundary

“…However, the above literature focuses on the electro‐osmosis consolidation in saturated soil. The majority of the Earth's surface consists of unsaturated soil, with saturated soil 17 being a rare occurrence when the degree of saturation is 100% 18 . Saturated soil can be only considered as an exceptional example within the broader category of unsaturated soil.…”

Consolidation Attributes and Deformation Response of Soft Clay Reinforced with Vertical Scoria Drains under Road Embankment

“…With the rapid consolidation process, soft soils gain shear strength rapidly which allows for a faster pace of construction works. Tis signifcantly increases the long-term stability of the structures built on clayey ground as the potential consolidation settlements are accomplished mostly before or during the construction phase [14][15][16][17][18][19][20][21][22][23][24].…”

One‐dimensional nonlinear creep consolidation of soft soils with time‐dependent drainage boundary under construction load

“…33 He 33 also proposed an NDF rule in segmentation function form and found that the calculated results matched better with the field observations by applying the flow relations to consolidation. The kinds of literature [34][35][36][37][38] have introduced this flow rule into the analysis of 1D consolidation, or sand-drained ground consolidation, and concluded that Hansbo's flow rule has a delaying effect on consolidation. However, Hansbo's flow rule is expressed by a piecewise function, and the parameters are complicated to determine.…”