Abstract
The permeability coefficient and void ratio are related to the stress state of the soil, which manifests as the temporal and spatial variability of consolidation. Based on the modified Cambridge model, this paper quotes the functional relationship between the soil permeability coefficient and void ratio and soil stress obtained by Tylor’s research and then uses finite-element software ABAQUS and its secondary development platform to establish a plastic drainage plate surcharge preloading numerical model that considers the influence of the void ratio and permeability coefficient with stress changes. The results show that considering the variability of the permeability coefficient in the consolidation process of the soft foundation has a great influence on the change of the consolidation state but has a small effect on the final consolidation state. For soft foundation surcharge preloading reinforcement treatment, if the strength of the soft foundation is low but the surcharge is large, the geometric nonlinearity and material nonlinearity should be considered. Using the theory of large deformation consolidation to calculate the consolidation of soil is closer to the actual situation.
Highlights
Soft clay deposited by marine, lacustrine, and river facies is widely distributed along the coast and inland in China. is kind of soil is characterized by high compressibility, low strength, high water content, and poor water permeability
As an important member of foundation reinforcement technology, it is mainly used to treat silt or silt soil, flush fill, and saturated cohesive soil. e drainage plate preloading method is an effective soft foundation reinforcement method developed on the basis of the traditional sand well drainage preloading method
An ordinary B-type plastic drainage plate is used as the vertical drainage channel, arranged in a regular triangle, with a distance of 1.2 m. e plastic drainage plate has a cross-sectional width of 100 ± 2 mm, a thickness of 4.0 mm, longitudinal water flow, and a membrane permeability coefficient of ≥5 × 10−4 m/s. e plastic drainage plate is required to pass through the silty soft soil layer and the weak underlying layer into the sand layer about 1.0 m
Summary
Soft clay deposited by marine, lacustrine, and river facies is widely distributed along the coast and inland in China. is kind of soil is characterized by high compressibility, low strength, high water content, and poor water permeability. Poskitt [9] elaborated on the Gibson theory and considered the linear changes of soil compressibility and permeability during the consolidation process, using the perturbation method to obtain an analytical solution to the one-dimensional largestrain consolidation equation. On the basis of Gibson’s one-dimensional large-strain theory and Barron’s free strain theory, Geng and Yu [12] present a governing equation which considers the radial and vertical flows, the weight of the soil, time-dependent surcharge, and vacuum preloading, along with variable hydraulic conductivity and compressibility during consolidation. This article uses finiteelement software ABAQUS to perform a numerical simulation study on the soft foundation treatment of a plastic drainage plate with surcharge pressure considering the variability of the permeability coefficient and large deformation consolidation. The results are used to analyze the consolidation settlement of the soft foundation reinforced by the preloading of the drainage plate by the numerical simulation method’s practicality and effectiveness in forecasting
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