Abstract
In geotechnical engineering, vertical drainage is the most economical method for accelerating the consolidation of a large area of soft ground. In this study, we analyze the viscoelasticity of the soil and the actual drainage conditions on the top surface of the soil, and then we introduce continuous drainage boundary conditions and adopt a fractional derivative model to describe the viscoelasticity of the soil. With the use of a viscoelasticity model, the governing partial differential equation for vertical drains under continuous drainage boundary conditions is obtained. With the application of the Crump numerical inversion method, the consolidation solution for vertical drains is also obtained. Further, the rationality of the proposed solution is verified by several examples. Moreover, some examples are provided to discuss the influence of interface drainage parameters on the top surface of soil and the viscoelasticity parameters of soil on the consolidation behavior of vertical drains. The proposed method can be applied in the fields of transport engineering to predict the consolidation settlement of a foundation reinforced by vertical drains.
Highlights
Consolidation of vertical drains is the most economical and effective method for reinforcement treatment of a large area of soft soil (Indraratna et al, 2010, 2012)
We have introduced the continuous drainage boundary conditions proposed by Mei and have derived a solution to the fractional derivative viscoelastic vertical drain consolidation problem for continuous drainage boundary conditions
This study introduces the fractional-derivative Merchant (FM) model to describe the effective stress-strain relationship in the soil
Summary
Consolidation of vertical drains is the most economical and effective method for reinforcement treatment of a large area of soft soil (Indraratna et al, 2010, 2012). The degradation solution in this study is exactly the same as that in the result obtained by Huang and Li (2019) based on the fractional derivative viscoelastic vertical drain consolidation model for the completely pervious boundary condition. This phenomenon is in a good agreement with the 1D consolidation of viscoelastic soil (Xie et al, 2008)
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