Analysis on viscoelastic consolidation of soil around permeable pipe pile after pile driving
An axisymmetric consolidation model of soil around a permeable pipe pile after driving is established,where the stress-strain relationship of the soil is simulated with the Merchant viscoelastic constitutive model,the permeability of the pile-soil interface is described as a semi-semi-permeable boundary.The corresponding analytical solutions for the excess pore water pressure and consolidation degree of the soil are derived using the separation of variables and Laplace transform.Then,the rationality of present solutions is verified by comparing them with the existing solutions.Based on the present solutions,the parametric analyses are carried out to in-depth investigate the consolidation characteristics of the soil around a permeable pipe pile.The results show that a larger boundary parameter of the semi-permeable boundary results in a quicker consolidation of the soil around the pile,and leads to a smaller effect of the soil viscoelasticity on the consolidation rate of the soil;in the early stages,the effect of soil viscoelasticity on the consolidation behavior of the soil around the pile is not significant,while in the later stages,the greater the viscosity coefficient of the soil and the greater the modulus ratio of the independent spring to the paralleled spring in Kelvin body,the slower the consolidation rate of the soil around the pile.
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