Straight pile vertical impedance calculation method
A calculation method and technology of straight piles, applied in calculation, special data processing applications, instruments, etc., can solve the problem of inability to consider layered soil saturation multiphase radial heterogeneity, and inability to accurately describe the stress-strain relationship of soil, etc. question
Pending Publication Date: 2019-12-20
HOHAI UNIV
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a calculation method for the vertical impedance of straight piles, which can solve the problem that the existing vertical impedance calculation method cannot accurately describe the stress-strain relationship of the soil. It is impossible to consider the saturated heterogeneity of layered soil and the radial heterogeneity caused by construction disturbance, so as to improve the calculation accuracy of vertical impedance of straight piles
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[0127] In this embodiment, the pile foundation is embedded in a saturated viscoelastic half-space covered with 2m thick hard soil. The parameters of the pile foundation are as follows: pile length L=10m, pile body radius r 0 =0.5m, the Poisson's ratio of the pile body μ=0.2, the material damping of the pile body c=1×10 5 Ns / m 2 , the modulus of elasticity of the pile E=3.24×10 10 Pa. Unless otherwise specified, the parameters of saturated soil are as follows: soil density ρ S =1800kg / m 3 , Poisson's ratio μ of soil S =0.4, fluid volume fraction n in saturated soil L =0.4, permeability coefficient k D =1×10 -3 m / s, the parameters of the fractional derivative constitutive model describing the soil stress-strain relationship are all set as α=0.5, τ ε = 1s and τ σ = 3s. Due to the influence of construction disturbance, there is a disturbance zone with the same width as the radius of the pile body in the soil around the pile, and the shear wave velocity of the soil in th...
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The invention discloses a straight pile vertical impedance calculation method, which comprises the following steps: vertically dispersing a pile body of the straight pile and foundation soil accordingto the horizontal layering condition of a soil body, and dispersing the foundation soil in the radial direction according to the disturbance condition of soil around the pile; solving a wave equationof each soil ring layer and calculating the dynamic stiffness on the pile-soil contact surface through a radial transfer matrix method; and calculating the vertical impedance of the straight pile through a vertical transfer matrix method after solving the equation. The straight pile vertical impedance calculation method has the advantages that the vertical impedance of the straight pile under theradial heterogeneous condition of saturated soil around the pile caused by the construction disturbance effect in the layered foundation is calculated and considered; radial heterogeneity of layeredsaturated soil under a construction disturbance effect is considered through a bidirectional transfer matrix method, and meanwhile, a fractional derivative operator is adopted to describe a stress-strain relationship of foundation soil so as to improve calculation precision; and a Rayleigh rod vibration theory is adopted to describe vertical vibration of a pile body so as to consider a transverseinertia effect of pile body vibration. By means of the straight pile vertical impedance calculation method, the calculated vertical impedance of the straight pile better conforms to engineering practice.
Description
technical field [0001] The invention relates to a method for calculating vertical impedance of straight piles, in particular to a method for calculating vertical impedance of straight piles in disturbed layered saturated soil described by fractional derivatives. Background technique [0002] Straight piles are widely used as the supporting foundation of bridge engineering, offshore engineering, high-rise buildings and other structures because of their advantages of high bearing capacity and small settlement. Under the action of dynamic loads such as crowds, machinery, and waves, there is a dynamic interaction between the soil and the straight piles, which in turn changes the dynamic characteristics of the superstructure. Therefore, when the superstructure is a towering dynamic sensitive structure with concentrated mass at the top, it is necessary to consider the influence of the dynamic interaction between soil and straight piles on the dynamic characteristics of the superst...
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Inventor 王珏高玉峰
Owner HOHAI UNIV
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