A novel soil-pile interaction model for vertical pile settlement prediction

Self Cite

Taking both pile end stress diffusion effect and pile-soil interface softening effect into account, a new nonlinear method for the vertical settlement of pile is proposed in this paper. In detail, a new model, namely stress bubble fictitious soil pile model, is proposed to simulate the support from the pile bottom soil. The nonlinear soil softening model is introduced to establish the relationship between unit pile shaft friction and pile-soil relative displacement. Then, a nonlinear calculation method for load-settlement analysis in multilayered soil is developed with the integration of these two models. The validity and accuracy of the proposed method are verified through the comparisons against experimental and existing simplified methods. At last, a detailed parametric study is conducted to assess the influence of the parameters related to the proposed model and pile-soil system on the load-displacement behavior of single pile. The promotion of this method could hugely boost the prediction of the single pile settlement for the preliminary design of pile foundation in layered soil.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear analysis of single pile settlement based on stress bubble fictitious soil pile model

Wang

Zhang

et al. 2022

Self Cite

“…6,7 Considering the variety and universality of the types of structure foundations used in actual soil, a series of theory on the dynamic response of a circular foundation (especially for the case of pile foundations, bridge piers, and gravity foundations) has received much attention. 8,9 For example, Zhang et al 10,11 established a precise pile-soil interaction model subjected to torsional dynamic load, where the continuum theory considering three-dimensional wave propagation was used to obtain the apparent wave velocity of piles. Based on the additional mass model associated with axi-symmetric condition, Liu et al 12 made an analytical approach to evaluate the detection problem of pipe piles for facilitating the interpretation of signal spectrums.…”

Section: Introductionmentioning

confidence: 99%

Horizontal motions of a rigid disk placed on a poroelastic soil layer of finite thickness

Yang

2023

In the previous studies of rigid disk-soil dynamics, the soil under the foundation is usually treated as a poroelastic half-space medium. However, the waves due to the vibration of rigid disk can reflect and refract back and forth between the finite soil layer and rigid bedrock, which would significantly influence the soil deformation and flow of the rigid disk-soil system. In order to overcome the shortcoming, this paper presents an analytical solution to determine the response of the rigid disk subjected to harmonic horizontal loads resting on poroelastic soil layer overlying rigid bedrock. The displacements and stresses field of the disk and soil are obtained by virtue of the Hankel transform method, dual integral equations method. Furthermore, the rationality and accuracy of the developed solution are confirmed in comparison with the previous studies. Based on the obtained solutions, numerical examples are performed to the effects of the thickness and permeability of poroelastic soil layer on the dynamic response of the rigid disk-soil system in the physical domain.

“…However the calculation accuracy of the existing studies can hardly satisfy the urgent engineering requirements. The nature of the AWVP problem is the dynamic pile-soil interaction, whereas the AWVP predicted by the commonly used dynamic Winkler model, [20][21][22] plane strain model, 23,24 simplified continuum model, 25,26 and rigorous continuum model 27,28 are basically equal to the material longitudinal wave velocity of the pile, which significantly diverges from the real condition. This may be attributed to the following two shortcomings of the existing soil-pile models.…”

Section: Introductionmentioning

confidence: 99%

Apparent wave velocity inverse analysis method and its application in dynamic pile testing

Hao

Yang

et al. 2022

Self Cite

This study proposes a new non-destructive testing method (NDT), namely the apparent wave velocity of piles (AWVP) inverse analysis method, to solve the detection problem of the gradually varying cross-sectional defects (cracks or necking) and the material property defects (concrete disintegration or steel corrosion) of piles. The analytical solution of the AWVP has been derived based on the additional mass model. The rationality and accuracy of the theoretical model have been validated through the comparisons with the experiment results. The variation mechanism of the AWVP due to the presence of soil has been clarified. A parametric study is conducted to investigate the major factors to determine the variation tendency of the AWVP. The optimum working conditions and parameter combinations of the AWVP based NDT method have been recommend. The main conclusions can be drawn as: (1) the variation of the AWVP with respect to frequency can be generally divided into a sensitive zone and a stable zone.(2) The AWVP initially decreases rapidly with the frequency within the sensitive zone, however when the frequency decreases to the stable zone, this decline tendency becomes much smaller. (3) Although the AWVP varies extensively within the frequency sensitive zone, this frequency range can substantially relax the requirements for the parametric accuracy of the pile-soil system.