Improved Fictitious Soil Pile Model for Simulating the Base Soil Under the High-Strain Condition

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Chengjun Guan, Minjie Wen, Yiming Zhang, Pan Ding, Menghuan Chen, Haofeng Dai, Qingping Yang, Yuan Tu
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引用次数: 0

Abstract

The dynamic pile-soil interaction significantly affects the accuracy of pile vibration response analysis. However, currently, there is no well-established method for simulating pile toe soil under high-strain dynamic loading (HSDL), which presents a major challenge for pile driving analysis. This paper proposes a fictitious soil pile model to simulate reactions and stress wave propagation in the base soil under HSDL. The pile toe soil was regarded as a fictitious soil pile extending downward to the bedrock at a certain cone angle, considering the non-linear soil stiffness, radiation damping, and hysteretic damping. The solution of the soil responses was given by differential iterative method combined with MTLAB programming. The model's accuracy was validated against a three-dimensional (3D) finite element model and the Smith model. Sensitivity analysis was performed on parameters such as discreteness, time interval, cone angle, and non-linear stiffness. The model shows advantages in simulating stress wave propagation in pile toe soil under HSDL, with attenuation rates decreasing with depth and wave speeds stabilizing after an initial decrease. The soil elastic modulus, pile diameter, cone angle, and impact loads influence the attenuation rate, while only the elastic modulus significantly affects wave speed. The results could be helpful for the simulation of the pile toe soil under HSDL and the study of the attenuation of stress waves in the soil.

高应变条件下模拟地基土的改进虚拟桩模型
桩土动力相互作用对桩振动响应分析的准确性有重要影响。然而,目前还没有很好的方法来模拟高应变动荷载(HSDL)下的桩趾土,这对桩身分析提出了重大挑战。本文提出了一种虚拟土桩模型,用于模拟高速公路荷载作用下地基土的反作用力和应力波传播。考虑土体的非线性刚度、辐射阻尼和滞回阻尼,将桩脚土视为沿一定锥角向下延伸至基岩的虚拟土桩。采用微分迭代法结合MTLAB规划给出了土体响应的解。通过三维有限元模型和Smith模型验证了该模型的准确性。对离散度、时间间隔、锥角和非线性刚度等参数进行敏感性分析。该模型具有较好的模拟应力波在HSDL作用下桩尖土中的传播效果,衰减速率随深度的增加而减小,波速在初始减小后趋于稳定。土弹性模量、桩径、锥角和冲击荷载对衰减速率有影响,只有弹性模量对波速有显著影响。研究结果可为高强度荷载作用下桩尖土的模拟及应力波在土中的衰减研究提供参考。
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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