锥形桩的荷载-位移特性:理论建模与分析

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.26.1.001
Yunong Li, Wei Li
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引用次数: 1

摘要

本文提出了单桩和群桩在静轴压荷载作用下的荷载-位移响应的简化分析方法。锥形桩轴在初始阶段的响应考虑为弹性响应,而沿桩-土界面滑移引起的应力增加则采用基于k0 -基各向异性修正Cam-clay (K0-AMCC)模型的不排水柱腔扩展解来计算。开发了一种有效的迭代计算程序来计算单桩的荷载-位移特性。针对锥度桩群的响应分析,采用有限差分法计算锥度桩身之间的相互作用,采用线弹性模型模拟锥度桩身与锥度桩身之间的相互作用。在桩身相互作用分析中引入折减系数,以阐明锥形桩间的加固作用。据此,提出了不同承台刚度下群桩沉降计算方法。采用两种三维有限元程序对单桩和群桩的计算方法进行了验证,对比结果表明,采用本文提出的方法可以做出合理的预测。参数化研究探讨了锥角、土体各向异性、桩间距和桩数对单桩和群桩荷载-位移特性的影响。
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Load-displacement behaviour of tapered piles: Theoretical modelling and analysis
This paper presents a simplified analytical approach for evaluating the load-displacement response of single tapered pile and pile groups under static axial compressive loads. The response of the tapered pile shaft is considered elastically in the initial stage, whereas the increase in stresses due to slippage along the pile-soil interface is obtained from a developed undrained cylindrical cavity expansion solution based on the K0-based anisotropic modified Cam-clay (K0-AMCC) model. An effective iterative computer program is developed to calculate the load-displacement behaviour of a single tapered pile. Regarding the response analysis of tapered pile groups, a finite-difference method is employed to calculate the interaction between tapered pile shaft, and the linear elastic model to simulate the interaction developed at the pile base. A reduction coefficient is introduced into the analysis of pile shaft interaction to clarify the reinforcing effect between tapered piles. Therefore, the settlement calculation methods of pile groups are proposed for different pile cap stiffness. The calculation methods of single tapered pile and pile groups are validated using two 3D Finite Element (FE) programs, and the comparison results show that reasonable predictions can be made using the method proposed in this paper. Parametric studies are conducted to investigate the effects of taper angle, soil anisotropy, pile spacing, and pile number on the load-displacement behaviour of single tapered pile and tapered pile groups.
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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