Study on lateral behavior of digging well foundation with consideration of soil-foundation interaction

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.24.1.015
W. Yi, Xingchong Chen, Xiyin Zhang, M. Ding, Jinhua Lu, Hua Ma
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引用次数: 1

Abstract

Digging well foundation has been widely used in railway bridges due to its good economy and reliability. In other instances, bridges with digging well foundation still have damage risks during earthquakes. However, there is still a lack of knowledge of lateral behavior of digging well foundation considering the soil-foundation interaction. In this study, scaled models of bridge pier-digging well foundation system are constructed for quasi-static test to investigate their lateral behaviors. The failure mechanism and responses of the soil-foundation-pier interaction system are analyzed. The testing results indicate that the digging foundations tend to rotate as a rigid body under cyclic lateral load. Moreover, the depth-width ratio of digging well foundation has a significant influence on the failure mode of the interaction system, especially on the distribution of foundation displacement and the failure of pier. The energy dissipation capacity of the interaction system is discussed by using index of the equivalent viscous damping ratio. The damping varies with the depth-width ratio changing. The equivalent stiffness of soil-digging well foundation-pier interaction system decreases with the increase of loading displacement in a nonlinear manner. The absolute values of the interaction system stiffness are significantly influenced by the depth-width ratio of the foundation.
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考虑地基-地基相互作用的挖井基础横向性能研究
挖井基础以其良好的经济性和可靠性在铁路桥梁中得到了广泛的应用。在其他情况下,具有良好基础的桥梁在地震中仍然存在损坏风险。然而,考虑地基-地基相互作用的挖井基础横向行为研究仍然缺乏。本文建立了桥梁桥墩-挖井基础体系的比例模型,进行了准静力试验,研究了其横向特性。分析了地基-桥墩相互作用体系的破坏机理和响应。试验结果表明,在循环横向荷载作用下,基坑基础呈刚体旋转趋势。此外,挖井基础的深宽比对相互作用体系的破坏模式有显著影响,特别是对基础位移分布和桥墩破坏有显著影响。利用等效粘性阻尼比指标讨论了相互作用系统的耗能能力。阻尼随深宽比的变化而变化。土-挖井-基础-墩相互作用体系的等效刚度随荷载位移的增加呈非线性减小。基础的深宽比对相互作用体系刚度的绝对值有显著影响。
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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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