Analysis of the Behavior Characteristics of Pile Foundations Responding to Ground Deformation

IF 0.4 Q4 ENGINEERING, GEOLOGICAL Journal of the Korean Geosynthetic Society Pub Date : 2020-12-01 DOI:10.12814/JKGSS.2020.19.4.021
Junwon Lee, S. Shin, Hak-Sool Lee, Dongwook Kim, Kicheol Lee
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引用次数: 1

Abstract

As the global large-scale infrastructure construction market expands, the construction of civil engineering structures in extreme environments such as cold or hot regions is being planned or constructed. Accordingly, the construction of the pile foundation is essential to secure the bearing capacity of the upper structure, but there is a concern about loss of stability and function of the pile foundation due to the possibility of ground deformation in extreme cold and hot regions. Therefore, in this study, a new type of pile foundation is developed to respond with the deformation of the ground, and the ground deformation that can occur in extreme cold and hot region is largely divided into heaving and settlement. The new type of pile foundation is a form in which a cylinder capable of shrinkage and expansion is inserted inside the steel pipe pile, and the effect of the cylinder during the heaving and settlement process was analyzed numerically. As a result of the numerical analysis, the ground heaving caused excessive tensile stress of the pile, and the expansion condition of the cylinder shared the tensile stress acting on the pile and reduced the axial stress acting on the pile. Ground settlement increased the compressive stress of the pile due to the occurrence of negative skin friction. The cylinder must be positioned below the neutral point and behave in shrinkage for optimum efficiency. However, the amount and location of shrinkage and expansion of cylinder must comply with the allowable displacement range of the upper structure. It is judged that the design needs to be considered.
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桩基对地基变形的响应特性分析
随着全球大型基础设施建设市场的扩大,在寒冷或炎热地区等极端环境下的土木工程结构建设正在规划或建设中。因此,桩基础的施工对保证上部结构的承载能力至关重要,但在极寒、极热地区,由于地面可能发生变形,使桩基础失去稳定性和功能。因此,在本研究中,开发了一种新型的桩基础来响应地面的变形,在极寒、极热地区可能发生的地面变形在很大程度上分为隆起和沉降。新型桩基础是在钢管桩内插入可伸缩筒体的形式,并对筒体在钢管桩的沉升过程中的作用进行了数值分析。数值分析结果表明,地面隆起引起桩的拉应力过大,筒体的膨胀条件分担了作用在桩上的拉应力,减小了作用在桩上的轴向应力。地基沉降由于负摩阻的发生,使桩的压应力增大。气缸必须位于中性点以下,并表现出最佳的收缩效率。但筒体缩胀量和位置必须符合上部结构的允许位移范围。判断该设计需要考虑。
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