Abstract Scour that removes soils around foundations supporting bridges and marine structures is the major cause for structural failures. Recently, many studies have been conducted to investigate scour effects on lateral behavior of single piles using numerical analyses, laboratory model tests, or centrifuge tests. However, very limited research is focused on scour effects on lateral behavior of pile groups. No simple method is currently available for practicing engineers to analyze pile groups under scour conditions. In this study, a simple and practical method was proposed based on the existing p-y curve theory to facilitate the design of laterally loaded pile groups under scour conditions. Feasibility of the proposed method was examined against 3D finite element (FE) analyses through a series of parametric studies by varying scour-hole dimensions, soil properties, and pile group configurations. The results showed that the proposed method generally produced agreeable results with the 3D FE analyses. Scour-induced lateral capacity loss of pile groups was 10–13% more in dense sands than in loose sands. Pile groups were more susceptible to scour than single piles under the equivalent scour conditions. A pile group with smaller pile spacing and larger pile numbers showed a less loss of lateral capacity due to scour.

中文翻译：

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冲刷对沙土中桩群横向行为的影响

摘要 去除支撑桥梁和海洋结构的基础周围土壤的冲刷是结构失效的主要原因。最近，已经进行了许多研究，以使用数值分析、实验室模型测试或离心机测试来研究冲刷对单桩横向行为的影响。然而，非常有限的研究集中在冲刷对桩组横向行为的影响。目前还没有简单的方法可供实践工程师在冲刷条件下分析桩组。本研究基于现有的py曲线理论提出了一种简单实用的方法，以方便冲刷条件下侧向荷载群桩的设计。通过改变冲刷孔尺寸、土壤特性和桩组配置的一系列参数研究，针对 3D 有限元 (FE) 分析检查了所提出方法的可行性。结果表明，所提出的方法在 3D 有限元分析中普遍产生了令人满意的结果。冲刷引起的桩组侧向承载力损失在密砂中比在松散砂中多 10-13%。在相同的冲刷条件下，桩组比单桩更容易受到冲刷。具有较小桩距和较大桩数的桩组由于冲刷而导致的侧向承载力损失较小。冲刷引起的桩组侧向承载力损失在密砂中比在松散砂中多 10-13%。在相同的冲刷条件下，桩组比单桩更容易受到冲刷。具有较小桩距和较大桩数的桩组由于冲刷而导致的横向承载力损失较小。冲刷引起的桩组侧向承载力损失在密砂中比在松散砂中多 10-13%。在相同的冲刷条件下，桩组比单桩更容易受到冲刷。具有较小桩距和较大桩数的桩组由于冲刷而导致的横向承载力损失较小。