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Scour effects on lateral behavior of pile groups in sands

机译：灌浆效应桩桩侧面的横向行为

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摘要

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.
机译：擦除在支持桥梁和海洋结构的基础周围的土壤是结构失败的主要原因。最近，已经进行了许多研究以研究使用数值分析，实验室模型测试或离心机测试对单桩的横向行为进行擦洗效应。然而，非常有限的研究专注于桩基的侧向行为的冲刷效应。目前没有简单的方法目前可用于练习工程师在洗涤条件下分析桩群。在该研究中，基于现有的P-Y曲线理论提出了一种简单实用的方法，以便于在冲刷条件下设计横向装载的桩基。通过改变冲泡孔尺寸，土壤特性和绒型组配置，通过一系列参数研究来检查所提出的方法的可行性。结果表明，该方法通常用3D FE分析产生令人愉快的结果。粒子诱导的侧侧容量损失粒度损失10-13％，致密砂体比松散的砂脂更多。在等效的冲刷条件下，桩基比单桩更容易冲刷。具有较小桩间距和较大桩数的桩基表现出由于冲刷而较少的横向容量损失。

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